潘庄区块煤层气井层间干扰数值模拟研究

以沁水盆地南部潘庄区块W01井为研究对象,运用Comet3数值模拟软件拟合了3#、15#煤层的实际排采数据,反演了煤储层的渗透率、含气量等煤储层参数,引入干扰系数的概念,采用控制单一变量的方法,讨论了储层参数对层间干扰系数的敏感性,并通过模拟单采、合采条件下煤层气产量及储层压力的变化,探讨了煤层气井排采过程中层间干扰的形成机制。研究表明:合层排采时,层间干扰程度随着煤层气井开发呈现先减小后增大再减小的特点;渗透率、孔隙度、朗氏体积是层间干扰的主要影响因素,原始储层压力的影响较小。

Numerical simulation on interlamination interference of CBM well in Panzhuang Block

Based on coal geological exploration data, CBM testing drilling data and production data, W01 well of Panzhuang Block in southern Qinshui Basin was taken as the research object, the actual production data of 3# and 15# coal was fitted by Comet3 numerical simulation software to get some important reservoir parameters like reservoir permeability and gas content. Interference Coefficient was introduced to this paper and its sensitivity to reservoir parameters was discussed by controlling single variable method. According to the simulate of CBM production and reservoir pressure under the condition of single layer exploitation and commingled exploitation, the formation mechanism of interlamination interference during exploration was discussed. The results show that there is a big difference in coal reservoir pressure variation and delivery between single layer exploitation and commingled exploitation. Moreover, every coal seam has its unique reservoir character. All of these cause the great diversity in coal seam proportion within critical desorption pressure and CBM desorption ability and further make Interllamination interference. With the gas exploration, the Interllamination interference extent will decrease first and then increase and then decrease again. What affect Interllamination interference most are Permeability, porosity and Langmuir volume of coal while original reservoir pressure affects less.