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Hydraulic liner releaser and release method for oil and gas wells

A technology for oil and gas wells and releasers, which is applied in earthwork drilling, wellbore/well components, sealing/isolation, etc. It can solve the difficulties of liner release and identification, failure to disengage liner with carrying liner, difficulty in guaranteeing construction quality, etc. problems, to achieve easy expansion locking and contraction reset, avoid sticking straps and buckling difficulties, and achieve reliable locking effects

Active Publication Date: 2010-10-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing tail pipe hanger and tail pipe release method mainly have the following disadvantages: 1. Since the liquid inlet hole of the hanger liquid cylinder is connected with the internal circulation channel, it is easy to block the liquid cylinder with slurry debris or the circulation pressure makes the liquid cylinder advance 2. In some wells, the phenomenon that the tailpipe is not separated when the drilling is pulled out in the later stage of construction, and the implementation of the suspension weight discrimination method is difficult to operate, and the additional cost is high. In order to obtain the weight of the tailpipe drill string And related data need to be tripped and tested in advance, which takes time and resources, and the construction quality is difficult to guarantee
3. Due to the short stern tube column and light weight, using the existing stern tube hanger can only rely on changes in the weight of the stern tube suspension and the number of rotations or torque changes to determine whether the stern tube release is successful, and mistakes often occur, especially It is very difficult to release and identify the liner in directional deviated wells, horizontal wells and complex wells

Method used

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  • Hydraulic liner releaser and release method for oil and gas wells
  • Hydraulic liner releaser and release method for oil and gas wells
  • Hydraulic liner releaser and release method for oil and gas wells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A hydraulic tailpipe releaser for oil and gas wells, including a housing 18, an insertion pipe 1, a locking mechanism and an unlocking mechanism. One end of the housing 18 is sealed and connected to the hanger double male short-connect 6, and the other end is sealed with the tail pipe short-connect 19. connection; one end of the insertion pipe 1 is sealed and connected with the drill pipe short 30, and the other end is connected with the locking mechanism arranged in the housing 18, and the insertion pipe 1 is provided with a pressure transmission hole 3 leading to the hydraulic cylinder; The lock mechanism includes a lock sleeve 11, a reset lock lock 12, a support seat 13, a lock cap 24 and a lock cylinder 26. One end of the lock sleeve 11 is sealed between the insertion tube 1 and the hanger double male short-circuit 6, and the other end is located at the support base. 13, the upper end of the reset lock hanger 12 is connected with the insertion tube 1 and the lower en...

Embodiment 2

[0052] The invention includes a shell, an insertion tube, a locking mechanism and an unlocking mechanism. The upper end of the housing 18 is threaded to the lower end of the double male short connector 6 of the hanger, the lower end of the housing 18 is connected to the tailpipe short connector 19 by threads, and the insertion pipe 1 is connected by a locking mechanism in the housing 18. The insertion pipe 1 is threadedly connected to the lower end of the drill pipe short connection 30, the insertion pipe 1 is inserted into the hanger, and its upper part forms a sealing structure with the hanger sealing sleeve 28, and the lower part of the insertion pipe 1 is provided with a pressure transmission hole leading to the hanger hydraulic cylinder 3 and link to each other with unlocking mechanism and locking mechanism.

[0053] The locking mechanism is composed of a lock sleeve 11, a reset lock lock 12, a support seat 13, a lock cap 24, and a lock cylinder 26. The lower end is loca...

Embodiment 3

[0061] In the release method of the present invention, controlling the hydraulic pressure includes controlling the hydraulic pressure inside the liner drill string, inside the drill pipe short and inside and outside the insertion pipe, and lifting the drill string includes lifting the drill string on the wellhead to leave the wellhead rotary table surface. Measuring the lifting degree includes measuring the height of the lifting drill string from the wellhead turntable surface, so that the pressure transmission hole at the lower part of the insertion pipe moves up with the drill string to the seal sleeve of the hanger, so as to achieve the communication and discharge of the inside and outside of the drill string. When it is lifted to a certain height, it can be judged whether the insertion tube is disconnected from the tail pipe connection, that is, whether the tail pipe release is successful or not, by observing the change of the pressure gauge.

[0062] During implementation,...

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PUM

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Abstract

The invention discloses a hydraulic liner releaser and a hydraulic liner release method for oil and gas wells. One end of a shell of the releaser of the invention is connected with a dual-male pup joint of a hanger in a sealed way, while the other end is connected with the pup joint of a liner in a sealed way; and one end of an insert pipe is connected with the pup joint of a drill stem in a sealed way, while the other end is connected with a locking mechanism which is arranged in the shell, a pressure transfer hole which leads to a hydraulic cylinder is formed on the insert pipe, and a release mechanism is arranged in the insert pipe. In the invention, the liner is placed in the well by adopting the resetting lock-connection control of a liner column and a drill column and the blockage control of the pressure transfer hole first; then the liner is released in a mode that the release mechanism releases the blockage under a hydraulic pressure to perform hanging operation and release the resetting lock; and finally the separation of the liner is determined by a method of extracting the drill column under a controlled pressure and observing the pressure change of the drill column. The hydraulic liner releaser and the hydraulic liner release method suitable for the construction of liner hanging and cementing of deep wells, ultra deep wells, inclined wells and horizontal wells are convenient to operate, safe and reliable and strengthen the use effect of a liner hanger.

Description

technical field [0001] The invention relates to an oil and gas well hydraulic liner release device and a release method, which are used for the release control of the oil and gas well cementing liner. Background technique [0002] In the prior art, more and more short liner suspension cementing methods within 500 meters are used in deep wells, ultra-deep wells, deviated wells, and horizontal wells of oil and gas wells. For example, Chinese Patent No. "200620138318.7" discloses a single-ball hydraulic breakaway liner hanger. Its application date is September 22, 2006, and its authorization announcement date is November 28, 2007. There is a liquid inlet hole between the center tube and the body of the hanger, and a channel for a movable rubber plug is formed between the outer cylinder and the body. The liquid inlet hole is connected with the channel of the movable rubber plug. It is connected with the fixing screw, and the circulation mechanism is connected with the setting m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B23/01E21B23/08E21B33/13
Inventor 陈玉书
Owner BC P INC CHINA NAT PETROLEUM CORP
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