CN220151307U

CN220151307U - Upper sealer

Info

Publication number: CN220151307U
Application number: CN202321128080.XU
Authority: CN
Inventors: 秦世群; 李景全; 杨庆安; 迟佳莹; 何飞龙; 毛门丰
Original assignee: China Petroleum and Chemical Corp; Sinopec Henan Oilfield Branch Co
Current assignee: China Petroleum and Chemical Corp; Sinopec Henan Oilfield Branch Co
Priority date: 2023-05-11
Filing date: 2023-05-11
Publication date: 2023-12-08
Anticipated expiration: 2033-05-11

Abstract

The utility model relates to an upper sealer, which comprises an upper sealer inner hole, wherein a guide sleeve and an upper annular sealing piece which are distributed up and down are arranged in the upper sealer inner hole; the upper annular sealing element is used for realizing sealing with the smooth outer wall of the cannula through circumferential sealing fit, an upper guide section, a guide conical surface and a lower guide section which are distributed up and down are arranged on the inner circumferential surface of the guide sleeve, the inner diameter of the upper guide section is larger than that of the lower guide section, and the inner diameter of the lower guide section is larger than that of the upper annular sealing element. The upper sealing device provided by the utility model has the advantages that the upper annular sealing element in the upper sealing device is used for realizing sealing with the smooth outer wall of the cannula through circumferential sealing cooperation, the guide sleeve capable of centering the cannula towards the center is also arranged in the upper sealing device, and the guide sleeve is positioned above the upper annular sealing element, so that the collision or eccentric extrusion of the cannula to the upper annular sealing element can be reduced, and the service life of the sealing structure in the cannula water shutoff pipe column is prolonged.

Description

Upper sealer

Technical Field

The utility model relates to the technical field of oil field mechanical exploitation water shutoff, in particular to an upper sealer used in a release outer pipe of a pipe insertion water shutoff pipe column.

Background

In the development process of oil fields, particularly in the later stage of water injection development, comprehensive water content rises gradually, and the contradiction between layers is more and more prominent, so that in order to know an oil layer, oil stabilization and water control are carried out, a 'cannula is often used for finding and plugging a water pipe column'. The cannula in the prior art can be seen in the 'three-layer oil extraction is with looking for water shutoff pipe column' disclosed in patent document with the authority bulletin number of CN 210919029U, this looks for water shutoff pipe column includes release outer tube and inner tube, is equipped with the central channel that supplies inner tube male in the release outer tube, and the release outer tube includes two packers that distribute from top to bottom: the upper packer and the lower packer are used for dividing the release outer pipe into an upper section, a middle section and a lower section and separating three oil recovery layers simultaneously: the upper oil recovery layer, the middle oil recovery layer and the lower oil recovery layer are respectively provided with an oil inlet channel which is communicated with each oil recovery layer and the central channel on each section of the releasing outer pipe, and the inner pipe comprises sealing insertion pipes which are distributed up and down: the inner tube is provided with a central channel, an oil pump is arranged in the central channel, the inner tube further comprises a sieve tube positioned between the second sealing cannula and the third sealing cannula, a cannula liquid inlet hole communicated with the central channel is formed in the inner tube through a sieve tube through hole on the sieve tube, and an outer sealing tube which is positioned in the central channel and matched with the sealing cannula is arranged in the releasing outer tube: an upper outer sealing cylinder and a lower outer sealing cylinder, in particular, a sealing ring is arranged on the periphery of the sealing insertion tube, and the outer sealing cylinder is provided with an inner peripheral surface for sealing fit with the sealing ring. When the inner pipe is used, the inner pipe is lifted up and lowered down, the oil recovery layer of appointed exploitation in the upper oil recovery layer, the middle oil recovery layer and the lower oil recovery layer can be exploited by changing the position of the sieve pipe in the central channel and the sealing fit formed by the insertion of the corresponding sealing insertion pipe and the outer sealing cylinder, and the oil recovery layer of appointed blocking in the upper oil recovery layer, the middle oil recovery layer and the lower oil recovery layer can be blocked.

From the above, in the prior art, the four sealing cannulas on the inner pipe are matched with the two outer sealing barrels on the releasing outer pipe to realize the plugging separation of each oil layer on the upper side and the lower side of the packer, and in actual work, the sealing rings on the peripheries of the four sealing cannulas are easily rubbed with the shaft wall to be damaged in the inner pipe down-hole process, so that the problem of water searching and plugging failure is caused. Therefore, the sealing structure in the plugging water pipe column is easy to damage, the service life is short, and the reliability is poor.

Disclosure of Invention

The utility model aims to provide an upper sealer which is used for improving the durability and the reliability of a sealing structure in a plugging pipe column of a cannula.

The utility model discloses an upper sealer which is used for being arranged in a release outer pipe of a cannula plugging finding pipe column and comprises an upper sealer inner hole, wherein the upper sealer inner hole is used as a part of a central channel in the release outer pipe and can be inserted through by a cannula of the cannula plugging finding pipe column; the upper annular sealing element is used for realizing sealing with the smooth outer wall of the cannula through circumferential sealing fit, an upper guide section, a guide conical surface and a lower guide section which are distributed up and down are arranged on the inner circumferential surface of the guide sleeve, the inner diameter of the upper guide section is larger than that of the lower guide section, the inner diameter of the lower guide section is larger than that of the upper annular sealing element, and the guide conical surface is large and small up and down and is used for centering and guiding the cannula entering the guide sleeve.

According to the upper sealer provided by the utility model, the upper annular sealing element in the upper sealer is used for being matched with the smooth outer wall of the cannula through circumferential sealing to realize sealing, and the sealing assembly is not required to be installed on the cannula, so that the damage caused by friction between the rubber seal outside the sealing assembly and the wall of a shaft in the process of going down the well can be avoided, meanwhile, the upper sealer is also internally provided with the guide sleeve capable of centering the cannula towards the center, and the guide sleeve is positioned above the upper annular sealing element, so that the collision or eccentric extrusion of the cannula to the upper annular sealing element can be reduced, the sealing reliability is improved, and the service life of the sealing structure in the cannula water plugging finding tubular column is prolonged.

Further, the upper annular sealing piece comprises an annular support and a rubber sealing ring, and the rubber sealing ring is arranged on the inner circumferential surface of the annular support.

Further, the rubber sealing ring is combined with the annular groove on the inner peripheral surface of the annular support in a vulcanization mode, the annular support is a vulcanized steel part, and the rubber sealing ring is vulcanized rubber.

Further, an outer sealing ring groove is formed in the outer peripheral surface of the annular support, and a sealing ring in sealing fit with the inner peripheral surface of the inner hole of the upper sealer is installed in the outer sealing ring groove.

Further, the upper sealer comprises an upper joint and a lower joint, the upper joint and the lower joint are hollow tubular, an inner hole of the upper sealer is formed in the upper sealer, and the guide sleeve and the upper annular sealing piece are both arranged in the lower joint.

Further, the upper end of the upper joint is provided with an internal thread for being connected with the connecting pipe, and the lower end of the lower joint is provided with an external thread for being connected with the connecting pipe.

Further, the lower end part of the upper joint is connected with the upper end part of the lower joint through threads.

Further, the lower end part of the upper joint is provided with an internal thread, the upper end part of the lower joint is provided with an external thread, and the upper end part of the lower joint is inserted into the lower end part of the upper joint to realize threaded fit.

Further, an outer baffle edge is arranged on the outer peripheral surface of the guide sleeve, an inward convex inner baffle edge is arranged in the upper joint, and the outer baffle edge is clamped between the lower end surface of the inner baffle edge of the upper joint and the upper end surface of the lower joint so that the guide sleeve is fixed.

Further, the inner peripheral surface of the inner baffle edge of the upper joint is provided with a chamfer which is inclined from top to bottom from outside to inside, the chamfer is positioned above the inner peripheral surface of the guide sleeve, and the chamfer is used for centering and guiding the insertion pipe before entering the guide sleeve.

Drawings

FIG. 1 is a schematic structural view of an embodiment of an upper sealer of the utility model;

FIG. 2 is a view of the use of an embodiment of the upper sealer of the utility model in a cannula water shutoff string;

FIG. 3 is a schematic view of the cannula of FIG. 2;

in the figure:

1. an oil pump; 2. an anchor; 3. a cannula; 31. a cannula liquid inlet hole; 32. a first cannula; 33. a conical head; 34. a connector; 35. a second cannula; 4. a release device; 5. an upper sealer; 51. an upper joint; 511. an inner blocking edge; 52. a guide sleeve; 521. an upper guide section; 522. a lower guide section; 523. a guiding conical surface; 524. an outer stop edge; 53. an annular bracket; 531. an outer seal ring groove; 54. a rubber seal ring; 55. a lower joint; 6. setting a packer; 7. a lower sealer; 71. a medium liquid inlet channel; 8. a safety joint; 9. a lower packer; 10. sealing the ball seat; 11. a screen pipe; 12. plugging; 100. a sleeve; 101. a top oil extraction layer; 102. a medium oil recovery layer; 103. and (5) lower oil production layer.

Detailed Description

An embodiment of an upper sealer of the utility model is shown in fig. 1-3. Because the upper sealer of the utility model belongs to a component part of the release outer pipe of the pipe insertion and water blocking finding pipe column, for convenience of understanding, the pipe insertion and water blocking finding pipe column with the upper sealer of the utility model applied is described by fig. 2 and 3 before the specific structure of the upper sealer is described, the pipe insertion and water blocking finding pipe column comprises the release outer pipe and the inner pipe, the release outer pipe is used for being fixed in the sleeve 100 of an oil well, a central channel for inserting the inner pipe is arranged in the release outer pipe, and the inner pipe is used for being inserted in the release outer pipe.

The release outer tube comprises two packers distributed up and down: the upper packer 6 and the lower packer 9 are connected in series through connecting pipes, and the two packers are in sealing fit with the sleeve 100, so that the packer divides the outer release pipe into an upper section, a middle section and a lower section from the outside and simultaneously separates oil recovery layers into three oil recovery layers which are in one-to-one correspondence with the sections of the outer release pipe: the upper oil recovery layer 101, the middle oil recovery layer 102 and the lower oil recovery layer 103 are respectively provided with an oil inlet channel on each section of the releasing outer pipe: the oil inlet device comprises an upper oil inlet channel, a middle oil inlet channel and a lower oil inlet channel, wherein each oil inlet channel is respectively used for communicating an oil extraction layer corresponding to each section of the releasing outer pipe with the central channel. The releasing outer tube is also provided with a releasing device 4, a safety joint 8, a seat sealing ball seat 10, a sieve tube 11 and a plug 12 which belong to the prior art.

The outer release tube further comprises a sealer for sealing engagement with the cannula 3: an upper sealer 5 and a lower sealer 7, wherein an annular sealing element is arranged in the sealer: the upper annular seal installed in the upper sealer 5, the lower annular seal installed in the lower sealer 7, the upper sealer 5 and the lower sealer 7 are respectively positioned on the upper side and the lower side of the upper packer 6, the upper oil inlet passage is positioned above the upper sealer 5, the lower oil inlet passage is positioned below the lower sealer 7, and in the embodiment, the middle oil inlet passage is arranged on the lower sealer 7 and positioned above the lower annular seal, namely, the middle oil inlet passage is positioned between the upper annular seal and the lower annular seal. That is, the upper annular seal of the upper sealer 5 and the lower annular seal of the lower sealer 7 divide the outer pipe of the release into three upper, middle and lower sections from the inside, and the aforementioned respective oil intake passages (upper oil intake passage, middle oil intake passage, lower oil intake passage) are respectively located on the sections divided by the upper sealer 5 and the lower sealer 7.

The inner pipe is provided with a central channel which is used as an oil pumping channel, the central channel is provided with an oil pump 1, the inner pipe comprises an anchor 2 and a cannula 3 positioned at the lower end part of the inner pipe, the lowest end of the cannula 3 is closed, and the cannula 3 is provided with a cannula liquid inlet hole 31 communicated with the central channel. As shown in fig. 3, the cannula 3 is a hollow tube, the upper and lower sides of the cannula liquid inlet hole 31 are provided with sealing matching sections formed by smooth outer walls with equal outer diameters, the sealing matching sections comprise an upper sealing matching section and a lower sealing matching section, the sealing matching sections of the cannula 3 and annular sealing elements in the upper sealing device 5 and the lower sealing device 7 are in circumferential sealing matching to realize sealing, and the sealing matching sections are used for matching the annular sealing elements in the upper sealing device 5 and the lower sealing device 7 when the inner tube is lifted up and down (the annular sealing elements are divided into an upper annular sealing element arranged in the upper sealing device 5 and a lower annular sealing element arranged in the lower sealing device 7), so as to separate oil extraction layer plugging corresponding to the two sides of the packer of the corresponding release outer tube. The cannula 3 is formed by connecting a first cannula 32, a connector 34 and a second cannula 35 from bottom to top, the lower end of the first cannula 32 is provided with a conical head 33, and a cannula liquid inlet hole 31 is formed in the second cannula 35.

The embodiment of the upper sealer of the utility model is applied to the cannula plugging finding pipe column, and when the cannula 3 is inserted into the upper sealer 5 and the lower sealer 7, the cannula plugging finding pipe column is used, the following working modes exist:

(a) The cannula feed port 31 is located below the lower annular seal of the lower sealer 7, and the cannula feed port 31 communicates with the lower oil feed passage to recover oil from the lower oil recovery layer 103.

(b) The cannula feed port 31 is located above the central feed passage 71 and below the upper annular seal of the upper sealer 5, and the cannula feed port 31 communicates with the central feed passage to recover oil from the central oil recovery layer 102.

(c) The cannula feed port 31 is located above the upper annular seal of the upper sealer 5, and the cannula feed port 31 communicates with the upper oil intake passage to recover oil from the upper oil recovery layer 101.

As shown in fig. 1, the upper sealer of the present utility model includes upper and lower joints 51, 55, each of which upper and lower joints 51, 55 is hollow tubular to form an upper sealer inner bore in the upper sealer 5 that can be inserted through by the cannula 3 as part of a central passage in the outer tube of the release.

The upper joint 51 has an internal thread for connection with a connection pipe at its upper end, and the lower joint 55 has an external thread for connection with a connection pipe at its lower end. The lower end of the upper joint 51 is screwed with the upper end of the lower joint 55, the lower end of the upper joint 51 is provided with internal threads, the upper end of the lower joint 55 is provided with external threads, and the upper end of the lower joint 55 is inserted into the lower end of the upper joint 51 to realize threaded engagement. A guide sleeve 52 is provided in the upper sealer bore, an upper annular seal is provided in the upper sealer bore, and the guide sleeve 52 is located above the upper annular seal.

The guide sleeve 52 and the upper annular sealing member are both positioned in the lower joint 55, an outer baffle edge 524 is arranged on the outer peripheral surface of the guide sleeve 52, an inward convex inner baffle edge 511 is arranged in the upper joint 51, and the outer baffle edge 524 is clamped between the lower end surface of the inner baffle edge 511 of the upper joint 51 and the upper end surface of the lower joint 55 so that the guide sleeve 52 is fixed. The inner peripheral surface of the inner baffle edge 511 of the upper joint 51 is provided with a chamfer which is inclined from top to bottom to the inside, the chamfer is positioned above the inner peripheral surface of the guide sleeve 52, and the chamfer is used for centering and guiding the inner tube before entering the guide sleeve 52, thereby facilitating the inner tube to enter the guide sleeve 52.

The inner peripheral surface of the guide sleeve 52 is provided with an upper guide section 521, a guide conical surface 523 and a lower guide section 522 which are distributed up and down, the inner diameter of the upper guide section 521 is larger than that of the lower guide section 522, the inner diameter of the lower guide section 522 is larger than that of the upper annular sealing element, the guide conical surface 523 is large and small up and down and is used for centering and guiding the inner tube entering the guide sleeve 52, and the inner tube is facilitated to enter the upper annular sealing element.

The upper annular sealing member comprises an annular support 53 and a rubber sealing ring 54, wherein the rubber sealing ring 54 is arranged on the inner peripheral surface of the annular support 53, in the embodiment, the rubber sealing ring 54 is combined with an annular groove on the inner peripheral surface of the annular support 53 in a vulcanization mode, so that the annular support 53 is a vulcanized steel member, the rubber sealing ring 54 is vulcanized rubber, the rubber sealing ring 54 is tightly adhered to the inner peripheral surface of the annular support 53, and when the cannula 3 is lifted or lowered, the rubber sealing ring 54 is not easy to fall off and damage under the condition that pressure difference exists between the upper side and the lower side of the rubber sealing ring 54, so that the effective period is prolonged. The outer peripheral surface of the annular support 53 is provided with an outer seal ring groove 531, and a seal ring which is in sealing fit with the inner peripheral surface of the lower joint 55 is installed in the outer seal ring groove 531.

The working principle of the embodiment of the upper sealer of the utility model is: after the cannula 3 is inserted into the upper sealer 5, the cannula 3 passes through the upper joint 51 and the guide sleeve 52 to enter the upper annular sealer, the sealing matching section of the cannula 3 is contacted with the rubber sealing ring 54 of the upper annular sealer to realize sealing, the upper side and the lower side of the upper annular sealer in the upper sealer 5 are sealed into an upper sealing pressure system and a lower sealing pressure system, and after the cannula 3 is pulled out of the upper sealer 5, the upper sealer 5 is changed into a pressure system.

Claims

1. An upper sealer is arranged in a release outer pipe of a cannula water shutoff pipe column and is characterized by comprising an upper sealer inner hole, wherein the upper sealer inner hole is used as a part of a central channel in the release outer pipe and can be inserted through a cannula (3) of the cannula water shutoff pipe column, and a guide sleeve (52) and an upper annular sealing piece which are distributed up and down are arranged in the upper sealer inner hole; the upper annular sealing element is used for realizing sealing with the smooth outer wall of the cannula (3) through circumferential sealing fit, an upper guide section (521), a guide conical surface (523) and a lower guide section (522) which are distributed up and down are arranged on the inner circumferential surface of the guide sleeve (52), the inner diameter of the upper guide section (521) is larger than that of the lower guide section (522), the inner diameter of the lower guide section (522) is larger than that of the upper annular sealing element, and the guide conical surface (523) is large up and down and is used for centering and guiding the cannula (3) entering the guide sleeve (52).

2. The upper sealer according to claim 1, characterized in that the upper annular seal member includes an annular bracket (53) and a rubber seal ring (54), the rubber seal ring (54) being provided on an inner peripheral surface of the annular bracket (53).

3. The upper sealer according to claim 2, characterized in that the rubber seal ring (54) is vulcanization-bonded to a ring groove on an inner peripheral surface of the ring-shaped bracket (53), the ring-shaped bracket (53) is a vulcanized steel member, and the rubber seal ring (54) is vulcanized rubber.

4. The upper sealer according to claim 2, characterized in that the outer circumferential surface of the annular bracket (53) is provided with an outer sealing ring groove (531), and a sealing ring which is in sealing fit with the inner circumferential surface of the inner hole of the upper sealer is installed in the outer sealing ring groove (531).

5. The upper sealer according to any one of claims 1-4, characterized in that the upper sealer comprises an upper joint (51), a lower joint (55), the upper joint (51), the lower joint (55) being hollow tubular and forming the upper sealer bore in the upper sealer, the guide sleeve (52), the upper annular seal being in the lower joint (55).

6. The upper sealer according to claim 5, characterized in that the upper joint (51) is provided at an upper end with an internal thread for connection with a connection pipe, and the lower joint (55) is provided at a lower end with an external thread for connection with a connection pipe.

7. The upper sealer according to claim 5, characterized in that the lower end of the upper joint (51) and the upper end of the lower joint (55) are screwed together.

8. The upper sealer according to claim 7, characterized in that the lower end of the upper joint (51) is provided with an internal thread, the upper end of the lower joint (55) is provided with an external thread, and the upper end of the lower joint (55) is inserted into the lower end of the upper joint (51) to achieve screw-fitting.

9. The upper sealer according to claim 8, wherein an outer stopper edge (524) is provided on an outer peripheral surface of the guide bush (52), an inward protruding inner stopper edge (511) is provided inside the upper joint (51), and the outer stopper edge (524) is sandwiched between a lower end surface of the inner stopper edge (511) of the upper joint (51) and an upper end surface of the lower joint (55) to fix the guide bush (52).

10. The upper sealer according to claim 9, characterized in that the inner peripheral surface of the inner flange (511) of the upper joint (51) is provided with a chamfer inclined from top to bottom from outside to inside, the chamfer being located above the inner peripheral surface of the guide sleeve (52), the chamfer being used for centering and guiding the cannula (3) before entering the guide sleeve (52).