Downhole controllable one-way valve and control method

A one-way valve, controllable technology, applied in wellbore/well valve device, earthmoving, wellbore/well components, etc., can solve the valve disc erosion damage, well control risk, tubing plugging function Failure and other problems, to achieve the effect of extending the service life

Pending Publication Date: 2020-04-17
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] In order to overcome the existing problem that the sand-carrying fluid is in direct contact with the valve disc during sand fracturing, which may easily cause erosion and damage to the valve disc, and furthermore, the sealing function in the tubing will fail, resulting in the risk of well control. The present invention provides a downhole Controllable one-way valve and control method, the disc of the present invention can be hidden in the shell during the fracturing process, which ensures a high service life of the one-way valve, and can be blocked and opened by balling on the ground to suppress pressure switching, realizing the anti-circulation function

Method used

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  • Downhole controllable one-way valve and control method

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Embodiment 1

[0024] In order to overcome the existing problem that the sand-carrying fluid is in direct contact with the valve disc during sand fracturing, which may easily cause erosion and damage to the valve disc, and furthermore, the sealing function in the tubing will fail, resulting in the risk of well control. The present invention provides such figure 1 An underground controllable one-way valve and its control method are shown. The present invention realizes free switching between the plugging state in the tubing and the pumping construction state by throwing balls on the ground to suppress the pressure. Connect the joints to ensure that the disc will not be eroded and damaged, effectively prolonging its service life. The blocking and opening state can be switched by holding the ball on the ground, realizing the reverse circulation function.

[0025] A downhole controllable one-way valve, comprising a connecting joint 1 and a lower joint 12, the lower end of the connecting joint 1 ...

Embodiment 2

[0028] Based on Embodiment 1, in this embodiment, the connecting joint 1 is sealed and fixedly connected with the lower joint 12, and the connecting joint 1 and the lower joint 12 are provided with steps, and the track pipe 6 and the disc seat 11 Axial fixation is realized under the step limit between the connecting joint 1 and the lower joint 12.

[0029] The control cylinder 2 and the limit ring 5 are screwed and fixedly connected, and the reversing ring 3 is axially fixed under the step limit between the control cylinder 2 and the limit ring 5, and one end of the reversing nail 4 is embedded in the In the circular perforation of the reversing ring 3, the other end is embedded in the track groove of the track tube 6.

[0030] Further, the connecting joint 1 and the inner cavity of the track tube 6 are sequentially sleeved with a control cylinder 2, a reversing ring 3, a reversing nail 4, a limit ring 5, a spring 7, a control cylinder 2 and a limiter. The ring 5 is fixedly c...

Embodiment 3

[0044] On the basis of Embodiments 1 and 2, a downhole controllable check valve control method is provided in this embodiment, and the specific steps are:

[0045]During pump injection or backwash well construction, the outer wall of the lower end of the check valve inner control tube 2 contacts the inner wall of the lower joint 12, the spring 7 is in a compressed state, the reversing nail 4 is in the short groove of the track tube 6, and the valve disc 10 is recovered in the Between the outer wall of the lower end of the control cylinder 2 and the inner wall of the connecting joint 1, at this time, the one-way valve ensures sufficient inner diameter, and the valve disc 10 is never in contact with the sand-carrying fluid injected by the pump, so as to ensure that the valve disc 10 is not damaged by erosion;

[0046] When it is necessary to adjust the drilling tool under pressure or prevent blowout in the oil pipe, the ball in the oil pipe is located on the upper slope of the co...

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Abstract

The invention provides a downhole controllable one-way valve and a control method. The downhole controllable one-way valve comprises a connector and a lower connector. The lower end of the connector is connected with the lower connector, and a track pipe and a valve clack seat are sequentially sleeved with the connector and the lower connector; a control barrel, a reversing ring, a reversing nail,a limiting ring and springs are sequentially sleeved with inner cavities of the connector and the track pipe from top to bottom; and a valve clack is arranged on the valve clack seat. A blocking state and a pump injection construction state in an oil pipe are freely switched through ground delivery pressure keeping, the valve clack is hidden between the control barrel and the connector in the pump injection construction state, it is guaranteed that the valve clack is not subjected to washout damage, and the service life of the valve is effectively prolonged.

Description

technical field [0001] The invention relates to a downhole controllable one-way valve and a control method, which are used for plugging oil pipes after fracturing or drilling operations, and belong to the technical field of oil and gas field reservoir transformation. Background technique [0002] In the technical field of downhole tools for oil and gas field development, disc-type check valves are usually used as a measure to block the tubing after fracturing or drilling, so as to realize the pressure adjustment string after construction and the blowout prevention function in the tubing. This disc type check valve does not have the function of reverse circulation, so it cannot be used in the working condition that requires reverse circulation. At the same time, the core of the sealing mechanism blocked in the tubing is the valve disc. During sand fracturing, the sand-carrying fluid and The direct contact of the valve disc can easily cause erosion damage to the valve disc, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B34/08E21B34/14E21B43/26
CPCE21B34/08E21B34/14E21B43/26
Inventor 田文超张文李星星隆世明李景彬叶忠汉张波宫娜娜张海涛何炜李铭崔向敏李继宏
Owner BC P INC CHINA NAT PETROLEUM CORP
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