Deep coal seam fluidized coal and coal bed gas co-mining and CO2 storage and collection integrated method

Abstract

The invention provides a deep coal seam fluidized coal and coal bed gas co-mining and CO2 storage integrated method. The method comprises the steps of multi-branch horizontal well building, water jet flow cavity building and coal and coal bed gas co-mining, coal bed drainage pressure relief and coal bed gas mining, and CO2 injection and storage. According to the method, a ground development mode is adopted, based on a water jet technology, cavity building and pressure relief are carried out, coal and coal bed gas are jointly mined, coal bed cavities which are provided with certain coal pillar supports and are communicated with each other are formed underground, after coal and coal bed gas mining is basically completed, then mining is converted into injection, CO2 injection and storage are carried out, and the coal and coal bed gas are fully exploited. Safe and efficient development of deep coal and coal bed gas resources and CO2 storage integrated operation can be achieved, and a deep coal bed is built into a CO2 underground gas storage capable of achieving cyclic injection and output.

Description

technical field [0001] The invention is applied to the technical field of coalbed methane exploitation and carbon dioxide sequestration, in particular to a co-mining of deep coalbed fluidized coal and coalbed methane and CO 2 Reservoir integration method. Background technique [0002] Coalbed methane is an important part of China's unconventional natural gas resources. It is estimated that the total amount of coalbed methane resources shallower than 2000m in my country is about 82 trillion cubic meters, and the recoverable resources amount to 10 trillion cubic meters. At present, there are two modes of coalbed methane mining: First, in the process of coal mining, gas (coalbed methane), which is a safety risk factor for production activities, is carried out through underground mining, mining in mining areas, and mining in abandoned mines. Extraction and utilization, these measures need to be formulated and implemented according to site conditions to ensure the safety of mini...

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Problems solved by technology

However, for coal seams in my country, especially in the southwest region, the thickness of the coal seam is relatively thin and the structure of the coal body is broken. It is difficult to drill horizontal wells directly in the coal seam, and the economic benefits of CBM development are not high.

while relying on CO 2 To replace coalbed methane for coalbed methane development and carbon dioxide sequestration, the theory and technology are still immature, and the underground replacement reaction time is relatively long.

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