樊庄区块南部老井产量下降原因分析与现场治理对策研究

Cause Analysis and Field Treatment Countermeasures of Production Decline of Old Wells in South Fanzhuang Block

樊庄南部区块位于沁水盆地南部,于2006年投入开发,近十年的煤层气开发实践表明,递减是单井、气田开发的客观生产规律,递减期占单井生命周期的70%以上。研究表明递减受地质与非地质因素共同影响。渗透率与采出程度是递减主控地质因素,较难改变。而系统压力、煤矿采掘、管线凝析水等外部状况均会导致单井出现非地质因素影响而出现气量持续下降情况。通过递减机理研究有助于理解递减、控制递减、制定稳产政策,为煤层气井稳产提供技术支撑.

South Fanzhuang Block is located in the south of Qinshui Basin and was put into development in 2006.The practice of coalbed methane development in the recent decade shows that decline is the objective production law of single well and gas field development,and the decline period accounts for more than 70%of the life cycle of a single well.The study shows that the decline is affected by both geological and non-geological factors.The permeability and the recovery degree are the main geological factors controlling the decline,which are difficult to change.The system pressure,coal mining,pipeline condensate water and other external conditions will lead to non-geological factors of a single well and cause the gas volume to continue to decline.The study of the decline mechanism will be helpful to understand and control the decline,to formulate stable production policies,and to provide technical support for the stable production of coalbed methane wells.