非常规天然气

基于分形理论的煤储层水力压裂裂缝数值模拟

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  • 1.河南理工大学能源科学与工程学院,河南 焦作 454000;
    2.中原经济区煤层气(页岩气)协同创新中心,河南 焦作 454000;
    3.中国石油华北油田分公司勘探开发研究院,山西 长治 046000;
    4.河南省地质矿产勘查开发局第四地质矿产调查院,河南 商丘 476000
张小东(1971-),男,河南温县人,教授,博士生导师,博士,主要从事煤层气地质与工程、煤地球化学研究. E-mail:z_wenfeng@163.com.

收稿日期: 2015-01-20

  修回日期: 2015-05-08

  网络出版日期: 2015-10-10

基金资助

国家自然科学基金资助项目(编号:41372162);河南省高校科技创新团队支持计划(编号:14IRTSTHN002)联合资助.

Numerical Simulation of Fracture Extending in Coal Seam under Hydraulic Fracturing Engineering Based on Fractal Theory

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  • 1.School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo  454000,China;
    2.Collaborative Innovation Center of Coalbed Methane(Shale Gas) in Central Plains Economic Zone,Jiaozuo 454000,China;
    3.Exploration and Development Research Institute of Huabei Oilfield Company,PetroChina,Changzhi 046000,China;
    4.NO.4 Institute of Geological and Mineral Resources Survey of Henan,Shangqiu 476000,China

Received date: 2015-01-20

  Revised date: 2015-05-08

  Online published: 2015-10-10

摘要

根据多孔介质孔隙度及水力强化过程中裂缝扩展的分形特征,建立了分形煤储层宏观物性参数孔隙度与渗透率的理论关系模型,以及水力致裂过程中煤岩断裂韧度、压裂液滤失系数的分形计算模型。基于此,在拟三维压裂裂缝扩展模型的假设条件下,构建了基于分形理论的煤层水力压裂裂缝扩展模型。以郑庄区块8口评价井为参考,应用构建的分形模型对压裂裂缝几何参数进行了计算。计算结果表明:郑庄区块水力压裂裂缝缝长一般为106.8~273.1m,缝高一般为3.6~12.7m。通过与不同模型的计算结果相比较,发现该模型预测结果更接近于实测值,一定程度上反映了该模型的适用性。

本文引用格式

张小东,张硕,杨艳磊,张鹏,魏高洋 . 基于分形理论的煤储层水力压裂裂缝数值模拟[J]. 天然气地球科学, 2015 , 26(10) : 1992 -1998 . DOI: 10.11764/j.issn.1672-1926.2015.10.1992

Abstract

According to the fractal characteristics of porosity of porous media and fracture extending in the hydraulic strengthening process,the fractal theoretical relationship between porosity and permeability in the coal seam is established.Further,the fractal calculation models of the fracture toughness and the filtration coefficient of fracturing fluid under the hydraulic fracturing are also built.Based on all of these studies above,the fracture extending model is set up under the assumed condition of pseudo-three-dimensional fracture extending model.The geometric parameters of fracture for the eight CBM wells in Zhengzhuang block of Qinshui coal basin,Shanxi province,are calculated by means of the fractal models.The results show that the fractures′ lengths of hydraulic fracture vary from 106.8m to 273.1m,and the widths range from 3.6m to 12.7m in the study block.Through comparing the calculation results with different models,it shows the results of the fractal model fit well with the field measured value,which reflects the applicability of the model at some extent.

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