CN117231180B - Sand blasting perforation device and ultra-short radius horizontal well completion method - Google Patents

Abstract

The application provides a sand blasting perforation device and an ultra-short radius horizontal well completion method, and relates to the field of oil well exploitation. The sand blasting perforation device comprises: a spout assembly, a dual tightening adjustment assembly, and a spray assembly. Because the threaded connection of the upper end spray pipe assembly is loosened, in view of the screw transmission principle, the spray pipe assembly is required to move along the axial direction, the axial movement of the spray pipe assembly is limited by the compression of the double-tightening adjusting assembly, the locking limitation of the connection of the upper end spray pipe assembly and the double-tightening adjusting assembly is formed, the connection of the lower end spray pipe assembly and the lower end of the double-tightening adjusting assembly is the same as the connection of the upper end spray pipe assembly and the lower end of the double-tightening adjusting assembly, the locking limitation of the connection of the lower end spray pipe assembly and the double-tightening adjusting assembly is also formed, the stability of the connection of the spray pipe assembly and the double-tightening adjusting assembly is further effectively improved, the adjustment of the double-tightening adjusting assembly is performed by utilizing the screw rod tightly screwed on the double-tightening adjusting assembly, the screw rod driving mechanism is reduced, and the structure is simple.

Description

Sand blasting perforation device and ultra-short radius horizontal well completion method

Technical Field

The application relates to the technical field of oil well exploitation, in particular to a sand blasting perforation device and an ultra-short radius horizontal well completion method.

Background

During oil and gas exploitation, a perforation process is generally adopted to carry out sand blasting perforation on the inner side of an oil pipe, so that high-pressure liquid containing sand impacts a sleeve, a cement ring and a stratum, the inner side of a shaft is communicated with an oil layer, and oil and gas exploitation is facilitated.

In the related art, the spray pipes on the sand blasting perforation device are mutually connected through the adjusting mechanism, the adjusting mechanism adjusts the distance between the adjacent spray pipes, the spray pipes are conveniently subjected to sand blasting perforation, the spray pipes and the adjusting mechanism are sleeved, matched and sealed through the connecting rings and fixed through bolts, but in the mode, the first mode, the fastening between the spray pipes and the adjusting mechanism is only realized through the bolts, if the bolts are loosened or the adjusting mechanism is separated from the spray pipes in an underground oil well due to the working environment of the spray pipes, the recovery of the spray pipes or the adjusting mechanism is very difficult, so that the technical problem that needs to be considered is solved in terms of how to improve the connection stability between the spray pipes and the adjusting mechanism, the second mode and the adjusting mechanism are driven through independent threaded rods, corresponding adjusting guide and limiting are required to be arranged, and the structure is relatively complex.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a sand blasting perforation device and ultrashort radius horizontal well completion method, sand blasting perforation device effectively improves the stability of spray tube subassembly and the junction of two tight adjusting part, and the regulation of two tight adjusting part utilizes its two tight adjusting part to go on, reduces and sets up screw drive's mechanism again, simple structure.

In a first aspect, embodiments of the present application provide a sand blasting perforating device comprising: a spout assembly, a dual tightening adjustment assembly, and a spray assembly.

Adjacent connect through two tight regulation subassembly that closes between the spray tube subassembly, the upper end spray tube subassembly threaded connection in the inside of two tight regulation subassembly upper ends that close, two tight regulation subassembly upper ends of closing press in the spray tube subassembly of upper end, two tight regulation subassembly's lower extreme threaded connection that closes in the spray tube subassembly of lower extreme, two tight regulation subassembly lower extreme of closing press in the spray tube subassembly of lower extreme, the lower extreme threaded connection of spray tube subassembly of lower extreme in the shower nozzle subassembly, the shower nozzle subassembly compress tightly in the spray tube subassembly of lower extreme.

According to some embodiments of the present application, the spray pipe assembly includes spray pipe, first fixing base, first connecting seat, first locking plate and centralizer, first fixing base fixed connection in the spray pipe top, first connecting seat fixed connection in the spray pipe bottom, first locking plate sliding sleeve in the spray pipe, first connecting seat threaded connection in the upper end of double tight regulation subassembly, double tight regulation subassembly drive first locking plate compresses tightly first connecting seat, double tight regulation subassembly lower extreme threaded connection in adjacent the first fixing base of spray pipe assembly, centralizer fixed sleeve in the spray pipe upper end.

According to some embodiments of the application, the first locking plate comprises an annular plate body, through holes are formed in the annular plate body at equal intervals, the upper ends of the double-tightening adjusting assemblies penetrate through the through holes, and the upper ends of the double-tightening adjusting assemblies are tightly pressed on the periphery of the through holes.

According to some embodiments of the application, the first fixing base comprises a fixing base body, a first sealing ring and an annular connecting plate, a first slope surface is arranged inside the fixing base body, the first sealing ring is fixedly connected to the fixing base body in the first slope surface, the annular connecting plate is fixedly sleeved to the inner part of the upper end of the fixing base body, a thread groove is formed in the bottom of the inner part of the fixing base body, the lower end of the double-tightening adjusting component is connected to the thread groove through threads, the double-tightening adjusting component compresses the first sealing ring, and the double-tightening adjusting component compresses the annular connecting plate.

According to some embodiments of the application, the first connecting seat comprises a connecting seat body, a limiting block and a connecting cylinder, the limiting block is fixedly connected to the outer wall of the upper end of the connecting seat body, the connecting cylinder is fixedly connected to the bottom end of the connecting seat body, the outer wall of the connecting seat body is provided with a second slope surface, the connecting cylinder is in threaded connection with the upper end of the double-parallel tight adjusting assembly, the outer wall of the connecting seat body is tightly pressed to the inner wall of the upper end of the double-parallel tight adjusting assembly to form a seal, and the double-parallel tight adjusting assembly drives the first locking plate to be tightly pressed to the limiting block.

According to some embodiments of the present application, the dual tightening adjustment assembly comprises a movable adjustment seat, a fixed adjustment seat, a second fixing seat, a second connecting seat, a tightening adjustment screw member and a second locking plate, the lower end of the movable adjustment seat is slidably inserted into the fixed adjustment seat, the second fixing seat is identical to the first fixing seat in structure, the second fixing seat is fixedly connected to the upper end of the movable adjustment seat, the upper end of the spray pipe assembly is in the threaded groove of the second fixing seat through threaded connection, the upper end of the spray pipe assembly is in the outer wall of the connecting seat body is compressed to the first sealing ring in the second fixing seat, the upper end of the tightening adjustment screw member passes through the annular connecting plate and the upper end of the second fixing seat, the upper end of the tightening adjustment screw member drives the first locking plate and the annular connecting plate to be mutually tightened, the second connecting seat is identical to the first connecting seat in structure, the second connecting seat is fixedly connected to the connecting seat through threaded connection in the connecting seat in the threaded groove of the second connecting seat, the lower end of the second connecting seat is in the annular connecting plate and the lower end of the second connecting seat is in a sleeved connection, and the lower end of the annular connecting plate passes through the annular connecting plate is in the annular connecting plate.

According to some embodiments of the present application, the movable adjustment seat comprises a movable adjustment cylinder, a piston ring and a second sealing ring, the piston ring is fixedly sleeved on the outer wall of the lower end of the movable adjustment cylinder, the second sealing ring is fixedly sleeved on the outer wall of the piston ring, the piston ring is slidably connected in the fixed adjustment seat, and the piston ring drives the second sealing ring to be tightly pressed on the inner wall of the fixed adjustment seat through elastic deformation.

According to some embodiments of the present application, the fixed adjustment seat includes a fixed adjustment cylinder and a stop collar, the stop collar fixed connection in fixed adjustment cylinder top, piston ring sliding connection in the fixed adjustment cylinder, the stop collar can block the piston ring.

According to some embodiments of the present application, the tightening adjusting screw member includes a first connecting locking portion, a second connecting locking portion and a bidirectional adjusting cylinder, the first connecting locking portion includes a first screw rod, a first positioning column, a first force application column and a first nut, the first positioning column is fixedly connected to one end of the first screw rod, the first force application column is fixedly connected to an end of the first positioning column, the first screw rod passes through an upper end of the first locking plate of the nozzle assembly and the annular connecting plate of the second fixing seat, the first positioning column is inserted into the first locking plate, the first force application column compresses the first locking plate, the first nut is in threaded connection with the first screw rod, the first nut compresses the annular connecting plate of the second fixing seat, the second connecting locking portion is identical to the first connecting locking portion in structure, the second locking plate passes through the second connecting locking portion and the lower end of the nozzle assembly the annular connecting plate is inserted into the first connecting plate of the first connecting column and the second locking portion, the first nut is inserted into the second connecting plate of the second locking portion of the nozzle assembly, and the second nut is inserted into the second connecting plate of the second locking portion of the nozzle assembly.

According to some embodiments of the present application, a guiding limiting part is arranged between the annular connecting plate and the second locking plate of the second fixing seat, the guiding limiting part and the tightening adjusting screw part are arranged at intervals, the guiding limiting part comprises a first limiting cylinder, a second limiting cylinder, a limiting rod, a second nut and a third nut, the first limiting cylinder is fixedly connected to the lower side of the annular connecting plate of the second fixing seat, the second limiting cylinder is fixedly connected to the upper side of the second locking plate, the limiting rod penetrates through the first limiting cylinder and the second limiting cylinder, the upper end of the limiting rod penetrates through the annular connecting plate and the upper end of the second fixing seat, the first locking plate of the spray pipe assembly, the lower end of the limiting rod penetrates through the second locking plate and the lower end of the spray pipe assembly, the second nut and the third nut are sleeved on the limiting rod through threads, and the second nut is respectively compressed to the upper end of the spray pipe assembly, the first limiting cylinder and the second nut are compressed to the first end of the spray pipe assembly and the second nut are respectively.

According to some embodiments of the present application, the spray head assembly includes a spray head, a third fixing base and a third connection locking part, the third fixing base and the first fixing base are identical in structure, the third fixing base is fixedly connected to the upper end of the spray head, the bottom the connecting cylinder of the spray pipe assembly is connected to the third fixing base through threads in the thread groove, the bottom the outer wall of the connecting base of the spray pipe assembly is tightly pressed to the first sealing ring in the third fixing base, and the bottom is tightly connected to the locking part through the third connection between the first locking plate of the spray pipe assembly and the annular connecting plate of the third fixing base.

According to some embodiments of the present application, the third connection locking portion includes a second screw rod, a second positioning column, a second force application column and a fourth nut, the second positioning column is fixedly connected to one end of the second screw rod, the second force application column is fixedly connected to the end of the second positioning column, the second screw rod passes through the annular connecting plate of the third fixing seat and the bottom end of the first locking plate of the spray pipe assembly, the second positioning column is inserted into the annular connecting plate of the third fixing seat, the second force application column compresses tightly the annular connecting plate of the third fixing seat, the fourth nut is in threaded sleeve connection with the second screw rod, and the second screw rod compresses tightly the bottom end of the first locking plate of the spray pipe assembly.

In a second aspect, an embodiment of the present application further provides a method for completing an ultrashort radius horizontal well, where the perforating is performed by using the sand blasting perforation device, including the following steps:

s1: preparing a sand blasting perforating device and a tool meeting the conditions;

s2: a fracturing string is put into, and the fracturing string is guided into a designed fracturing depth in a well bottom horizontal section by an ultra-short radius inclined guide;

s3: installing a wellhead blowout preventer, and connecting a 700-type fracturing wellhead with the withstand voltage of 70 MPa;

s4: connecting a fracturing pipeline and a manifold;

s5: setting a packer;

s6: starting the fracturing pumps one by one, gradually increasing the pressure to reach the designed construction displacement to open the stratum, and injecting the stratum according to the designed front liquid amount;

s7: according to the design sand ratio from low to high until the sand ratio is added to a preset value, the sand mixing vehicle keeps the single vehicle liquid supply amount to be more than 10 cubic meters per minute, and a sand blasting perforating device is utilized for perforation;

s8: driving the inner volume of the string into the fracturing string for replacing the squeeze liquid by 1.1 times;

s9: stopping the pump truck, measuring the pump pressure, closing the well for more than 40 minutes and diffusing the pressure;

s10: controlling the open flow by adopting a nozzle until the oil pressure is lower than 5MPa;

s11: reversely circulating sand flushing with fracturing fluid base fluid to 1.5-2 times of the volume of the shaft;

s12: lifting the fracturing string, removing the wellhead screw, lowering the fracturing string for 1-2 times, lifting the fracturing string, lifting the packer to a designed second stage fracturing position, and setting the wellhead;

S12: repeating the operations of setting the packer, fracturing, adding sand, replacing extrusion, diffusing pressure, open-flow, lifting the fracturing string to the depth of the next fracturing layer;

s13: and repeating the working procedures until all the fracturing intervals are completed, and starting the fracturing string and completing the well.

The beneficial effects of this application are: when adjacent spray pipe assembly and double tight regulation subassembly are connected, the spray pipe assembly threaded connection of upper end is in the inside of double tight regulation subassembly upper end, rethread double tight regulation subassembly compresses tightly in the spray pipe assembly of upper end, because the threaded connection department of upper end spray pipe assembly takes off, in view of the screw drive principle, need the spray pipe assembly along axial movement, and the axial movement of spray pipe assembly receives the restriction that compresses tightly of double tight regulation subassembly, form the locking restriction of upper end spray pipe assembly and double tight regulation subassembly junction, the lower extreme spray pipe assembly and double tight regulation subassembly lower extreme be connected with last mode the same, also can form the locking restriction of lower extreme spray pipe assembly and double tight regulation subassembly junction, and then effectively improve the stability of spray pipe assembly and double tight regulation subassembly junction, the regulation of double tight regulation subassembly utilizes its double tight regulation subassembly to go on with tight screw rod, reduce the mechanism that sets up screw rod drive again, and a structure is simple.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic perspective view of a sand blasting perforating device according to an embodiment of the present application;

FIG. 2 is a schematic perspective view of a spout assembly according to an embodiment of the present application;

FIG. 3 is an enlarged schematic perspective view of FIG. 2A according to an embodiment of the present application;

FIG. 4 is an enlarged schematic perspective view of FIG. 2B according to an embodiment of the present application;

FIG. 5 is a schematic perspective view of a dual tightening adjustment assembly according to an embodiment of the present application;

FIG. 6 is a schematic view of a structure of a joint of a movable adjustment seat and a fixed adjustment seat according to an embodiment of the present application;

FIG. 7 is a schematic perspective view of a tightening adjustment screw in accordance with an embodiment of the present application;

FIG. 8 is a schematic perspective view of a guide limiter according to an embodiment of the present application;

FIG. 9 is a schematic perspective view of a showerhead assembly according to an embodiment of the present application;

fig. 10 is a schematic perspective view of a third connection locking portion according to an embodiment of the present application.

Icon: a 100-nozzle assembly; 110-spraying pipe; 120-a first fixing seat; 121-a fixed seat body; 122-a first ramp surface; 123-a first sealing ring; 124-thread groove; 125-annular connection plates; 130-a first connection base; 131-connecting the seat body; 132-limiting blocks; 133-connecting the cylinders; 140-a first locking plate; 141-an annular plate body; 142-through holes; 150-centralizer; 200-double tightening adjusting components; 210-a movable adjusting seat; 211-a movable adjustment cylinder; 212-piston rings; 213-a second sealing ring; 220-fixing an adjusting seat; 221-fixing an adjusting cylinder; 222-a limiting ring; 230-a second fixing seat; 240-a second connection base; 250-tightening the adjusting screw; 251-first connection locking portion; 2511—a first screw; 2512—a first positioning column; 2513—a first force application post; 2514—a first nut; 252-a second connection locking portion; 253—a bidirectional adjustment cylinder; 260-a second locking plate; 270-guiding limiting piece; 271-a first limiting cylinder; 272-a second limiting cylinder; 273-limiting rod; 274-a second nut; 275-a third nut; 300-a spray head assembly; 310-spray head; 320-a third fixing seat; 330-a third connection locking portion; 331-second screw; 332-a second positioning column; 333-a second force application post; 334-fourth nut.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some of the embodiments of the present application, but not all of the embodiments. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of the present application.

A sand blasting perforating apparatus and an ultra-short radius horizontal well completion method according to embodiments of the present application are described below with reference to the accompanying drawings.

Referring to fig. 1 to 10, an embodiment of the present application provides a sand blasting perforation device, including: spout assembly 100, dual tightening adjustment assembly 200, and spray head assembly 300.

Referring to fig. 1, adjacent nozzle assemblies 100 are connected through a dual tightening adjustment assembly 200, the nozzle assembly 100 at the upper end is screwed into the dual tightening adjustment assembly 200, the upper end of the dual tightening adjustment assembly 200 is tightly pressed against the nozzle assembly 100 at the upper end, the lower end of the dual tightening adjustment assembly 200 is screwed into the nozzle assembly 100 at the lower end, the lower end of the dual tightening adjustment assembly 200 is tightly pressed against the nozzle assembly 100 at the lower end, the lower end of the nozzle assembly 100 at the lower end is screwed against the nozzle assembly 300, and the nozzle assembly 300 is tightly pressed against the nozzle assembly 100 at the lower end. When the adjacent spray pipe assemblies 100 and the double tightening adjusting assemblies 200 are connected, the spray pipe assemblies 100 at the upper ends are in threaded connection with the inside of the upper ends of the double tightening adjusting assemblies 200, the double tightening adjusting assemblies 200 are pressed on the spray pipe assemblies 100 at the upper ends, as the threaded connection parts of the spray pipe assemblies 100 at the upper ends are loosened, the spray pipe assemblies 100 are required to move along the axial direction in view of the threaded transmission principle, the axial movement of the spray pipe assemblies 100 is limited by the pressing of the double tightening adjusting assemblies 200, the locking limitation of the connection parts of the upper end spray pipe assemblies 100 and the double tightening adjusting assemblies 200 is formed, the connection parts of the lower end spray pipe assemblies 100 and the lower ends of the double tightening adjusting assemblies 200 are the same as the above mode, the locking limitation of the connection parts of the lower end spray pipe assemblies 100 and the double tightening adjusting assemblies 200 is also formed, the stability of the connection parts of the spray pipe assemblies 100 and the double tightening adjusting assemblies 200 is further effectively improved, the adjustment of the double tightening adjusting assemblies 200 is carried out by utilizing screw rods on the double tightening adjusting assemblies 200, and the screw driving mechanism is reduced, and the structure is simple.

Referring to fig. 1 to 2, the nozzle assembly 100 includes a nozzle 110, a first fixing base 120, a first connecting base 130, a first locking plate 140 and a centralizer 150, wherein the first fixing base 120 is fixedly connected to the top end of the nozzle 110, the first connecting base 130 is fixedly connected to the bottom end of the nozzle 110, the first locking plate 140 is slidably sleeved on the nozzle 110, the first connecting base 130 is in threaded connection with the upper end of the dual tightening adjustment assembly 200, the dual tightening adjustment assembly 200 drives the first locking plate 140 to compress the first connecting base 130, the lower end of the dual tightening adjustment assembly 200 is in threaded connection with the first fixing base 120 of the adjacent nozzle assembly 100, and the centralizer 150 is fixedly sleeved on the upper end of the nozzle 110. When the spray pipe 110 moves, the spray pipe 110 is kept at a position inside the sleeve through the centralizer 150, spray holes are formed in the spray pipe 110, a guide cover is arranged inside the spray holes, intercepting and guiding are carried out on high-pressure liquid containing sand, part of the high-pressure liquid containing sand flows to the spray holes and is sprayed outwards through the spray holes, then the liquid flows to the inside of the spray head assembly, guiding and diffusing are carried out on the high-pressure liquid containing sand in the spray head assembly, and the rest of the high-pressure liquid containing sand is sprayed outwards through the spray head assembly, so that sand blasting and perforation are carried out on the sleeve. When the upper end spray pipe assembly 100 is connected with the double-tightening adjusting assembly 200 and the bottom end spray pipe assembly 100 is connected with the spray head assembly 300, the first connecting seat 130 at the bottom end of the spray pipe 110 is screwed into the double-tightening adjusting assembly 200 and the spray head assembly 300 through threads, the outer wall of the first connecting seat 130, the double-tightening adjusting assembly 200 and the inner wall of the spray head assembly 300 are tightly pressed to form a seal, and the double-tightening adjusting assembly 200 and the spray head assembly 300 drive the first locking plate 140 to tightly press the first connecting seat 130 to form a connecting part for locking, so that the stability of the connecting part is improved. When the lower end spray pipe assembly 100 is connected with the double-tightening adjusting assembly 200, the lower end of the double-tightening adjusting assembly 200 is screwed into the first fixing seat 120 of the lower end spray pipe assembly 100 through threads, the outer wall of the lower end of the double-tightening adjusting assembly 200 and the inner wall of the first fixing seat 120 are tightly pressed to form a seal, and the double-tightening adjusting assembly 200 is tightly pressed to the first fixing seat 120 to form a joint locking, so that the stability of the joint is improved.

Referring to fig. 1 to 3, the first fixing base 120 includes a fixing base body 121, a first sealing ring 123 and an annular connecting plate 125, a first slope surface 122 is provided inside the fixing base body 121, the first sealing ring 123 is fixedly connected in the first slope surface 122 of the fixing base body 121, the annular connecting plate 125 is fixedly sleeved inside the upper end of the fixing base body 121, a threaded groove 124 is provided at the bottom end inside the fixing base body 121, the lower end of the double-tightening adjusting assembly 200 is connected to the threaded groove 124 through threads, the double-tightening adjusting assembly 200 compresses the first sealing ring 123, and the double-tightening adjusting assembly 200 compresses the annular connecting plate 125.

Referring to fig. 1 to 4, the first connecting seat 130 includes a connecting seat body 131, a limiting block 132 and a connecting tube 133, the limiting block 132 is fixedly connected to an outer wall of an upper end of the connecting seat body 131, the connecting tube 133 is fixedly connected to a bottom end of the connecting seat body 131, a second slope surface is provided on an outer wall of the connecting seat body 131, the connecting tube 133 is in threaded connection with an upper end of the dual-tightening adjusting assembly 200, an outer wall of the connecting seat body 131 is tightly pressed against an inner wall of an upper end of the dual-tightening adjusting assembly 200 to form a seal, and the dual-tightening adjusting assembly 200 drives the first locking plate 140 to be tightly pressed against the limiting block 132. The first locking plate 140 includes an annular plate body 141, through holes 142 are formed in the annular plate body 141 at equal intervals, the upper end of the double tightening adjusting assembly 200 passes through the through holes 142, and the upper end of the double tightening adjusting assembly 200 is pressed against the periphery of the through holes 142.

Referring to fig. 1 to 5, the dual tightening adjustment assembly 200 includes a movable adjustment seat 210, a fixed adjustment seat 220, a second fixing seat 230, a second connection seat 240, a tightening adjustment screw member 250 and a second locking plate 260, wherein the lower end of the movable adjustment seat 210 is slidably inserted into the fixed adjustment seat 220, the second fixing seat 230 and the first fixing seat 120 have the same structure, the second fixing seat 230 is fixedly connected to the upper end of the movable adjustment seat 210, the connection cylinder 133 of the upper nozzle assembly 100 is screwed into the threaded groove 124 of the second fixing seat 230, the outer wall of the connection seat 131 of the upper nozzle assembly 100 is tightly pressed against the first sealing ring 123 in the second fixing seat 230, the upper end of the tightening adjustment screw member 250 passes through the annular connection plate 125 of the second fixing seat 230 and the first locking plate 140 of the upper nozzle assembly 100, the upper end of the tightening adjustment screw member 250 drives the first locking plate 140 to be mutually tightened against the annular connection plate 125, the second connection seat 240 and the first connection seat 130 have the same structure, the second connection seat 240 is fixedly connected to the bottom end of the fixed adjustment seat 220, the connection cylinder 133 of the second connection seat 240 is screwed into the threaded groove 124 of the second fixing seat 100, the connection cylinder 133 is tightly connected to the lower end of the nozzle assembly 100 by screwing the lower end of the lower end assembly 100, the second connection seat 125 passes through the second sealing ring 125 and the lower end of the second locking plate 260 is tightly screwed into the lower end of the annular connection plate 260, and the lower end of the second connection plate 260 is tightly screwed tightly connected to the second connection plate 125 by the lower end of the second connection plate 125. When the upper nozzle assembly 100 is connected to the dual fastening adjustment assembly 200, the first connection base 130 of the upper nozzle assembly 100 is connected to the second fixing base 230 of the dual fastening adjustment assembly 200 as follows: the connecting tube 133 of the first connecting seat 130 is screwed into the threaded groove 124 of the second fixing seat 230 through threads, and as the inner wall of the fixing seat body 121 and the outer wall of the connecting seat body 131 are both slope surfaces, along with the screwing of the connecting tube 133, the outer wall of the connecting seat body 131 gradually compresses the first sealing ring 123 in the second fixing seat 230 to form sealing, the upper end of the adjusting screw piece 250 passes through the annular connecting plate 125 of the second fixing seat 230 and the first locking plate 140 of the upper end spray pipe assembly 100, the lower end of the adjusting screw piece 250 is adjusted and tightly adjusted, the second locking plate 260 and the annular connecting plate 125 are tightly adjusted through tightly adjusting the screw piece 250, and meanwhile, the first locking plate 140 compresses the limiting block 132 of the first connecting seat 130, so that the first connecting seat 130 of the upper end spray pipe assembly 100 and the second fixing seat 230 are mutually compressed, and the stability of the joint of the first connecting seat 130 and the second fixing seat 230 of the upper end spray pipe assembly 100 is improved. When the lower nozzle assembly 100 is connected to the dual fastening adjustment assembly 200, the second connection base 240 of the dual fastening adjustment assembly 200 is first connected to the first fixing base 120 of the lower nozzle assembly 100 as follows: the connecting tube 133 of the second connecting seat 240 is screwed into the threaded groove 124 of the first fixing seat 120 through threads, and as the inner wall of the fixing seat body 121 and the outer wall of the connecting seat body 131 are both slope surfaces, along with the screwing of the connecting tube 133, the outer wall of the connecting seat body 131 gradually compresses the first sealing ring 123 in the first fixing seat 120 to form sealing, the lower end of the adjusting screw member 250 penetrates through the second locking plate 260 and the annular connecting plate 125 of the first fixing seat 120, the lower end of the adjusting screw member 250 is adjusted and tightly adjusted, the second locking plate 260 and the annular connecting plate 125 are tightly combined through the tightly adjusted screw member 250, and meanwhile, the second locking plate 260 compresses the limiting block 132 of the second connecting seat 240, so that the second connecting seat 240 and the first fixing seat 120 of the lower nozzle assembly 100 are mutually compressed, and the stability of the connecting position of the first fixing seat 120 of the second connecting seat 240 and the lower nozzle assembly 100 is improved.

Referring to fig. 1 to 6, the movable adjusting seat 210 includes a movable adjusting cylinder 211, a piston ring 212 and a second sealing ring 213, the piston ring 212 is fixedly sleeved on an outer wall of a lower end of the movable adjusting cylinder 211, the second sealing ring 213 is fixedly sleeved on an outer wall of the piston ring 212, the piston ring 212 is slidably connected in the fixed adjusting seat 220, and the piston ring 212 drives the second sealing ring 213 to compress against an inner wall of the fixed adjusting seat 220 through elastic deformation. The fixed adjusting seat 220 comprises a fixed adjusting cylinder 221 and a limiting ring 222, the limiting ring 222 is fixedly connected to the top end of the fixed adjusting cylinder 221, the piston ring 212 is slidably connected in the fixed adjusting cylinder 221, and the limiting ring 222 can block the piston ring 212.

Referring to fig. 1 to 7, the tight adjustment screw member 250 includes a first connection locking part 251, a second connection locking part 252 and a bidirectional adjustment cylinder 253, the first connection locking part 251 includes a first screw 2511, a first positioning column 2512, a first force application column 2513 and a first nut 2514, the first positioning column 2512 is fixedly connected to one end of the first screw 2511, the first force application column 2513 is fixedly connected to the end of the first positioning column 2512, the first screw 2511 passes through the first locking plate 140 of the upper end nozzle assembly 100 and the annular connection plate 125 of the second fixing base 230, the first positioning column 2512 is inserted into the first locking plate 140, the first force application column 2513 compresses the first locking plate 140, the first nut 2514 is screwed on the first screw 2511, the first nut 2514 compresses the annular connection plate 125 of the second fixing base 230, the second connection locking part 252 is the same as the first connection locking part 251, the second locking plate 260 and the annular connection plate 125 of the lower end nozzle assembly 100 are tightly connected through the second connection locking part 252, the second connection locking part 252 is inserted into the second connection locking plate 252 and the lower end of the annular connection plate 2512 is inserted into the first screw 2511 or the second connection locking plate 252 is screwed on the second connection plate 252 of the second connection rod 2511, the second connection locking part 252 is screwed on the second connection plate 252 is screwed on the annular connection plate 125 of the second fixing base 230, and the second connection plate is compressed on the annular connection plate 125 is compressed on the first connection plate 252. When the first connection locking part 251 is tightly connected with the first locking plate 140 of the upper nozzle assembly 100 and the annular connection plate 125 of the second fixing seat 230, the first screw 2511 penetrates through the first locking plate 140 of the upper nozzle assembly 100 and the annular connection plate 125 of the second fixing seat 230, the first positioning column 2512 is inserted into the first locking plate 140 to limit the rotation of the first screw 2511, the first force application column 2513 tightly presses the first locking plate 140, the first nut 2514 is in threaded connection with the first screw 2511, the first nut 2514 tightly presses the annular connection plate 125 of the second fixing seat 230, the purpose of tightly connecting the first locking plate 140 of the upper nozzle assembly 100 and the annular connection plate 125 of the second fixing seat 230 is achieved, and the process of tightly connecting the second connection locking part 252 with the second locking plate 260 and the annular connection plate 251 of the lower nozzle assembly 100 is the same as the step of tightly connecting the first locking plate 140 of the upper nozzle assembly 100 and the annular connection plate 125 of the second fixing seat 230, so as to achieve the purpose of tightly connecting the second locking plate 260 and the annular connection plate 125 of the lower nozzle assembly 100. When the distance between adjacent spray pipe assemblies 100 is adjusted, the bidirectional adjusting cylinder 253 is rotated, the first screw 2511 of the first connection locking part 251 and the second connection locking part 252 synchronously extends or retracts the bidirectional adjusting cylinder 253, the first screw 2511 pushes the upper end spray pipe assembly 100 to be far away from or close to the lower end spray pipe assembly 100 due to the fact that the root of the first screw 2511 is fixed, meanwhile, the piston ring 212 of the movable adjusting cylinder 211 slides along the fixed adjusting cylinder 221, the piston ring 212 and the fixed adjusting cylinder 221 are sealed through the second sealing ring 213, the limiting ring 222 limits the movable adjusting cylinder 211 to slide, and the situation that the movable adjusting cylinder 211 is separated from the fixed adjusting cylinder 221 is reduced.

Referring to fig. 1 to 8, in the related art, the adjusting mechanism and the nozzle assembly of the sand blasting perforation device are connected and locked by the double tightening adjusting assembly and the function of adjusting the distance between the nozzle assemblies, but the movable adjusting seat and the fixed adjusting seat of the double tightening adjusting assembly are connected and locked by the tightening adjusting screw member, because the tightening adjusting screw member adopts the three-stage interconnection mode, the axial tensile and compressive resistance of the connecting part of the screw and the bidirectional adjusting cylinder is stronger, the deformation resistance is poor when the screw and the bidirectional adjusting cylinder are stressed radially, and the tightening adjusting screw member has supporting points at two ends only when being installed, so when the mutual rotation movement trend exists between the movable adjusting seat and the fixed adjusting seat, the stability of the mutual rotation direction of the movable adjusting seat and the fixed adjusting seat is maintained by the tightening adjusting screw member, and how to improve the stability of the mutual rotation direction of the movable adjusting seat and the fixed adjusting seat is poor becomes the technical problem to be solved.

In this embodiment, a guiding and limiting member 270 is disposed between the annular connecting plate 125 of the second fixing seat 230 and the second locking plate 260, the guiding and limiting member 270 and the tightening adjusting screw 250 are arranged at intervals, the guiding and limiting member 270 includes a first limiting cylinder 271, a second limiting cylinder 272, a limiting rod 273, a second nut 274 and a third nut 275, the first limiting cylinder 271 is fixedly connected to the lower side of the annular connecting plate 125 of the second fixing seat 230, the second limiting cylinder 272 is fixedly connected to the upper side of the second locking plate 260, the limiting rod 273 passes through the first limiting cylinder 271 and the second limiting cylinder 272, the upper end of the limiting rod 273 passes through the annular connecting plate 125 of the second fixing seat 230 and the first locking plate 140 of the upper nozzle assembly 100, the lower end of the limiting rod 273 passes through the second locking plate 260 and the annular connecting plate 125 of the lower nozzle assembly 100, the second nut 274 and the third nut 275 are sleeved on the limiting rod 273 through threads, the second nut 274 is respectively compressed on the first locking plate 140 of the upper nozzle assembly 100 and the annular connecting plate 125 of the lower nozzle assembly 100, and the third nut 274 is respectively compressed on the end of the first limiting cylinder 271 and the second limiting cylinder 272. After the adjusting mechanism and the spray pipe components are connected through the double tightening adjusting components, after the space between the adjacent spray pipe components is adjusted, the limiting rod 273 sequentially passes through the first limiting cylinder 271 and the second limiting cylinder 272, in the process that the limiting rod 273 passes through the first limiting cylinder 271 and the second limiting cylinder 272, the third nut 275 is screwed on the limiting rod 273, after the limiting rod 273 passes through the first limiting cylinder 271 and the second limiting cylinder 272, the second nut 274 is screwed on two ends of the limiting rod 273, the first locking plate 140 of the upper spray pipe component 100 and the annular connecting plate 125 of the lower spray pipe component 100 are tightly pressed through the second nut 274, afterwards, the third nut 275 is rotated to respectively press the ends of the first limiting cylinder 271 and the second limiting cylinder 272, the relative positions of the piston ring 212 and the fixed adjusting cylinder 221 are further maintained through the third nut 275, the position change of the adjacent spray pipe components needs to be synchronously adjusted and the tightening adjusting screw rod and the third nut, the occurrence of the condition that the relative position change of the adjacent spray pipe components is caused by external factors is reduced, and the relative positions of the adjacent spray pipe components are favorable for maintaining the relative positions of the adjacent spray pipe components. The first locking plate 140 of the upper end spray pipe assembly 100 and the annular connecting plate 125 of the lower end spray pipe assembly 100 are tightly pressed by the second nut 274, so that the joint of the adjacent spray pipe assemblies and the double-tightening adjusting assembly is locked, and a pressing force is provided, thereby being beneficial to keeping the stability of the joint. The first limiting cylinder 271 and the second limiting cylinder 272 are fixed on the annular connecting plate 125 and the second locking plate 260, guided by the whole limiting rod 273, are not disconnected at the middle position without three sections, so that the overall stability is good, the supporting point spacing of the limiting rod 273 is smaller than that of the supporting point spacing of the tightening adjusting screw part, and the stabilizing capability of the mutual rotating direction of the movable adjusting seat and the fixed adjusting seat is effectively improved.

Referring to fig. 1 to 9, the spray head assembly 300 includes a spray head 310, a third fixing base 320 and a third connection locking portion 330, the third fixing base 320 and the first fixing base 120 have the same structure, the third fixing base 320 is fixedly connected to the upper end of the spray head 310, the connecting tube 133 of the bottom nozzle assembly 100 is connected to the threaded groove 124 of the third fixing base 320 through threads, the outer wall of the connecting base body 131 of the bottom nozzle assembly 100 is pressed against the first sealing ring 123 in the third fixing base 320, and the first locking plate 140 of the bottom nozzle assembly 100 is tightly connected to the annular connecting plate 125 of the third fixing base 320 through the third connection locking portion 330.

Referring to fig. 1 to 10, the third connection locking portion 330 includes a second screw 331, a second positioning column 332, a second force application column 333, and a fourth nut 334, where the second positioning column 332 is fixedly connected to one end of the second screw 331, the second force application column 333 is fixedly connected to an end of the second positioning column 332, the second screw 331 passes through the annular connecting plate 125 of the third fixing seat 320 and the first locking plate 140 of the bottom nozzle assembly 100, the second positioning column 332 is inserted into the annular connecting plate 125 of the third fixing seat 320, the second force application column 333 compresses the annular connecting plate 125 of the third fixing seat 320, the fourth nut 334 is screwed onto the second screw 331, and the second screw 331 compresses the first locking plate 140 of the bottom nozzle assembly 100. When the bottom nozzle assembly 100 is connected to the nozzle assembly 300, the first connection base 130 of the bottom nozzle assembly 100 is first connected to the third fixing base 320 of the nozzle assembly 300 as follows: the connecting tube 133 of the first connecting seat 130 is screwed into the thread groove 124 of the third fixing seat 320 through threads, because the inner wall of the fixing seat body 121 and the outer wall of the connecting seat body 131 are both slope surfaces, along with the screwing of the connecting tube 133, the outer wall of the connecting seat body 131 gradually compresses the first sealing ring 123 in the third fixing seat 320 to form sealing, the second screw rod 331 penetrates through the annular connecting plate 125 of the third fixing seat 320 and the first locking plate 140 of the bottom nozzle assembly 100, the second positioning column 332 is inserted into the annular connecting plate 125 of the third fixing seat 320, the second force application column 333 compresses the annular connecting plate 125 of the third fixing seat 320, the fourth nut 334 is sleeved on the second screw rod 331 through threads, the second screw rod 331 compresses the first locking plate 140 of the bottom nozzle assembly 100, and the purpose of tightening the first locking plate 140 of the bottom nozzle assembly 100 and the annular connecting plate 125 of the third fixing seat 320 is achieved, and the stability of the joint of the bottom nozzle assembly 100 and the nozzle assembly 300 is improved.

The embodiment of the application also provides a completion method of the ultra-short radius horizontal well, which uses the sand blasting perforation device to carry out perforation, and comprises the following steps:

s1: preparing a sand blasting perforating device and a tool meeting the conditions;

s2: a fracturing string is put into, and the fracturing string is guided into a designed fracturing depth in a well bottom horizontal section by an ultra-short radius inclined guide;

s3: installing a wellhead blowout preventer, and connecting a 700-type fracturing wellhead with the withstand voltage of 70 MPa;

s4: connecting a fracturing pipeline and a manifold;

s5: setting a packer;

s6: starting the fracturing pumps one by one, gradually increasing the pressure to reach the designed construction displacement to open the stratum, and injecting the stratum according to the designed front liquid amount;

s7: according to the design sand ratio from low to high until the sand ratio is added to a preset value, the sand mixing vehicle keeps the single vehicle liquid supply amount to be more than 10 cubic meters per minute, and a sand blasting perforating device is utilized for perforation;

s8: driving the inner volume of the string into the fracturing string for replacing the squeeze liquid by 1.1 times;

s9: stopping the pump truck, measuring the pump pressure, closing the well for more than 40 minutes and diffusing the pressure;

s10: controlling the open flow by adopting a nozzle until the oil pressure is lower than 5MPa;

s11: reversely circulating sand flushing with fracturing fluid base fluid to 1.5-2 times of the volume of the shaft;

s12: lifting the fracturing string, removing the wellhead screw, lowering the fracturing string for 1-2 times, lifting the fracturing string, lifting the packer to a designed second stage fracturing position, and setting the wellhead;

S12: repeating the operations of setting the packer, fracturing, adding sand, replacing extrusion, diffusing pressure, open-flow, lifting the fracturing string to the depth of the next fracturing layer;

s13: and repeating the working procedures until all the fracturing intervals are completed, and starting the fracturing string and completing the well.

According to geological design requirements, underground tools such as an oil pipe, a packer and a fracturing string are sent to an ultra-short radius open hole horizontal well design well section through an ultra-short radius slope guider by utilizing a workover rig and an external diameter 73mm or 88.9mm plus large oil pipe (according to well depth and design displacement), a fracturing truck group meeting construction requirements is utilized for carrying out first-stage fracturing, after the first-stage fracturing is completed, a second-stage fracturing position on the packer is subjected to fracturing, and so on, accurate geological targeted fracturing can be realized by adopting staged fracturing, fracturing materials are effectively utilized, the pertinence of fracturing transformation is improved, and the maximization of oil increasing benefit is realized.

Specifically, the working principle of the sand blasting perforation device and the ultra-short radius horizontal well completion method is as follows: when the first connection locking part 251 is tightly connected with the first locking plate 140 of the upper nozzle assembly 100 and the annular connection plate 125 of the second fixing seat 230, the first screw 2511 penetrates through the first locking plate 140 of the upper nozzle assembly 100 and the annular connection plate 125 of the second fixing seat 230, the first positioning column 2512 is inserted into the first locking plate 140 to limit the rotation of the first screw 2511, the first force application column 2513 tightly presses the first locking plate 140, the first nut 2514 is in threaded connection with the first screw 2511, the first nut 2514 tightly presses the annular connection plate 125 of the second fixing seat 230, the purpose of tightly connecting the first locking plate 140 of the upper nozzle assembly 100 and the annular connection plate 125 of the second fixing seat 230 is achieved, meanwhile, the first locking plate 140 tightly presses the limiting block 132 of the first connection seat 130, the first connection seat 130 of the upper nozzle assembly 100 and the second fixing seat 230 are mutually tightly pressed, due to the fact that the threaded connection is loosened, in view of the threaded transmission principle, the purpose of improving the stability of the connection position of the first connection seat 130 and the second fixing seat 230 of the upper nozzle assembly 100 is required to move along the axial direction. The process of the second connection locking part 252 and tightening the second locking plate 260 and the annular connection plate 125 of the lower nozzle assembly 100 is the same as the process of the first connection locking part 251 and tightening the first locking plate 140 of the upper nozzle assembly 100 and the annular connection plate 125 of the second fixing base 230, so that the purpose of tightening the second locking plate 260 and the annular connection plate 125 of the lower nozzle assembly 100 is achieved, and simultaneously, the second locking plate 260 compresses the limiting block 132 of the second connection seat 240 to enable the second connection seat 240 and the first fixing base 120 of the lower nozzle assembly 100 to mutually compress, and due to the loosening of the threaded connection part, axial movement is required in view of the threaded transmission principle, so that the purpose of improving the stability of the connection part of the second connection seat 240 and the first fixing base 120 of the lower nozzle assembly 100 is achieved. When the distance between adjacent spray pipe assemblies 100 is adjusted, the bidirectional adjusting cylinder 253 is rotated, the first screw 2511 of the first connection locking part 251 and the second connection locking part 252 synchronously extends or retracts the bidirectional adjusting cylinder 253, the first screw 2511 pushes the upper end spray pipe assembly 100 to be far away from or close to the lower end spray pipe assembly 100 due to the fact that the root of the first screw 2511 is fixed, meanwhile, the piston ring 212 of the movable adjusting cylinder 211 slides along the fixed adjusting cylinder 221, the piston ring 212 and the fixed adjusting cylinder 221 are sealed through the second sealing ring 213, the limiting ring 222 limits the movable adjusting cylinder 211 to slide, and the situation that the movable adjusting cylinder 211 is separated from the fixed adjusting cylinder 221 is reduced. The fastening of the first locking plate 140 of the upper nozzle assembly 100 and the annular connecting plate 125 of the second fixing seat 230 and the fastening of the second locking plate 260 and the annular connecting plate 125 of the lower nozzle assembly 100 effectively improve the stability of the joint of the nozzle assembly 100 and the double fastening adjusting assembly 200, and the space between adjacent nozzle assemblies 100 is completed by utilizing the fastening first screw 2511 matched with the bidirectional adjusting cylinder 253, so that a screw driving mechanism is reduced, and the structure is simple.

After the adjusting mechanism and the spray pipe components are connected through the double tightening adjusting components, after the space between the adjacent spray pipe components is adjusted, the limiting rod 273 sequentially passes through the first limiting cylinder 271 and the second limiting cylinder 272, in the process that the limiting rod 273 passes through the first limiting cylinder 271 and the second limiting cylinder 272, the third nut 275 is screwed on the limiting rod 273, after the limiting rod 273 passes through the first limiting cylinder 271 and the second limiting cylinder 272, the second nut 274 is screwed on two ends of the limiting rod 273, the first locking plate 140 of the upper spray pipe component 100 and the annular connecting plate 125 of the lower spray pipe component 100 are tightly pressed through the second nut 274, afterwards, the third nut 275 is rotated to respectively press the ends of the first limiting cylinder 271 and the second limiting cylinder 272, the relative positions of the piston ring 212 and the fixed adjusting cylinder 221 are further maintained through the third nut 275, the position change of the adjacent spray pipe components needs to be synchronously adjusted and the tightening adjusting screw rod and the third nut, the occurrence of the condition that the relative position change of the adjacent spray pipe components is caused by external factors is reduced, and the relative positions of the adjacent spray pipe components are favorable for maintaining the relative positions of the adjacent spray pipe components. The first locking plate 140 of the upper end spray pipe assembly 100 and the annular connecting plate 125 of the lower end spray pipe assembly 100 are tightly pressed by the second nut 274, so that the joint of the adjacent spray pipe assemblies and the double-tightening adjusting assembly is locked, and a pressing force is provided, thereby being beneficial to keeping the stability of the joint. The first limiting cylinder 271 and the second limiting cylinder 272 are fixed on the annular connecting plate 125 and the second locking plate 260, guided by the whole limiting rod 273, are not disconnected at the middle position without three sections, so that the overall stability is good, the supporting point spacing of the limiting rod 273 is smaller than that of the supporting point spacing of the tightening adjusting screw part, and the stabilizing capability of the mutual rotating direction of the movable adjusting seat and the fixed adjusting seat is effectively improved.

The above is only an example of the present application, and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

Claims (5)

1. Sand blasting perforation device, its characterized in that includes:

the spray pipe assembly comprises a spray pipe, a first fixing seat, a first connecting seat, a first locking plate and a centralizer, wherein the first fixing seat is fixedly connected to the top end of the spray pipe, the first connecting seat is fixedly connected to the bottom end of the spray pipe, and the first locking plate is in sliding sleeve connection with the spray pipe;

the spray pipe assembly is connected between adjacent spray pipe assemblies through the double-tightening adjusting assemblies, the spray pipe assembly at the upper end is in threaded connection with the inside of the upper end of the double-tightening adjusting assemblies, the upper end of the double-tightening adjusting assemblies is tightly pressed on the spray pipe assembly at the upper end, the lower end of the double-tightening adjusting assemblies is in threaded connection with the inside of the lower end of the spray pipe assembly, the lower end of the double-tightening adjusting assemblies is tightly pressed on the spray pipe assembly at the lower end, the first connecting seat is in threaded connection with the upper end of the double-tightening adjusting assemblies, the double-tightening adjusting assemblies drive the first locking plate to press the first connecting seat, the lower end of the double-tightening adjusting assemblies is in threaded connection with the adjacent first fixing seat, the centralizer is fixedly sleeved on the upper end of the spray pipe, the first fixing seat comprises a fixing seat body, a first sealing ring and an annular connecting seat, the first slope surface is fixedly connected with the first slope surface, the first sealing ring is fixedly connected with the inner slope surface of the slope body, the first sealing ring body is tightly connected with the inner wall of the annular connecting seat, the first connecting seat is tightly connected with the inner wall of the annular connecting seat, the upper end of the threaded connecting seat is fixedly connected with the groove of the threaded connecting seat, the threaded connecting seat is fixedly connected with the inner end of the groove of the threaded connecting seat, the threaded connecting seat is tightly connected with the threaded connecting seat, the threaded connecting seat is fixedly connected with the threaded connecting seat, and the threaded connecting seat is fixedly connected with the upper end of the sealing seat, the outer wall of the connecting seat body is tightly pressed on the inner wall of the upper end of the double-parallel tight adjusting assembly to form a seal, the double-parallel tight adjusting assembly drives the first locking plate to be tightly pressed on the limiting block, the double-parallel tight adjusting assembly comprises a movable adjusting seat, a fixed adjusting seat, a second fixing seat, a second connecting seat, a parallel tight adjusting screw piece and a second locking plate, the lower end of the movable adjusting seat is slidably inserted in the fixed adjusting seat, the second fixing seat and the first fixing seat are identical in structure, the second fixing seat is fixedly connected to the upper end of the movable adjusting seat, the connecting cylinder of the upper end of the spray pipe assembly is connected in the threaded groove of the second fixing seat through threads, the outer wall of the connecting seat of the upper end of the spray pipe assembly is tightly pressed on the first sealing ring in the second fixing seat, the upper end of the parallel tight adjusting screw piece passes through the annular connecting plate of the second fixing seat and the first locking plate of the upper end of the spray pipe assembly, the upper end of the parallel tight adjusting screw piece drives the first locking plate to be mutually connected with the second connecting seat through the annular connecting plate, the upper end of the connecting seat is tightly connected with the second connecting seat through the second connecting seat, the lower end of the annular connecting plate of the connecting seat is fixedly connected with the lower end of the connecting seat through threads, the upper end of the connecting seat is tightly connected with the second connecting seat, the upper end of the annular connecting seat is fixedly connected with the sealing ring of the spray pipe assembly, the lower end of the tightening adjusting screw rod drives the second locking plate and the annular connecting plate to be mutually tightened, the tightening adjusting screw rod comprises a first connecting locking part, a second connecting locking part and a bidirectional adjusting cylinder, the first connecting locking part comprises a first screw rod, a first positioning column, a first force application column and a first nut, the first positioning column is fixedly connected with one end of the first screw rod, the first force application column is fixedly connected with the end part of the first positioning column, the first screw rod penetrates through the upper end of the annular connecting plate of the spray pipe assembly, the first positioning column is inserted into the first locking plate, the first force application column compresses the first locking plate, the first nut is in threaded sleeve joint with the first screw rod, the first nut compresses the annular connecting plate of the second fixing seat, the second connecting locking part and the first connecting locking part have the same structure, the second locking plate and the lower end of the spray pipe assembly are in threaded connection with the first connecting plate of the second fixing seat, the first locking part is in threaded connection with the second connecting plate of the spray pipe assembly, the first locking part is in threaded connection with the second connecting plate of the annular connecting plate is in threaded connection with the threaded connection part of the second fixing seat, the first screw rods of the first connecting and locking part and the second connecting and locking part synchronously extend out of or retract into the bidirectional regulating cylinder;

The spray pipe assembly comprises a spray head assembly, wherein the lower end of the spray pipe assembly at the lower end is in threaded connection with the spray head assembly, and the spray head assembly is tightly pressed on the spray pipe assembly at the lower end.

2. The sand blasting perforating device according to claim 1, wherein the first locking plate comprises an annular plate body, through holes are formed in the annular plate body at equal intervals, the upper ends of the double-tightening adjusting assemblies penetrate through the through holes, and the upper ends of the double-tightening adjusting assemblies are pressed against the periphery of the through holes.

3. The sand blasting perforation device according to claim 1, wherein the movable adjusting seat comprises a movable adjusting cylinder, a piston ring and a second sealing ring, the piston ring is fixedly sleeved on the outer wall of the lower end of the movable adjusting cylinder, the second sealing ring is fixedly sleeved on the outer wall of the piston ring, the piston ring is slidably connected in the fixed adjusting seat, and the piston ring drives the second sealing ring to be pressed on the inner wall of the fixed adjusting seat through elastic deformation.

4. A sand blasting perforation apparatus according to claim 3, wherein the fixed adjustment base comprises a fixed adjustment barrel and a stop collar, the stop collar is fixedly connected to the top end of the fixed adjustment barrel, the piston ring is slidably connected to the fixed adjustment barrel, and the stop collar is capable of blocking the piston ring.

5. A method of completing an ultra-short radius horizontal well by using the sand blasting perforation device of any one of claims 1 to 4, comprising the steps of:

s1: preparing a sand blasting perforating device and a tool meeting the conditions;

s2: a fracturing string is put into, and the fracturing string is guided into a designed fracturing depth in a well bottom horizontal section by an ultra-short radius inclined guide;

s3: installing a wellhead blowout preventer, and connecting a 700-type fracturing wellhead with the withstand voltage of 70 MPa;

s4: connecting a fracturing pipeline and a manifold;

s5: setting a packer;

s6: starting the fracturing pumps one by one, gradually increasing the pressure to reach the designed construction displacement to open the stratum, and injecting the stratum according to the designed front liquid amount;

s7: according to the design sand ratio from low to high until the sand ratio is added to a preset value, the sand mixing vehicle keeps the single vehicle liquid supply amount to be more than 10 cubic meters per minute, and a sand blasting perforating device is utilized for perforation;

s8: driving the inner volume of the string into the fracturing string for replacing the squeeze liquid by 1.1 times;

s9: stopping the pump truck, measuring the pump pressure, closing the well for more than 40 minutes and diffusing the pressure;

s10: controlling the open flow by adopting a nozzle until the oil pressure is lower than 5MPa;

s11: reversely circulating sand flushing with fracturing fluid base fluid to 1.5-2 times of the volume of the shaft;

s12: lifting the fracturing string, removing the wellhead screw, lowering the fracturing string for 1-2 times, lifting the fracturing string, lifting the packer to a designed second stage fracturing position, and setting the wellhead;

S12: repeating the operations of setting the packer, fracturing, adding sand, replacing extrusion, diffusing pressure, open-flow, lifting the fracturing string to the depth of the next fracturing layer;

s13: and repeating the working procedures until all the fracturing intervals are completed, and starting the fracturing string and completing the well.