CN115506765B - Fixed-point injection single-seal ring air fluid replacement two-way fracturing device and method - Google Patents
Fixed-point injection single-seal ring air fluid replacement two-way fracturing device and method Download PDFInfo
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- CN115506765B CN115506765B CN202211174611.9A CN202211174611A CN115506765B CN 115506765 B CN115506765 B CN 115506765B CN 202211174611 A CN202211174611 A CN 202211174611A CN 115506765 B CN115506765 B CN 115506765B
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- 238000002347 injection Methods 0.000 title claims abstract description 45
- 239000007924 injection Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000002637 fluid replacement therapy Methods 0.000 title claims description 6
- 239000007788 liquid Substances 0.000 claims abstract description 60
- 238000007789 sealing Methods 0.000 claims abstract description 51
- 230000000903 blocking effect Effects 0.000 claims abstract description 20
- 239000012530 fluid Substances 0.000 claims description 28
- 238000005406 washing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/119—Details, e.g. for locating perforating place or direction
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Pipe Accessories (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a fixed-point injection single seal ring air fluid-supplementing two-way fracturing device and a method, wherein the device comprises a setting assembly, a perforating assembly and a double-passage sealing orifice device which are connected in sequence; the setting assembly comprises a deformable rubber cylinder, a plugging ball and a ball seat guide head, and a first inner channel is arranged on the rubber cylinder; the perforating assembly comprises a perforating gun body, wherein a second inner channel and a plurality of perforating nozzles communicated with the second inner channel are arranged on the perforating gun body; the double-passage sealing orifice device comprises a base, a pressure-bearing blocking cover, a sealing clamping joint, a liquid inlet pipe, a liquid injection valve and a liquid discharge valve; the invention combines the sleeve perforation operation and the staged fracturing operation, thereby greatly reducing the complicated construction procedures of multiple access in the independent operation process of conventional sleeve perforation and staged fracturing; the single-stage perforation and fracturing are integrated, the passage and the oil pipe in the drilling sleeve are fully utilized, the single-packer setting fracturing operation is realized, and the use loss of the packer can be reduced by times.
Description
Technical Field
The invention belongs to the technical field of underground hydraulic fracturing of coal mines, and particularly relates to a fixed-point injection single-seal ring air fluid replacement two-way fracturing device and method.
Background
Compared with a bare hole, the setting and fracturing construction environment in the underground drilling sleeve of the coal mine is greatly improved, but perforation operation is needed to be carried out on the sleeve before fracturing, so that the inlet procedure of a primary perforation tool is increased, meanwhile, the conventional oil pipe is subjected to double-sealing single-clamp fracturing, the double-packer setting is utilized, the fracturing fluid is sent into the space between the double packers for fracturing through the oil pipe, the fracturing fluid can only be injected through the oil pipe, and the fracturing fluid cannot be increased by utilizing the drift diameter in the sleeve.
Disclosure of Invention
Aiming at the technical requirements, the invention provides a fixed-point injection single-seal annular space fluid-filling two-way fracturing device and method, which integrate the ejector function and the setting function for perforating a sleeve, are matched with a double-passage sealing orifice device, and adopt a staged perforation fracturing combination process, so that the sleeve and an oil pipe annulus are also utilized to be a fracturing fluid channel, thereby not only reducing the hole inlet and outlet working procedures of a tool string, but also increasing the whole fluid passage section of fracturing fluid, and solving the problems of separate implementation of sleeve fracturing perforation and staged fracturing, multiple tool inlet and complicated working procedures.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
The invention discloses a fixed-point injection single seal ring air fluid-supplementing two-way fracturing device, which comprises a setting assembly, a perforating assembly and a double-passage sealing orifice device which are connected in sequence;
The setting assembly comprises a deformable rubber cylinder, a plugging ball and a ball seat guide head, wherein a first inner channel is formed in the rubber cylinder, the ball seat guide head is connected with the rubber cylinder, sieve holes which are communicated with the first inner channel and the outside are formed in the ball seat guide head, and the plugging ball is plugged after being put into the ball seat guide head;
the perforating assembly comprises a perforating gun body, wherein a second inner channel and a plurality of perforating nozzles communicated with the second inner channel are arranged on the perforating gun body; the perforating gun body is connected with the rubber cylinder, and the first inner channel is communicated with the second inner channel;
the double-passage sealing orifice device comprises a base, a pressure-bearing blocking cover, a sealing joint, a liquid inlet pipe, a liquid injection valve and a liquid discharge valve, wherein two ends of the base are respectively connected with the pressure-bearing blocking cover and a sleeve, and the base is of a sleeve structure with a middle through cavity inside;
The sealing clamping joint is clamped at the openings of the pressure-bearing blocking cover and the base, and the sealing clamping joint can block the middle through cavity; the sealing clamping joint is provided with a liquid passing channel which is communicated with a second inner channel of the perforating gun body through an oil pipe; the pressure-bearing blocking cover is provided with a hollow hole for an external oil pipe to pass through;
the liquid inlet pipe is communicated with the middle through cavity, two pipelines are connected in parallel, and the liquid injection valve and the liquid discharge valve are respectively arranged on the two pipelines;
When the setting assembly and the perforating assembly are put into the casing, annular passages are formed between the outer wall of the rubber cylinder and the inner wall of the casing and between the outer wall of the perforating gun body and the inner wall of the casing; after the oil pipe is inserted into the double-passage sealing orifice device and the sleeve, annular passages are formed between the cavity wall of the middle through cavity of the base and the outer wall of the oil pipe, and between the inner wall of the sleeve (4) and the outer wall of the oil pipe, and are communicated with each other.
Optionally, a step hole is arranged in the ball seat guide head, and the diameter of the plugging ball is between the aperture of the hole with larger diameter and the aperture of the hole with smaller diameter in the step hole; the sieve mesh is arranged at the bottom of the ball seat guide head and is communicated with the hole with the smaller diameter in the step hole.
Optionally, the packing element both ends are provided with first top connection and first lower joint respectively, all be provided with in first top connection and the first lower joint with the through-hole of first interior passageway intercommunication, the ball seat guide head is connected with first lower joint.
Optionally, two ends of the perforating gun body are respectively provided with a second upper joint and a second lower joint, and through holes communicated with the second inner channel are respectively arranged in the second upper joint and the second lower joint.
Optionally, the main body part of the sealing joint is formed by two sections of cylinders, one section is a cylinder, the other section is a cone, and an opening at one end of the base is provided with a conical surface matched with the cone.
Optionally, the sealing joint both ends are connected with third top connection and third lower clutch respectively, all be provided with in third top connection and the third lower clutch with the through-hole of crossing the liquid passageway intercommunication, third top connection is used for connecting oil pipe, and third lower clutch is used for connecting the perforating gun body.
Optionally, the pressure-bearing blocking cover is connected with the base through threads.
Optionally, the base is connected with the sleeve through a flange.
The invention also discloses a fixed-point injection single-seal ring air fluid replacement two-way fracturing method, which adopts the fixed-point injection single-seal ring air fluid replacement two-way fracturing to perform operation and specifically comprises the following steps:
Step 1, connecting the setting assembly, the perforating assembly and the oil pipe, and sending the oil pipe into a casing solid-hollow borehole with a preset depth; connecting the dual-passage sealing orifice device with a sleeve and an oil pipe;
Step 2, closing the liquid injection valve, opening the liquid discharge valve, and injecting clear water through an oil pipe to perform washing Kong Zuoye; after the hole washing is completed, the plugging balls are put into the hole through an oil pipe;
Step 3, setting: adjusting the injection pressure of the oil pipe to enable the rubber cylinder to radially expand to be in contact with the inner wall of the sleeve, so as to realize setting;
step 4, perforating: after setting is completed, perforating fluid is injected into the second inner channel through an oil pipe, and sleeve perforation operation is carried out;
Step 5, fracturing: after perforation is completed, closing the liquid discharge valve, opening the liquid injection valve, and carrying out fracturing operation through simultaneous injection pressure of two paths of oil pipes and annular channels;
And 6, stopping the pump for pressure relief after the fracturing operation of the current stage is completed, closing the liquid injection valve, opening the liquid discharge valve, releasing the pressure of the oil pipe, and recovering the sealing of the rubber cylinder, wherein the sealing ball releases the sealing and the flowback of the sieve holes, and then withdraws the oil pipe of the hole to the next stage position, and repeating the steps 2 to 5.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention combines the sleeve perforation operation and the staged fracturing operation, thereby greatly reducing the complicated construction procedures of multiple access in the independent operation process of conventional sleeve perforation and staged fracturing; the single-stage perforation and fracturing are integrated, the passage and the oil pipe in the drilling sleeve are fully utilized, the single-packer setting fracturing operation is realized, and the use loss of the packer can be reduced by times.
(2) Under the condition of not increasing the bore diameter of the drilling hole, the invention avoids the limitation that the extra loss of the fracturing fluid pressure is difficult to reduce caused by the difficulty in increasing the inner diameter of the conventional fracturing fluid pipe, utilizes the annular space between the sleeve and the fluid pipe as a second fracturing fluid supply passage outside the fluid pipe, under the condition that the inner diameter of the oil pipe is not changed, the area of the fracture fluid supply section is increased, the basis for increasing the fluid supply amount of the fracture fluid is provided, meanwhile, the fluid supply of the annular fracture fluid channel avoids the interception pressure loss of the fracture fluid of the oil pipe through each outlet section, and the fracture effect is improved.
Additional advantages of the invention will be set forth in the description which follows.
Drawings
Fig. 1 is an assembly schematic diagram of a hole of a fixed-point injection single-seal ring air-fluid-filling two-way fracturing device according to an embodiment of the invention.
FIG. 2 is a schematic view of a setting assembly according to an embodiment of the present invention.
FIG. 3 is a schematic illustration of a perforation assembly according to an embodiment of the present invention.
FIG. 4 is a schematic view of a dual-passage seal orifice device according to an embodiment of the invention
Fig. 5 is a schematic diagram of staged fracturing operation of the fixed-point injection single-seal ring air-fluid-filling two-way fracturing device according to the embodiment of the invention.
Meaning of each reference numeral in the drawings:
1-setting assembly, 2-perforating assembly, 3-double-passage sealing orifice device, 4-casing, 5-oil pipe, 6-annulus channel, 7-drilling;
The device comprises a rubber cylinder 101, a plugging ball 102, a ball seat guide head 103, a first inner channel 104, a sieve mesh 105, a step hole 106, a first upper joint 107 and a first lower joint 108;
201-perforating gun body, 202-second inner channel, 203-perforating nozzle, 204-second upper connector, 205-second lower connector;
301-base, 302-pressure-bearing blocking cover, 303-sealing clamping joint, 304-liquid inlet pipe, 305-liquid injection valve, 306-liquid discharge valve, 307-middle through cavity, 308-liquid passing channel, 309-hollow port, 310-third upper joint, 311-third lower joint, 312-rotary handle, 313-base flange plate and 314-sleeve flange plate.
Detailed Description
The following detailed description of the preferred embodiments of the invention is provided, but the invention is not limited to the specific embodiments described below, and modifications and equivalent changes can be made by those skilled in the art within the scope of the claims, which are intended to be included in the scope of the invention.
In the description of the invention, unless explicitly stated and limited otherwise, the terms "disposed," "connected," and the like should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; either direct or indirect connection, etc. The specific meaning of the above terms in the present technical solution can be understood by those skilled in the art according to specific circumstances. Unless otherwise indicated, terms of orientation such as "upper, lower, bottom, top" and "inner, outer" are generally defined with reference to the drawing plane of the corresponding drawing figures and are defined with reference to the outline of the corresponding drawing figures.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms also are intended to include the plural forms, and furthermore, it is to be understood that the terms "comprises" and "comprising" and any variations thereof are intended to cover a non-exclusive inclusion, e.g., a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The specific embodiment of the invention discloses a fixed-point injection single-seal ring air fluid-supplementing two-way fracturing device which comprises a setting assembly 1, a perforating assembly 2 and a double-passage sealing orifice device 3 which are sequentially connected as shown in figure 1.
As shown in fig. 2, the setting assembly 1 of this embodiment includes a deformable rubber cylinder 101, a plugging ball 102 and a ball seat guiding head 103, the ball seat guiding head 103 is connected with the rubber cylinder 101, a first inner channel 104 is provided on the rubber cylinder 101, a sieve hole 105 communicating the first inner channel 104 with the outside is provided on the ball seat guiding head 103, the plugging ball 102 plugs the sieve hole 105 after being put into the ball seat guiding head 103, and after the plugging ball 102 plugs the first inner channel 104, the injected pressure makes the rubber cylinder 101 radially expand to contact with the inner wall of the sleeve 4, so as to realize the setting.
The present embodiment realizes the plugging of the plugging balls 102 to the sieve holes 105 by the following structure, specifically: the ball seat guide head 103 is internally provided with a step hole 106, the diameter of the plugging ball 102 is between the aperture of a larger-diameter hole in the step hole 106 and the aperture of a smaller-diameter hole, the sieve holes 105 are arranged at the bottom of the ball seat guide head 103 and are communicated with a smaller-diameter hole in the step hole 106, and thus the plugging ball 102 can be just clamped at the step of the step hole 106 after being put into the ball seat guide head 103 to plug the sieve holes 105 at the head of the ball seat guide head 103. When the external pressure changes, the sealing ball 102 can be extruded to move in the step hole, so that the step hole is sealed or unsealed. Preferably, the step of the step hole 106 is set to be an arc surface matched with the spherical surface of the plugging ball 102, so as to achieve better plugging effect.
The ball seat guiding head 103 is a cylinder with a hemispherical head, and the sieve holes 105 are radially distributed on the hemispherical head of the ball seat guiding head 103.
The two ends of the rubber cylinder 101 are respectively provided with a first upper joint 107 and a first lower joint 108, through holes communicated with the first inner channel 104 are respectively arranged in the first upper joint 107 and the first lower joint 108, the first lower joint 108 is used for being connected with the ball seat guide head 103, and the first upper joint 107 is used for being connected with the perforation assembly 2.
As shown in fig. 3, the perforating assembly 2 of the present embodiment includes a perforating gun body 201, a second inner passage 202 is provided on the perforating gun body 201, and a plurality of perforating nozzles 203 are provided around the perforating gun body 201, and the perforating nozzles 203 are communicated with the second inner passage 202. The perforating gun body 201 is connected to the cement 101 and the first inner passage 104 communicates with the second inner passage 202.
A second upper joint 204 and a second lower joint 205 are respectively arranged at two ends of the perforating gun body 201, through holes are respectively arranged in the second upper joint 204 and the second lower joint 205, the through holes are communicated with the second inner channel 202, the second upper joint 204 is connected with the double-passage sealing orifice device 3, and the second lower joint 205 is connected with the first upper joint 107 of the setting assembly 1.
It should be noted that, the perforation nozzles 203 have a certain throttling pressure at the same time, and the pressure is greater than the radial expansion pressure of the extrusion rubber cylinder 101, so that the pressure difference formed by throttling the perforation nozzles when the inner passage is supplied with liquid can ensure that the rubber cylinder realizes expansion setting.
As shown in fig. 4, the dual-path seal orifice device 3 of the present embodiment includes a base 301, a pressure-receiving cover 302, a seal clip 303, a liquid inlet pipe 304, a liquid filling valve 305, and a liquid discharging valve 306.
The two ends of the base 301 are respectively connected with the pressure-bearing blocking cover 302 and the sleeve 4, and the base 301 is of a sleeve structure with a through cavity 307 arranged inside.
The sealing clamping section 303 is clamped at the openings of the pressure-bearing blocking cover 302 and the base 301, the sealing clamping section 303 can seal the middle through cavity 307, specifically, the whole structure of the sealing clamping section 303 is a cylinder with gradually changed diameter, and the maximum diameter of the sealing clamping section 303 is larger than the diameter of the middle through cavity 307. More specifically, the main body of the sealing joint 303 is formed by two sections of cylinders, one section is a cylinder, the other section is a cone, the diameter of the large end of the cone is equal to that of the cylinder, the joint of the cylinder and the cone is integrally formed, and an opening at one end of the base 301 is provided as a conical surface matched with the cone. When the pressure-bearing blocking cover 302 is connected with the base 301, one end of the sealing clamping joint 303 is extruded and propped against the pressure-bearing blocking cover 302, and the other end is extruded and propped against the opening of the base 301, so that the annular space of the oil pipe 5 and the sleeve 4 is sealed. The sealing clamping joint 303 is provided with a liquid passing channel 308, and the liquid passing channel 308 is communicated with the second inner channel 202 of the perforating gun body 201 through the oil pipe 5; the pressure-bearing blocking cover 302 is provided with a hollow 309 for connecting the external oil pipe 5 with the sealing clamping joint 303 after passing through.
The two ends of the sealing clamping joint 303 are respectively connected with a third upper joint 310 and a third lower joint 311, through holes communicated with the liquid passing channel 308 are respectively arranged in the third upper joint 310 and the third lower joint 311, the third upper joint 311 is used for connecting an oil pipe 5, and the third lower joint 311 is used for connecting the perforating gun body 201. In this embodiment, a third upper joint 310 and a third lower joint 311 are respectively disposed on the cylinder and the cone of the sealing joint 303, the third upper joint 310 is connected with the external oil pipe 5, and the third lower joint 311 is connected with the second upper joint 204 of the hole sealing assembly 2.
Preferably, in this embodiment, the pressure-bearing blocking cover 302 is screwed with the base 301; and a rotary handle 312 is arranged on the pressure-bearing blocking cover 302, so that the rotary disassembly and assembly are convenient.
In this embodiment, preferably, a base flange 313 is provided on the base 301, a sleeve flange 314 is provided on the sleeve 4, and the two flanges are connected by bolts and sealed, so as to connect the base 301 and the sleeve 4.
The liquid inlet pipe 304 is communicated with the middle through cavity 307, and the liquid inlet pipe 304 is connected with two pipelines in parallel, and the two pipelines are respectively provided with a liquid injection valve 305 and a liquid discharge valve 306. The liquid inlet pipe 304 in this embodiment is a bent pipe, the end of the bent pipe is connected with a tee, and the other two passages are respectively connected with a liquid injection valve 305 and a liquid discharge valve 306.
When the setting assembly 1 and the perforating assembly 2 are put into the sleeve 4, annular passages 6 are formed between the outer wall of the rubber cylinder 101 and the inner wall of the sleeve 4 and between the outer wall of the perforating gun body 201 and the inner wall of the sleeve 4; when the oil pipe 5 is inserted into the double-passage sealing orifice device 3 and the sleeve 4, annular passages 6 are formed between the cavity wall of the middle through cavity 307 of the base 301 and the outer wall of the oil pipe 5, and between the inner wall of the sleeve 4 and the outer wall of the oil pipe 5, and the annular passages 6 are communicated.
The specific embodiment of the field of the invention also discloses a fixed-point injection single-seal ring air-fluid-filling two-way fracturing method, which adopts the fixed-point injection single-seal ring air-fluid-filling two-way fracturing described in the embodiment of the invention to perform operation and specifically comprises the following steps:
Step 1, connecting a setting assembly 1, a perforating assembly 2 and an oil pipe 5, and sending into a casing solid-hollow borehole with a preset depth; the double-passage sealing orifice device 3 is connected with the sleeve 4 and the oil pipe 5, specifically: the oil pipe is connected with a sealing clamping joint 303 and a pressure-bearing blocking cover 302 of the double-way orifice device, the liquid inlet pipe 304 is connected with a tee joint, and the other two passages of the tee joint are respectively connected with a liquid injection valve 305 and a liquid discharge valve 306 to finish the installation and connection of the double-passage sealing orifice device 3.
Step 2, closing the liquid injection valve 305, opening the liquid discharge valve 306, injecting clean water through the oil pipe 5, and enabling the injected clean water to enter the sleeve 4 along the oil pipe 5, the second inner channel 202, the first inner channel 104 and the sieve holes 105 to perform a hole washing function; after the hole washing is completed, the plugging balls 102 are put into the hole through the oil pipe 5;
step 3, setting: and the injection pressure of the oil pipe 5 is regulated, so that the rubber cylinder 101 radially expands to be in contact with the inner wall of the sleeve 4, and setting is realized.
Step 4, perforating: after setting is completed, perforating fluid is injected into the second inner channel 202 through the oil pipe 5, and sleeve perforation operation is performed; preferably, the perforation liquid is cleaned by directly flushing with clear water after perforation is completed.
Step 5, fracturing: after perforation is completed, a liquid discharge valve 306 is closed, a liquid injection valve 305 is opened, and fracturing operation is carried out through two paths of simultaneous injection pressure of an oil pipe 5 and an annular channel 6;
And 6, after the fracturing operation of the current stage is completed, stopping the pump for pressure relief, closing the liquid injection valve 305, opening the liquid discharge valve 306, releasing the pressure of the oil pipe, and recovering the sealing of the rubber cylinder 101, simultaneously removing the sealing and the flowback of the sieve holes 105 by the sealing balls 102, then withdrawing the oil pipe into the next stage position, and repeating the steps 2 to 5.
On one hand, the invention combines the sleeve perforation operation and the staged fracturing operation, thereby greatly reducing the complicated construction procedures of multiple access holes in the independent operation process of conventional sleeve perforation and staged fracturing; the single-stage perforation and fracturing are integrated, the passage and the oil pipe in the drilling sleeve are fully utilized, the single-packer setting fracturing operation is realized, and the use loss of the packer can be reduced by times. On the other hand, the annular space channel between the sleeve and the oil pipe is used as a second fracturing fluid supply channel outside the oil pipe, the area of the fracturing fluid supply section is increased under the condition that the inner diameter of the oil pipe is not changed, the basis for increasing the fluid supply amount of the fracturing fluid is provided, meanwhile, the annular space fracturing fluid channel supplies fluid, the intercepting pressure loss of the oil pipe for supplying the fracturing fluid through each outlet section is avoided, and the fracturing effect is improved.
Claims (9)
1. The fixed-point injection single-seal ring air fluid-supplementing two-way fracturing device is characterized by comprising a setting assembly (1), a perforating assembly (2) and a double-passage sealing orifice device (3) which are connected in sequence;
The setting assembly (1) comprises a deformable rubber cylinder (101), a plugging ball (102) and a ball seat guide head (103), wherein a first inner channel (104) is arranged on the rubber cylinder (101), the ball seat guide head (103) is connected with the rubber cylinder (101), sieve holes (105) which are communicated with the first inner channel (104) and the outside are formed in the ball seat guide head (103), and the plugging ball (102) plugs the sieve holes (105) after being put into the ball seat guide head (103);
the perforating assembly (2) comprises a perforating gun body (201), wherein a second inner channel (202) and a plurality of perforating nozzles (203) communicated with the second inner channel (202) are arranged on the perforating gun body (201); the perforating gun body (201) is connected with the rubber cylinder (101), and the first inner channel (104) is communicated with the second inner channel (202);
The double-passage sealing orifice device (3) comprises a base (301), a pressure-bearing blocking cover (302), a sealing joint (303), a liquid inlet pipe (304), a liquid injection valve (305) and a liquid discharge valve (306), wherein two ends of the base (301) are respectively connected with the pressure-bearing blocking cover (302) and a sleeve (4), and the base (301) is of a sleeve structure with a middle through cavity (307) arranged inside;
the sealing clamping joint (303) is clamped at the openings of the pressure-bearing blocking cover (302) and the base (301), and the sealing clamping joint (303) can seal the middle through cavity (307); the sealing clamping joint (303) is provided with a liquid passing channel (308), and the liquid passing channel (308) is communicated with the second inner channel (202) of the perforating gun body (201) through an oil pipe (5); a hollow opening (309) for the external oil pipe (5) to pass through is formed in the pressure-bearing blocking cover (302);
the liquid inlet pipe (304) is communicated with the middle through cavity (307), the liquid inlet pipe (304) is connected with two pipelines in parallel, and the liquid injection valve (305) and the liquid discharge valve (306) are respectively arranged on the two pipelines;
When the setting assembly (1) and the perforating assembly (2) are put into the sleeve (4), annular passages (6) are formed between the outer wall of the rubber cylinder (101) and the inner wall of the sleeve (4) and between the outer wall of the perforating gun body (201) and the inner wall of the sleeve (4); after the oil pipe (5) is inserted into the double-passage sealing orifice device (3) and the sleeve (4), annular channels (6) are formed between the cavity wall of the middle through cavity (307) of the base (301) and the outer wall of the oil pipe (5), and between the inner wall of the sleeve (4) and the outer wall of the oil pipe (5), and the annular channels (6) are communicated.
2. The fixed-point injection single-seal ring air fluid-supplementing two-way fracturing device according to claim 1, wherein a step hole (106) is arranged in the ball seat guide head (103), and the diameter of the plugging ball (102) is between the aperture of a larger-diameter hole and the aperture of a smaller-diameter hole in the step hole (106); the sieve holes (105) are arranged at the bottom of the ball seat guide head (103) and are communicated with smaller-diameter holes in the step holes (106).
3. The fixed-point injection single-seal ring air-fluid-supplementing two-way fracturing device according to claim 1, wherein a first upper joint (107) and a first lower joint (108) are respectively arranged at two ends of the rubber cylinder (101), through holes communicated with the first inner channel (104) are respectively arranged in the first upper joint (107) and the first lower joint (108), and the ball seat guide head (103) is connected with the first lower joint (108).
4. The fixed point injection single seal ring air fluid replacement two-way fracturing device according to claim 1, wherein two ends of the perforating gun body (201) are respectively provided with a second upper joint (204) and a second lower joint (205), and through holes communicated with the second inner channel (202) are respectively arranged in the second upper joint (204) and the second lower joint (205).
5. The fixed-point injection single-seal ring air-fluid-supplementing two-way fracturing device according to claim 1, wherein the main body part of the sealing clamping joint (303) is formed by two sections of cylinders, one section is a cylinder, the other section is a cone, and an opening at one end of the base (301) is provided with a conical surface matched with the cone.
6. The fixed-point injection single-seal ring air fluid-filling two-way fracturing device according to claim 1 or 5, wherein two ends of the sealing clamping joint (303) are respectively connected with a third upper joint (310) and a third lower joint (311), through holes communicated with the fluid passing channel (308) are formed in the third upper joint (310) and the third lower joint (311), the third upper joint (311) is used for being connected with an oil pipe (5), and the third lower joint (311) is used for being connected with the perforating gun body (201).
7. The fixed-point injection single-seal ring air fluid-supplementing two-way fracturing device according to claim 1, wherein the pressure-bearing blocking cover (302) is connected with the base (301) through threads.
8. The fixed-point injection single-seal ring air fluid-supplementing two-way fracturing device according to claim 1, wherein the base (301) is connected with the sleeve (4) through a flange.
9. The method is characterized by adopting the fixed-point injection single-seal ring air-fluid-filling two-way fracturing according to any one of claims 1 to 8 for operation, and specifically comprises the following steps:
Step 1, connecting the setting assembly (1), the perforating assembly (2) and the oil pipe (5), and sending the mixture into a casing solid-air borehole with a preset depth; connecting the double-passage sealing orifice device (3) with a sleeve (4) and an oil pipe (5);
step 2, closing the liquid injection valve (305), opening the liquid discharge valve (306), and injecting clear water through the oil pipe (5) to perform washing Kong Zuoye; after the hole washing is completed, the plugging balls (102) are put into the hole through the oil pipe (5);
Step 3, setting: adjusting the injection pressure of the oil pipe (5) to enable the rubber cylinder (101) to radially expand to be in contact with the inner wall of the sleeve (4) so as to realize setting;
Step 4, perforating: after setting is completed, perforating fluid is injected into the second inner channel (202) through the oil pipe (5), and sleeve perforation operation is carried out;
step 5, fracturing: after perforation is completed, closing the liquid discharge valve (306), opening the liquid injection valve (305), and performing fracturing operation by injecting pressure through two paths of oil pipes (5) and annular channels (6) at the same time;
And 6, stopping the pump for pressure relief after the fracturing operation of the current stage is completed, closing the liquid injection valve (305), opening the liquid discharge valve (306), releasing the pressure of the oil pipe, unsealing and recovering the rubber cylinder (101), releasing the plugging and the flowback of the sieve holes (105) by the plugging balls (102), then retracting the oil pipe into the hole to the next stage position, and repeating the steps 2 to 5.
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| CN202211174611.9A CN115506765B (en) | 2022-09-26 | 2022-09-26 | Fixed-point injection single-seal ring air fluid replacement two-way fracturing device and method |
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| CN202211174611.9A CN115506765B (en) | 2022-09-26 | 2022-09-26 | Fixed-point injection single-seal ring air fluid replacement two-way fracturing device and method |
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| CN115506765B true CN115506765B (en) | 2024-10-18 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105696995A (en) * | 2016-01-20 | 2016-06-22 | 中国石油化工股份有限公司 | Tool for pressure stage differential type spraying, setting and fracturing and pipe column comprising same |
| CN105696984A (en) * | 2016-01-20 | 2016-06-22 | 中国石油化工股份有限公司 | Tool used for multidirectional pressure control type spraying-sealing fracturing and tubular column comprising same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7278486B2 (en) * | 2005-03-04 | 2007-10-09 | Halliburton Energy Services, Inc. | Fracturing method providing simultaneous flow back |
| CA2713611C (en) * | 2010-09-03 | 2011-12-06 | Ncs Oilfield Services Canada Inc. | Multi-function isolation tool and method of use |
| US10053968B2 (en) * | 2011-05-26 | 2018-08-21 | Exxonmobil Upstream Research Company | Methods for multi-zone fracture stimulation of a well |
| CA2810139A1 (en) * | 2012-03-22 | 2013-09-22 | Canadian Fracturing Ltd. | Multizone and zone-by-zone abrasive jetting tools and methods for fracturing subterranean formations |
| CN108166965B (en) * | 2018-02-27 | 2023-09-05 | 中国石油集团渤海钻探工程有限公司 | Sand blasting perforation, fracturing and packing integrated device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105696995A (en) * | 2016-01-20 | 2016-06-22 | 中国石油化工股份有限公司 | Tool for pressure stage differential type spraying, setting and fracturing and pipe column comprising same |
| CN105696984A (en) * | 2016-01-20 | 2016-06-22 | 中国石油化工股份有限公司 | Tool used for multidirectional pressure control type spraying-sealing fracturing and tubular column comprising same |
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| CN115506765A (en) | 2022-12-23 |
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