Sleeve pressure valve with stable sealing performance
A pressure-resistant and sealing technology, which is applied in wellbore/well components, earthwork drilling, flushing wellbore, etc., can solve the problem that the backwash valve’s sealing performance is easily affected by impurities, and achieve the effect of improving the sealing performance
Active Publication Date: 2018-11-16
DRILLING TECH DEV CO LTD OF TIANJIN DAGANG OILFIELD PETROLEUM ENG INST +2
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- Application Information
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Problems solved by technology
[0003] In view of this, the present invention aims to propose a casing pressure valve, which solves the problem in the prior art that the sealing performance of the backwash valve is easily affected by impurities
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[0019] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0020] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood ...
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The invention relates to a casing pressure valve device with stable sealing property. The casing pressure valve device comprises a center pipe, wherein a spring sleeves the center pipe; the exterior of one end of the center pipe is screwed with an upper joint; the outer side of the upper joint is screwed with an adjusting ring; the exterior of the center pipe is screwed with a piston; a valve seat sleeves the piston; the interior of the valve seat is provided with a step type cavity; the step side of the step type cavity is glidingly connected with the piston in a sealing way, and the other side of the step type cavity is glidingly connected with the center pipe; the interior of the step type cavity is provided with a space for the piston to slide; a protecting sleeve sleeves one end, away from the piston, of the valve seat, and is fixedly connected with the valve seat; a lower joint sleeves the part, near the protecting sleeve, of the center pipe, and is connected with the center pipe by threads; the valve seat and the lower joint are sealed by a sealing gasket; a second liquid passing hole is formed in the part, near the lower joint, of the center pipe in a radial direction, and is covered by a cover of the valve seat; the spring is positioned between the adjusting ring and the valve seat. The casing pressure valve device has the advantages that the opening pressure can be adjusted by the adjusting ring; the sealing property can be improved by using the adjusting ring to adjust the pretightening force on the valve seat, and the problem of influence on the sealing property of a backwash valve because of impurities is solved.
Description
technical field [0001] The invention belongs to the technical field of oil field downhole tools, and relates to a casing pressure valve device. Background technique [0002] At present, it is often necessary to run down some process strings during downhole operations, and to establish backwash circulation channels at any time during the operation process as required by the process. The tools often used to establish backwash circulation channels are backwash circulation valves or casing pressure valves. . The commonly used backwash valve (such as: CN 202900106 U) composed of ball and seat has the following problems: 1. During the positive pressure process, the sealing performance of the ball and seat is easily affected by the impurities in the medium; 2. The backwash The opening pressure value cannot be adjusted; 3. The backwash liquid channel is relatively small. Therefore, a casing pressure valve with stable sealing and adjustable backwash pressure value is needed on site...
Claims
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IPC IPC(8): E21B21/10
CPCE21B21/10
Inventor 李志广郭建勋闫永维单桂栋李风涛李川张子佳
Owner DRILLING TECH DEV CO LTD OF TIANJIN DAGANG OILFIELD PETROLEUM ENG INST