CN211924131U - Packer of integral mandrel - Google Patents

Packer of integral mandrel Download PDF

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Publication number
CN211924131U
CN211924131U CN202020482668.5U CN202020482668U CN211924131U CN 211924131 U CN211924131 U CN 211924131U CN 202020482668 U CN202020482668 U CN 202020482668U CN 211924131 U CN211924131 U CN 211924131U
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China
Prior art keywords
ring
packer
slip
piston sleeve
central tube
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Active
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CN202020482668.5U
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Chinese (zh)
Inventor
张健
杨改
王琼
陶风
朱向斌
杨阳
张强兵
马杰
马小平
程市君
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Sunrise Energy Technology Co ltd
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Sunrise Energy Technology Co ltd
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Priority to CN202020482668.5U priority Critical patent/CN211924131U/en
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Abstract

The utility model relates to a packer of integral type dabber belongs to oil gas well borehole operation instrument technical field. The slip type pipe joint comprises a central pipe, an upper slip, a lower slip, a locking mechanism and a sealing mechanism; the circumference of the central tube is provided with an upper slip and a lower slip in an up-and-down shape, a sealing mechanism is arranged on the central tube between the upper slip and the lower slip, the sealing mechanism is respectively in contact connection with the upper slip and the lower slip, a locking mechanism is arranged on the central tube below the lower slip, and the locking mechanism is in contact connection with the lower slip. The center tube formula as an organic whole design of this packer can with sit and seal instrument lug connection, effectively reduces the risk that pressure appears and reveals, thread off in the center tube interface, guarantees the packer and sits and seal the reliability, and this packer makes simply, with low costs, can effectively solve present problem because of the packer structure is complicated, the assembly difficulty leads to work efficiency to reduce like this, especially adapted oil gas well borehole operation.

Description

Packer of integral mandrel
Technical Field
The utility model relates to a packer of integral type dabber belongs to oil gas well borehole operation instrument technical field.
Background
Packers are downhole tools that separate different layers of oil and water in a wellbore and are subjected to a pressure differential. When bearing the axial load such as tubular column gravity or with the help of hydraulic pressure power, the packing element receives extrusion expansion deformation, and the laminating sleeve pipe forms sealed space between dabber and sleeve pipe, seals and separates the oil jacket annular space to satisfy isolated production zone, oil recovery requirement.
The packer has the characteristics of high pressure bearing level, strong suspension capacity, good sealing capacity, strong expansibility and the like, is widely applied to well cementation, testing and well completion, and has great market demand in northwest regions. However, the well conditions in the northwest are complex, the internal pressure is high, and great risks exist. The existing permanent packer has a complex structure, a mandrel needs to be connected with an upper end sealing barrel and a lower end connector, and then enters a well together with a setting tool, so that the assembly is difficult, and the internal part of the packer has the risk of tripping and cannot be noticed; and because the internal structure of the packer has no integrity, pressure can leak at the interface, and the setting reliability of the packer is reduced. Therefore, there is a need for improvement thereof.
Disclosure of Invention
The utility model aims to provide a: the packer of the integrated mandrel is compact in structure, convenient to assemble and simple to manufacture, risks of leakage and tripping of mandrel interface pressure are effectively reduced, the setting reliability of the packer is guaranteed, and the load safety factor of the packer can be improved.
The technical scheme of the utility model is that:
a packer of an integrated mandrel is composed of a central tube, an upper slip, a lower slip, a locking mechanism and a sealing mechanism; the method is characterized in that: the circumference of the central tube is provided with an upper slip and a lower slip in an up-and-down shape, a sealing mechanism is arranged on the central tube between the upper slip and the lower slip, the sealing mechanism is respectively in contact connection with the upper slip and the lower slip, a locking mechanism is arranged on the central tube below the lower slip, and the locking mechanism is in contact connection with the lower slip.
The circumference of center tube on the interval form be provided with pass pressure through-hole A and pass pressure through-hole B respectively, pass pressure through-hole A and pass the inside intercommunication of pressure through-hole B and center tube.
The sealing mechanism comprises a rubber cylinder, an upper cone, a lower cone and sealing components, the sealing components are respectively arranged at two ends of the rubber cylinder, the upper cone is arranged above the rubber cylinder, the lower cone is arranged below the rubber cylinder, the upper cone and the lower cone are respectively in contact connection with the sealing components at two ends of the rubber cylinder, and the rubber cylinder is sleeved on the central tube.
The upper cone and the lower cone are respectively connected with the central tube through shear pins A.
The sealing assembly is composed of an outer back ring, an inner back ring and a check ring, the inner back ring is arranged on the outer side of the check ring and is respectively in contact connection with the check ring and the rubber cylinder, the outer back ring is arranged on the inner back ring through a rubber rolling pin, and the check ring is sleeved on the outer circle of the rubber cylinder.
An inner back ring of the rubber cylinder is arranged between the rubber cylinder and the central pipe, and an O-shaped sealing ring is arranged on the inner back ring of the rubber cylinder.
The locking mechanism comprises an upper piston sleeve, a lower piston sleeve, a baffle ring, a retainer ring assembly, a locking ring seat, a C-shaped baffle ring and a baffle ring sleeve, wherein the baffle ring is installed at one end of the upper piston sleeve in a threaded manner, the lower piston sleeve is installed at the other end of the upper piston sleeve in a threaded manner, the upper piston sleeve, the lower piston sleeve and the baffle ring are respectively sleeved on a central pipe, the retainer ring assembly is arranged between the upper piston sleeve and the central pipe, the locking ring seat is arranged between the lower piston sleeve and the central pipe and is in contact connection with the central pipe, the locking ring is arranged between the locking ring seat and the lower piston sleeve, one end of the locking ring seat extends to the outer side of the lower piston sleeve, the retainer ring sleeve is installed on the locking ring seat extending to the outer side of the lower piston sleeve through a bolt, and the C-.
The lower piston sleeve is connected with the lock ring seat through a shearing pin B.
The retainer ring assembly is composed of an inner retainer ring and an outer retainer ring, the inner retainer ring is in threaded connection with the outer retainer ring, and O-shaped seal rings are arranged between the outer retainer ring and the upper piston sleeve and between the outer retainer ring and the central tube respectively.
The locking ring is C-shaped, the inner wall and the outer circle of the locking ring are provided with one-way sawtooth threads, and the locking ring is respectively meshed and connected with the locking ring seat and the lower piston sleeve.
The utility model has the advantages that:
this packer of integral type dabber compact structure, high assembling convenience, in operation, through center tube and sealing mechanism and locking mechanical system cooperation can with sit and seal instrument lug connection, effectively reduce the center tube interface and appear pressure leakage, the risk of dropout, guarantee the packer and sit and seal the reliability, the last slips of this packer and lower slips prong opposite direction, can bear two-way load, effectively guaranteed that the packer sits and does not have the displacement after sealing, the packer load factor of safety has been improved, simultaneously this packer makes simply, low cost, can effectively solve present because of the packer structure is complicated like this, the assembly difficulty leads to the problem that work efficiency reduces, especially adapted oil gas well borehole operation.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;
FIG. 3 is an enlarged schematic view of the structure at B in FIG. 1;
FIG. 4 is an enlarged view of the structure at C in FIG. 1;
FIG. 5 is a schematic structural view of the working state of the present invention;
FIG. 6 is an enlarged view of the structure of FIG. 5 at D;
FIG. 7 is an enlarged view of E in FIG. 5;
fig. 8 is an enlarged schematic view of F in fig. 5.
In the figure: 1. the device comprises a central tube, 2 parts of an upper slip, 3 parts of a lower slip, 4 parts of a locking mechanism, 4-1 parts of an upper piston sleeve, 4-2 parts of a lower piston sleeve, 4-3 parts of a baffle ring, 4-4 parts of a locking ring, 4-5 parts of a locking ring seat, 4-6 parts of a C-shaped baffle ring, 4-7 parts of a baffle ring sleeve, 4-8 parts of an inner baffle ring, 4-9 parts of an outer baffle ring, 4-10 parts of a shearing pin B, 5 parts of a sealing mechanism, 5-1 parts of a rubber cylinder, 5-2 parts of an upper cone body, 5-3 parts of a lower cone body, 5-4 parts of an inner back ring of the rubber cylinder, 5-5 parts of an outer back ring, 5-6 parts of an inner back ring, 5-7 parts of a baffle ring, 5-8 parts of a shearing pin A, 6 parts of a pressure transfer through hole A, 7 parts of a.
Detailed Description
The packer of the integrated mandrel is composed of a central tube 1, an upper slip 2, a lower slip 3, a locking mechanism 4 and a sealing mechanism 5; the slip 2 and the slip 3 are respectively sleeved on the circumference of the central tube 1 in an up-down shape, the tooth tips of the slip 2 and the slip 3 are opposite in direction, a limiting boss is arranged on the circumference of the central tube 1, the limiting boss forms a limiting state for the slip 2, and in work, the central tube 1 can bear bidirectional load through the matching of the slip 2 and the slip 3 and the sleeve 8.
The pressure transmitting through holes A6 and the pressure transmitting through holes B7 are arranged on the circumference of the central tube 1 at intervals, the pressure transmitting through holes A6 and the pressure transmitting through holes B7 are communicated with the inside of the central tube 1, and the pressure transmitting through holes A6 and the pressure transmitting through holes B7 are used for effectively transmitting the liquid pressure inside the central tube 1 to the outside of the central tube 1.
A sealing mechanism 5 is arranged on a central tube 1 between an upper slip 2 and a lower slip 3, the sealing mechanism 5 is composed of a rubber cylinder 5-1, an upper cone 5-2, a lower cone 5-3 and a sealing component, the rubber cylinder 5-1 is sleeved on the central tube 1, a rubber cylinder inner back ring 5-4 is arranged between the rubber cylinder 5-1 and the central tube 1, and an O-shaped sealing ring is arranged on the rubber cylinder inner back ring 5-4, so that the purposes are as follows: the sealing performance between the central tube 1 and the rubber cylinder 5-1 can be effectively ensured.
Two ends of the rubber cylinder 5-1 are respectively provided with a sealing assembly, the sealing assembly is composed of an outer back ring 5-5, an inner back ring 5-6 and a check ring 5-7, the check ring 5-7 is sleeved on the excircle of the rubber cylinder 5-1, the outer side of the check ring 5-7 is provided with the inner back ring 5-6, the inner back ring 5-6 is respectively in contact connection with the check ring 5-7 and the rubber cylinder 5-1, and the outer back ring 5-5 is arranged on the inner back ring 5-6 through a rubber rolling pin.
An upper cone 5-2 is arranged above the rubber cylinder 5-1, a lower cone 5-3 is arranged below the rubber cylinder 5-1, the upper cone 5-2 and the lower cone 5-3 are respectively in contact connection with outer back rings 5-5 at two ends of the rubber cylinder 5-1, the upper cone 5-2 and the lower cone 5-3 are respectively connected with the central tube 1 through a shearing pin A5-8, and in operation, the rubber cylinder 5-1, the outer back rings 5-5, the inner back rings 5-6 and the check rings 5-7 can be limited through the matching of the upper cone 5-2 and the lower cone 5-3.
An upper cone 5-2 of the sealing mechanism 5 is in contact connection with the upper slip 2, and a lower cone 5-3 of the sealing mechanism 5 is in contact connection with the lower slip 3.
A locking mechanism 4 is arranged on a central tube 1 below a lower slip 3, the locking mechanism 4 is composed of an upper piston sleeve 4-1, a lower piston sleeve 4-2, a baffle ring 4-3, a locking ring 4-4, a locking ring seat 4-5, a C-shaped baffle ring 4-6, a baffle ring sleeve 4-7 and a retainer ring assembly, the upper piston sleeve 4-1, the lower piston sleeve 4-2 and the baffle ring 4-3 are respectively sleeved on the central tube 1, one end of the upper piston sleeve 4-1 is provided with the baffle ring 4-3 in a threaded manner, the baffle ring 4-3 of the locking mechanism 4 is in contact connection with the lower slip 3, an O-shaped sealing ring is arranged between the baffle ring 4-3 and the central tube 1 and the upper piston sleeve 4-1, the retainer ring assembly is arranged between the upper piston sleeve 4-1 and the central tube 1 and is composed of an inner retainer ring 4-8 and an outer retainer ring 4-9, the inner retainer ring 4-8 is in threaded connection with the outer retainer ring 4-9, the central tube 1 is provided with a limiting boss, the limiting boss forms a limiting state for the inner retainer ring 4-8, the outer retainer ring 4-9 is respectively provided with an O-shaped sealing ring between the upper piston sleeve 4-1 and the central tube 1, a piston cavity is formed by matching the inner retainer ring 4-8, the outer retainer ring 4-9, the retainer ring 4-3 and the central tube 1, and the central tube 1 is provided with a pressure transmitting through hole A6, and the pressure transmitting through hole A6 is communicated with the piston cavity. In operation, the pressure inside the central tube 1 is transferred into the piston cavity through the pressure transfer through hole A6.
The other end of the upper piston sleeve 4-1 is provided with a lower piston sleeve 4-2 in a threaded manner, the inner wall of the piston sleeve is provided with threads, an O-shaped sealing ring is arranged between the lower piston sleeve 4-2 and the central pipe 1, a lock ring seat 4-5 is arranged on the inner side of the lower piston sleeve 4-2, the outer circle of the lock ring seat 4-5 is provided with threads, the lock ring seat 4-5 is in contact connection with the central pipe 1, the lock ring seat 4-5 is respectively provided with an O-shaped sealing ring between the central pipe 1 and the lower piston sleeve 4-2, a working cavity is formed by matching the lower piston sleeve 4-2, the lock ring seat 4-5 and the central pipe 1, and as the central pipe 1 is provided with a pressure transfer through hole B7, the pressure transfer through hole B7 is communicated with the working cavity, and in work, the liquid pressure in the central pipe 1 is transferred.
The lower piston sleeve 4-2 is connected with a lock ring seat 4-5 through a shearing pin B4-10, a lock ring 4-4 is arranged between the lock ring seat 4-5 and the lower piston sleeve 4-2, the lock ring 4-4 is C-shaped, the inner end and the outer end of the lock ring 4-4 are both provided with one-way sawtooth threads, and the sawtooth threads at the inner end of the lock ring 4-4 are meshed with the threads on the excircle of the lock ring seat 4-5; the outer end of the lock ring 4-4 is provided with sawtooth threads which are meshed with the threads on the inner wall of the lower piston sleeve 4-2.
One end of the lock ring seat 4-5 extends to the outer side of the lower piston sleeve 4-2, a baffle ring sleeve 4-7 is installed on the lock ring seat 4-5 extending to the outer side of the lower piston sleeve 4-2 through a bolt, a C-shaped baffle ring 4-6 is arranged between the baffle ring sleeve 4-7 and the central tube 1, a limiting boss is arranged on the central tube 1 and limits the C-shaped baffle ring 4-6, and therefore the lock ring seat 4-5 is limited through the matching of the C-shaped baffle ring 4-6 and the baffle ring sleeve 4-7.
The upper piston sleeve 4-1 is provided with a pressure relief hole, a pressure relief cavity is formed by matching the upper piston sleeve 4-1, the outer retainer ring 4-9, the central pipe 1 and the lower piston sleeve 4-2, the pressure relief cavity is communicated with the pressure relief hole, and in operation, the pressure in the pressure relief cavity can be released from the pressure relief hole.
The packer of the integrated mandrel is firstly connected with a setting tool, then a setting ball seat is installed at the lower end of the packer in a threaded mode, after the connection of the packer is completed, the whole packer is transported through a drill rod/oil pipe and is put into a preset position, after the packer is put into the preset position, a ball is thrown into the setting ball seat in a pipe column, the ball and the ball seat form sealing, the pressure of the oil pipe is kept, the internal pressure of a central pipe 1 is transmitted to a locking mechanism 4, the locking mechanism 4 extrudes a rubber cylinder 5-1 of a sealing mechanism 5, the rubber cylinder 5-1 is made to be in contact with a sleeve 8, an upper slip 3 and a lower slip 3 are slowly close to the sleeve 8 while the rubber cylinder 5-1 is extruded, when the pressure reaches the setting pressure, the rubber cylinder 5-1 expands to be tightly attached to the inner wall of the sleeve 8, the slips are meshed with the wall of.
The method specifically comprises the following steps:
when the ball and the ball seat form sealing, the pressure of an oil pipe is kept, the internal pressure of the central pipe 1 is gradually increased and is transmitted into a piston cavity formed by matching the upper piston sleeve 4-1 and the central pipe 1 through a pressure transmission through hole A6, the piston cavity is a first-stage piston and is transmitted into a working cavity formed by matching the lower piston sleeve 4-2 and the central pipe 1 through a pressure transmission through hole B7, the piston cavity is a second-stage piston, double-piston setting is adopted, the setting tonnage can be effectively improved, and meanwhile the setting pressure is effectively reduced.
And (3) continuing pumping towards the oil pipe, and gradually increasing the pressure of the central pipe 1, so that the volumes of the piston cavity and the working cavity are gradually increased, the shear pin B4-10 between the lower piston sleeve 4-2 and the lock ring seat 4-5 is sheared, in the process, the baffle ring 4-3, the upper piston sleeve 4-1, the lower piston sleeve 4-2 and the lock ring 4-4 move upwards under the action of double piston force, a thrust is generated on the lower slip 3 through the baffle ring 4-3, and the lower slip 3 transmits the force upwards to the lower cone 5-3.
When the lower cone body is subjected to the force of the lower slip 3 and is larger than the shearing value of the shearing pin A5-8 between the lower cone body and the central tube 1, the shearing pin A5-8 is sheared, the lower cone body moves upwards, the rubber tube 5-1 is in a squeezing state through the matching of the lower cone body and the upper cone body 5-2, the rubber tube 5-1, the outer back ring 5-5 and the inner back ring 5-6 are in contact with the inner wall of the casing 8, the oil tube pumping pressure is continued, the shearing pin A5-8 between the upper cone body 5-2 and the central tube 1 is sheared, the upper cone body 5-2 moves upwards, in the process, the upper slip 2 and the lower slip 3 are pushed to gradually approach the inner wall of the casing 8 through the matching of the upper cone body 5-2 and the lower cone body, and when the pressure reaches the setting pressure, the rubber tube 5-1 expands to be attached to the inner wall of the casing 8, the slips are meshed on the wall of the sleeve 8 to the maximum extent, the locking ring 4-4 is C-shaped, the inner end and the outer end of the locking ring 4-4 are respectively provided with one-way sawtooth threads, the slips can be flicked along the moving direction in the setting process, after the setting is finished, the locking ring 4-4 can shrink under the action of the self elasticity, and a locking state is formed on the outer circle of the locking ring seat 4-5, so that the setting force of the packer is kept in an effective state all the time, namely the setting of the packer is finished, and the isolation of the upper annulus and the lower annulus is realized.
The packer has a compact structure and is convenient to assemble, and because the central tube 1 is an integrated mandrel and can be directly connected with a setting tool, the risks of pressure leakage and tripping of a joint of the central tube 1 are effectively reduced, the setting reliability of the packer is ensured, and the risk of tripping is not worried when torque needs to be transmitted; the upper slip 2 and the lower slip 3 tooth tips of the packer are opposite in direction, so that the packer can bear bidirectional load, the packer is effectively guaranteed to be free of displacement after being set, the packer load safety factor is improved, meanwhile, the packer is simple to manufacture and low in cost, the problem that the working efficiency is reduced due to the fact that the packer is complex in structure and difficult to assemble can be effectively solved, and the packer is very suitable for underground operation of oil and gas wells.

Claims (9)

1. A packer with an integrated mandrel is composed of a central tube (1), an upper slip (2), a lower slip (3), a locking mechanism (4) and a sealing mechanism (5); the method is characterized in that: an upper slip (2) and a lower slip (3) are respectively arranged on the circumference of a central tube (1) in an upper-lower shape, a sealing mechanism (5) is arranged on the central tube (1) between the upper slip (2) and the lower slip (3), the sealing mechanism (5) is composed of a rubber cylinder (5-1), an upper cone (5-2), a lower cone (5-3) and a sealing component, the sealing components are respectively arranged at two ends of the rubber cylinder (5-1), the upper cone (5-2) is arranged above the rubber cylinder (5-1), the lower cone (5-3) is arranged below the rubber cylinder (5-1), the upper cone (5-2) and the lower cone (5-3) are respectively in contact connection with the sealing components at two ends of the rubber cylinder (5-1), the rubber cylinder (5-1) is sleeved on the central tube (1), and the sealing mechanism (5) is respectively in contact connection with the upper slip (2) and the lower slip (3), a locking mechanism (4) is arranged on the central tube (1) below the lower slip (3), and the locking mechanism (4) is in contact connection with the lower slip (3).
2. The packer of an integral mandrel as claimed in claim 1, wherein: the circumference of center tube (1) on the interval form be provided with pass pressure through-hole A (6) and pass pressure through-hole B (7) respectively, pass pressure through-hole A (6) and pass the inside intercommunication of pressure through-hole B (7) and center tube (1).
3. The packer of an integral mandrel as claimed in claim 1, wherein: the locking mechanism (4) is composed of an upper piston sleeve (4-1), a lower piston sleeve (4-2), a baffle ring (4-3), a locking ring (4-4), a locking ring seat (4-5), a C-shaped baffle ring (4-6), a baffle ring sleeve (4-7) and a baffle ring component, wherein the baffle ring (4-3) is installed at one end of the upper piston sleeve (4-1) in a threaded manner, the lower piston sleeve (4-2) is installed at the other end of the upper piston sleeve (4-1) in a threaded manner, the upper piston sleeve (4-1), the lower piston sleeve (4-2) and the baffle ring (4-3) are respectively sleeved on the central tube (1), the baffle ring component is arranged between the upper piston sleeve (4-1) and the central tube (1), the locking ring seat (4-5) is arranged between the lower piston sleeve (4-2) and the central tube (1), the lock ring seat (4-5) is in contact connection with the central tube (1), a lock ring (4-4) is arranged between the lock ring seat (4-5) and the lower piston sleeve (4-2), one end of the lock ring seat (4-5) extends to the outer side of the lower piston sleeve (4-2), a baffle ring sleeve (4-7) is installed on the lock ring seat (4-5) extending to the outer side of the lower piston sleeve (4-2) through a bolt, and a C-shaped baffle ring (4-6) is arranged between the baffle ring sleeve (4-7) and the central tube (1).
4. The packer of an integral mandrel as claimed in claim 3, wherein: the lower piston sleeve (4-2) is connected with the lock ring seat (4-5) through a shearing pin B (4-10).
5. The packer of an integral mandrel as claimed in claim 3, wherein: the check ring assembly is composed of an inner check ring (4-8) and an outer check ring (4-9), the inner check ring (4-8) is in threaded connection with the outer check ring (4-9), and an O-shaped sealing ring is arranged between the outer check ring (4-9) and the upper piston sleeve (4-1) and the central tube (1) respectively.
6. The packer of an integral mandrel as claimed in claim 3, wherein: the locking ring (4-4) is C-shaped, the inner wall and the outer circle of the locking ring (4-4) are provided with one-way sawtooth threads, and the locking ring (4-4) is respectively meshed and connected with the locking ring seat (4-5) and the lower piston sleeve (4-2).
7. The packer of an integral mandrel as claimed in claim 1, wherein: the upper cone (5-2) and the lower cone (5-3) are respectively connected with the central tube (1) through shear pins A (5-8).
8. The packer of an integral mandrel as claimed in claim 1, wherein: the sealing assembly is composed of an outer back ring (5-5), an inner back ring (5-6) and a check ring (5-7), the inner back ring (5-6) is arranged on the outer side of the check ring (5-7), the inner back ring (5-6) is respectively in contact connection with the check ring (5-7) and the rubber cylinder (5-1), the outer back ring (5-5) is arranged on the inner back ring (5-6) through a rubber rolling pin, and the check ring (5-7) is sleeved on the outer circle of the rubber cylinder (5-1).
9. The packer of an integral mandrel as claimed in claim 1, wherein: an inner back ring (5-4) of the rubber cylinder is arranged between the rubber cylinder (5-1) and the central pipe (1), and an O-shaped sealing ring is arranged on the inner back ring (5-4) of the rubber cylinder.
CN202020482668.5U 2020-04-06 2020-04-06 Packer of integral mandrel Active CN211924131U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020482668.5U CN211924131U (en) 2020-04-06 2020-04-06 Packer of integral mandrel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020482668.5U CN211924131U (en) 2020-04-06 2020-04-06 Packer of integral mandrel

Publications (1)

Publication Number Publication Date
CN211924131U true CN211924131U (en) 2020-11-13

Family

ID=73374337

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202020482668.5U Active CN211924131U (en) 2020-04-06 2020-04-06 Packer of integral mandrel

Country Status (1)

Country Link
CN (1) CN211924131U (en)

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