Automatic reinjection water heating production increasing process of coal-bed gas well

Abstract

The invention relates to an automatic reinjection water heating production increasing process of a coal-bed gas well. The process comprises the following steps: A, performing precipitation and filtration treatment on produced liquid once or for more times to remove more than 95 percent of solid particles; B, heating the treated clear liquid through solar energy to increase the water temperature to 60-90 DEG C; C, injecting hot water into a shaft through a hot water reinjection pipeline, extending the hot water reinjection pipeline to the space below a coal bed through an oil sleeve annulus and increasing the temperature of the original shaft liquid to over 20 percent; D, circularly performing the steps. The process has the advantages that the heat energy is injected into the shaft liquid in a hot water injection mode and the brownian motion of coal dust in the shaft liquid is increased so as to increase the divergence of the coal dust in the water, favorably reduce the concentration of the coal dust and discharge the coal dust, besides a part of heat energy is transferred to a coal-bed gas storage layer of an immediate vicinity of a wellbore, so that the free energy of the coal-bed gas can be increased to increase the desorption rate of the coal-bed gas, and meanwhile the gas is expanded on heating, so that a seepage passage can be expanded, the permeability of a reservoir stratum is improved and the production increase of the coal-bed gas is realized.

Description

technical field [0001] The patent belongs to the technical field of production enhancement technology in the drainage and gas recovery process of coalbed methane wells, and in particular relates to an automatic heating and reinjection water stimulation technology for coalbed gas wells. Background technique [0002] Coalbed methane, commonly known as gas, is a gas resource that is associated and symbiotic with coal, and its main component is CH 4 . Coalbed methane is not only a clean fuel and chemical raw material, but also a strong greenhouse gas, and its greenhouse effect is that of CO 2 21 times that of coal mine safety accidents. The development and utilization of coalbed methane resources is of great significance for adjusting my country's energy structure, forming a new energy industry for coalbed methane, improving safety production conditions in coal mines, and reducing gas accidents and greenhouse gas emissions. [0003] At present, the single well production of c...

AI Technical Summary

Problems solved by technology

However, the hot huff and puff heat injection method is likely to cause a large amount of coal dust from the coal seam, which affects the drainage and production. It is difficult to control the combustion front of the coal seam and affect the coal mining in the later coal mine, so the application is limited.

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