CN112228001B - Packer with low setting force and low unsetting force - Google Patents
Packer with low setting force and low unsetting force Download PDFInfo
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- CN112228001B CN112228001B CN202011014829.9A CN202011014829A CN112228001B CN 112228001 B CN112228001 B CN 112228001B CN 202011014829 A CN202011014829 A CN 202011014829A CN 112228001 B CN112228001 B CN 112228001B
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- 238000005406 washing Methods 0.000 claims abstract description 20
- 238000012856 packing Methods 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims description 28
- 239000007788 liquid Substances 0.000 claims description 14
- 238000011010 flushing procedure Methods 0.000 claims description 13
- 239000011229 interlayer Substances 0.000 abstract description 3
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The utility model provides a packer of low deblocking power of low setting power, relates to oil field downhole tool technical field, hang and set up a mechanism including top connection, lower clutch, center tube, well washing piston cover, packing element, bushing pipe, jump ring, top connection and lower clutch are respectively through threaded connection at the upper and lower both ends of center tube, and well washing piston, bushing pipe, jump ring are hung and are set up the mechanism and install the outside at the center tube according to from the top down order, well washing piston cover sets up the outside at well washing piston, be provided with the well washing passageway between bushing pipe and the center tube, the packing element cover is in the outside of bushing pipe. The invention adopts a double-cylinder design (namely two setting pistons are arranged), and by adopting the structure, the effective pressure-bearing area of the setting piston is twice of that of the original one, so that the setting thrust is greatly improved, and the capacity of a rubber cylinder for bearing the interlayer pressure difference is improved.
Description
Technical Field
The invention belongs to the technical field of oil field downhole tools, and particularly relates to a packer with low setting force and low unsetting force.
Background
The compression packer is key equipment in oil field production, and the structure of this kind of packer includes center tube, packing element and sets seals the mechanism, and packing element and setting mechanism all suit are in the outside of center tube. During the use, through to the intraductal setting piston motion that drives of hitting in the center of center seal mechanism, compress the packing element then, make the external diameter increase of packing element until it closely laminates on intraductal wall of cover to accomplish the setting of packing element. In a compression packer, the setting thrust which can be generated by a setting mechanism directly influences the capacity of the packer for bearing the interlayer pressure difference, the setting thrust is mainly determined by the effective pressure bearing area of a setting piston, and the larger the effective pressure bearing area is, the larger the setting thrust which can be generated by the setting mechanism is. In practice, the effective pressure-bearing area of the setting piston is limited by the installation space, even if the effective pressure-bearing area is set to the limit allowed by the condition, the pressure-bearing capacity of a common compression packer rubber cylinder is difficult to exceed 20MPa, and the super-differential pressure packer has practical requirements in oil extraction engineering, so that a compression packer with higher setting thrust and stronger capacity of bearing the pressure difference between layers is necessary to be designed.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a packer with low setting force and low unsetting force.
The technical problem solved by the invention is realized by adopting the following technical scheme: the invention provides a packer with low setting force and low deblocking force, which comprises an upper joint, a lower joint, a central pipe, a well washing piston sleeve, a rubber cylinder, a liner pipe, a clamp spring hanger and a setting mechanism, wherein the upper joint and the lower joint are respectively connected to the upper end and the lower end of the central pipe through threads, the well washing piston, the liner pipe, the clamp spring hanger and the setting mechanism are arranged on the outer side of the central pipe from top to bottom, the well washing piston sleeve is arranged on the outer side of the well washing piston, a well washing channel is arranged between the liner pipe and the central pipe, and the rubber cylinder is sleeved on the outer side of the liner pipe.
The upper end and the lower end of the liner tube are respectively provided with an upper retaining ring and a lower retaining ring which are used for limiting the upper side and the lower side of the rubber cylinder, the lower side of the upper retaining ring is connected to the upper end of the liner tube through threads, the lower end of the well washing piston sleeve is connected with the upper retaining ring through threads, the lower retaining ring is slidably mounted at the lower end of the liner tube, the clamp spring hanger is connected to the lower end of the liner tube through a deblocking pin, the clamp spring is mounted on the outer side of the clamp spring hanger, the upper end of the setting push sleeve is connected with the lower retaining ring through threads, the clamp spring hanger and the clamp spring are located on the inner side of the setting push sleeve, and the inner side of the setting push sleeve is provided with a horse tooth buckle corresponding to the clamp spring;
the setting mechanism comprises two setting pistons, two sealing seats and a setting push sleeve, the two setting pistons are respectively called a setting piston A and a setting piston B, the upper end of the setting piston A is connected with the lower end of the setting push sleeve through threads, the lower end of the setting piston A is connected with the upper end of the setting piston B through threads, the lower end of the setting piston B is connected with the lower joint through a setting pin, liquid passing holes are respectively and correspondingly formed in the central tube and the lower sides of the two setting pistons, the two sealing seats are fixedly connected to the central tube through threads, the two sealing seats are respectively located in the two setting pistons, and the two liquid passing holes are respectively located on the upper sides of the sealing seats corresponding to the two sealing seats;
the well-flushing piston sleeve is in clearance fit with the upper joint, a radial through hole is processed at the lower end of the upper joint, a check block is inserted into the radial through hole, an arc-shaped protruding portion is arranged at the outer end of the check block, a clamping groove is correspondingly arranged on the inner side of the well-flushing piston sleeve and the arc-shaped protruding portion, and a chamfer is arranged on the lower edge of the clamping groove.
As a further technical scheme, the setting mechanism can be replaced by another technical scheme, the structure of the technical scheme comprises two setting pistons, two sealing seats and a setting push sleeve, the two setting pistons are respectively called a setting piston a and a setting piston B, the upper end of the setting piston a is connected with the lower end of the setting push sleeve through threads, the lower end of the setting piston a is in sliding fit with the upper end of the setting piston B, the lower end of the setting piston B is connected with the lower connector through a setting pin, a liquid passing hole is respectively arranged on the central tube and corresponds to the lower sides of the two setting pistons, the two sealing seats are fixedly connected to the central tube through threads, the two sealing seats are respectively located in the two setting pistons, and the two liquid passing holes are located on the upper sides of the sealing seats corresponding to the sealing seats;
the upper end face of the setting piston B is provided with a stepped hole, a stepped shaft is inserted into the stepped hole, the structure of the stepped shaft comprises a large-diameter section and a small-diameter section, the two sections are respectively in sliding fit with the inner wall of the stepped hole, the outer side of the large-diameter section is provided with a retreating groove, the setting piston B is provided with a locking piece A and a locking piece B corresponding to the outer side of the large-diameter section, the locking piece A is positioned on the upper side of the retreating groove, the inner wall of the setting piston A is provided with a locking groove corresponding to the locking piece A, the inner end of the locking piece A abuts against the outer wall of the large-diameter section, the outer end of the locking piece A is inserted into the locking groove on the inner wall of the setting piston A, the locking piece B is positioned on the lower side of the retreating groove, the outer wall of the central tube is provided with a locking groove corresponding to the locking piece B, the outer end of the locking piece B abuts against the outer wall of the large-diameter section, and the inner end of the locking piece B is inserted into the locking groove on the outer wall of the central tube;
and a spring and a sliding ring are also arranged in an annular space between the setting piston A and the central pipe, the sliding ring is clamped between the spring and the stepped shaft, and the sliding ring always keeps a moving trend of approaching the stepped shaft under the action of the elastic force of the spring.
As a further technical solution, the diameter of the groove bottom of the receding groove is the same as the diameter of the small diameter section.
The beneficial effects of the invention are as follows:
1. the invention adopts a double-cylinder design (namely two setting pistons are arranged), the pressure in the central pipe can respectively enter the two setting pistons through the two liquid passing holes and simultaneously push the two setting pistons to move towards the direction close to the rubber cylinder, and by adopting the structure, the effective bearing area of the setting pistons is twice of that of the original one, so that the setting thrust is greatly improved, and the capacity of the rubber cylinder for bearing the pressure difference between layers is improved.
2. In the invention, the thrusts generated by the two setting pistons are superposed and then act on the rubber cylinder, under the condition, the impact force of the setting push sleeve to the rubber cylinder is doubled at the moment of cutting the setting pin, which undoubtedly puts higher requirements on the mechanical properties such as strength, toughness and the like of the rubber cylinder, and the common rubber cylinder is difficult to meet the use requirements. In order to solve the problem, the invention adopts the piston release mechanism which takes the stepped shaft and the two locking blocks as cores, so that the setting piston A can be gradually released along with the pressure rise in the central pipe pressing process, when the pressure reaches the limit of the setting pin, the setting pin is sheared, the setting piston B can impact the setting piston A with smaller impact force and transmit the impact force to the rubber cylinder, compared with the method of simply fixedly connecting the two setting pistons, the structure can ensure larger setting thrust force and prevent the rubber cylinder from bearing overlarge impact, thereby reducing the requirement on the performance of the rubber cylinder.
3. In the prior art, most of compression packers are unsealed by lifting a pipe column (equivalently lifting a central pipe), and the unsealing mode has the defects of complex structure and easy occurrence of the problem of unsealing and blocking. In order to solve the problem, the invention creatively adopts a mode of pressing the pipe column down to realize the deblocking, compared with the prior art, the structure of the packer is simpler, and the deblocking is more reliable.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of the upper half of FIG. 1;
FIG. 3 is a schematic view of the lower half of FIG. 1;
FIG. 4 is a schematic sectional view of the upper joint;
FIG. 5 is a cross-sectional view taken at A in FIG. 4;
FIG. 6 is a schematic structural view of a backstop;
FIG. 7 is a left side view of FIG. 6;
FIG. 8 is a top view of FIG. 6;
FIG. 9 is a perspective view of the backstop;
FIG. 10 is a schematic structural view of another embodiment of a setting mechanism;
FIG. 11 is a schematic structural view of a stepped shaft;
fig. 12 is a partial enlarged view at B in fig. 2.
In the figure: 1-upper joint, 2-flushing piston sleeve, 3-reverse stop block, 4-flushing piston, 5-upper stop ring, 6-rubber cylinder, 7-liner pipe, 8-central pipe, 9-flushing channel, 10-lower stop ring, 11-snap spring hanger, 12-snap spring, 13-setting push sleeve, 14-sealing seat, 15-setting piston A, 16-setting piston B, 17-setting pin, 18-lower joint, 19-liquid passing hole, 20-crenellated button, 21-radial through hole, 22-arc bulge, 23-spring, 24-sliding ring, 25-locking block A, 26-stepped shaft, 27-locking block B, 28-retreat groove, 29-clamping groove and 30-chamfer.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the first embodiment is as follows:
as shown in figure 1, the well washing piston comprises an upper connector 1, a lower connector 18, a central tube 8, a well washing piston 4, a well washing piston sleeve 2, a rubber sleeve 6, a liner tube 7, a clamp spring 12, a clamp spring hanger 11 and a setting mechanism, wherein the upper connector 1 and the lower connector 18 are respectively connected to the upper end and the lower end of the central tube 8 through threads, the well washing piston 4, the liner tube 7, the clamp spring hanger 11 and the setting mechanism are arranged on the outer side of the central tube 8 from top to bottom, the well washing piston sleeve 2 is arranged on the outer side of the well washing piston 4, a well washing channel 9 is arranged between the liner tube 7 and the central tube 8, and the rubber sleeve 6 is sleeved on the outer side of the liner tube 7. The above is a common structure in the prior art, and is not described herein again.
As shown in fig. 2 and 3, an upper retaining ring 5 and a lower retaining ring 10 for limiting the upper side and the lower side of a rubber cylinder 6 are respectively arranged at the upper end and the lower end of the liner tube 7, the lower side of the upper retaining ring 5 is connected to the upper end of the liner tube 7 through threads, the lower end of the well washing piston sleeve 2 is connected to the upper retaining ring 5 through threads, the lower retaining ring 10 is slidably mounted at the lower end of the liner tube 7, the clamp spring hanger 11 is connected to the lower end of the liner tube 7 through a deblocking pin (the deblocking pin is a common structure in downhole tools, and has the same structure as the setting pin 17, so that the clamp spring 12 is not shown in the drawing), and the clamp spring 12 is mounted outside the clamp spring hanger 11. During deblocking, the tubular column is pressed down, so that the central tube 8 slides downwards, the central tube 8 drives the clamp spring hanger 11 to move downwards, the deblocking pin is cut off, the clamp spring hanger 11 is separated from the liner tube 7, and finally the packer is deblocked.
The invention has the great innovation point of the setting mechanism.
Aiming at the technical problems recorded in the background technology, the invention designs a unique setting mechanism. The invention adopts a double-cylinder design (namely two setting pistons are arranged), the pressure in the central pipe 8 can respectively enter the two setting pistons through the two liquid passing holes 19 and simultaneously push the two setting pistons to move towards the direction close to the rubber cylinder 6, and by adopting the structure, the effective bearing area of the setting pistons is twice of that of the original one, so that the setting thrust is greatly improved, and the capacity of the rubber cylinder 6 for bearing the interlayer pressure difference is improved. The setting mechanism has the following specific structure:
the setting mechanism comprises two setting pistons, two sealing seats 14 and a setting push sleeve 13, wherein the two setting pistons are respectively called a setting piston A15 and a setting piston B16.
The upper end of the setting piston A15 is connected with the lower end of the setting push sleeve 13 through threads, and the lower end of the setting piston A15 is connected with the upper end of the setting piston B16 through threads, so that the setting push sleeve 13, the setting piston A15 and the setting piston B16 are connected together.
The lower end of the setting piston B16 is connected with the lower joint 18 through a setting pin 17, a liquid passing hole 19 is respectively and correspondingly arranged on the lower side of the two setting pistons on the central tube 8, the two sealing seats 14 are fixedly connected on the central tube 8 through threads, the two sealing seats 14 are respectively positioned in the two setting pistons, the two liquid passing holes 19 are respectively positioned on the upper sides of the sealing seats 14 corresponding to the two sealing seats, and the upper end of the setting push sleeve 13 is connected with the lower retaining ring 10 through threads. During setting, the setting pin 17 is sheared under the action of pressure, so that the setting push sleeve 13, the setting piston A15 and the setting piston B16 are released, and after the release, the setting push sleeve 13 directly pushes the lower retaining ring 10 to compress the rubber cylinder 6.
The clamp spring hanger 11 and the clamp spring 12 are located on the inner side of the setting push sleeve 13, a jaw fastener 20 is correspondingly arranged on the inner side of the setting push sleeve 13 and the clamp spring 12, the clamp spring 12 is used for preventing the setting push sleeve 13 from being reset after setting, and therefore the packer is in a stable setting state.
Well-flushing piston sleeve 2 with 1 clearance fit of top connection, the lower extreme processing of top connection 1 has radial through-hole 21, and radial through-hole 21 interpolation is equipped with contrary piece 3 that ends, and the outer end of contrary piece 3 that ends is provided with arc bulge 22, the inboard of well-flushing piston sleeve 2 corresponds with this arc bulge 22 and is provided with draw-in groove 29, and the lower edge of draw-in groove is equipped with chamfer 30.
In the prior art, most of compression packers are deblocking-realized by lifting a pipe column (which is equal to lifting the central pipe 8), and the deblocking method has the defects of complex structure and easy deblocking and blocking. In order to solve the problem, the packer creatively adopts a mode of pressing the pipe column downwards to realize the deblocking, the deblocking pin can be sheared through pressing the pipe column downwards, and even if the clamp spring hanger 11 is separated from the liner pipe 7, compared with the prior art, the packer has the advantages of simpler structure and more reliable deblocking.
Example two:
the difference between the present embodiment and the first embodiment lies in the structure of the setting mechanism.
As shown in fig. 10 and 11, in this embodiment, the setting mechanism includes two setting pistons, two sealing seats 14, and a setting push sleeve 13, where the two setting pistons are respectively called a setting piston a15 and a setting piston B16, the upper end of the setting piston a15 is connected to the lower end of the setting push sleeve 13 through a thread, the lower end of the setting piston a15 is in sliding fit with the upper end of the setting piston B16, the lower end of the setting piston B16 is connected to the lower joint 18 through a setting pin 17, a liquid passing hole 19 is correspondingly arranged on the central tube 8 and on the lower sides of the two setting pistons respectively, the two sealing seats 14 are fixedly connected to the central tube 8 through a thread, the two sealing seats 14 are located in the two setting pistons respectively, and the two liquid passing holes 19 are located on the upper sides of the sealing seats 14 corresponding to the two sealing seats. The above structure is basically the same as the setting mechanism in the first embodiment (the difference is only the connection manner of the setting piston a15 and the setting piston B16), and therefore, the description is omitted here.
As shown in fig. 10, a stepped hole is processed on the upper end surface of the setting piston B16, a stepped shaft 26 is inserted into the stepped hole, the structure of the stepped shaft 26 includes a large-diameter section and a small-diameter section, the two sections are respectively in sliding fit with the inner wall of the stepped hole, a retreat groove 28 is processed on the outer side of the large-diameter section, a lock block a25 and a lock block B27 are correspondingly arranged on the setting piston B16 and the outer side of the large-diameter section, the lock block a25 is located on the upper side of the retreat groove 28, a lock groove is correspondingly arranged on the inner wall of the setting piston a15 and the lock block a25, the inner end of the lock block a25 abuts against the outer wall of the large-diameter section, the outer end of the lock block a25 is inserted into the lock groove on the inner wall of the setting piston a15, the lock block B27 is located on the lower side of the retreat groove 28, a lock groove is correspondingly arranged on the outer wall of the central tube 8, the outer end of the lock block B27 abuts against the outer wall of the large-diameter section, and the inner end of the central tube B27 is inserted into the lock groove on the outer wall of the central tube.
In the first embodiment, the thrusts generated by the two setting pistons are superposed and then act on the rubber sleeve 6, in this case, at the moment that the setting pin 17 is sheared, the impact force of the setting push sleeve 13 on the rubber sleeve 6 is doubled, which undoubtedly puts higher requirements on the mechanical properties such as strength and toughness of the rubber sleeve 6, and the common rubber sleeve 6 is difficult to meet the use requirements. In order to solve the problem, the invention provides a piston release mechanism taking the stepped shaft 26 and two locking blocks as cores, during setting, pressure from the central pipe 8 enters the two setting pistons through the liquid passing hole 19, the pressure entering the setting piston B16 pushes the stepped shaft 26 to move towards the direction close to the rubber cylinder, during the movement of the stepped shaft 26, when the locking block A25 is aligned with the retreat groove 28, the locking block A25 moves towards the direction close to the stepped shaft 26, so that the setting piston A15 is separated from the setting piston B16, and when the locking block B27 is aligned with the small-diameter section, the locking block B27 moves towards the direction close to the stepped shaft 26, so that the setting piston B16 is separated from the central pipe 8. Based on above-mentioned structure, the in-process of setting, setting piston A15 is in the 8 in-process of suppressing of center tube and is released gradually along with pressure rising, and when pressure reached the limit of setting pin 17, setting pin 17 was cut off, and setting piston B16 alright with less impact force impact setting piston A15 to transmit the impact force to packing element 6, compare with two simple setting piston fixed connection that make, this kind of structure can guarantee great setting thrust, can prevent that packing element 6 from bearing too big impact again, thereby has reduced the requirement to packing element 6 performance.
It should be noted that during the pressing process, the pressures on the upper and lower sides of the setting piston B16 cannot be communicated through the stepped hole, otherwise the setting piston B16 would be out of action, and in order to avoid this problem, the stepped shaft 26 and the stepped hole where it is located must be always kept sealed, and the sealing point is ensured by the sealing ring outside the small diameter section. Meanwhile, in order to prevent the stepped shaft 26 from completely coming out of the stepped hole, the slip ring 24 is particularly provided in the present embodiment in order to limit the upper side of the stepped shaft 26. The upper side of the slide ring 24 is stopped by a shoulder on the central tube 8. The slip ring 24 is supported by the spring 23, the slip ring 24 is clamped between the spring 23 and the stepped shaft 26, and the slip ring 24 always keeps a moving trend of approaching the stepped shaft 26 under the elastic force of the spring 23. The spring 23 and the slip ring 24 allow the stepped shaft 26 to be always within the stepped bore,
as a further technical solution, the diameter of the groove bottom of the receding groove is the same as the diameter of the small diameter section.
Claims (2)
1. The utility model provides a packer of low deblocking power of low setting power, includes top connection (1), lower clutch (18), center tube (8), well-flushing piston (4), well-flushing piston cover (2), packing element (6), bushing pipe (7), jump ring (12), jump ring string (11) and setting mechanism, top connection (1) and lower clutch (18) are respectively through threaded connection at the upper and lower both ends of center tube (8), and well-flushing piston (4), bushing pipe (7), jump ring string (11) and setting mechanism install the outside in center tube (8) according to from the top down order, well-flushing piston cover (2) set up the outside in well-flushing piston (4), be provided with well-flushing passageway (9) between bushing pipe (7) and center tube (8), packing element (6) cover is in the outside of bushing pipe (7), its characterized in that:
an upper retaining ring (5) and a lower retaining ring (10) for limiting the upper side and the lower side of a rubber cylinder (6) are respectively arranged at the upper end and the lower end of the liner tube (7), the lower side of the upper retaining ring (5) is connected to the upper end of the liner tube (7) through threads, the lower end of the well washing piston sleeve (2) is connected with the upper retaining ring (5) through threads, the lower retaining ring (10) is slidably mounted at the lower end of the liner tube (7), the clamp spring hanger (11) is connected to the lower end of the liner tube (7) through a deblocking pin, and the clamp spring (12) is mounted on the outer side of the clamp spring hanger (11);
the setting mechanism comprises two setting pistons, two sealing seats (14) and a setting push sleeve (13), the two setting pistons are respectively called a setting piston A (15) and a setting piston B (16), the upper end of the setting piston A (15) is connected to the lower end of the setting push sleeve (13) through threads, the lower end of the setting piston A (15) is in sliding fit with the upper end of the setting piston B (16), the lower end of the setting piston B (16) is connected with the lower joint (18) through a setting pin (17), a liquid passing hole (19) is correspondingly formed in the central tube (8) and the lower sides of the two setting pistons respectively, the two sealing seats (14) are fixedly connected to the central tube (8) through threads, the two sealing seats (14) are located in the two setting pistons respectively, and the two liquid passing holes (19) are located on the upper sides of the sealing seats (14) corresponding to the two sealing seats;
a stepped hole is processed on the upper end face of the setting piston B (16), a stepped shaft (26) is inserted into the stepped hole, the structure of the stepped shaft (26) comprises a large-diameter section and a small-diameter section, the two sections are respectively in sliding fit with the inner wall of the stepped hole, a retreating groove (28) is processed on the outer side of the large-diameter section, a locking block A (25) and a locking block B (27) are correspondingly arranged on the setting piston B (16) and the outer side of the large-diameter section, the locking block A (25) is positioned on the upper side of the retreating groove (28), a locking groove is correspondingly arranged on the inner wall of the setting piston A (15) and the locking block A (25), the inner end of the locking block A (25) abuts against the outer wall of the large-diameter section, the outer end of the locking block A (25) is inserted into the locking groove on the inner wall of the setting piston A (15), the locking block B (27) is positioned on the lower side of the retreating groove (28), a locking groove is correspondingly arranged on the outer wall of the central pipe (8), a locking block B (27) is arranged on the outer wall of the central pipe (27), and the inner end of the locking block B (8) abuts against the outer wall of the large-diameter section;
and a spring (23) and a sliding ring (24) are further arranged in an annular space between the setting piston A (15) and the central pipe (8), the sliding ring (24) is clamped between the spring (23) and the stepped shaft (26), and the sliding ring (24) always keeps a moving trend of approaching the stepped shaft (26) under the elastic force action of the spring (23).
2. A low setting force and low unsetting force packer as claimed in claim 1, wherein: the groove bottom diameter of the receding groove (28) is the same as the diameter of the small diameter section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011014829.9A CN112228001B (en) | 2020-09-24 | 2020-09-24 | Packer with low setting force and low unsetting force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011014829.9A CN112228001B (en) | 2020-09-24 | 2020-09-24 | Packer with low setting force and low unsetting force |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112228001A CN112228001A (en) | 2021-01-15 |
| CN112228001B true CN112228001B (en) | 2022-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011014829.9A Active CN112228001B (en) | 2020-09-24 | 2020-09-24 | Packer with low setting force and low unsetting force |
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| CN (1) | CN112228001B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113338841B (en) * | 2021-06-29 | 2022-07-22 | 大庆市天顺和泰石油科技有限公司 | Mechanical packer |
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| US10724307B2 (en) * | 2016-11-14 | 2020-07-28 | Cameron International Corporation | Annular packer system and method |
| CN209539319U (en) * | 2019-02-05 | 2019-10-25 | 大庆市德油力机械加工有限公司 | Piston type tests envelope well packer capable of flushing well certainly |
| CN210134864U (en) * | 2019-06-27 | 2020-03-10 | 大庆泓洋机械设备有限公司 | Slip packer capable of setting step by step |
| CN211115910U (en) * | 2019-12-04 | 2020-07-28 | 樊平天 | Three-piston hydraulic balance washable well packer |
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2020
- 2020-09-24 CN CN202011014829.9A patent/CN112228001B/en active Active
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