CN111502588B - High-temperature high-pressure layered packer - Google Patents
High-temperature high-pressure layered packer Download PDFInfo
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- CN111502588B CN111502588B CN202010297052.5A CN202010297052A CN111502588B CN 111502588 B CN111502588 B CN 111502588B CN 202010297052 A CN202010297052 A CN 202010297052A CN 111502588 B CN111502588 B CN 111502588B
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- 230000007246 mechanism Effects 0.000 claims abstract description 37
- 238000004873 anchoring Methods 0.000 claims abstract description 12
- 238000010008 shearing Methods 0.000 claims description 50
- 210000000078 claw Anatomy 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
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Classifications
-
- 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
-
- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
-
- 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
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
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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)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a high-temperature high-pressure layered packer, which comprises a central pipe, wherein a pressing sleeve, a rubber cylinder locking mechanism, a rubber cylinder, a slip locking mechanism, an anchoring mechanism, a sleeve, a drift diameter ring and a lower joint are sequentially sleeved on the central pipe from top to bottom; the locking mechanism comprises a rubber cylinder locking mechanism and a slip locking mechanism, the slip locking mechanism locks the slip, the axial load borne by the packer is directly transmitted to the slip through the slip locking mechanism, the sealing mechanism does not bear the axial load, the sealing failure risk is avoided, and the rubber cylinder locking mechanism locks and seals the rubber cylinder. The slip adopts integral slip, has increased the area of contact of slip and sleeve pipe, and the anchoring is more reliable, and it is shallower to bite into the sleeve pipe degree of depth simultaneously, and is less to the sleeve pipe damage.
Description
Technical Field
The invention belongs to the technical field of petroleum and natural gas well completion, and particularly relates to a high-temperature and high-pressure layered packer.
Background
In the technical field of oil and gas well completion, a packer is a very important well completion tool. The conventional packer is subjected to various axial loads and axial vibration loads during use, the loads are transmitted to a sealing mechanism, and long-term action can cause the sealing of the packer to fail. Meanwhile, the split slips adopted by the existing packer are deep in biting depth of the casing pipe and large in damage to the casing pipe, and the split slips are small in contact area with the casing pipe, limited in anchoring force and prone to causing the problem of unreliable anchoring. The axial load causes the problems of sealing failure, large damage of the slip to the casing, unreliable anchoring force and the like, and is particularly serious in high-temperature and high-pressure oil and gas wells.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a high-temperature high-pressure layered packer.
The invention is realized by the following technical scheme:
a high-temperature high-pressure layered packer comprises a central pipe, wherein a pressing sleeve, a rubber cylinder locking mechanism, a rubber cylinder, a slip locking mechanism, an anchoring mechanism, a sleeve, a drift diameter ring and a lower joint are sequentially sleeved on the central pipe from top to bottom;
the upper end of the central tube is connected with the upper joint, an elastic claw is arranged between the lower end of the central tube and the sleeve, an unsealing ring is arranged at the lower end of the central tube, the unsealing ring is connected with the lower joint through a pin, and the unsealing ring is supported inside the elastic claw;
the rubber cylinder locking mechanism comprises an upper lock ring sleeve, an upper gauge ring, an upper lock ring and an upper key, wherein the upper end of the upper lock ring sleeve is connected with the pressing sleeve, the lower end of the upper lock ring sleeve is connected with the upper gauge ring, the upper lock ring and the upper key are arranged in the upper lock ring sleeve, and the lower end of the upper gauge ring is connected with the rubber cylinder;
the slip locking mechanism comprises a lower gauge ring, a lower lock ring sleeve, a lower lock ring and an anti-rotation pin, wherein the upper end of the lower gauge ring is connected with the rubber cylinder, the lower end of the lower gauge ring is connected with the lower lock ring sleeve, the lower lock ring is arranged in the lower lock ring sleeve, and the anti-rotation pin is arranged on the lower lock ring sleeve;
the anchoring mechanism comprises an upper cone, a lower cone, a slip, an upper shearing pin and a lower shearing pin, wherein the upper end of the upper cone is connected with a lower lock ring sleeve, the lower end of the lower cone is connected with a sleeve, the slip is arranged between the upper cone and the lower cone, is connected with the upper cone through the upper shearing pin and is connected with the lower cone through the lower shearing pin;
a snap spring is arranged between the central tube and the lower lock ring sleeve and between the central tube and the upper cone and is used for driving the lower gauge ring and the upper cone to move upwards through a shoulder acting on the lower lock ring sleeve in the unsealing process; and a shoulder is formed at the position where the lower end of the central tube is in contact with the sleeve and used for limiting the upward movement of the central tube in the unsealing process.
In the technical scheme, a key groove is formed in the upper cone body, the middle key is installed on the upper cone body through a set screw to prevent the slips from rotating, an upper shearing pin hole is formed in the upper cone body and used for installing an upper shearing pin, and an anti-rotating pin is arranged on the upper cone body;
in the technical scheme, the lower cone is provided with a lower shearing pin hole for installing a lower shearing pin, and the lower cone is provided with an anti-rotation pin.
In the technical scheme, equally spaced cutting grooves are formed on the surface of the slip along the circumference and are divided into a left end cutting groove with a left opening and a right end cutting groove with a right opening, and the left end cutting groove and the right end cutting groove are alternately arranged.
In the technical scheme, the two sides of the slip are provided with pin holes, namely a left end hole and a right end hole, which are used for installing the upper shearing pin and the lower shearing pin.
In the technical scheme, the upper shearing pin is provided with an upper-end straight groove and a lower-end straight groove, the upper-end straight groove is used for assembling the upper shearing pin on the upper cone, the lower-end straight groove enables the pin to be conveniently cut off and then taken off from the upper cone, the lower shearing pin is provided with an upper-end straight groove and a lower-end straight groove, the upper-end straight groove is used for assembling the lower shearing pin on the lower cone, and the lower-end straight groove enables the pin to be conveniently cut off and then taken off from the lower cone.
In the technical scheme, the size of the upper shearing pin is larger than that of the lower shearing pin, and the lower shearing pin is firstly sheared when the packer is set.
The invention has the advantages and positive effects that:
1. the locking mechanism comprises a rubber cylinder locking mechanism and a slip locking mechanism, the slip locking mechanism locks the slip, the axial load borne by the packer is directly transmitted to the slip through the slip locking mechanism, the sealing mechanism does not bear the axial load, the sealing failure risk is avoided, and the rubber cylinder locking mechanism locks and seals the rubber cylinder.
2. The slip adopts integral slip, has increased the area of contact of slip and sleeve pipe, and the anchoring is more reliable, and it is shallower to bite into the sleeve pipe degree of depth simultaneously, and is less to the sleeve pipe damage.
Drawings
FIG. 1 is a schematic diagram of a high-temperature high-pressure layered packer according to the present invention.
Fig. 2 is a partial structural schematic diagram of the rubber cylinder locking mechanism of the invention.
FIG. 3 is a schematic view of a partial configuration of the slip locking mechanism of the present invention.
Fig. 4 is a partial structural view of the anchoring mechanism of the present invention.
FIG. 5 is a schematic view of the slip construction of the present invention.
FIG. 6 is a schematic view of the upper cone structure of the present invention.
Fig. 7 is a schematic view of the structure of the lower cone of the present invention.
Fig. 8 is a schematic view of the structure of an upper shear pin (lower shear pin) in the present invention.
Wherein: 1 is the pressure cover, 2 is the top connection, 3 is the lock ring, 4 is the lock ring cover, 5 is the key, 6 is the center tube, 7 is the rule ring, 8 is lower rule ring, 9 is the lower lock ring, 10 is the anti-rotation pin, 11 is the lock ring cover down, 12 is the upper cone, 13 is set screw, 14 is the middle key, 15 is the shear pin, 16 is the slips, 17 is the lower cone, 18 is the sleeve, 19 is the lower key, 20 is the elastic claw, 21 is the deblocking ring, 22 is the latus rectum ring, 23 is the lower clutch, 24 is the shear pin down, 25 is the uide pin, 26 is the jump ring, 27 is the packing element. 28 is a left end hole, 29 is a right end hole, 30 is a left end slot, 31 is a right end slot, 32 is an upper shear pin hole, 33 is a guide pin hole, 34 is a key groove, 35 is a set screw hole, 36 is a lower shear pin hole, 37 is an upper end linear groove, and 38 is a lower end linear groove.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
Examples
Referring to fig. 1, a high temperature and high pressure zonal packer. The anti-rotation slip ring mainly comprises a pressing sleeve 1, an upper connector 2, an upper locking ring 3, an upper locking ring sleeve 4, an upper key 5, a central pipe 6, an upper gauge ring 7, a lower gauge ring 8, a lower locking ring 9, an anti-rotation pin 10, a lower locking ring sleeve 11, an upper cone 12, a set screw 13, a middle key 14, an upper shearing pin 15, a slip 16, a lower cone 17, a sleeve 18, a lower key 19, an elastic claw 20, an unsealing ring 21, a drift diameter ring 22, a lower connector 23, a lower shearing pin 24, a guide pin 25, a snap spring 26, a rubber sleeve 27 and the like.
The upper end of the central tube 6 is connected with the upper connector 2, an elastic claw 20 is arranged between the lower end of the central tube 6 and the sleeve, an unsealing ring 21 is arranged at the lower end of the central tube 6, the unsealing ring 21 is connected with the lower connector 23 through a pin, and the unsealing ring 21 is supported inside the elastic claw 20;
the rubber cylinder locking mechanism comprises an upper lock ring sleeve 4, an upper gauge ring 7, an upper lock ring 3 and an upper key 5, wherein the upper end of the upper lock ring sleeve 4 is connected with the pressing sleeve 1, the lower end of the upper lock ring sleeve is connected with the upper gauge ring 7, the upper lock ring 3 and the upper key 5 are arranged in the upper lock ring sleeve 4, and the lower end of the upper gauge ring 7 is connected with the rubber cylinder;
the slip locking mechanism comprises a lower gauge ring 8, a lower lock ring sleeve 11, a lower lock ring 9 and an anti-rotation pin 10, wherein the upper end of the lower gauge ring 8 is connected with the rubber cylinder, the lower end of the lower gauge ring is connected with the lower lock ring sleeve 11, the lower lock ring 9 is arranged in the lower lock ring sleeve 11, and the anti-rotation pin 10 is arranged on the lower lock ring sleeve 11;
the anchoring mechanism comprises an upper cone 12, a lower cone 17, slips 16, an upper shearing pin 15 and a lower shearing pin 24, wherein the upper end of the upper cone 12 is connected with a lower lock ring sleeve 11, the lower end of the lower cone 17 is connected with a sleeve 18, the slips 16 are arranged between the upper cone 12 and the lower cone 17, are connected with the upper cone 12 through the upper shearing pin 15 and are connected with the lower cone 17 through the lower shearing pin 24;
a clamp spring 26 is arranged between the central tube 6 and the lower lock ring sleeve 11 and between the central tube and the upper cone 12 and is used for driving the lower gauge ring 8 and the upper cone 12 to move upwards through a shoulder acting on the lower lock ring sleeve in the unsealing process; a shoulder is formed at the position where the lower end of the central tube 6 is in contact with the sleeve 18, and is used for limiting the upper movement of the central tube in the unsealing process.
The upper cone 12 is provided with a key slot 34, the middle key 14 is installed on the upper cone through a set screw 13 to prevent the slip from rotating, the upper cone is provided with an upper shearing pin hole 32 for installing an upper shearing pin 15, and the upper cone is provided with an anti-rotating pin;
and a lower shearing pin hole 36 is formed in the lower cone and used for installing a lower shearing pin 24, and an anti-rotating pin 25 is arranged on the lower cone.
The surface of the slip 16 is formed with equally spaced slots along the circumference, which are divided into a left end slot 30 opened at the left side and a right end slot 31 opened at the right side, which are alternately arranged.
Two sides of the slip 16 are provided with pin holes, namely a left end hole 28 and a right end hole 29, for installing the upper shearing pin 15 and the lower shearing pin 24.
The upper shearing pin 15 is provided with an upper-end straight groove 37 and a lower-end straight groove 38, the upper-end straight groove is used for assembling the upper shearing pin on the upper cone body, the lower-end straight groove enables the pin to be conveniently cut off and then taken down from the upper cone body, the lower shearing pin 24 is provided with an upper-end straight groove and a lower-end straight groove, the upper-end straight groove is used for assembling the lower shearing pin on the lower cone body, and the lower-end straight groove enables the pin to be conveniently cut off and then taken down from the lower cone body.
The size of the upper shear pin 15 is larger than that of the lower shear pin 24, and the lower shear pin is firstly sheared when the packer is set.
The working principle of the high-temperature high-pressure layered packer is as follows: when setting, because the left-handed square buckle of the packer upper joint 2 is connected with a service tool, the central pipe 6 does not generate displacement, a push cylinder of the service tool pushes the packer pressing sleeve 1, the upper lock ring sleeve 4 and the upper gauge ring 7 to move downwards, a rubber cylinder 27 is compressed, then the lower gauge ring 8, the lower lock ring sleeve 11 and the upper cone 12 are pushed to move downwards, the lower shearing pin 24 and the upper shearing pin 15 are firstly cut off, the slip 16 is radially opened to bite the casing under the action of the upper cone 12 and the lower cone 17,
in the descending process of the upper lock ring sleeve 4 and the lower lock ring sleeve 11, the upper lock ring 3 and the lower lock ring 9 are respectively driven to descend, after the setting force reaches a designed value, the setting of the packer is completed, at the moment, the slips 16 bite the sleeve, and the rubber sleeve 27 is completely expanded. The slips 16 and glue barrel 27 are locked into a set condition by the locking mechanism. In the setting state of the packer, if the packer is subjected to downward axial load and axial vibration load, the load is transmitted to the slips 16 through the central pipe 6, the lower lock ring 9, the lower lock ring sleeve 11 and the upper cone 12, and if the packer is subjected to upward axial load and axial vibration load, the load is directly transmitted to the slips 16 through the lower cone 17. So that no load is transmitted to the packing element 27, whatever the axial load the packer is subjected to. When the packer is unsealed, a special unsealing tool is put down to a position where the packer is blocked, the unsealing tool and the upper connector 2 of the packer are positioned at the moment, then the pipe column is lifted, the unsealing claw of the unsealing tool lifts the unsealing ring 21 of the packer, a shearing pin between the unsealing ring and the lower connector 23 is sheared, the pipe column is continuously lifted, the unsealing ring 21 drives the central pipe 6 to move upwards, the central pipe 6 drives the upper connector 2, the upper ring sleeve 4 and the upper gauge ring 7 to move upwards, the rubber sleeve 27 is released, then the clamp spring 26 on the central pipe 6 drives the lower gauge ring 8 and the upper cone 12 to move upwards, the slips 16 are released, the lower cone 17 is in contact with the shoulder of the central pipe 6, and the unsealing of the packer is completed. After unsealing, the packer cannot be set again by the friction force of the sleeve and the packer in the process of pulling out the tubular column because the pressing sleeve 1 and the upper joint 2 realize axial limit and the snap spring 26 on the upper cone 12 and the central tube 6 realize axial limit.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (6)
1. A high temperature high pressure layering packer which characterized in that: the pipe joint comprises a central pipe (6), wherein a pressing sleeve (1), a rubber cylinder locking mechanism, a rubber cylinder (27), a slip locking mechanism, an anchoring mechanism, a sleeve (18), a drift diameter ring (22) and a lower joint (23) are sequentially sleeved on the central pipe from top to bottom;
the upper end of the central tube (6) is connected with the upper connector (2), an elastic claw (20) is arranged between the lower end of the central tube (6) and the sleeve (18), an unsealing ring (21) is arranged at the lower end of the central tube (6), the unsealing ring (21) is connected with the lower connector (23) through a pin, and the unsealing ring (21) is supported inside the elastic claw (20);
the rubber cylinder locking mechanism comprises an upper locking ring sleeve (4), an upper gauge ring (7), an upper locking ring (3) and an upper key (5), the upper end of the upper locking ring sleeve (4) is connected with the pressing sleeve (1), the lower end of the upper locking ring sleeve is connected with the upper gauge ring (7), the upper locking ring (3) and the upper key (5) are arranged in the upper locking ring sleeve (4), and the lower end of the upper gauge ring (7) is connected with the rubber cylinder;
the slip locking mechanism comprises a lower gauge ring (8), a lower lock ring sleeve (11), a lower lock ring (9) and an anti-rotation pin (10), wherein the upper end of the lower gauge ring (8) is connected with the rubber cylinder, the lower end of the lower gauge ring is connected with the lower lock ring sleeve (11), the lower lock ring (9) is arranged in the lower lock ring sleeve (11), and the anti-rotation pin (10) is arranged on the lower lock ring sleeve (11);
the anchoring mechanism comprises an upper cone (12), a lower cone (17), a slip (16), an upper shearing pin (15) and a lower shearing pin (24), wherein the upper end of the upper cone (12) is connected with a lower lock ring sleeve (11), the lower end of the lower cone (17) is connected with a sleeve (18), the slip (16) is arranged between the upper cone (12) and the lower cone (17), is connected with the upper cone (12) through the upper shearing pin (15), and is connected with the lower cone (17) through the lower shearing pin (24);
a snap spring (26) is arranged between the central tube (6) and the lower lock ring sleeve (11) and between the central tube and the upper cone (12) and is used for driving the lower gauge ring (8) and the upper cone (12) to move upwards through a shoulder acting on the lower lock ring sleeve in the unsealing process; and a shoulder is formed at the position where the lower end of the central tube (6) is contacted with the sleeve (18) and used for limiting the upper movement of the central tube in the unsealing process.
2. The high temperature and high pressure zonal packer of claim 1, wherein: go up and be equipped with keyway (34) on cone (12), well key (14) are installed on last cone through holding screw (13), prevent that the slips from rotating, go up and be equipped with shear pin hole (32) on the cone for install shear pin (15), be equipped with on the cone and prevent changeing pin (25).
3. The high temperature and high pressure zonal packer of claim 1, wherein: and a lower shearing pin hole (36) is formed in the lower cone and used for installing a lower shearing pin (24), and an anti-rotating pin (25) is arranged on the lower cone.
4. The high temperature and high pressure zonal packer of claim 1, wherein: equally spaced slots are formed on the surface of the slip (16) along the circumference, and the slots are divided into a left end slot (30) opened from the left side and a right end slot (31) opened from the right side, and the left end slot and the right end slot are alternately arranged.
5. The high temperature and high pressure zonal packer of claim 1, wherein: and pin holes, namely a left end hole (28) and a right end hole (29), are formed in two sides of the slip (16) and are used for installing an upper shearing pin (15) and a lower shearing pin (24).
6. The high temperature and high pressure zonal packer of claim 1, wherein: the upper shearing pin (15) is provided with an upper-end straight groove (37) and a lower-end straight groove (38), the upper-end straight groove is used for assembling the upper shearing pin on the upper cone, the lower-end straight groove is convenient for the upper shearing pin to be cut off and then taken down from the upper cone, the lower shearing pin (24) is provided with an upper-end straight groove and a lower-end straight groove, the upper-end straight groove is used for assembling the lower shearing pin on the lower cone, and the lower-end straight groove is convenient for the lower shearing pin to be cut off and then taken down from the lower cone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010297052.5A CN111502588B (en) | 2020-04-15 | 2020-04-15 | High-temperature high-pressure layered packer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010297052.5A CN111502588B (en) | 2020-04-15 | 2020-04-15 | High-temperature high-pressure layered packer |
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| CN111502588A CN111502588A (en) | 2020-08-07 |
| CN111502588B true CN111502588B (en) | 2022-04-12 |
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| CN202010297052.5A Active CN111502588B (en) | 2020-04-15 | 2020-04-15 | High-temperature high-pressure layered packer |
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| CN113027378B (en) * | 2021-05-21 | 2021-08-31 | 东营市瑞丰石油技术发展有限责任公司 | High-temperature high-pressure packer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7424909B2 (en) * | 2004-02-27 | 2008-09-16 | Smith International, Inc. | Drillable bridge plug |
| CN201269075Y (en) * | 2008-08-29 | 2009-07-08 | 徐正国 | Novel flushing safety slip packer |
| CN101382052B (en) * | 2008-10-21 | 2011-12-14 | 张永祥 | Back-off packer |
| CN110939403A (en) * | 2019-12-13 | 2020-03-31 | 孙肖 | Double hydraulic bidirectional anchoring packer |
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