Water drainage and gas production intensity determination method capable of improving water drainage and gas production efficiency of coal bed gas

Abstract

The invention discloses a water drainage and gas production intensity determination method capable of improving the water drainage and gas production efficiency of the coal bed gas. The method adaptsto real-time dynamic changes of reservoirs and actual production performance of coal bed gas wells, can effectively avoid serious reservoir damages caused by unreasonable water drainage and gas production intensity design in an early-stage water drainage and gas production scheme, and is especially applicable to new development areas with limited basic data or deficient water drainage and gas production experience. The method has strong pertinency and universality, is simple to operate and easy to understand, can effectively guide field operators to conduct dynamic analysis on water drainage and gas production and conduct production management on water drainage and gas production, greatly reduces the fault rate of water drainage and gas production and the production management cost, prolongs the operation cycle and improves the gas production amount of the single well.

Description

technical field [0001] The invention belongs to the technical field of coal bed gas exploitation, and in particular relates to a method for determining the extraction intensity of the coal bed gas which can improve the extraction efficiency of the coal bed gas. Background technique [0002] Coalbed methane, commonly known as gas, is a kind of hydrocarbon gas stored in coal seams with methane as the basic component. It is an associated mineral resource of coal and belongs to unconventional natural gas. my country is rich in coalbed methane resources, and the amount of coalbed methane resources ranks third in the world. The exploration and development of coalbed methane is in line with the policy orientation of the country to vigorously develop clean energy and green environmental protection industries. If coalbed methane can be efficiently developed, it can effectively narrow the gap between national energy supply and demand. It is conducive to improving the energy supply stru...

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Problems solved by technology

The geological conditions for the storage of coalbed methane resources in my country are relatively complex, the storage and adsorption conditions of coalbed methane are quite different, and the distribution is not uniform. , pore structure, permeability, gas content, adsorption / desorption characteristics and other data are poorly representative, the design of drainage scheme is difficult, and the site adaptability is poor. Due to the unreasonable control of production pressure difference and drainage intensity, frequent drainage technical errors , leading to the obstruction of pressure drop propagation, low efficiency of drainage and gas recovery, seriously affecting gas production, and greatly increasing the development cost of coalbed methane wells

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