煤层气注热增产研究进展

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

摘要/Abstract

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CO₂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。

关键词: 煤层气, 注热增产, 吸附/解吸, 渗透率, 水力压裂

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

中图分类号:

TE37

杨兆中,袁健峰,朱静怡,李小刚,李扬,王浩. 煤层气注热增产研究进展[J]. 油气藏评价与开发, 2022, 12(4): 617-625.

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.

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