Method for designing well wall of coal-bed gas well

Abstract

The invention belongs to the technical field of coal-bed gas development, and particularly relates to a coal-bed gas well wall design method. According to the method, a coal seam crack formed by fracturing of a coal-bed gas well is filled with consolidation proppants, the consolidation proppants can be mutually adhered and consolidated in the coal seam crack to form a supporting strip, so that the consolidation proppants are prevented from being embedded into a coal seam, the coal seam crack is prevented from being closed and collapsed, and the method has the advantages that firstly, the desorption area of the coal seam is increased; desorption gas is greatly increased, so that the gas production rate of a single well is improved; and secondly, the coal seam crack becomes a stable seepage channel with high flow conductivity, so that the permeability and the stability of the coal seam are enhanced, and the high yield and the stable yield of the coal-bed gas well are further realized.

Description

technical field [0001] The application belongs to the technical field of coalbed methane development, and in particular relates to a method for designing a wellbore of a coalbed methane well. Background technique [0002] my country is rich in coalbed methane resources, but the single-well production of coalbed methane is low, and the production volume of coalbed methane is far below the expected target, and technological problems are one of the important factors restricting the actual production capacity of coalbed methane. Coalbed methane is usually produced through three links of desorption, diffusion and seepage. Restricting any of these links may lead to low production and low efficiency in coalbed methane wells. [0003] In the currently commonly used fracturing technology for coalbed methane wells, conventional proppants are often used to support coal seam fractures, but conventional proppants are easily embedded in the coal seam with the outflow of formation fluid, w...

AI Technical Summary

Problems solved by technology

Coalbed methane usually needs to be produced through desorption, diffusion and seepage. Restricting any one of these links may lead to low production and low efficiency of coalbed methane wells

[0003] In the current commonly used coalbed methane well fracturing technology, conventional proppants are often used to prop up coal seam fractures, but conventional proppants are easily embedded into coal seams with the outflow of formation fluids, causing coal seam fractures to close, and coalbed methane well walls (Coal seam cracks) The coal and rock debris generated by it is easy to peel off into the gaps between conventional proppants, block the coal seam cracks, greatly reduce the desorption area and seepage capacity of coal seam cracks, and seriously restrict the desorption and seepage in the process of coalbed methane recovery link, leading to low output of CBM single well

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