CN109826587B - Large-drift-diameter water-proof oil extraction packer and operation method thereof - Google Patents
Large-drift-diameter water-proof oil extraction packer and operation method thereof Download PDFInfo
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- CN109826587B CN109826587B CN201910110155.3A CN201910110155A CN109826587B CN 109826587 B CN109826587 B CN 109826587B CN 201910110155 A CN201910110155 A CN 201910110155A CN 109826587 B CN109826587 B CN 109826587B
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- 238000000605 extraction Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 91
- 230000007704 transition Effects 0.000 claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
- 238000003780 insertion Methods 0.000 claims abstract description 12
- 230000037431 insertion Effects 0.000 claims abstract description 12
- 238000004873 anchoring Methods 0.000 claims abstract description 4
- 230000007246 mechanism Effects 0.000 claims abstract description 4
- 238000002955 isolation Methods 0.000 claims description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 210000002445 nipple Anatomy 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
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- 230000009193 crawling Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Abstract
The invention discloses a large-diameter water-proof oil extraction packer and an operation method thereof, wherein the large-diameter packer and a sealing insertion pipe are arranged, a hydraulic seal delivering tool comprises an external hydraulic cylinder, a transition sleeve and a transition mandrel, the hydraulic cylinder is arranged at the upper end of the transition sleeve and is used for separating a seal delivering pipe column after setting, the transition sleeve is sleeved on the transition mandrel and is used for connecting a setting anchoring mechanism, and the lower end of the transition mandrel is connected with the large-diameter packer; the large-diameter packer comprises a first central pipe, wherein the upper end and the lower end of the first central pipe are respectively provided with a thin tooth slip, the directions of the clamping teeth are opposite, and a plurality of rubber barrels are uniformly distributed on the first central pipe at intervals; the sealing plug tube is sleeved on the second central tube and is used for being inserted into the large-diameter packer after the large-diameter packer is successfully released. The invention can effectively reduce frequent deblocking and replacing the packer caused by pump checking, measure operation and other reasons, can realize one-time treatment within the effective period of the packer, and can be repeatedly used within the effective period, thereby reducing the separate production workload and the treatment cost.
Description
Technical Field
The invention belongs to the technical field of oil field casing damage well isolation production control, and particularly relates to a large-drift-diameter water-isolation oil production packer and an operation method thereof.
Background
With the short development time of the oil field, perforation and fracture occur in the casing pipe successively due to corrosion and the like, the well leading to communication between the oil layer and the water layer is increased continuously, and the normal exploitation and the effective exertion of the productivity of the oil field are seriously affected. The cost of the treatment measures of casing repair or secondary well cementation is too high for low-yield and low-efficiency wells, so that the casing damage wells generally adopt mechanical isolation production, namely a packer is arranged between a production layer and a water layer.
At present, two types of packer are mainly used, namely a conventional packer is used, the packer is simple in packer production process, but the packer needs to be unpacked out every time a pump is detected and a well is repaired, the validity period is short, and the packer cannot be reused; the other type belongs to long-service-life plug-in type packers, the plug-in pipe is only required to be pulled out when a pump is detected, the packers do not need to be unsealed, the plug-in pipe is reinserted after well completion, but the inner diameter is smaller, the packers must be unsealed when in measure operation, the cost of the packers is higher, and the construction process is complex. Therefore, the two types of packers for separate production at present can not be reused after operation, so that the separate production period of an oil well is short, frequent separate production is realized, and the treatment cost is high.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the large-drift-diameter water-proof oil extraction packer and the operation method thereof, which can meet the requirement of 2, aiming at the defects in the prior art 7 / 8 The operation oil pipe smoothly passes through, one-time treatment can be realized in the effective period of the packer, the repeated utilization can be realized in the effective period, and the workload and treatment cost for frequently unsealing and replacing the packer caused by pump detection, measure operation and other reasons can be effectively reduced.
The invention adopts the following technical scheme:
the hydraulic sealing tool comprises an external hydraulic cylinder, a transition sleeve and a transition mandrel, wherein the hydraulic cylinder is arranged at the upper end of the transition sleeve and is used for separating a sealing pipe column after setting, the transition sleeve is sleeved on the transition mandrel and is used for connecting a setting anchoring mechanism, and the lower end of the transition mandrel is connected with the large-diameter packer; the large-diameter packer comprises a first central pipe, wherein the upper end and the lower end of the first central pipe are respectively provided with a thin tooth slip, the directions of the clamping teeth are opposite, and a plurality of rubber barrels are uniformly distributed on the first central pipe at intervals; the sealing plug tube is sleeved on the second central tube and is used for being inserted into the large-diameter packer after the large-diameter packer is successfully released.
Specifically, the pneumatic cylinder includes cylinder liner and piston, and cylinder liner upper portion is provided with the top connection, and the piston sets up in the annular space that top connection and cylinder liner formed, with piston connection, the transition cover setting is connected with the piston front end in the steel bushing, and the top connection lower extreme is connected with the transition dabber, and the lower extreme of transition dabber passes through reverse threaded connection with first center tube.
Further, the upper joint is connected with the cylinder sleeve through reverse threads, holes are formed in the cylinder sleeve and are communicated with the inner cavity of the piston, and a sealing structure is preset on the contact surface of the piston for pressure bearing sealing.
Specifically, the large-drift-diameter packer comprises a locking sleeve, an intermediate transition shaft, a unidirectional slip, a long taper sleeve, a short taper sleeve, a bidirectional slip and a lower joint, wherein the locking sleeve is sleeved on the transition mandrel, the upper end of the locking sleeve is in contact with the lower end of the transition sleeve, and the intermediate transition shaft, the unidirectional slip, the long taper sleeve, a sealing retainer ring, a rubber sleeve, the short shaft sleeve, the bidirectional slip and the lower joint are sequentially arranged on the first central tube from top to bottom.
Further, a sealing check ring is arranged between the rubber cylinders, and both sides of the sealing check ring are provided with inverted conical surfaces.
Further, the lower end of the transition mandrel is provided with a cone.
Specifically, sealed intubate includes location retaining ring, outer tube, push pipe, goes up sealed gum cover, goes up sealing ring, lower sealed gum cover and lower retaining ring, and location retaining ring, outer tube, push pipe, last packing element, go up sealing ring, lower sealing ring and last packing element cover in proper order on the second center tube, location retaining ring and outer tube and second center tube threaded connection, second center tube lower extreme and lower retaining ring threaded connection.
Further, the upper end of the second base pipe is threaded for connection to a completion tubing.
Further, the outer surfaces of the upper sealing ring and the lower sealing ring are subjected to chromium plating treatment.
Further, another technical scheme of the invention is that the operation method of the large-drift-diameter water-proof oil extraction packer comprises the following steps:
s1, connecting a hydraulic seal pipe column through an upper joint thread of a hydraulic seal tool, slowly pressurizing to 24-27 Mpa by a ground connection pressurizing pump when a large-diameter packer is lowered to a set isolation position, enabling a piston of a hydraulic cylinder to push a rubber cylinder to be fully compressed, continuing to stabilize pressure for 5-8 min, and then relieving pressure to finish setting;
s2, after the step S1 is finished, lifting the sealing pipe column upwards when the hanging weight of the sealing pipe column is changed; if the suspended weight is not increased, the seal feeding hydraulic cylinder is disconnected from the packer, the releasing is successful, and then the seal feeding pipe column is started;
s3, after the step S2 is completed, checking the hydraulic cylinder, starting to lower the completion pipe string, wherein the completion pipe string sequentially comprises the following steps of: sealing the insertion pipe, the oil pipe nipple, the oil pipe, the oil pump and the oil pipe until the wellhead; and slowly lowering the well completion pipe string to the position 8-12 m above the large-diameter packer to ensure that the sealing insertion pipe is inserted into the large-diameter packer, and pressing the sealing insertion pipe for sealing bearing by 3-4 t for well completion production.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention provides a large-drift-diameter water-proof oil extraction packer, which comprises a hydraulic seal delivering tool, a large-drift-diameter packer and a sealing insertion pipe, and is used for realizing 2 7 / 8 The packer is subjected to measure operation through the operation oil pipe, so that frequent unpacking and replacing of the packer caused by pump detection, measure operation and other reasons can be effectively reduced, one-time treatment can be realized within the effective period of the packer, repeated utilization is realized within the effective period, and the separate production workload and treatment cost are reduced.
Further, the external hydraulic cylinder obviously increases the compression stroke, and the forward-transfer sealing pipe column can be separated from the packer after setting.
Further, the lower extreme of transition dabber is provided with the cone, and the locking sleeve of being convenient for crawl the back and the better crawl and lock with the one-way slips of cover on first center tube.
Further, the sealing structure of the sealing insertion tube is provided with sealing rubber barrels on two sides, two sealing rings are sealed in the middle, and the sealing surface is long.
Furthermore, the rubber cylinder and the sealing retainer ring are arranged at intervals, the length of the sealing surface can be optimized and selected according to the requirement, and the inverted conical surfaces are arranged on the two sides of the sealing retainer ring so as to better guide the rubber cylinder to climb up the conical surface of the sealing retainer ring and better seal the sleeve wall, so that the sealing pressure bearing is ensured to be reliable.
Furthermore, the one-way slip and two-way slip combined design is adopted, and meanwhile, the two-way slip combined design can also be used as a baffle after the rubber cylinder is compressed.
In summary, the invention realizes the large-drift-diameter water-proof oil extraction packer capable of passing through the operation oil pipe through the first research design, can effectively reduce frequent deblocking and replacement of the packer caused by pump detection, measure operation and other reasons, can realize one-time treatment within the effective period of the packer, can be reused only by replacing the sealing cannula within the effective period, and reduces the isolation and production workload and the treatment cost.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic illustration of a hydraulic setting tool and large diameter packer combination;
fig. 2 is a schematic view of a sealed cannula assembly.
Wherein: 1. an upper joint; 2. cylinder sleeve; 3. a piston; 4. a transition sleeve; 5. a transition mandrel; 6. a locking sleeve; 7. an intermediate transition shaft; 8. a first central tube; 9. a one-way slip; 10. clamping the taper sleeve; 11. a sealing retainer ring; 12. a rubber cylinder; 13. a short taper sleeve; 14. a two-way slip; 15. a lower joint; 16. a second center tube; 17. positioning a retainer ring; 18. an outer tube; 19. jacking pipes; 20. a sealing rubber sleeve is arranged; 21. an upper seal ring; 22. a lower seal ring; 23. a lower sealing rubber sleeve; 24. and a lower retainer ring.
Detailed Description
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, the large-drift diameter water-proof oil extraction packer comprises a hydraulic seal delivering tool, a large-drift diameter packer and a seal insertion pipe, wherein the hydraulic seal delivering tool comprises an external hydraulic cylinder, a transition sleeve 4 and a transition mandrel 5, and the transition sleeve 4 is sleeved on the transition mandrel 5 and is in contact with a setting anchoring mechanism; the upper end and the lower end of the large-diameter packer are respectively provided with a thin tooth slip, the directions of the clamping teeth are opposite, and rubber barrels 12 for sealing are uniformly distributed at intervals inside the large-diameter packer; the sealing plug is sleeved on the second central tube 16 and is used for being inserted into the large-diameter packer after the releasing is successful.
The hydraulic seal conveying tool comprises an upper joint 1, a cylinder sleeve 2, a piston 3, a transition sleeve 4 and a transition mandrel 5, wherein the upper joint 1 is connected with the cylinder sleeve 2 through reverse threads, and holes are formed in the upper joint and are communicated with the inner cavity of the piston 3; the piston 3 is arranged in an annular space formed by the upper joint 1 and the cylinder sleeve 2, a sealing structure is preset on a contact surface for pressure bearing sealing, and the front end of the piston 3 and the transition sleeve 4 are arranged in the cylinder sleeve 2 and connected with the piston 3 through threads; the lower end of the upper joint 1 is connected with a transition mandrel 5, and the lower end of the transition mandrel 5 is connected with a first central tube 8 through reverse threads.
The large-diameter packer comprises a locking sleeve 6, an intermediate transition shaft 7, a first central pipe 8, a one-way slip 9, a long taper sleeve 10, a sealing retainer ring 11, a rubber cylinder 12, a short taper sleeve 13, a two-way slip 14 and a lower joint 15;
the locking sleeve 6 is sleeved on the transition mandrel 5, the upper end of the locking sleeve is in contact with the lower end of the transition sleeve 4, the middle transition shaft 7, the one-way slip 9, the long taper sleeve 10, the sealing retainer ring 11, the rubber sleeve 12, the short shaft sleeve 13, the two-way slip 14 and the lower joint 15 are sequentially installed on the first central tube 8 from top to bottom, the sealing retainer ring 11 is arranged between the rubber sleeves 12, the number of installation groups of the sealing retainer ring 11 and the rubber sleeves 12 can be determined according to specific conditions, and the lower joint 15 is connected with the lower end of the first central tube 8.
Preferably, both sides of the sealing retainer ring 11 are provided with inverted conical surfaces.
Preferably, the lower end of the transition mandrel 5 is provided with a cone, so that the locking sleeve 6 can better climb and lock with the unidirectional slip 9 sleeved on the central tube 8 after crawling.
Referring to fig. 2, the sealing cannula includes a second central tube 16, a positioning retainer ring 17, an outer tube 18, a top tube 19, an upper sealing gum cover 20, an upper sealing ring 21, a lower sealing ring 22, a lower sealing gum cover 23 and a lower retainer ring 24; the positioning check ring 17 and the outer tube 18 are in threaded connection with the second central tube 16, the jacking tube 19, the upper rubber sleeve 20, the upper sealing ring 21, the lower sealing ring 22 and the upper rubber sleeve 23 are sequentially sleeved on the second central tube 16, and the lower end of the second central tube 16 is in threaded connection with the lower check ring 24.
Preferably, the upper end of the second base pipe 16 of the seal cannula is threaded to facilitate connection to the completion tubing.
Preferably, the outer surfaces of the upper seal ring 21 and the lower seal ring 22 are chrome plated.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The large-drift-diameter water-proof oil extraction packer is put in and isolated from the process as follows:
when the packer is set to a set production isolation position, the ground is connected with a pressurizing pump, the pressure is slowly increased to 25Mpa, the piston 3 pushes the rubber cylinder 12 to be fully compressed, the packer is reliably set, the pressure is continuously stabilized for 5min, and then the pressure is relieved to finish the setting;
when the hanging weight of the forward sealing pipe column is about 15 circles after the completion of setting or the hanging weight of the forward sealing pipe column is obviously changed, lifting the pipe column, if the hanging weight is not obviously increased, indicating that the forward sealing hydraulic cylinder and the packer are successfully disconnected, if the hanging weight is sharply increased, continuing to forward the forward sealing pipe column until the hanging weight is not changed in the lifting process, namely, determining that releasing is successful, and then lifting the forward sealing pipe column;
after the sealing pipe string is lifted, the hydraulic cylinder is checked, if no abnormal condition exists, the completion pipe string can be started to be lowered, and the completion pipe string sequentially comprises: sealing the cannula, the oil pipe nipple, the oil pipe, the oil pump and the oil pipe until the wellhead; and when the well completion pipe string is lowered to about 10m above the packer, slowly lowering the well completion pipe string to ensure that the sealing insertion pipe is smoothly and accurately inserted into the large-diameter packer, and pressing the pressure about 3t to ensure that the sealing insertion pipe and the packer bear pressure, so as to complete well production.
If the pump is required to be checked in the later period, the sealing cannula is directly started, and the packer is not required to be damaged; if the measures such as sand washing and acidification are needed, the production pipe column is started, the operation pipe column passing through the packer is started (the outer diameter is not more than 2 7 / 8 ") is required to be operated, and the sealing plug is taken down again during well completionThe well completion string of the pipe is inserted in a sealing way, and production is continued by isolated production.
The indoor test of the large-drift diameter packer shows that the pressure bearing capacity and the pressure bearing capacity of the rubber sleeve after the packer is set can reach 25MPa, the pressure bearing requirement of the casing damage well isolation production can be met, the air supply hydraulic cylinder after the packer is set is smoothly taken out, and in addition, the maximum pulling force of the plugging tube of the packer is 3-4 t, so that the plugging tube of the field operation machine can be conveniently replaced.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (7)
1. The operation method of the large-drift-diameter water-proof oil extraction packer is characterized in that the large-drift-diameter water-proof oil extraction packer comprises a hydraulic sealing tool, a large-drift-diameter packer and a sealing insertion pipe, the hydraulic sealing tool comprises an external hydraulic cylinder, a transition sleeve (4) and a transition mandrel (5), the hydraulic cylinder is arranged at the upper end of the transition sleeve (4) and is used for separating a sealing tubular column after setting, the transition sleeve (4) is sleeved on the transition mandrel (5) and is used for connecting a setting anchoring mechanism, and the lower end of the transition mandrel (5) is connected with the large-drift-diameter packer; the large-diameter packer comprises a first central pipe (8), wherein a thin tooth slip is arranged at the upper end and the lower end of the first central pipe (8) respectively, the clamping teeth of the two thin teeth are opposite in direction, and a plurality of rubber cylinders (12) are uniformly distributed on the first central pipe (8) at intervals; the sealing plug tube is sleeved on the second central tube (16) and is used for being inserted into the large-diameter packer after the large-diameter packer is successfully released; the hydraulic cylinder comprises a cylinder sleeve (2) and a piston (3), an upper joint (1) is arranged at the upper part of the cylinder sleeve (2), the piston (3) is arranged in an annular space formed by the upper joint (1) and the cylinder sleeve (2), a transition sleeve (4) is arranged in the cylinder sleeve (2) and is connected with the front end of the piston (3), the lower end of the upper joint (1) is connected with a transition mandrel (5), the lower end of the transition mandrel (5) is connected with a first central tube (8) through reverse threads, the upper joint (1) is connected with the cylinder sleeve (2) through reverse threads, a hole is formed in the cylinder sleeve (2) and is communicated with an inner cavity of the piston (3), and a sealing structure is preset on a contact surface of the piston (3) for pressure bearing sealing;
the operation method comprises the following steps:
s1, a large-diameter packer is connected with a seal pipe column through an upper joint thread of a hydraulic seal conveying tool, when the large-diameter packer is lowered to a set isolation position, a ground pressure pump is connected to pressurize to 24-27 MPa, a piston of a hydraulic cylinder pushes a rubber cylinder to fully compress, pressure stabilization is continued for 5-8 min, and then pressure release is completed to seal;
s2, after the step S1 is finished, lifting the pipe sealing column when the weight of the pipe sealing column is changed or the hanging weight of the pipe sealing column is changed; if the suspended weight is not increased, the seal feeding hydraulic cylinder is disconnected from the packer, the success of releasing is indicated, and then the seal feeding pipe column is started;
s3, after the step S2 is completed, checking the hydraulic cylinder, starting to lower the completion pipe string, wherein the completion pipe string sequentially comprises the following steps of: the oil pump comprises a sealing insertion pipe, an oil pipe nipple, an oil pipe, an oil pump and an oil pipe; and slowly lowering the well completion pipe string to the position 8-12 m above the large-diameter packer to ensure that the sealing cannula is inserted into the large-diameter packer, applying pressure for 3-4 t, and ensuring that the sealing cannula and the packer bear pressure in a sealing way, so as to complete well production.
2. The method for operating a large-diameter water-proof oil extraction packer according to claim 1, wherein the large-diameter water-proof oil extraction packer comprises a locking sleeve (6), an intermediate transition shaft (7), a one-way slip (9), a clamping cone sleeve (10), a short cone sleeve (13), a two-way slip (14) and a lower joint (15), the locking sleeve (6) is sleeved on the transition mandrel (5) and the upper end of the locking sleeve is in contact with the lower end of the transition sleeve (4), and the intermediate transition shaft (7), the one-way slip (9), the clamping cone sleeve (10), a sealing retainer ring (11), a rubber sleeve (12), the short cone sleeve (13), the two-way slip (14) and the lower joint (15) are sequentially arranged on the first central tube (8) from top to bottom.
3. The operation method of the large-drift-diameter water-proof oil extraction packer according to claim 1 or 2, wherein a sealing check ring (11) is arranged between rubber cylinders (12), and inverted conical surfaces are arranged on two sides of the sealing check ring (11).
4. Method of operating a large-diameter water-proof oil extraction packer according to claim 1 or 2, characterized in that the lower end of the transition mandrel (5) is provided with a cone.
5. The operation method of the large-drift-diameter water-proof oil extraction packer according to claim 1, wherein the sealing insertion pipe comprises a positioning check ring (17), an outer pipe (18), a jacking pipe (19), an upper sealing rubber sleeve (20), an upper sealing ring (21), a lower sealing ring (22), a lower sealing rubber sleeve (23) and a lower check ring (24), the positioning check ring (17), the outer pipe (18), the jacking pipe (19), the upper sealing rubber sleeve (20), the upper sealing ring (21), the lower sealing ring (22) and the lower sealing rubber sleeve (23) are sequentially sleeved on a second central pipe (16), the positioning check ring (17) and the outer pipe (18) are in threaded connection with the second central pipe (16), and the lower end of the second central pipe (16) is in threaded connection with the lower check ring (24).
6. The method of operating a large diameter water-proof oil extraction packer according to claim 5, characterized in that the upper end of the second base pipe (16) is provided with threads for connecting a completion tubing.
7. The method of operating a large diameter water-proof oil extraction packer of claim 5, wherein the outer surfaces of both the upper seal ring (21) and the lower seal ring (22) are chrome plated.
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| CN201910110155.3A CN109826587B (en) | 2019-02-11 | 2019-02-11 | Large-drift-diameter water-proof oil extraction packer and operation method thereof |
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| CN201910110155.3A CN109826587B (en) | 2019-02-11 | 2019-02-11 | Large-drift-diameter water-proof oil extraction packer and operation method thereof |
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