潘河地区煤层气井排采制度优化

CBM Well Production System Optimization in Panhe Area

基于沁水盆地南部潘河地区煤层气地质特征以及PH01井和PH02井排采资料,结合COMET3储层模拟软件,对两口井进行历史拟合和制度优化。结果表明,当PH01井初始最大产水量为3m3/d时,最大累计产气量能达800.4×104m3;PH02井初始最大产水量为5m3/d时,最大累计产气量达700.1×104m3。在基础地质条件相近的前提下,两口井最大累计产气量相差100.3×104m3,其原因为PH02井前期产水量比PH01井多,裂隙闭合较快,渗透率降低幅度较大,对储层伤害较大,出气较PH01井困难,产气时间较短,加之含气量不如PH01井,故最大累计产气量较低。

Based on the geological features of CBM well in Panhe Area in the south of Qinshui Basin and the production data of PHO1 and PH02 wells, using the COMET3 reservoir simulator, history matching and production system optimization are conducted for the two wells. The results indicate that when the initial maximum water production rate of PH01 and PH02 wells is 3 and 5 m3/d, the highest cumulative gas production reaches 800.4 ×104 m3 and 700.1 ×104 m3 respectively. Under the premise of similar basic geological conditions, a 100.3×104m3 production difference of cumulative gas production for the two wells existed. The reason is that the early water production of PH02 well is higher than that of PH01 well, so fractures of PH02 well close faster and permeability reduction is larger, which is harmful to reservoir and gas output, gas production time is relatively shorter. In addition, gas content of PH01 well is less than that of PH01 well. So, the cumulative gas production of PH02 well is relatively lower.