Engineering Research Center of the Ministry of Education for Gas Energy Development & Utilization,China University
of Petroleum(Beiing) China University of Petroleum(eiing) China United Coalbed Methane Corporation,Ltd.
Coalbed Methane Gas Exploration and Development Branch,PetroChina Huabei Oilfield Company West Sichuan
Gas Production Plant, Southwest Oil/Gas Field Branch,SINOPEC

合理的煤层气井井底流压初期下降制度是决定煤层气井高产和稳产的重要因素,应用模糊数学的基本方法分析柿庄南区块煤层气排采初期高产井井底流压下降制度,将影响煤层气排采初期井底流压下降制度的因素记作一个模糊集合,确定其权重分配并构造隶属函数,为调整煤层气低产井的井底流压压降制度或为未投入运行井制定合理的井底流压下降制度提供依据。通过某高产井L-1的验证,该方法确定的压降制度在区域7内与实际压降制度符合较好,压降特征参数的相对误差均小于20%,说明模糊数学方法能够用以优化煤层气排采初期井底初期流压下降制度。

The reasonable hole bottom fluid pressure drop control of coalbed methane(CBM) well was important to make the well get thehigh and stable production. A new method to optimize the reasonable hole bottom fluid pressure drop control had been put forward in thispaper. Based on the analysis of the characteristics of high prod uction wells' hole bottom fluid pressure drop in Shizhuang South Block,thispaper viewed those factors that influenced the hole bottom fluid pressure drop system as a fuzzy set,decided the weight of every factor andused subordinate function to optimize the production of CBM wells,which meant adjusting the hole bottom fluid pressure drop syst em forthe low-production CBM wells or making the reasonable and scientific scheme of hole bottom fluid pressure drop for those wells that hadnot been put into service. Th is method was verified through some high-production Well L-1 and the hole bottom fluid pressure drop systemdetermined by this method coincided well with the actual syst em of Area 7 and the errors of the influencing factors were all less than 20%. This example proved that Fuzzy Mathemactical Method could be used to optimize the hole bott om fluid pressure drop system.

国家科技重大专项资助项目(2011ZX05042)；