Search

CN-119021592-B - Underground isolation device

CN119021592BCN 119021592 BCN119021592 BCN 119021592BCN-119021592-B

Abstract

The invention belongs to the technical field of oil-gas well testing tools, and particularly relates to an underground isolation device. The underground isolation device comprises an outer cylinder, a switch valve and a switch sleeve, wherein the switch valve and the switch sleeve are arranged in the outer cylinder, the underground isolation device further comprises an insertion joint, the upper end of the switch sleeve is connected with the lower end of the insertion joint through an elastic claw, the elastic claw is radially abutted by the outer cylinder in the initial state, the insertion joint moves upwards in the releasing process to drive the elastic claw and the switch sleeve to move upwards, the elastic claw is separated from the abutment with the outer cylinder after the switch sleeve closes the switch valve, so that the elastic claw can radially expand under the relative action of the insertion joint, the insertion joint is separated from the switch sleeve, and the insertion joint can move reversely and is connected with the switch sleeve through the elastic claw again. The invention can repeatedly execute the action of closing and opening.

Inventors

  • LIU YINTAO
  • LIU XIAOFENG
  • LI HONG
  • CHEN CHEN
  • SU BIAO
  • DONG HAIFENG

Assignees

  • 中国石油化工股份有限公司
  • 中国石油化工股份有限公司西南油气分公司

Dates

Publication Date
20260512
Application Date
20230526

Claims (9)

  1. 1. The utility model provides an isolating device in pit, includes urceolus (1), sets up ooff valve (2) and ooff sleeve (3) in urceolus (1), ooff sleeve (3) are located the top of ooff valve (2), ooff sleeve (3) upwards or move down can drive ooff valve (2) are closed or are opened, its characterized in that, isolating device in pit still includes: The upper end of the switch sleeve (3) is connected with the lower end of the plug-in connector (4) through an elastic claw (6), A sealing ball seat (31) is arranged in the switch sleeve (3), a sealing ring is arranged between the switch sleeve (3) and the outer cylinder (1), Wherein, in the initial state, the elastic claw (6) is radially abutted by the outer cylinder (1), In the releasing process, the inserting joint (4) moves upwards to drive the elastic claw (6) and the switch sleeve (3) to move upwards, after the switch sleeve (3) closes the switch valve (2), the elastic claw (6) is separated from abutting with the outer cylinder (1), so that the elastic claw (6) can expand radially under the opposite action of the inserting joint (4), and the inserting joint (4) is separated from the switch sleeve (3), The plug-in connector (4) can move reversely, is connected with the switch sleeve (3) again through the elastic claw (6), after the lower end of the plug-in connector is inserted into the elastic claw, the plug-in connector can move relatively to the shaft within the length range of the elastic claw, when the plug-in connector enters the elastic claw and is connected with the connecting nipple (12) of the outer cylinder (1) in a threaded connection mode, the ball is pressed out in the switch sleeve (3) to form a seal with the sealing ball seat (31), and the pressure is pressed out in the switch sleeve, so that the switch sleeve moves downwards, and the switch valve is opened.
  2. 2. Downhole isolation device according to claim 1, wherein the plug-in connection (4) and the switching sleeve (3) are relatively axially movable over the length of the resilient claw (6) after the plug-in connection (4) is connected with the switching sleeve (3) by the resilient claw (6).
  3. 3. A downhole isolation device according to claim 2, wherein the elastic claw (6) is fixedly arranged at the upper end of the switch sleeve (3), an inwardly protruding inner tooth (61) is arranged at the upper end of the elastic claw (6), an outer tooth (41) cooperating with the elastic claw (6) is arranged at the lower end of the plug-in connector (4), and the inner tooth (61) is arranged above the outer tooth (41) when the lower end of the plug-in connector (4) abuts against the upper end of the switch sleeve (3).
  4. 4. A downhole isolation device according to claim 1, wherein the outer cylinder (1) is provided with a stepped bore, the resilient fingers (6) being located at a minor diameter of the outer cylinder (1) in an initial state so as to radially abut against the resilient fingers (6), the resilient fingers (6) following the plug-in connection (4) to a major diameter of the outer cylinder (1) in a released state so as to release the radial abutment of the resilient fingers (6).
  5. 5. A downhole isolation device according to any of claims 1-4, wherein a first circulation hole (32) is provided in the wall of the switch sleeve (3), a second circulation hole (11) is provided in the wall of the outer cylinder (1), the first circulation hole (32) and the second circulation hole (11) are dislocated in the initial state, and the first circulation hole (32) coincides with the second circulation hole (11) after the plug-in connector (4) drives the switch sleeve (3) to move upwards through the elastic claw (6).
  6. 6. A downhole isolation device according to claim 5, wherein at least two sealing rings for sealing with the outer cylinder (1) are arranged on the outer wall of the switch sleeve (3), the two sealing rings being arranged on the upper and lower sides of the first circulation hole (32), respectively.
  7. 7. A downhole isolation device according to any of claims 1-4, wherein a protrusion for preventing the switch sleeve (3) from being detached from the outer cylinder (1) from above is provided on an inner wall of the outer cylinder (1).
  8. 8. A downhole isolation device according to any of claims 1-4, wherein threads for connection with the outer barrel (1) are provided on the outer wall of the plug-in connection (4).
  9. 9. A downhole isolation device according to any of claims 1-4, wherein a sealing ring is arranged between the plug-in connection (4) and the outer barrel (1).

Description

Underground isolation device Technical Field The invention belongs to the technical field of oil-gas well testing tools, and particularly relates to an underground isolation device. Background The high-pressure oil and gas exploratory well test is carried out for secondary well completion by adopting a well killing pipe string replacement mode after obtaining, but because the well killing damages a reservoir, the underground isolation device is adopted to carry out temporary sealing on the oil and gas well after the test is finished, so that the method is a novel operation means for quickly transferring the exploratory well test to an evaluation well. However, the existing underground isolation device can only perform one-time closing and opening actions, cannot adapt to complex working conditions, and repeatedly performs multiple closing and opening actions. In addition, the existing underground isolation device generally adopts a tubing string to drive a switching tool to mechanically switch in a lifting and lowering mode. Therefore, during the opening of the downhole isolation device, the entire tubing string that drives the switching tool is required to move axially. In the process, the tubing string is required to have a certain axial movement space, so that the gas production tree cannot be directly installed, and a blowout preventer is required to be installed at a wellhead, so that the tubing string is prevented from spraying underground fluid when the tubing string drives the switching tool to open the isolating device. After the isolating device is opened, the gas production tree is installed, so that the next work can be carried out. Disclosure of Invention The present invention aims to provide a downhole isolation device capable of repeatedly executing closing and opening actions. According to the invention, there is provided an underground isolation device, comprising an outer cylinder, a switch valve and a switch sleeve, wherein the switch valve and the switch sleeve are arranged in the outer cylinder, the switch sleeve is positioned above the switch valve, and the switch sleeve can drive the switch valve to be closed or opened by moving upwards or downwards, and the underground isolation device is characterized in that the underground isolation device further comprises: The upper end of the switch sleeve is connected with the lower end of the plug-in connector through an elastic claw, wherein, In the initial state, the elastic claw is radially abutted by the outer cylinder, In the releasing process, the inserting joint moves upwards to drive the elastic claw and the switch sleeve to move upwards, the elastic claw is separated from the abutting joint with the outer cylinder after the switch sleeve closes the switch valve, so that the elastic claw can expand radially under the relative action of the inserting joint, and the inserting joint is separated from the switch sleeve, The plug-in connection can be connected to the switching sleeve by a reverse movement, again by the spring claw. In a specific embodiment, a sealing ball seat is arranged in the switch sleeve, and a sealing ring is arranged between the switch sleeve and the outer cylinder. In a specific embodiment, the plug-in connection and the switching sleeve are movable relative to each other over the length of the elastic claw after the plug-in connection has been connected to the switching sleeve by the elastic claw. In a specific embodiment, the elastic claw is fixedly arranged at the upper end of the switch sleeve, internal teeth protruding inwards are arranged at the upper end of the elastic claw, external teeth matched with the elastic claw are arranged at the lower end of the insertion joint, and when the lower end of the insertion joint is abutted with the upper end of the switch sleeve, the internal teeth are located above the external teeth. In a specific embodiment, a stepped hole is formed in the outer cylinder, the elastic claw is located at the small diameter of the outer cylinder in an initial state, so that the elastic claw is radially abutted, and the elastic claw moves to the large diameter of the outer cylinder along with the insertion connector in a releasing state, so that the radial abutment of the elastic claw is relieved. In a specific embodiment, a first circulation hole is formed in the wall of the switch sleeve, a second circulation hole is formed in the wall of the outer cylinder, the first circulation hole and the second circulation hole are dislocated in an initial state, and after the plug-in connector drives the switch sleeve to move upwards through the elastic claw, the first circulation hole and the second circulation hole are overlapped. In a specific embodiment, at least two sealing rings for sealing with the outer cylinder are arranged on the outer wall of the switch sleeve, and the two sealing rings are respectively arranged on the upper side and the lower side of the first circulation hole. In a s