System of increasing yield of coal seam gas by mixing with hot air proppant, and its working method

Abstract

The invention discloses a system of increasing yield of coal seam gas by mixing with a hot air proppant. The system comprises a high temperature and high pressure hot air generating device, a proppantstorage tank, a proppant delivery pump and a multi-stage mixing device, wherein the air outlet end of the high temperature and high pressure hot air generating device is connected to the air inlet end of the multi-stage mixing device, the discharge end of the proppant storage tank is connected to the feed end of the proppant delivery pump, the discharge end of the proppant delivery pump is connected to the feed end of the multi-stage mixing device, and the mixture discharge end of the multi-stage mixing device is connected to the upper end of a coal seam well opened in a low-coal rank reservoir. The system provided by the invention mixes the hot air with high temperature and high pressure and proppant uniformly three times and then injects the mixture into the coal seam well in the low-coal rank reservoir to heat the coal seam to generate a large number of artificial cracks, which can increase the resolution rate of coal seam gas. At the same time, the filling of the proppant into cracks can prevent the cracks from being closed due to stress release and increase the production of coal seam gas.

Description

technical field [0001] The invention relates to the technical field of coal bed methane exploitation, in particular to a system and a working method for increasing the production rate of coal bed methane by mixing hot air proppant. Background technique [0002] Coalbed methane is an unconventional natural gas associated with coal. Its main component is methane. It is an important clean energy source and a high-quality chemical raw material. Low-rank coalbed methane is the main target of coalbed methane development in the world. At present, the world has successfully realized large-scale coalbed methane Only the United States, Canada, Australia and China are the countries that develop and utilize them. Most of the coalbed methane production in the United States, Canada, and Australia comes from low-rank coalbed methane, while most of my country's coalbed methane production comes from the Qinshui Basin in Shanxi and the east of the Ordos Basin. Medium and high rank coalbed metha...

AI Technical Summary

Problems solved by technology

However, the traditional method of heating coal reservoirs by electricity and high-temperature superheated steam heating coal reservoirs consumes a lot of resources, costs are high, and the reasons for low economic efficiency are difficult to achieve industrialization and large-scale implementation and application.

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