摘要
为获取气固耦合作用下煤层气注热开采过程热量分布规律,探究煤层内气-固体系吸热量的影响因素,采用自行研制的三轴煤层气解吸热量测试验装置,在实验室中对柱状原煤进行了不同轴、围压条件下煤体甲烷解吸过程温度及热量变化测定,利用温度补偿原理获取了解吸热与解吸量关系理论模型,利用COMSOL Multiphysics软件进行了煤层气注热开采过程热量迁移规律数值模拟。结果表明:解吸热随解吸量呈指数增长趋势;模拟结果显示井间距为60 m时相较于40 m时煤层吸热量更快达到稳定,吸附气体吸热量升高持续时间为井间距40 m时的1.9倍;解吸热量在注热温度为593 K时较注热温度为493 K时增加15.97%,且达到最终解吸热量稳定时间减少21.4%。对比分析得到,在单井注热开采条件下,增大井间距和提高注热温度均可以不同程度影响热量在煤层中迁移、增大解吸热量并促进解吸作用,进而大幅度提升煤层气井筒累计产量。研究结果可为低渗透储层煤层气高效安全开采及煤层气注热开采工艺方案优化提供理论支撑。
The paper intends to present an experiment set of the desorptive thermos under the condition of the tri-axial stress designed and the experiment on the development of temperature and thermos transfer quantity in the process of methane desorption under the different axes and confining pressure conditions with the columnar raw coal. To trace and disclose the thermal migration regularity of the coal-bed methane( CBM) in the process of heat injection exploitation,it would be necessary to examine the influential factors on the thermal absorption of the coal-methane system under the action of the gas-solid coupling. To achieve the purpose,it is also necessary to stimulate the thermal migration regularity in the process of thermal injection via an experimental relation between the desorption heat and desorptive flow through the temperature compensation principle with the software known as the COMSOL Multiphysics. And,then,the experimental results we have gained tend to suggest that the desorption thermos of CBM tends to exhibit an exponential trend with the desorption flow. And,so,the simulation results should prove that,when the well interval space between the injection well and the mining well is 60 m,but the thermal absorption of the coal goaf grows faster with the duration increase of the thermal absorption of the adsorbed gas being 1. 9 times as compared with the 40 m. But,in the condition when the desorptive heat has increased by15. 97% and the heat injection temperature comes to 593 K as compared with the heat injection temperature of 493 K,the final desorption of the stabilization period of the thermos may decrease by 21. 4%. And,in such a case,the comparison results can thus demonstrate that the well spacing increase and the change of the thermos injection temperature can both affect the thermal migration in the coal reservoir and increase the desorption thermos so as to promote the desorption of CBM at the different levels.Besides,a significant increase can also be found in the cumulative yield of the CBM even
作者
杨新乐
巩天白
苏畅
李惟慷
张永利
姜涛
刘杰
YANG Xin-le;GONG Tian-bai;SU Chang;LI Wei-kang;ZHANG Yong-li;JIANG Tao;LIU Jie(School of Mechanical Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2021年第4期1551-1558,共8页
Journal of Safety and Environment
基金
国家自然科学基金项目(51574136,51104083,51574138)
辽宁省“兴辽英才计划”项目(XLYC1807150)。
关键词
安全工程
煤层气
解吸热
注热开采
热量迁移
井间距
safety engineering
CBM
desorption heat
heat injection exploitation
thermal migration
well spacing
