Anti-overflow self-start downhole back-pressure valve
A self-starting and anti-overflow technology, which is applied to wellbore/well valve devices, wellbore/well components, measurement, etc., can solve the problems of affecting elastic performance, affecting spring expansion and contraction, and many impurities, so as to meet the requirements of real-time monitoring , Avoid corrosion, simple operation
Inactive Publication Date: 2018-09-11
JIANGSU AERO SPACE HONGPENG NUMERICAL CONTROL MACHINERY
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- Description
- Claims
- Application Information
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Problems solved by technology
The biggest problem of this kind of back pressure valve in underground use is that its reliability is not high, because the spring itself is easy to rust, which affects its elastic performance. It will directly affect the use effect of the back pressure valve, and further affect the safety of the lower pipe string and the downhole construction process.
Method used
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[0017] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "inner" and "outer ” refer to directions towards or away from the geometric center of a particular part, respectively.
[0018] Such as figure 1 and figure 2 Shown is a downhole back pressure valve 21 and its pipe string connection method, image 3 Shown is the control principle diagram of the downhole back pressure valve 21 . The downhole back pressure valve 21 includes an upper joint 1, a sealing ring, a motor outer casing 3, a motor inner casing 4, a coupling sleeve 5, a downhole battery 6...
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The invention discloses an anti-overflow self-start downhole back-pressure valve. The anti-overflow self-start downhole back-pressure valve comprises an upper connector, a sealing ring, a motor outershell, a motor inner shell, a connecting sleeve, a downhole battery, a gas sensor, a motor rotor, a downhole circuit board, a downhole pressure sensor, a lower connector, an outer sleeve, a ball seatand an isolation ball. According to the anti-overflow self-start downhole back-pressure valve, the downhole gas overflow condition can be monitored in real time under a well, and the downhole back-pressure valve can be self-started; a method can simultaneously meet the requirements that downhole overflow real-time monitoring is achieved, operation is easy, and switching on and off are reliable, and the problems that in the prior art, springs are easily corroded and blocked, the reliability is not high, and downhole overflow real-time monitoring cannot be achieved can be effectively avoided.
Description
technical field [0001] The invention relates to the technical field of drilling in oil and gas fields, in particular to an anti-overflow self-starting downhole back pressure valve. Background technique [0002] In the process of running down the pipe string and downhole construction, when encountering downhole abnormally high-pressure oil and gas formations, if the bottom hole pressure is lower than the formation pressure, it will cause downhole complex situations such as overflow or even blowout; at this time, in order to avoid such downhole complex situations Occurs, a back pressure valve is usually installed at the lower end of the downhole tubing string to prevent formation fluid from entering the tubing string upwards. At present, the common back pressure valve in the well adopts the floating ball type, and relies on the elastic supporting ball of the spring to realize automatic opening and closing. The biggest problem of this kind of back pressure valve in underground...
Claims
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Login to View More IPC IPC(8): E21B34/06E21B47/06
CPCE21B34/066E21B47/06
Inventor陈燕杨清海王斌李权姜领
OwnerJIANGSU AERO SPACE HONGPENG NUMERICAL CONTROL MACHINERY