Drainage and gas production integrated goaf gas extraction well body structure and construction method thereof

Abstract

The invention belongs to the technical field of coal mine goaf gas ground extraction, specifically relates to a drainage and gas production integrated goaf gas extraction well body structure and a construction method thereof, and solves the technical problems of simultaneously draining goaf accumulated water and extracting goaf gas. The drainage and gas production integrated goaf gas extraction well body structure comprises a well depth structure portion and an equipment portion, wherein the well depth structure portion comprises a first spud sleeving pipe disposed at the uppermost layer, the bottom of the first spud sleeving pipe is connected with a second spud sleeving pipe disposed at the aquifer depth position, the bottom of the second spud sleeving pipe is connected with a third spud screen pipe disposed at the goaf and fissure zone depth position, and the bottom of the third spud screen pipe is disposed at the well bottom position; and the equipment portion comprises an oil pipe disposed in the first spud sleeving pipe, the second spud sleeving pipe and the third spud screen pipe, the top of the oil pipe is provided with a water outlet, a lower portion of the oil pipe is provided with a drainage pump, the bottom of the oil pipe is provided with a water suction port, the top of the first spud sleeving pipe is a well head, an oil pipe suspending and sealing device is disposed at the well head position, and a gas extraction pump is communicated with the well head. Functions of draining goaf accumulated water and extracting goaf gas through one well can be fulfilled.

Description

technical field [0001] The invention belongs to the technical field of ground gas drainage in goafs of coal mines, and in particular relates to a well body structure and a construction method for gas drainage wells in goafs integrated with drainage and gas extraction. Background technique [0002] The main component of coal mine gas is CH 4 (methane), which is a clean and efficient energy source associated with coal. In the goaf formed after coal mining, there is still a large amount of gas, which can be used for continuous extraction. Due to CH 4 The density of (methane) is lower than that of air, and it usually accumulates preferentially in the roof fissure zone and the upper part of the goaf. Compared with underground drainage, the extraction by ground drilling has the advantages of high extraction concentration, simple use, and low cost. It is a An emerging field with broad development prospects. The United Kingdom, Germany, and the United States have formed related ...

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Problems solved by technology

[0004] In order to solve the technical problem of draining goaf accumulated water and draining goaf gas at the same time, the present invention provides a goaf gas drainage well body structure integrated with drainage and gas recovery

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