煤层气井间干扰主控因素数值模拟  

Numerical Simulation on Main Controlling Factors of Coalbed Methane Well Interference

作　　者：王乔[1,2] 吴财芳[1,2] 李腾[1,2] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221008 [2]煤层气资源与成藏过程教育部重点实验室,江苏徐州221008

出　　处：《煤矿安全》2014年第6期1-4,共4页Safety in Coal Mines

基　　金：国家科技重大专项资助项目(2011ZX05034);青蓝工程资助项目;国家自然科学基金面上资助项目(41272178)

摘　　要：以潘庄西区3#煤层为研究对象,结合煤层气井排采资料及实验室测试资料,利用COMET3专用软件,建立了多井地质模型,设计了井间干扰模拟方案,探讨了多井开采过程中井间干扰的主要控制因素。结果表明:井间干扰大大加速了储层压力的降低,使得煤层甲烷大量解吸,有效解吸区面积增大,产气速度加快,煤层气总产气量也随之增大。井间距、渗透率、孔隙度是井间干扰的主控因素。井距越小,井间干扰越早发生,干扰越强烈;渗透率越大,储层渗流条件越好,排水降压速率越快,井间干扰越强;孔隙度在井组排采前期对井间干扰有较强影响,排采后期干扰程度降低。吸附常数对井间干扰影响不大。In this paper, the No. 3 coal seam in west area of Panzhuang block was considered as the research object, by using the soft- ware COMET3 and combined with the drainage data of CBM well and laboratory test data, the multi -well geologic model was estab- lished, and the simulation scheme of well interference was designed, then the main controlling factors of well interference during the multi - well exploration had been discussed. Numerical simulation results showed that well interference greatly accelerated the reduction of reservoir pressure, which made the coalbed methane desorb largely. As a result, the effective desorption area increased, the speed of gas production was accelerated and the total gas production was increased too. Well spacing, permeability and porosity were the main controlling factors of well interference. The smaller the well spacing was, the earlier the well interference occurred, and the stronger the degree of the well interference was. The bigger the permeability was, the better the percolation condition of the reservoir was, the faster the rate of drainage and pressure lowering was and the stronger the degree of the interference was. Porosity had a strong influence on well interference in the earlier stage of well group mining, while it weakened in the later stage. Adsorption constant had little influence on well interference.

关 键 词：煤层气井 压降漏斗 井间干扰 数值模拟 控制因素 

分 类 号：TD712[矿业工程—矿井通风与安全]