煤层气开发井网优化设计

Optimization design of CBM well grid pattern

煤层气田井网布置的好坏直接影响到煤层气开发的成败以及最终采收率的高低。通过数值模拟方法,给出了煤层气井网优化设计的原则以及井网优化设计考虑的因素,如井间干扰、各向异性、井距与排距之比、井网密度、井网方位等,并利用数值模拟软件对鄂尔多斯盆地某区块进行了开发井网的优化设计,为该区的煤层气开发方案设计提供了合理依据。

The exploitation of CBM is different from conventional gas.The water in coal needs to be drained in CBM wells before the gas come out,so well grid pattern is usually used in CBM exploitation in order to get better effect of water drainage and depressurization,the arrangement of well pattern directly affects the success of CBM development and the level of ultimate recovery.This paper presents the optimization design principle of CBM well pattern and factors such as well interference,anisotropy,well spacing,well density and direction,then conducts optimization design of CBM well pattern aiming at an area in Ordos basin by numerical simulation software,thus providing reasonable basis for development program design of the area.