Coal dust removal method in coalbed methane exploitation pipeline

Abstract

The method for removing pulverized coal in the coalbed methane mining pipeline includes the following steps: 1. Put the pipeline robot into the coalbed methane mining pipeline, start the walking mechanism to move forward along the inner wall of the pipeline; 2. While the pipeline robot is advancing on the inner wall of the pipeline, Control the pipeline robot to perform rotating cleaning operations to remove the coal powder attached to the inner wall of the pipeline; 3. Control the pipeline robot to collect and store the cleaned coal powder; 4. Compress the stored coal powder and squeeze out the water; 5. When the pulverized coal storage is full, turn off the rotary cleaning, pulverized coal collection and compression operations of the pipeline robot, and control the walking mechanism of the pipeline robot to move in reverse and exit from the pipeline. The present invention does not affect the normal exploitation of the coalbed methane when cleaning the pulverized coal, stores the pulverized coal after the blockage of the inner wall of the pipeline is cleared, and has the advantages of convenient operation, high degree of automation and strong reliability.

Description

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

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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