1. Coal Geology of Heilongjiang Province Testing Research Center,Harbin　 150046,China; 2. China United Coalbed Methane Corporation,Ltd. ,Beijing　100011,China

干扰试井是确定井间关系、连通状况和求解井间地层特性的重要手段。煤层气已排采井在关井进行干扰试井测试时,井底压力为本井恢复压力叠加激动井干扰后的复合压力,区别于常规干扰试井背景压力为均一的原始储层压力或成线性变化的特征。提出了采用多井数值试井分析对煤层气已排采井的井底压力进行净干扰压力分离的方法;采用以数值试井、极值点分析及图版拟合等多方法相互验证的干扰试井解释方法。并以沁水盆地南部柿庄南区块A-B井组为例进行了分析,所得井间连通性及方位渗透率与该区域地质特征基本一致。测试结果对该区域压裂设计、开发方案的制定等具有重要作用。

Interference well test is an important method to determine the relation and connectivity and find the forma- tion characteristics between two wells. In interference well testing in CBM well under closed situation,the bottom pres- sure of the well is the superposition of recovery stress and composite pressure of the perturbed well after the disturb- ance,however,the background pressure of conventional interference well is uniform initial reservoir pressure or charac- terized by linear change. The paper presents a numerical multiple well test analysis method of net interference stress separation for the bottom pressure of CBM well and a mutual authentication method of interference well test interpreta- tion,such as numerical well test,the analysis of extreme value point and template fitting. Taking the analysis of A-B well group in the south of Qinshui Basin as an example,the connectivity between the two wells and the direction of permeability are the same as regional geological characteristics. The testing results play an important role in the fractu- ring design,and the development program in this area.

国家科技重大专项资助项目(2011ZX05060)；

An Jie,Liu Dawei,Zhang Ping. Research on the interpretation method and its application of interference well test analysis for CBM drain- age wells[J]. Journal of China Coal Society,2017,42(5):1236-1242.