Coal reservoir protection device
A protection device, a technology for coal reservoirs, applied in the fields of production fluids, wellbore/well components, earth-moving drilling, etc., can solve the problems of long recovery time, long waiting time for workover, etc., so as to shorten the recovery time and shorten the waiting time. The effect of well workover time
Active Publication Date: 2018-03-13
PETROCHINA CO LTD +2
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Problems solved by technology
[0005] In order to solve the problem of long waiting time for workover and long recovery time after workover, the present invention provides a coal reservoir protection device
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[0036] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0037] The embodiment of the present invention provides a coal reservoir protection device 01, which is applied to coalbed methane wells and is used in conjunction with the Y445 hand-off packer 02, such as figure 1 As shown, the upper end of the coal reservoir protection device 01 is fixedly connected with the lower end of the Y445 hand-off packer 02, and then lowered into the casing 03 of the coalbed methane well, and the upper part of the coal reservoir of the coalbed methane well is set for sealing. Then run into the production string composed of tubing 04 and oil well pump 05 to complete normal drainage and workover operations. Specifically, such as figure 2 As shown, the coal reservoir protection device 01 includes: a fixed valv...
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The invention discloses a coal reservoir protection device, belonging to the technical field of oilfield mechanical oil recovery, comprising: a fixed valve assembly, a valve joint, a valve core, a collar, a spring outer tube, a spring, a limit ring and an adjustment bolt; The upper end of the valve joint is fixedly connected with the lower end of the fixed valve assembly; the upper end of the valve core is fixedly connected with the lower end of the valve core; the collar is sleeved on the outside of the valve joint, and the lower end is fixedly connected with the upper end of the spring outer tube; A spring is arranged in the annular space, and the outer tube of the spring is in contact with the valve core at the lower end of the annular space; the adjustment bolt is fixedly connected with the valve core, and the lower end is in contact with the upper end of the spring; the limit ring is sleeved on the outside of the valve core, and the maximum diameter is larger than the maximum Diameter; a liquid inlet hole is set on the outer wall of the valve core cavity, and a through hole is set on the spring outer tube. The invention solves the problems of long waiting time for workover and long recovery time after workover, realizes the effects of shortening waiting time for workover and shortening recovery time after workover, and is used for coal reservoir protection.
Description
technical field [0001] The invention relates to the technical field of oil field mechanical oil recovery, in particular to a coal reservoir protection device. Background technique [0002] In the process of oil and gas field development and workover, in order to protect the reservoir of oil and water wells or reduce the overflow of reservoir fluid to the surface, it is often necessary to carry out workover under pressure. Workover operations performed under pressure at the wellhead. Similarly, in order to protect the coal reservoir of the coalbed methane well, it is also necessary to carry out workover operations on the coalbed methane well. Although theoretically it can be applied to coalbed methane wells by improving the workover device under pressure in the process of oil and gas field development and workover, but because the device occupies a relatively large area, the structure is relatively complicated, and the operation is relatively complicated. It is cumbersome a...
Claims
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IPC IPC(8): E21B43/00
Inventor 王凤清徐贵东张康党晓俊王辰龙刘国强
Owner PETROCHINA CO LTD