CN110259407B - Mechanical-hydraulic internal locking compression packer - Google Patents
Mechanical-hydraulic internal locking compression packer Download PDFInfo
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- CN110259407B CN110259407B CN201910640875.0A CN201910640875A CN110259407B CN 110259407 B CN110259407 B CN 110259407B CN 201910640875 A CN201910640875 A CN 201910640875A CN 110259407 B CN110259407 B CN 110259407B
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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
- 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
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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
- 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
- E21B33/1265—Packers; Plugs with fluid-pressure-operated elastic cup or skirt with mechanical slips
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
- E21B33/1295—Packers; Plugs with mechanical slips for hooking into the casing actuated by fluid pressure
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Abstract
A machine liquid internal locking type compression packer comprises a cock, a two-stage hydraulic cylinder, a hydraulic lock valve, an inner middle pipe, a central pipe, a lower balance mechanism and a deblocking mechanism, wherein the components are sequentially connected and combined to form a plurality of cavities with independent functions, the cavities are connected into a whole to form a closed cavity, and the closed cavity is arranged between an upper joint and a lower joint and comprises an annular cavity, an upper hydraulic cylinder cavity, a lower balance cavity and a deblocking cavity; the hydraulic lock valve is arranged at the upper joint or the lower joint, and the tooth withdrawing phenomenon of the mechanical lock is solved by utilizing the incompressibility of liquid; the packer also comprises a mechanical internal locking mechanism and a mechanical external locking mechanism which are mutually independent, wherein after one mechanism fails, the other mechanism can continue to work, and the long-term effectiveness is kept; the combination of the two-stage hydraulic cylinder and the mechanical internal and external locking mechanism enables the rubber cylinder to realize secondary bidirectional extrusion, reduces the backspacing of the mechanical internal locking mechanism, and improves the bidirectional alternate bearing capacity of the invention.
Description
Technical Field
The invention belongs to the technical field of petroleum exploitation machinery, and relates to a mechanical-hydraulic internal locking type compression packer.
Background
Well completion, stratified oil production and CO injection in the field of oil exploitation2In other operations, packers are often used to separate oil layers, seal oil jacket annuluses, suspend downhole strings, and the like.
In-situ CO injection2For improving the anti-corrosion effect of packers in wells, e.g. CO-resistance2Corrosion type Y443 packer (application No. 200920170741.9), the purpose of which is to provide CO2Ensuring the sealing of injected gas in injection well and resisting the sameCO2Corrosion, adopting a structural mode of bidirectional slips, hydraulic setting and drilling and milling deblocking; the parts of the product are made of stainless materials, the material cost is high, the processing difficulty is high, the deblocking adopts a drilling and milling mode, the operation time is long, the working procedures are multiple, and the cost is high.
In order to improve the sealing effect of the packer, for example, in a three-force two-way compression type hydraulic packer (application number 201520848467.1), two hydraulic cylinder locking mechanisms are designed to jointly load hydraulic force from the upper direction and the lower direction of a slip, and the hydraulic force and the mechanical pressing load of an upper pipe column compress a rubber sleeve, so that the sealing effect of the packer is more ideal. The existing defects are as follows: the single-stage oil cylinder is adopted for seat sealing, the compression force is small, the seat sealing pressure is high, and the sealing and anchoring are unstable; the two hydraulic cylinder locking mechanisms are both in a tooth meshing structure, and the phenomenon of tooth withdrawal exists after seat sealing pressure relief; the published related technical document 'development of bidirectional three-force loading gas injection packer' shows that the rubber sleeve retreats by 1.7mm, and the thrust of the forcing end is reduced by 60%; if the rubber sleeve is compressed by the weight of the pipe column, the compression force lost by tooth withdrawal is compensated, but the loading load is limited by well deviation and is unstable.
Disclosure of Invention
The present invention has been made to solve at least one of the above problems, and an object of the present invention is to provide a compression packer of an internal mechanical-hydraulic lock type.
The technical scheme of the application is a machine liquid internal locking type compression packer, which is characterized by comprising a cock, a two-stage hydraulic cylinder, a hydraulic lock valve, an inner middle pipe, a central pipe, a lower balance mechanism and a deblocking mechanism, wherein the orderly connection and combination of the components sequentially form a plurality of cavities with independent functions, the cavities are connected into a whole to form a closed cavity, the closed cavity is arranged between an upper joint and a lower joint, wherein,
the closed cavity comprises an annular cavity, an upper hydraulic cylinder cavity, a lower balance cavity and an unsealing cavity;
an upper liquid inlet hole is formed in the upper joint, a lower liquid inlet hole is formed in the lower joint, and an oil sleeve communication hole is formed in the upper joint;
lubricating oil and an anti-corrosion medium are filled or injected into the closed cavity through unscrewing the cock or the upper liquid inlet hole of the liquid lock valve;
the two-stage hydraulic cylinder comprises an upper piston, an upper hydraulic cylinder, a lower piston, a lower cylinder sleeve, a central pipe, a rubber middle pipe and a rubber pin; the glue middle pipe and the lower cylinder sleeve are fixed into a whole by a glue feeding pin to form a lower hydraulic cylinder.
Preferably, the liquid locking valve is arranged at the upper joint or the lower joint and comprises a liquid inlet piston, a sealing ring, a spring and a spring seat in a deviation hole of the upper joint or the lower joint.
Preferably, the cock is arranged on the radial outer wall of the upper piston, which is communicated with the annular cavity, and is in threaded sealing connection; or the upper hydraulic cylinder is arranged on the radial outer wall of the cavity leading to the upper hydraulic cylinder and is in threaded sealing connection; or the slip lower seat is arranged on the radial outer wall of the lower balance cavity communicated with the slip lower seat and is in threaded sealing connection; or the lower joint is arranged on the outer side of the end, which leads to the unsealing cavity, of the lower joint and is in threaded sealing connection.
Preferably, the mechanical-hydraulic internal lock type compression packer comprises a mechanical lock, the mechanical lock comprises a mechanical internal lock and a mechanical external lock, the mechanical internal lock and the mechanical external lock can work independently, the mechanical internal lock comprises a central tube, a rubber middle tube, an internal clamp spring and a clamp spring sleeve, and the mechanical external lock comprises an upper piston, a clamp spring sleeve, an upper hydraulic cylinder and a C-shaped clamp spring.
Preferably, the mechanical-hydraulic internal locking compression packer further comprises a sealing and anchoring assembly, the sealing and anchoring assembly comprises a dynamic pressure ring, a rubber seat pin, an upper taper sleeve, an outer slip, a shoe seat pin, a lower cylinder sleeve and a rubber cylinder, and the sealing and anchoring assembly moves step by step under the pushing of the two-stage hydraulic cylinder and sequentially comprises the following steps: (1) the bush seat pin is cut off, the outer slip radially extends out along the inclined plane to be anchored with the inner wall of the sleeve under the pushing of the upper taper sleeve, (2) the rubber seat pin is cut off, the compression sealing rubber cylinder deforms under the pushing of the dynamic pressure ring to contact with the inner wall of the sleeve to form sealing, and (3) the upper rubber pin is cut off, and the lower cylinder sleeve compresses the sealing rubber cylinder from the other side under the pushing of the upper hydraulic cylinder.
Preferably, the mechanical-hydraulic internal locking compression packer further comprises a lower balance mechanism, the lower balance mechanism is arranged at the bottom end of the sealing and anchoring assembly, the lower balance mechanism comprises a slip lower seat, a central pipe and a lower supporting seat, and the slip lower seat, the central pipe and the lower supporting seat form a lower balance cavity.
Preferably, this machine liquid internal lock type compression packer still includes deblocking mechanism, deblocking mechanism includes top connection, deblocking pin, interior well pipe, slips lower carriage, locking piece support, locking piece, lock tube and lower clutch or lock tube joint down.
Preferably, the mechanical-hydraulic internal locking compression packer further comprises an oil unloading mechanism, wherein the oil unloading mechanism comprises an oil sleeve communication hole of the upper joint, a sealing ring and an upper piston.
Preferably, the hydraulic lock valve, the mechanical inner lock and the mechanical outer lock can work independently, and the hydraulic lock valve, the mechanical inner lock and the mechanical outer lock can be respectively combined and arranged.
The mechanical-hydraulic internal locking type compression packer comprises two sets of mechanical-hydraulic locking mechanisms and two-stage hydraulic cylinders which are mutually independent, and the two-stage hydraulic cylinders are in the same direction and synchronous and respectively apply thrust to slips and a rubber sleeve to complete one-time setting; the upper hydraulic cylinder is pressurized again to compress the rubber cylinder from the other side of the rubber cylinder and is locked, the tooth back distance during primary seat sealing is compensated, secondary seat sealing is formed, bidirectional compression of the rubber cylinder is realized, and the reliability of sealing is greatly improved; a liquid lock valve is arranged at a liquid inlet of the annular cavity, the seat seal is quickly closed after pressure relief, a liquid lock is formed, and the tooth withdrawing phenomenon of a mechanical lock is solved by utilizing the incompressibility of liquid; lubricating oil can be filled in the annular cavity, so that the reliability of the tool in long-term underground work is ensured, and the influence of corrosion and scaling on the reliability of the tool is solved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of the structure at A in FIG. 1;
FIG. 3 is an enlarged view of the structure at B in FIG. 1;
FIG. 4 is an enlarged view of the structure at C in FIG. 1;
FIG. 5 is a schematic view of the structure of the lower joint of the forced deblocking mechanism;
fig. 6 is a schematic view of the structure of the hydraulic lock valve at the lower joint.
Detailed Description
The invention is further illustrated by the following figures and examples.
The invention provides a machine-liquid internal-locking compression packer, which comprises a cock 9, a two-stage hydraulic cylinder, a hydraulic lock valve, an inner middle pipe 13, a central pipe 19, a lower balance mechanism and an unsealing mechanism, wherein the components are sequentially connected and combined to form a plurality of cavities with independent functions, the cavities are connected into a whole to form a closed cavity, the closed cavity is arranged between an upper joint 1 and a lower joint 39, wherein,
the closed cavity comprises an annular cavity 40, an upper cylinder cavity 41, a lower cylinder cavity 42, a lower balance cavity 43 and an unsealing cavity 44;
an upper liquid inlet hole 1-2 is formed in the upper connector 1, a lower liquid inlet hole 39-3 is formed in the lower connector 39, and an oil sleeve communication hole 1-1 is formed in the upper connector 1;
lubricating oil and an anti-corrosion medium are filled or injected into the closed cavity through unscrewing the cock 9 or the upper liquid inlet hole 1-2 of the liquid lock valve;
a gap is reserved between the upper joint 1 and the upper piston 12 to form an annular cavity 40, an unsealing cavity 44 is arranged at the lower joint 39, and a liquid lock valve is arranged on one side of the annular cavity 40 or the unsealing cavity 44;
the double-stage hydraulic cylinder comprises an upper piston 12, an upper hydraulic cylinder 14, a lower piston 16, a lower cylinder sleeve 18, a central pipe 19, a rubber middle pipe 20 and a rubber pin 21; the outer surface of the cock 9 is provided with a second O-shaped sealing ring 5, the cock 9 is in threaded connection with the upper piston 12, and the second O-shaped sealing ring 5 is positioned between the outer surface of the cock and the inner wall of the upper piston 12;
one end of an upper piston 12 is connected with an upper connector 1, the other end of the upper piston is sleeved in an upper hydraulic cylinder 14, a fourth O-shaped sealing ring 15 is arranged between the upper piston 12 and the upper hydraulic cylinder 14, and the fourth O-shaped sealing ring 15 forms a seal between the upper piston 12 and the upper hydraulic cylinder 14;
a fifth O-shaped sealing ring 17 is arranged in the upper hydraulic cylinder 14, and the fifth O-shaped sealing ring 17 is arranged between the upper hydraulic cylinder 14 and the lower piston 16 to form sealing between the upper hydraulic cylinder 14 and the lower piston 16;
one end of an upper piston 12 sleeved in an upper hydraulic cylinder 14 is connected with one end of a lower piston 16 through threads, a lower piston liquid inlet 16-1 is formed in the lower piston 16, the other end of the lower piston 16 is connected with a lower cylinder sleeve 18 through an external fourth O-shaped sealing ring 15, one end of a rubber middle pipe 20 is also connected with the lower cylinder sleeve 18 through the external fourth O-shaped sealing ring 15, the inner side of one end of the lower piston 16 connected with the lower cylinder sleeve 18 is further connected with a central pipe 19 through threads, and an upper cylinder cavity 41 is formed between one end of the upper piston 12 sleeved in the upper hydraulic cylinder 14 and the lower piston 16;
the central tube 19 is provided with a first central tube liquid inlet 19-1 and a second central tube liquid inlet 19-3, and the outer ring of the central tube 19 is sleeved with a rubber central tube 20;
the rubber middle tube 20 and the lower cylinder sleeve 18 are fixed through an upper rubber pin 21 to form a lower hydraulic cylinder, the rubber middle tube 20 is connected with the central tube 19 through a built-in fifth O-shaped sealing ring 17, the fifth O-shaped sealing ring forms sealing between the rubber middle tube 20 and the central tube 19, and a lower cylinder cavity 42 is formed between one end of a lower piston 16 connected with the central tube and the central tube 19 and the rubber middle tube 20.
As a preferred scheme, the liquid lock valve includes an upper joint 1 or is arranged at a lower joint as shown in fig. 6, and specifically includes a liquid inlet piston 3 in a biased hole of the lower joint 39, a spring 6 and a spring seat 8, the outer surface of the liquid inlet piston 3 is provided with a second O-ring 5, the second O-ring 5 seals between the liquid inlet piston 3 and the upper joint 1 or between the liquid inlet piston and the lower joint 39, the liquid inlet piston 3 and the spring seat 8 are respectively arranged at two ends in the biased hole, one end of the spring 6 is connected with one end of the liquid inlet piston 3, the other end of the spring 6 is connected with the spring seat 8, the spring seat 8 is in threaded connection with the end of the biased hole, and the liquid inlet piston 3 is provided with a liquid inlet.
As a preferable scheme, the mechanical-hydraulic internal locking type compression packer comprises a mechanical lock, wherein the mechanical lock comprises a mechanical internal lock and a mechanical external lock, and the mechanical internal lock and the mechanical external lock can work independently; the mechanical inner lock comprises a central tube 19, a rubber-in-tube 20, an inner clamp spring 27 and a clamp spring sleeve 28, the rubber-in-tube 20 and the clamp spring sleeve 28 are sequentially arranged on the outer ring of the central tube 19 from top to bottom, the rubber-in-tube 20 is in threaded connection with the clamp spring sleeve 28, a first annular space is formed between the rubber-in-tube 20 and the clamp spring sleeve 28, the inner clamp spring 27 is arranged in the first annular space, the inner clamp spring 27 can be radially expanded, central tube external inverted teeth 19-2 are arranged on the central tube 19, inner teeth of the inner clamp spring 27 are matched and meshed with the central tube external inverted teeth 19-2, the rubber-in-tube 20 pushes the inner clamp spring 27 to move, the inner teeth of the inner clamp spring 27 are meshed with the central tube external inverted teeth 19-2, and an inner inclined surface;
the mechanical external lock comprises an upper piston 12, a clamp spring sleeve 11, an upper cylinder 14 and a C-shaped clamp spring 10, wherein the clamp spring sleeve 11 and the upper cylinder 14 are sequentially sleeved on the outer ring of the upper piston 12 from top to bottom, the clamp spring sleeve 11 is in threaded connection with the upper cylinder 14, a second annular space is formed between the clamp spring sleeve 11 and the upper cylinder 14, the C-shaped clamp spring 10 is arranged in the second annular space, the C-shaped clamp spring 10 can be radially expanded, an upper piston outer inverted tooth 12-1 is arranged on the upper piston 12, the inner tooth of the C-shaped clamp spring 10 is matched and meshed with the upper piston outer inverted tooth 12-1, when the upper cylinder 14 runs, the clamp spring sleeve 11 drives the C-shaped clamp spring 10 to move, the inner tooth of the C-shaped clamp spring 10 is meshed with the outer inverted tooth 12-1 on the upper piston 12, and the C-.
As a preferred scheme, the mechanical hydraulic internal locking type compression packer further comprises a sealing and anchoring assembly, the sealing and anchoring assembly is arranged at the bottom end of the double-stage hydraulic cylinder, the sealing and anchoring assembly comprises a lower cylinder sleeve 18, a central pipe 19, a rubber-filled pipe 20, a first spacer ring 23-1, a second spacer ring 23-2, a dynamic pressure ring 24, a rubber base pin 25, an upper taper sleeve 26, a snap spring sleeve 28, a shoe base pin 29, a connecting pin 30, an outer slip sleeve 31, a leaf spring 32, an outer slip 33, a rubber cylinder, a screw 34 and a slip lower seat 35, and the rubber cylinder comprises a first rubber cylinder 22-1, a second rubber cylinder 22-2 and a third rubber cylinder 22-3;
the outer ring of the rubber middle pipe 20 is sequentially sleeved with a first rubber cylinder 22-1, a first spacer ring 23-1, a second rubber cylinder 22-2, a second spacer ring 23-2, a third rubber cylinder 22-3, a dynamic pressure ring 24 and an upper taper sleeve 26 from top to bottom, a clamp spring sleeve 28 is in threaded connection with the bottom end of the rubber middle pipe 20, the axial movement of the dynamic pressure ring 24 is controlled, and the clamp spring sleeve 28 is fixedly connected with the upper taper sleeve 26 through a rubber base pin 25;
the dynamic pressure ring 24 is in threaded connection with one end of the upper taper sleeve 26, the outer slip 33 is fixed with the leaf spring 32 through the screw 34 and then is placed into the outer slip sleeve 31, the outer slip 33 is sleeved on the central pipe 19, one end of the outer slip sleeve 31 is connected with the other end of the upper taper sleeve 26 through the slip seat pin 29 and the connecting pin 30, and the other end of the outer slip sleeve 31 is connected with the slip lower seat 35 through the connecting pin 30.
The sealing and anchoring assembly acts step by step under the push of the two-stage hydraulic cylinder, and the steps are as follows: firstly, the bush seat pin 29 is cut off, the outer slip 33 radially extends out along the inclined plane under the pushing of the upper taper sleeve 26 and is anchored with the inner wall of the sleeve, secondly, the rubber seat pin 25 is cut off, the compression sealing rubber sleeve is deformed under the pushing of the dynamic pressure ring 24 and contacts with the inner wall of the sleeve to form sealing, thirdly, the upper rubber pin 21 is cut off, and the lower cylinder sleeve 18 compresses the sealing rubber sleeve from the other side under the pushing of the upper hydraulic cylinder 14.
As a preferred scheme, the mechanical-hydraulic internal locking compression packer further comprises a lower balance mechanism, the lower balance mechanism is arranged at the bottom end of the sealing and anchoring assembly, the lower balance mechanism comprises a slip lower seat 35, a central pipe 19 and a lower supporting seat 36, and the slip lower seat 35, the central pipe 19 and the lower supporting seat 36 form a lower balance cavity 43;
one end of the slip lower seat 35 is internally provided with a fifth O-shaped sealing ring 17 which is in sealing fit with the central pipe 19, the other end of the slip lower seat is in sealing fit with a lower supporting seat 36 of an externally arranged fourth O-shaped sealing ring 15, the lower supporting seat 36 is in threaded connection with the bottom end of the central pipe 19, the lower supporting seat 36 is sleeved in the slip lower seat 35, the lower balance cavity 43 is communicated with a second liquid inlet 19-3 of the central pipe, and the bottom end of the slip lower seat 35 is provided with a lower lock.
As a preferred solution, the tap 9 is arranged on the radially outer wall of the upper piston 12, which opens into the annular chamber 40, screwed in a sealed connection; or the upper hydraulic cylinder 14 is arranged on the radial outer wall leading to the upper hydraulic cylinder cavity 41 and is in threaded sealing connection; or the slip lower seat is arranged on the radial outer wall of the lower balance cavity 43 which is communicated with the slip lower seat, and the slip lower seat is in threaded sealing connection; or on the outside of the end of the lower joint 39 leading to the deblocking cavity 44, and is screwed and sealed. In this embodiment, the tap is arranged on the radial outer wall of the cavity 40, which is open to the upper piston 12, and the thread is sealed, and the tap 9 is arranged at the top end of the cavity 40, and the cavity 40 is filled with lubricating oil by unscrewing the tap 9.
As a preferable scheme, the mechanical-hydraulic internal-locking compression packer further comprises an unsealing mechanism, wherein the unsealing mechanism comprises an upper joint 1, an unsealing pin 4, a first O-ring 2, a third O-ring 7, an inner middle pipe 13, a lower lock sleeve joint 45, a lock block support 46 and a lower joint 39; sequentially assembling a two-stage hydraulic cylinder, a sealing and anchoring assembly, a machine liquid locking mechanism and a lower balance mechanism into a whole; an upper joint 1 with an internal O-shaped sealing ring 2 penetrates into an inner hole after being in threaded connection with an inner middle pipe 13, an external O-shaped sealing ring 7 of the upper joint 1 is in matched connection with an upper piston 12, a lower joint 39 with the internal O-shaped sealing ring 2 is in threaded connection with the inner middle pipe 13 to support a locking block 38, the external O-shaped sealing ring 7 of the lower joint 39 is in sealed matching with a lower supporting seat 36, a slip lower seat 35 is in threaded connection with a lower locking sleeve 37 and locks the locking block 38, an inner inclined surface of the lower locking sleeve 37 is in contact with an outer inclined surface 39-2 of the lower joint 39, and an upper piston 12 and the upper joint 1 are fixed by a deblocking pin 4 and are integrally fixed between the upper joint 1 and the. The scheme has the advantages that: (1) the thrust of an oil cylinder is balanced by using the inner cavity of the slip lower seat 35, so that the bearing capacity of the locking block 38 is reduced, and the deblocking reliability is improved; (2) the deblocking pin 4 only bears the shearing force of the lifting pipe column, so that the fatigue damage caused by the circulating stress is solved, the underground service life is prolonged, and the reliability of the packer is improved.
FIG. 5 is a forced deblocking mechanism capable of replacing the structure shown in FIG. 4, the deblocking mechanism includes an upper joint 1 screwed to an inner-middle pipe 13 through an internal first O-ring 2, the inner-middle pipe 13 is disposed inside a lower piston 16 and a central pipe 19 and penetrates the upper piston 16 and the central pipe 19, an external third O-ring 7 of the upper joint 1 is connected to an upper piston 12, an internal first O-ring 2 of a locking block support 46 is screwed to the inner-middle pipe 13, a locking block 38 is disposed on the locking block support 46, the locking block support 46 is used for supporting the locking block 38, the external third O-ring 7 of the locking block support 46 is hermetically matched with a lower support 36, a slip lower support 35 is screwed to a lower lock sleeve joint 45 and locks the locking block 38, the internal O-ring 2 of the lower lock sleeve joint 45 is hermetically matched with an extended annular surface 46-2 of the locking block support 46, a deblocking pin 4 fixes the upper piston 12 to the upper joint 1, and a sealing and anchoring assembly is disposed between the upper joint 1 and the locking block support 46, the locking piece support body 46 is provided with a different-diameter groove 46-1, and an unsealing cavity 44 is arranged between the lower support seat 36 and the locking piece support body 46. The scheme has the advantages that after the deblocking pin 4 is cut, the lower tubular column drives the lower lock sleeve joint 45, the slip lower seat 35, the sealing and anchoring assembly, the mechanical-hydraulic locking and lower cylinder sleeve 18 to directly descend, and deblocking is reliable; the defect is that the shear load of the deblocking pin 4 needs to be matched with the weight of a lower pipe column, shearing in the well descending process is prevented, and the shear load of the deblocking pin 4 is large.
As a preferable mode, the mechanical-hydraulic internal locking compression packer further comprises an oil unloading mechanism, the oil unloading mechanism comprises an upper joint 1, an upper piston 12 and a fourth O-shaped sealing ring 15, and grooves at two ends of an oil sleeve connecting through hole 1-1 in the upper joint 1 are sealed with the upper piston 12 in a matched mode through the fourth O-shaped sealing ring 15.
The hydraulic lock valve, the mechanical inner lock and the mechanical outer lock in the embodiment can work independently and respectively, or can be arranged in a combined mode of any two mechanisms, after one mechanism fails, the other mechanism can work continuously, and long-term effectiveness of the locking mechanism is kept;
the hydraulic lock valve is quickly closed to form a hydraulic lock, and due to the incompressibility of liquid, the tooth withdrawing phenomenon of a mechanical lock is avoided; the hydraulic lock valve has simple structure, easy manufacture and no interference with the mechanical locking mechanism during working, the adding method of the lubricating oil in the annular cavity is simple, and the modes of filling, low-pressure filling and the like can be adopted;
lubricating oil or anticorrosive liquid is injected into the annular cavity 40, and can be made of common materials, the surface of each working cavity is not contacted with corrosive media, and the matching surface is not scaled or corroded; the reliability of separation and anchoring is improved, and the reliability of the unsealing action of each mechanism is solved.
The combination of the two-stage hydraulic cylinder and the mechanical lock is used, so that the rubber cylinder realizes secondary bidirectional extrusion, the backspacing of the mechanical internal locking mechanism is reduced, and the bidirectional alternate bearing capacity of the invention is improved; the secondary seat sealing is compressed by a hydraulic cylinder, the pressing force is stable and reliable, and the capability of adapting to well deviation is improved.
When the packer is set, pressure fluid enters an annular cavity 40 through an upper fluid inlet hole 1-2 of an upper connector 1 or a lower fluid inlet hole 39-3 of a lower connector 39 and a fluid inlet groove 3-1 of a fluid lock valve, and respectively enters an upper cylinder cavity 41, a lower cylinder cavity 42, a lower balance cavity 43 and an unsealing cavity 44 through a lower piston fluid inlet hole 16-1, a first central tube liquid inlet 19-1 and a second central tube liquid inlet 19-3, the unsealing mechanism keeps balance under the action of the annular cavity 40 and the unsealing cavity 44, the upper cylinder 14 and the lower cylinder push the sealing mechanism to move integrally under the hydraulic action, a tile seat pin 29 is firstly cut under the action of an upper taper sleeve 26, an outer tile 33 radially extends out to be in contact with the inner wall of the sleeve to form anchoring under the pushing action of a taper surface of the upper taper sleeve 26, the pressure continues to rise, a rubber seat pin 25 is cut, a dynamic pressure ring 24 moves upwards to compress a third rubber sleeve 22-3, The second rubber cylinder 22-2 and the first rubber cylinder 22-1 are deformed and then contacted with the inner wall of the sleeve to form sealing, the rubber middle tube 20 pushes the inner snap spring 27 to move forwards and is meshed with the outer inverted tooth 19-2 of the central tube 19 to realize mechanical inner locking, the snap spring sleeve 11 drives the C-shaped snap spring 10 to move, the inner tooth of the C-shaped snap spring 10 is meshed with the outer inverted tooth 12-1 of the upper piston on the upper piston 12 to realize mechanical outer locking, and the movable press ring 24 is stopped when compressing the rubber cylinder to the position 20-1; the pressure is continuously increased, the upper hydraulic cylinder 14 pushes the lower cylinder sleeve 18 to move forwards, the upper rubber seat pin 21 is sheared and then compresses the rubber cylinder, the mechanical outer lock is meshed forwards, the seat sealing is finished after the pressure is stabilized for a certain time when the pressure is increased to a designed value, the liquid inlet piston 3 in the liquid lock valve after pressure relief is rapidly recovered and closed under the action of the spring 6 and hydraulic force to form a liquid lock, and the positions of the mechanical inner lock, the mechanical outer lock, the upper oil cylinder, the lower oil cylinder and the like are kept unchanged.
The deblocking process comprises lifting the tool, contacting the assembly of the two-stage hydraulic cylinder, the sealing and anchoring assembly and the lower balance mechanism with the casing, moving the inner clamp spring 27 upwards under the drive of the outer inverted tooth 19-2 of the central tube 19, removing the locking force of the inner conical surface 28-1 of the clamp spring sleeve 28 by the inner clamp spring 27, expanding the inner clamp spring 27, causing the inner central tube 13, i.e. the deblocking mechanism, to displace relative to the main bodies of the two-stage hydraulic cylinder, the sealing and anchoring assembly and the lower balance mechanism, cutting off the deblocking pin 4, moving the deblocking mechanism upwards, allowing the O-ring at the upper end of the lower joint 39 to enter the large annular hole 36-1 to lose sealing, allowing the high-pressure mixed liquid in the sealed cavity to enter the annular space of the oil jacket, allowing the locking block 38 to fall into the different-diameter groove 39-1 of the lower joint 39, opening the communicating hole 1-1 of the oil jacket, allowing the slips lower seat 35 to descend under the support, the outer slips 33 are driven by the connecting pin 30 and the outer slip sleeve 31 to move upwards under the recovery force of the rubber cylinder 22, and are separated from the upper conical surface of the slip lower seat 35, and the outer slips 33 are recovered under the action of the leaf spring 32, so that deblocking is realized.
The above description is only for the purpose of illustrating preferred embodiments of the present invention and is not to be construed as limiting the present invention, and the terms first, second, etc. are used for distinguishing between similar terms and not for limiting the technical terms, and various modifications and variations of the present invention may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A machine liquid internal locking type compression packer is characterized by comprising a cock, a two-stage hydraulic cylinder, a hydraulic lock valve, an inner middle pipe, a central pipe, a lower balance mechanism and a deblocking mechanism, wherein the components are sequentially connected and combined to form a plurality of cavities with independent functions, the cavities are connected into a whole to form a closed cavity, the closed cavity is arranged between an upper joint and a lower joint, wherein,
the closed cavity comprises an annular cavity, an upper hydraulic cylinder cavity, a lower balance cavity and an unsealing cavity;
an upper liquid inlet hole is formed in the upper joint, a lower liquid inlet hole is formed in the lower joint, and an oil sleeve communication hole is formed in the upper joint;
lubricating oil and an anti-corrosion medium are filled or injected into the closed cavity through unscrewing the cock or the upper liquid inlet hole of the liquid lock valve;
the two-stage hydraulic cylinder comprises an upper piston, an upper hydraulic cylinder, a lower piston, a lower cylinder sleeve, a central pipe, a rubber middle pipe and a rubber pin; the rubber middle pipe and the lower cylinder sleeve are fixed into a whole by an upper rubber pin to form a lower hydraulic cylinder;
the liquid locking valve is arranged at the upper joint or the lower joint and comprises a liquid inlet piston, a sealing ring, a spring and a spring seat which are arranged in a deviation hole of the upper joint or the lower joint;
the mechanical-hydraulic internal lock type compression packer further comprises a mechanical lock, wherein the mechanical lock comprises a mechanical internal lock and a mechanical external lock, the mechanical internal lock and the mechanical external lock can work independently, the mechanical internal lock comprises a central tube, a rubber central tube, an internal clamp spring and a clamp spring sleeve, and the mechanical external lock comprises an upper piston, a clamp spring sleeve, an upper hydraulic cylinder and a C-shaped clamp spring;
the hydraulic lock valve, the mechanical inner lock and the mechanical outer lock can work independently, and the hydraulic lock valve, the mechanical inner lock and the mechanical outer lock can be respectively combined.
2. A compression packer of the mechanically-hydraulically-interlocked type according to claim 1, wherein the plug is provided on a radially outer wall of the upper piston opening into the annular chamber, and is in threaded sealing engagement; or the upper hydraulic cylinder is arranged on the radial outer wall of the cavity leading to the upper hydraulic cylinder and is in threaded sealing connection; or the slip lower seat is arranged on the radial outer wall of the lower balance cavity communicated with the slip lower seat and is in threaded sealing connection; or the lower joint is arranged on the outer side of the end, which leads to the unsealing cavity, of the lower joint and is in threaded sealing connection.
3. The mechanical-hydraulic internal-locking compression packer as recited in claim 1, further comprising a sealing and anchoring assembly, the sealing and anchoring assembly includes a dynamic pressure ring, a rubber seat pin, an upper taper sleeve, an outer slip, a shoe pin, a lower cylinder sleeve and a rubber cylinder, the sealing and anchoring assembly operates step by step under the push of the two-stage hydraulic cylinder, and the operations are sequentially: (1) the bush seat pin is cut off, the outer slip radially extends out along the inclined plane to be anchored with the inner wall of the sleeve under the pushing of the upper taper sleeve, (2) the rubber seat pin is cut off, the compression sealing rubber cylinder deforms under the pushing of the dynamic pressure ring to contact with the inner wall of the sleeve to form sealing, and (3) the upper rubber pin is cut off, and the lower cylinder sleeve compresses the sealing rubber cylinder from the other side under the pushing of the upper hydraulic cylinder.
4. The compression packer of claim 1, further comprising a lower balance mechanism disposed at a bottom end of the sealing and anchoring assembly, wherein the lower balance mechanism comprises a lower slip seat, a center tube, and a lower support seat, and the lower slip seat, the center tube, and the lower support seat form a lower balance chamber.
5. The compression packer of any one of claims 1-4, further comprising a deblocking mechanism, wherein the deblocking mechanism comprises an upper joint, a deblocking pin, an inner middle pipe, a lower slip seat, a locking block support, a locking block, a lower locking sleeve, and a lower joint or a lower locking sleeve joint.
6. The compression packer of the mechanical-hydraulic internal lock type according to claim 1, further comprising an oil discharge mechanism, wherein the oil discharge mechanism comprises an oil jacket communication hole of an upper joint, a seal ring and an upper piston.
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| CN201910640875.0A CN110259407B (en) | 2019-07-16 | 2019-07-16 | Mechanical-hydraulic internal locking compression packer |
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| CN201910640875.0A CN110259407B (en) | 2019-07-16 | 2019-07-16 | Mechanical-hydraulic internal locking compression packer |
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| CN110259407B true CN110259407B (en) | 2021-06-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112943153B (en) * | 2019-12-11 | 2022-10-04 | 中国石油天然气股份有限公司 | But deblocking doublestage hydraulic cylinder formula linkage |
| CN111734340B (en) * | 2020-08-05 | 2020-11-06 | 东营市正能石油科技有限公司 | Integrated packer for oil field exploitation |
| CN115637952B (en) * | 2022-11-11 | 2024-04-30 | 中国石油天然气股份有限公司 | Gas injection double-seal packer and method |
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