Snubbing downhole control valve
A technology for controlling valves and killing wells, which is applied to wellbore/well valve devices, wellbore/well parts, earthwork drilling and production, etc. It can solve the problems of inconvenient operation and control valve out of control, etc., achieve reasonable structure and improve work efficiency , The effect of saving auxiliary work time
Active Publication Date: 2012-10-17
DAGANG OIL FIELD GRP +1
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Problems solved by technology
[0005] In order to overcome the disadvantages of existing downhole control valves that need to rely on the up and down movement of the tubing string to control the switch of the control valve, which is not easy to operate, and the control valve is out of control due to the breakage of the sucker rod, the present invention provides a snubbing downhole control valve. The snubbing downhole control valve combines the functions of the bottom valve of the oil pump and the downhole switch into one. It does not need to change the structure of the oil well pump. The downhole fluid flow can be controlled by lifting or lowering the tubing string in one trip. The opening and closing of the pipe string has the functions of blowout prevention, well washing, production and oil drainage, and avoids the control valve out of control caused by the sucker rod breakage
Method used
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[0012] Attached below figure 1 ~attached image 3 and Examples to further illustrate the present invention.
[0013] The snubbing downhole control valve of the present invention mainly includes a movable pipe string 24 and a fixed pipe string 25 . The movable pipe string 24 is located in the fixed pipe string 25 and can slide axially along the fixed pipe string 25 .
[0014] The moving pipe string 24 is, from top to bottom, an upper check valve 22 , a connecting sleeve 7 , a lower check valve 23 , and a spring seat 14 . The upper check valve body 1 , the connecting sleeve 7 , the lower check valve body 10 , and the spring seat 14 are fixedly connected in sequence from top to bottom. The upper check valve body 1 is provided with a blocking ball ring 29 in the middle, and the blocking ball ring 29 is provided with an axial flow-through hole 17; the upper check valve valve seat 19 is fixedly installed between the upper check valve body 1 and the connecting sleeve 7 , the upper...
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The invention relates to a snubbing downhole control valve, which aims to overcome the defects that a switch of the control valve is required to be controlled by the up and down motion of an oil string, the operation of descending the string is complex and the parting of a sucker rod can cause the loss of control of the control valve existing in the prior downhole control valve. A movable pipe string (24) is arranged a fixed pipe string (25); the movable pipe string (24) is sequentially provided with an upper single-flow valve (22), a connecting sleeve (7), a lower single-flow valve (23) and a spring seat (14) from top to bottom; an upper single-flow valve body (1), the connecting sleeve (7), a lower single-flow valve body (10) and the spring seat (14) are sequentially and fixedly connected from top to bottom; and the fixed pipe string (25) is provided with a pressure cap (2), a sealing shell (6), an outer cylinder (15) and a lower connector (16) from top to bottom, which are fixedly connected sequentially. The snubbing downhole control valve has the advantage of reasonable structure, has good functions of opening and closing, and can complete the mutual conversion of the oil welloperation and the oil pumping production by using one string.
Description
Technical field [0001] The invention relates to a tool for oil and gas development and production and downhole operation, in particular to a snub-free downhole control valve. Background technique [0002] In oil extraction operations, oil wells with high formation pressure have a certain self-spraying ability, and a certain proportion of mud or clean water is often required to kill wells. Sometimes well killing operations may cause oil layer pollution and block effective pores due to improper construction or design. reduce the seepage area, reduce the production rate of oil production, reduce the production of oil wells, and increase the operating cost. In order to avoid damage to the oil layer, downhole switches are often used to replace well killing operations in construction operations. The downhole switch is installed between the oil pump and the fixed valve, and the up and down reciprocating motion of the sucker rod is used to control the opening or closing of the liqui...
Claims
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IPC IPC(8): E21B34/06
Inventor 李志广黄大云李川陈敏义刘华
Owner DAGANG OIL FIELD GRP