煤层气注热增产研究进展

doi:10.13809/j.cnki.cn32-1825/te.2022.04.009

Abstract

Abstract:

Thermal injection stimulation technology, which is suitable for coal seams with low water content and difficult pressure reduction and desorption, is an effective method to increase coalbed methane production besides hydraulic fracturing. Based on the literature research at home and abroad, the stimulation mechanism of coalbed methane heat injection is expounded, the influences of heat injection and temperature rise on adsorption and desorption and permeability of coal seam are analyzed, and the thermal-hydraulic-mechanical coupling relationship in the process of thermal coalbed methane production are summarized. Then, four methods, which are thermal steam injection, thermal CO₂ injection, microwave thermal injection and coal seam burning, are introduced, and their technical principles, characteristics and research progress at home and abroad are summarized. The study shows that the method of heat injection can promote the desorption of coalbed methane, increase the content of free coalbed methane and achieve the purpose of increasing the coalbed methane production. Meanwhile, thermal cracking and coal pyrolysis caused by heat injection can improve the pore structure of coal seam, and communicate and increase the fracture network of coal seam, which are beneficial to the diffusion and seepage of coalbed methane. The thermal injection stimulation technology of coalbed methane can effectively solve the problems of low water content, difficult depressurization and desorption, and strong water sensitivity of coalbed methane, which is another potential stimulation method to replace hydraulic fracturing.

Key words: coalbed methane, thermal stimulation, adsorption desorption, permeability, hydraulic fracturing

CLC Number:

TE37

YANG Zhaozhong,YUAN Jianfeng,ZHU Jingyi,LI Xiaogang,LI Yang,WANG Hao. Thermal injection stimulation to enhance coalbed methane recovery[J].Petroleum Reservoir Evaluation and Development, 2022, 12(4): 617-625.

Figures/Tables 8

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升温对渗透率的影响规律	文献来源
渗透率随温度升高逐渐增大	任常在等^[16];LI等^[17];JIANG等^[18]
渗透率随温度升高先减小再增大	李波波等^[19]
高有效应力时,渗透率与温度成负相关	巩天白^[20];GAO等^[21]
渗透率随温度升高先降低后升高再降低	LI等^[22]

Thermal injection stimulation to enhance coalbed methane recovery

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