School of Energy Science and Engineering, Henan Polytechnic University State Key Laboratory Cultivation Base
for Gas Geology and Gas Control College of Geosciences and Surveying Engineering, China University of Mining &
Technology ( Beiing)

为得到煤储层水力压裂后的渗透率,基于水力压裂施工曲线和注入/压降试井测试渗透率原理,建立了水力压裂后渗透率预测模型。根据晋城矿区潘庄区块和焦作矿区恩村区块煤层气的勘探开发资料,验证了模型的准确性和有效性。结果表明:Ⅲ、Ⅳ类煤体所占比例、压裂后裂缝是否连通构造异常带对预测结果的准确性影响较大;Ⅲ、Ⅳ类煤体比例比较小时,压裂液容易在硬煤中形成裂缝,预测结果较准确;当Ⅲ、Ⅳ类煤体比例较大时,压裂液容易在煤粒间流动,预测结果不能真实反映压裂效果。

In order to obtain the permeability of the coal reservoir after hydraulic fracture, based on the pressure curve of the hydraulic fracturing and the principle of testing permeability by injection /fall-off well-test, the prediction model about the permeability of the coal reservoir after hydraulic fracture was established. According to the data of the exploration and development about coalbed methane in Panzhuang Block of Jincheng Mine Area and in Encun Block of Jiaozuo Mine Area, the accura cy and effectiveness of the model was verified.The results showed that the proportion of耳and IV class in the coal seam section and whether connecting the anomaly s tructure belt after hydraulic fracturing were important influence on the accuracy of the prediction results. When the proportion of and IV class in the coal seam sectio n was small, the fracturing could easily form in the hard coal, the prediction results were accurate. When the proportion of I and IV class in the coal seam section was larger, the fracturing fluid could easily flow in the coal particles and coal particles, the prediction results could not reflect the fracturing effect.

国家科技重大专项资助项目(2011ZX05034-005)；河南省教育厅科学技术研究重点资助项目(14A440005)；河南理工大学杰出青年基金资助项目(J2013-03)；