Non-conventional Resources Exploration and Development of East China Branch Company,SINOPEC School of
Environmental Protection and Safety Engineering,University of South China

以延川南区块81口煤层气井实际生产数据为基础,分析了煤层气井之间的生产特征差异性和产气量控制因素。统计结果表明,在单井产液量方面,煤层气井可划分为高产液量井、中液量井和低液量井3种类型;在单井产气量方面,煤层气井在中、低液量井中产气量较高。研究认为,小型地质构造对煤层气产能开发具有重要影响。一般而言,小断层附近的煤层气井由于断层导水产气量较低,而张裂隙发育小褶皱构造由于渗透性较好而产气量较高。因此,应加强区块煤储层小构造研究,找出有利靶区,为煤层气大规模开发做准备。

According to the production data of 81 coalbed methane( CBM) production wells of southern Yanchuan CBM Block,the gas production characteristicof differ ent CBM wells were studied and the controlling factors of gas production were disscussed in the paper. The statistical results showed that there were 3 types wells divided into on the CBM well water production,which were high water production well, normal water production well and low water production well. Meanwhile ,the gas production of the last two CBM water production wells was ltter higher than the first type CBM well for single gas production well. The results also showed that the gas production of CB M well was influenced obviously by the small geological structure. Generaly,the gas production of CBM wells was higher when wells located far from the small fault with wa ter flowing or nearly to the small fold with well permeability. Otherwise,the gas production was limited. Thus,it was necessary to further research the small geological struct ure of the CBM block to find out the favorable target with higher gas production for the large scale exploitation.

国家科技重大专项资助项目(2011ZX05033)；