Petroleum Reservoir Evaluation and Development >
2022 , Vol. 12 >Issue 4: 617 - 625
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2022.04.009
Thermal injection stimulation to enhance coalbed methane recovery
Received date: 2022-04-14
Online published: 2022-09-02
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.
Zhaozhong YANG , Jianfeng YUAN , Jingyi ZHU , Xiaogang LI , Yang LI , Hao WANG . Thermal injection stimulation to enhance coalbed methane recovery[J]. Petroleum Reservoir Evaluation and Development, 2022 , 12(4) : 617 -625 . DOI: 10.13809/j.cnki.cn32-1825/te.2022.04.009
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