Coal-bed gas well under-pressure operation device

Abstract

The invention belongs to well control equipment of gas wells and particularly to a well control device for a coal-bed gas well and a mobile operation device with the same. The well control device is characterized by comprising a wellhead blowout preventer which is in pipeline connection with the coal-bed gas well; the wellhead blowout preventer is connected with a lower universal slip which is connected with a lower universal blowout preventer; the lower universal blowout preventer is connected with a coupling detector; a pressure bearing device is connected above the coupling detector; an upper universal slip is connected above the pressure bearing device; an upper universal blowout preventer is connected above the upper universal slip. The well control device is suitable for the coal-bed gas well, the sealing effect is good, meanwhile the gas which can be leaked can be stored due to the pressure bearing device, and accordingly the defects of the existing oil gas well control equipment are effectively overcome.

Description

technical field [0001] The invention belongs to well control equipment for gas wells, in particular to a well control device for coalbed gas wells and mobile operating equipment with the well control device. Background technique [0002] As we all know, the domestic equipment and technology for applying snubbing operation on oil-water wells and natural gas wells are relatively mature. However, there is currently no relevant equipment and technology for snubbing operations in coalbed methane wells in China. The domestic equipment and technology for working with pressure have not solved the problems of working with sucker rods, low-pressure stabilizing operations, and integrated rapid operations. [0003] At present, the workover equipment with conventional opening and no pressure, due to the long time no pressure workover operation, the capillary channel of the gas-producing layer after desorption has been restored to the blocked state, and in the powdery Under the action o...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention designs a well control device suitable for coalbed methane wells. The present invention has a good sealing effect, and the pressure bearing device provided at the same time can maintain the casing pressure, which effectively solves the problem of existing The defect of the well control equipment of the oil and gas well, and the invention also designs a kind of mobile operation equipment of the coal bed gas well, realizes the mobile operation, overcomes the problem that the equipment in the prior art is bulky and inconvenient to carry

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