Carbon dioxide cyclic injection system of coal-bed gas well

Abstract

A carbon dioxide cyclic injection system of a coal-bed gas well comprises an intelligent oil extraction part (27), a gas separation part (28), a carbon dioxide compression dehydration condensation part (29) and a carbon dioxide cyclic injection power part (30) which are connected successively. The carbon dioxide cyclic injection system aims to improve coal reservoirs, increase the flow conductivity of the coal reservoirs, and extract much methane gas in the coal reservoirs through cyclic gas injection, so that the output speed of the methane gas in the coal reservoirs is increased, the recovery period of the coal-bed gas well is shortened, and the recovery efficiency and the economic benefit of the coal-bed gas well are improved. According to the carbon dioxide cyclic injection system, by aid of the cyclic gas injection, partial carbon dioxide can be sealed, the discharge of the carbon dioxide gas in the air is reduced, and the greenhouse effect is decreased.

Description

technical field [0001] The invention belongs to the technical field of energy saving and environmental protection in coal mine production, in particular to a carbon dioxide injection system for coal bed gas well circulation. Background technique [0002] Coalbed methane is a gas mainly composed of methane that occurs in coal seams. As an efficient and clean energy, coalbed methane has attracted more and more attention in recent years. In order to extract the coalbed methane stored in the coal seam, the higher coal seam fracture channel is one of the important conditions for its effective extraction. The size of the permeability is an important indicator of the degree of fracture development. Because coal reservoirs in my country are generally low-permeability reservoirs, how to change the conductivity of coal reservoirs is one of the keys to improving the recovery of coalbed methane. [0003] At present, there are mainly two methods for improving the conductivity of coal ...

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Problems solved by technology

At present, carbon dioxide injection can be realized on the ground to enhance oil recovery, but the current carbon dioxide injection equipment is relatively large. After the carbon dioxide is injected, with the drainage and pressure reduction, part of the carbon dioxide will be desorbed from the coal seam. How to develop A simple and easy-to-operate equipment that can recycle carbon dioxide injection, and at the same time collect the desorbed methane gas and carbon dioxide gas after injection, and reuse the carbon dioxide for the purpose of saving the cost of carbon dioxide injection and improving the recovery of methane rate has important practical significance

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