Device and method capable of heating coal reservoir to improve low-coal-rank coal bed gas yield

Abstract

The invention discloses a device capable of heating a coal reservoir to improve a low-coal-rank coal bed gas yield. The device comprises a truck, a flowmeter, a first gas booster, a second gas booster, a mixed gas separating device, a methane storage tank, a water collecting box and a control system. A U well and multiple exploited wells are drilled in the coal reservoir on the ground, the U wellis composed of a first vertical well segment, a horizontal well segment and a second vertical well segment, a fuel battery air heat exchange system is mounted on the truck, a gas outlet of the fuel battery air heat exchange system is connected with a gas inlet of the first gas booster, a gas outlet of the first gas booster is connected with a well opening of the first vertical well segment, a wellopening of the second vertical well segment is connected with a gas inlet of the second gas booster, a gas outlet of the second gas booster is connected with a gas inlet of the mixed gas separating device, and the exploited wells are connected with an extraction device. Water in a low-coal-rank reservoir is effectively removed, desorption of methane molecules is promoted, and the low-coal-rank coal bed gas yield is improved.

Description

technical field [0001] The invention relates to the technical field of coalbed methane exploitation, in particular to a device and method for heating coal reservoirs to increase the production rate of low coal rank coalbed methane. Background technique [0002] With the progress of coalbed methane exploration and development, low coal rank coalbed methane has attracted widespread attention at home and abroad because of its abundant resources. However, the development effect of low-rank coalbed methane in my country is not satisfactory, mainly because the degree of coalification of low-rank coal is low, and the cleat system is not developed, resulting in extremely low reservoir permeability. Especially in lignite reservoirs, the permeability is often less than 0.1mD, resulting in extremely low production of coalbed methane. At present, there are still no effective measures to improve the permeability of low coal rank reservoirs. [0003] In order to solve the above existing...

AI Technical Summary

Problems solved by technology

However, the development effect of low-rank coalbed methane in my country is not satisfactory, mainly because the degree of coalification of low-rank coal is low, and the cleat system is not developed, resulting in extremely low reservoir permeability.

Especially in lignite reservoirs, the permeability is often less than 0.1mD, resulting in extremely low production of coalbed methane

At present, there are still no effective measures to improve the permeability of low-rank coal reservoirs

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