煤层气排采过程中储层压降动态变化影响因素  

Dynamic varied influence factors of pressure drop in coal reservoir during coalbed methane drainage process

作　　者：李瑞[1] 王生维[1,2] 吕帅锋 肖宇航[1] 粟冬梅[1] 吴川[3] 

机构地区：[1]中国地质大学(武汉)资源学院,湖北武汉430074 [2]山西晋城无烟煤矿业集团有限责任公司国家能源煤与煤层气共采技术重点实验室,山西晋城048006 [3]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《煤炭科学技术》2017年第7期93-99,共7页Coal Science and Technology

基　　金：国家科技重大专项资助项目(2016ZX05067-001);山西省煤基重点科技攻关资助项目(MQ2014-06);山西省煤层气联合研究基金资助项目(2014012011)

摘　　要：为了进一步认识煤层气排采过程中储层压降传递规律及其对煤层气排采的影响,在煤储层裂缝系统发育与分布特征观察研究的基础上,分别建立了煤裂缝系统及煤基质内压降传递地质模型,并分析总结了储层压降传递影响因素及其相互关系。结果表明:煤储层压降传递及动态变化主要受储层渗透率、含水性、含气饱和度、煤解吸/吸附特性以及井底流压影响,其中储层大裂缝系统内的压降传递主要与渗透率、含水性以及井底流压相关;而煤基质内的压降传递则主要与含气饱和度及煤解吸/吸附特征相关。鉴于储层压降传递及其影响因素在煤层气排采中的作用,提出煤层气排采前应首先掌握影响储层压降的地质参数特征;排采过程中井底流压的控制应充分考虑影响储层压降的各因素之间的联系。In order to further understand a pressure drop transfer law of the coal reservoir during the coalbed methane drainage process and pressure drop transfer law affected to coalbed methane drainage,based on an observation study on the development and distribution features of the cracking system in the coal reservoir,a coal cracking system and coal matrix pressure drop transfer geological model were established individually and the pressure drop transfer influence factors and the relationship of the coal reservoir were analyzed and summarized. The result showed that pressure drop transfer and dynamic variation of the coal reservoir were affected mainly by the reservoir permeability,water-bearing ability,gas saturation,coal desorption/adsorption features and the well bottom flow pressure and among them,the pressure drop transfer within the large cracking system of the reservoir would be mainly related to the permeability,water-bearing ability and the well bottom flow pressure. Within the coal matrix,the pressure transfer would be mainly related to the gas saturation and the coal desorption/adsorption features. Due to the reservoir pressure drop transfer and the influence factors plaid the role in the coalbed methane drainage,the geological parameter features affected to the pressure drop of the reservoir should be understood before the operation of the coalbed methane drainage. The well bottom flow pressure control in the gas drainage process should fully consider the relationship between the pressure drop influence factors of the reservoir.

关 键 词：煤层气 储层压降 井底流压 排采优化 

分 类 号：P618.11[天文地球—矿床学]