Remote-control electro-hydraulic driving back-pressure valve and control method thereof
A control method and remote control technology, which is applied in the field of electro-hydraulic drive back pressure valve and its control, can solve the problems that the liquid column pressure in the pipe cannot pass through the pressure transmission hole, the liner hanger cannot be mounted, etc., so as to achieve reliable switching, Avoid corrosion, simple operation effect
Inactive Publication Date: 2018-08-28
JIANGSU AERO SPACE HONGPENG NUMERICAL CONTROL MACHINERY
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Problems solved by technology
The biggest problem with this method of sitting and hanging is that the inner wall of the liner hanger needs to be provided with pressure transmission holes, which are connected to the liquid in the pipe, and the pressure of the liquid column in the pipe acts on the slips through the pressure transmission holes. Due to the blockage due to the many impurities in the downhole, the pressure of the liquid column in the pipe cannot be applied to the slips through the pressure transmission hole, resulting in the problem that the liner hanger cannot be mounted; on the other hand, if the liner hanger is in the process of going into the well When the pressure in the pipe increases abnormally, the liner hanger will be suspended in advance, which will bring unnecessary downhole complications
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[0022] 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.
[0023] Such as figure 1 and figure 2Shown is a remote-controlled downhole back pressure valve and its string connection. The downhole back pressure valve includes a pressure wave receiving device, a drive system and a back pressure valve, the pressure wave receiving device includes a downhole pressure sensor 17, a control circuit board 15 and an instruction output unit, the ...
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The invention discloses a remote-control electro-hydraulic driving back-pressure valve and a control method thereof. The control method includes: a, connecting a downhole back-pressure valve into a pipe string; b, lowering the pipe string obtained in the step a into a well, connecting a pump pipe of a ground pumper with a wellhead, and when the downhole back-pressure valve needs to be opened and closed, generating regular pressure change at the wellhead on the ground through the ground pumper; c, when the pressure change is responded to the bottom of the well, opening and closing the downholeback-pressure valve. Through a remote-control hydraulic tail pipe suspender and a control method, remote control of the downhole back-pressure valve on the ground by means of sending pressure waves for communication can be realized. The method meets requirements on remote control, operation simplicity and opening-closing reliability at the same time, and the problem that springs are prone to corrosion and blockage and low in reliability in the prior art can be avoided effectively.
Description
technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to an electro-hydraulic driven back pressure valve through remote control and a control method thereof. Background technique [0002] During the liner cementing process, the liner hanger needs to be hung on the upper casing through the slip seat to support the lower connected liner. The currently used general liner hanger set-up method is to hold the pressure at the wellhead, use the pressure difference of the liquid column inside and outside the pipe to push the slips to move upwards, and hang the slips on the upper casing. The biggest problem with this method of sitting and hanging is that the inner wall of the liner hanger needs to be provided with pressure transmission holes, which are connected to the liquid in the pipe, and the pressure of the liquid column in the pipe acts on the slips through the pressure transmission holes. Due to the blockage due to the...
Claims
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IPC IPC(8): E21B34/16
CPCE21B34/16
Inventor 陈燕杨清海王斌李权姜领
Owner JIANGSU AERO SPACE HONGPENG NUMERICAL CONTROL MACHINERY