多场耦合煤层气开采物理模拟试验系统的研制和应用  

DEVELOPMENT AND APPLICATION OF MULTI-FIELD COUPLING TEST SYSTEM FOR COAL-BED METHANE(CBM) EXPLOITATION

作　　者：刘东[1,2] 许江[1] 尹光志[1] 王维忠[1] 彭守建[1] 梁永庆[1] 

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]河南能源化工集团研究院有限公司,河南郑州450046

出　　处：《岩石力学与工程学报》2014年第A02期3505-3514,共10页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家科技重大专项项目(2011ZX05034–004);国家重点基础研究发展计划(973)项目(2011CB201203);国家自然科学基金青年基金项目(51304255)

摘　　要：自主研制多场耦合煤层气开采物理模拟试验系统,其结构主要包括主体承载支架、试件箱体、伺服加载系统、单一管开采系统、侧向多管开采系统以及数据采集系统等。该系统可用于多物理场耦合时单一煤层和多煤层状态下煤层气开采的物理模拟试验,以及被保护层卸压抽采过程的物理模拟试验,且系统设计的数据采集系统可以对储层参数进行时空监测,以研究地应力场、渗流场、温度场的变化及其与储层煤层气流动的相关性。应用该系统进行煤层气开采物理模拟,试验结果表明:温度和气体压力有着明显的耦合作用,气体压力下降量越大温度的降低量也就越大;与开采管距离越近,气体压力变化的差异性越大,而且气体压力和温度降低越早,降低量也越大;气体压力差与气体流量有直接的相关性。结果表明该系统能够模拟煤层气开采过程,并能实时监测开采过程中的储层参数,为煤层气开采研究提供一种新的实验室物理模拟方法。Multi-field coupling test system for coal-bed methane（CBM） exploitation was developed independently,which mainly consists of bearing skeleton frame,specimen box,servo loading system,single tube system for methane exploitation,lateral multi-tube system for methane exploitation,and data acquisition system. The test system could be used for multi-field coupling simulation of CBM exploitation under single coal bed occurrence status and multi-coal bed occurrence status, and for multi-field coupling simulation of gas drainage in the distressed area of the protected seam. And multi-channel data acquisition system was used to collect reservoir parameter such as temperature,stress and gas pressure,in order to research their evolution and correlation with gas flow during CBM exploitation. The preliminary result of the CBM exploitation test indicates that ： there is obvious coupling effect between gas pressure and temperature,which finds expression in the greater temperature reduction with the greater gas pressure decrease;the difference of gas pressure drop in the section becomes more and more obvious as its distance to the exploitation tube decreases;the pressure and temperature nearby the tubeboth drop earlier and greater than that of the further location;and the gas pressure gradient is directly correlative with the gas flow. The research proved the test system s qualification and its real-time monitoring function for physical simulation of CBM exploitation. The test system provides a new methodology for research on CBM exploitation by physical simulation.

关 键 词：采矿工程 煤层气开采 多场耦合 物理模拟 研制 

分 类 号：TU45[建筑科学—岩土工程]