Simple wellhead plugging tool for coal bed gas well
A plugging tool and coalbed methane well technology, which is applied in wellbore/well components, sealing/isolation, earthwork drilling and production, etc., can solve the problems of reservoir damage, affecting the productivity of coalbed methane wells, and the failure of coalbed methane wells to restore normal gas production, etc.
Inactive Publication Date: 2020-03-17
PETROCHINA CO LTD +2
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Problems solved by technology
[0004] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the pressure relief of the coalbed methane well casing needs to release all the coalbed methane in the coalbed methane well, and the release time may take several days or even longer. Seriously affect the gas production recovery time of the CBM well and the gas production efficiency of the CBM well; after the well is killed, the high pressure under the CBM well will cause damage to the reservoir of the CBM well, making it impossible for the CBM well to restore normal gas production, and affecting the production efficiency of the CBM well. production capacity
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[0044] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0045] The simple wellhead plugging tool for a coalbed gas well provided by the invention includes a conveying component, a sealing joint and a sealing body. The conveying assembly includes an adjusting screw, a bearing seat and a guide rod. The bearing seat is provided with an adjusting nut and a bearing. The bearing is set on the adjusting nut, the adjusting nut is set on the adjusting screw, and the adjusting nut is configured to drive the adjusting screw when rotating. The lever moves axially, and the two ends of the guide rod are respectively connected with the adjusting screw and the sealing body; the guide rod passes through the sealing joint, and the sealing joint is suitable for connecting to the opening on the side of the coalbed methan...
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The invention relates to the technical field of coal bed gas development, and provides a simple wellhead plugging tool for a coal bed gas well. The plugging tool comprises a conveying assembly, a sealing joint (6) and a sealing body (7), wherein the conveying assembly comprises an adjusting lead screw (1), a bearing seat (3) and a guide rod (5), the bearing seat (3) is internally provided with anadjusting nut (31) and a bearing (32), the bearing (32) sleeves the adjusting nut (31), the adjusting nut (31) sleeves the adjusting lead screw (1), and the adjusting nut (31) is configured to drive the adjusting lead screw (1) to move axially during rotation; the two ends of the guide rod (5) are connected with the adjusting lead screw (1) and the sealing body (7) correspondingly; the guide rod (5) penetrates through the sealing joint (6), and the sealing joint (6) is suitable for being connected with a through opening (94) on one side of a coal bed gas wellhead (93); and the sealing body (7)is suitable for extending to two sides of the coal bed gas wellhead (93). The plugging tool can realize the replacement with pressure of a coal bed gas wellhead device.
Description
technical field [0001] The invention relates to the technical field of coalbed gas development, in particular to a simple wellhead plugging tool for coalbed gas wells. Background technique [0002] In the process of coalbed methane exploitation, the burial depth of coalbed methane wells is shallow, the reservoir pressure is low, and the casing pressure at the wellhead is low. Therefore, simple wellhead devices with low cost and low pressure are often used. The wellhead device has only one set of flange connections, and the upper flange of the flange connection is connected with a set of short tees. The upper end of the short tee is equipped with a polished rod sealer, and the horizontal end of the short tee is the liquid outlet. Since the wellhead device has been in the natural environment, during the long-term mining of coalbed methane by the coalbed methane well, the upper flange of the flanged connection of the wellhead device is easily damaged, which affects the efficie...
Claims
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IPC IPC(8): E21B33/03
CPCE21B33/03
Inventor 庞斌王炜彬熊先钺黄勇王海峰李国安
Owner PETROCHINA CO LTD