Coal powder removal method in coal seam gas exploitation pipeline

Abstract

The invention provides a coal powder removal method in a coal seam gas exploitation pipeline. The coal powder removal method includes the following steps that firstly, a pipeline robot is placed intothe coal seam gas exploitation pipeline and a walking mechanism is started to move forwards along the inner wall of the pipeline; secondly, while the pipeline robot moves along the inner wall of the pipeline, the pipeline robot is controlled to carry out the rotary removal operation, and the coal powder attached to the inner wall of the pipeline is removed; thirdly, the pipeline robot is controlled to collect and store the removed coal powder; fourthly, the stored coal powder is compressed and water is squeezed out; and fifthly, when the coal powder is full, the rotary removal, the coal powdercollection and compression operation of the pipeline robot is turned off, the walking mechanism of the pipeline robot is controlled to move backwards and the pipeline robot exits from the pipeline. According to the coal powder removal method, the normal exploitation work of coal seam gas cannot be affected when the coal powder removal operation is carried out. After the plugging of the inner wallof the pipeline is removed, the removed coal powder is stored, the operation is convenient, the automation degree is high, and the reliability is high.

Description

technical field [0001] The invention belongs to the technical field of coalbed methane exploitation, in particular to a method for removing pulverized coal in a coalbed methane exploitation pipeline. Background technique [0002] Hydraulic fracturing is currently the most commonly used and most effective technical means in CBM exploitation and CBM stimulation. The friction between the fracturing proppant and fracturing fluid system flowing through the surface of the coal seam and the coal will produce coal powder, and the coal powder will block the natural fracture system of the coal seam and the pores of the proppant-filled layer, which will affect the desorption and migration of the coalbed methane, resulting in the permeability of the coal seam. The permanent damage will seriously affect the gas production of coalbed methane wells. The mixing of pulverized coal will also increase the viscosity of the liquid, or block the crack tip, resulting in an increase in the constru...

AI Technical Summary

Problems solved by technology

[0004] The above measures all need to shut down the gas extraction function periodically to carry out the coal dust removal work, which affects the process and efficiency of gas extraction

The above measures can only be carried out outside the well, which consumes a lot of energy and cannot understand the detailed conditions in the well

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