Calculation model for water influx and controlled reserves for CBM wells with high water yield  

作　　者：Qing Feng Han Jia Zijun Huang Miao Tian Jingsong Li Xiaonan Li 

机构地区：[1]Oilfield Production Optimization Institution,China Oilfield Services Limited,Tianjin,300450,China [2]School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,266580,China

出　　处：《Petroleum Research》2018年第3期288-292,共5页石油研究（英文）

基　　金：The work was supported by the Natural Science Foundation of China(No.U1762212 and 51374181);the State Key Laboratory of CBM Enrichment Mechanisms(No.2016SZ05036-002).

摘　　要：Compared with conventional gas reservoir,percolation mechanism of coalbed methane(CBM)is completely different,it is remarkably affected by adsorption/desorption performance,pressure variation and coalbed characteristics.Then it is difficult to calculate the controlled reserves of CBM wells.Moreover,the connection of edge-bottom water or interbedded water by fractures or faults may largely increase the water yield and drainage period,leading to obvious water invasion in some CBM wells.There are few literature about the predicted production for CBM wells with high water yield.Focusing on the unconventional CBM reservoir,methods of pseudo geological reserves and production index curves are adopted to establish the calculation model of water influx and controlled reserves.It further confirms that the calculation model is successfully applicated on the CBM wells at the middle part of Qinshui Basin in China.

关 键 词：CBM well High water yield Water influx Controlled reserves Calculation model 

分 类 号：P61[天文地球—矿床学]