煤层气注热增产研究进展  

Thermal injection stimulation to enhance coalbed methane recovery

作　　者：杨兆中[1] 袁健峰 朱静怡[1,2] 李小刚 李扬[3] 王浩 YANG Zhaozhong;YUAN Jianfeng;ZHU Jingyi;LI Xiaogang;LI Yang;WANG Hao(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China;China ZhenHua Oil Co.,Ltd.,Beijing 100031,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]西南石油大学化学化工学院,四川成都610500 [3]振华石油控股有限公司,北京100031

出　　处：《油气藏评价与开发》2022年第4期617-625,632,共10页Petroleum Reservoir Evaluation and Development

基　　金：中国博士后科学基金项目“微波加热下稠油降黏改质机理及其电磁热流固耦合效应研究”(2020M683361)。

摘　　要：注热增产技术是除水力压裂外另一种有效的煤层气增产方法,适用于含水率低和降压解吸困难的煤层。通过国内外文献调研,阐述了煤层气注热的增产机理,分析了注热升温对煤层吸附/解吸和渗透率的影响,总结了热采煤层气过程中的热—流—固耦合关系,介绍了注热蒸汽法、注热CO_(2)法、微波注热法以及火烧煤层法4种注热增产的方法,综述了4种方法的技术原理、技术特点以及目前国内外的研究进展。研究表明注热方法可促进煤层气的解吸,提高游离态煤层气含量,达到煤层气增产的目的。同时注热导致的热致裂和煤热解可以改善煤层孔隙结构,沟通和增大煤层裂缝网络,有利于煤层气的扩散和渗流。煤层气的注热增产技术能有效解决煤层气含水率低、降压解吸困难、强水敏等问题,是可替代水力压裂的另一种极具潜力的增产方法。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 thermalhydraulic-mechanical coupling relationship in the process of thermal coalbed methane production are summarized.Then,four methods,which are thermal steam injection,thermal CO_(2) 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.

关 键 词：煤层气 注热增产 吸附/解吸 渗透率 水力压裂 

分 类 号：TE37[石油与天然气工程—油气田开发工程]