Coal seam super-critical carbon dioxide plugging device and method

Abstract

The invention discloses a coal seam super-critical carbon dioxide plugging device and method. The device comprises a front-end hole packer, a rear-end hole packer, a grouting pipe, a super-critical carbon dioxide injection pipe and a temperature controller; the front-end hole packer is composed of a front-end hole packer metal end head, a front-end hole packer heating device, a front-end hole packer capsule and a front-end hole packer water injection pipe; the rear-end hole packer is composed of a rear-end hole packer capsule and a rear-end hole packer water injection pipe; the front-end hole packer and the rear-end hole packer are connected with the super-critical carbon dioxide injection pipe through quick sealing connectors, and the super-critical carbon dioxide injection pipe is connected with a super-critical carbon dioxide air source; the grouting pipe is arranged between the front-end hole packer capsule and the rear-end hole packer capsule; and the water injection pipe is connected with a high-pressure water source. The plugging method is high in reliability and good in plugging effect; and efficient plugging of super-critical carbon dioxide in a coal seam is achieved, it is ensured that the carbon dioxide injected into a drill hole is in a super-critical state, and application and promotion of the super-critical carbon dioxide in coal-seam gas yield increasing are facilitated.

Description

technical field [0001] The invention relates to a coal seam supercritical carbon dioxide plugging device and method, and belongs to the technical field of efficient mining of coal seam gas. Background technique [0002] Coal bed methane is a kind of unconventional natural gas, and it is also the "first killer" in the process of coal development. The development and utilization of coalbed methane is an important part of the country's "clean, efficient, safe and sustainable" modern energy system. However, the geological conditions of coal seams in my country are very complex. The microporosity, low permeability and high adsorption characteristics of most coal seams make it difficult to extract coal bed methane, resulting in low utilization efficiency of coal bed methane resources. In recent years, with the continuous increase of mining depth, the high geostress and high gas gradient in deep coal seams further increase the frequency and intensity of gas disasters. Efficient e...

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Problems solved by technology

However, it is difficult to maintain the supercritical state of gas, and there is a lack of effective plugging devices and methods in the field of coal mines. Therefore, the development of supercritical

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