低渗油藏整体压裂数学模型研究与应用  

RESEARCH ON THE MATHEMATICAL MODE OF INTEGRAL FRACTURING IN LOW PERMEABILITY RESERVOIR

作　　者：王益维[1,2] 张士诚[1] 李宗田[2] 苏建政[2] 付永强[3] 

机构地区：[1]中国石油大学 [2]中国石化石油勘探开发研究院 [3]西南油气田分公司采气工程研究院

出　　处：《钻采工艺》2010年第3期64-66,71,共4页Drilling & Production Technology

基　　金：国家863计划"深层低渗透油气藏压裂改造关键技术"课题资助(编号:2006AA06Z226)

摘　　要：低渗油藏往往存在启动压力,以往的整体压裂数学模型中的相对渗流率计算没有考虑启动压力和支撑裂缝失效的共同影响,通过长期导流能力的实验,回归支撑裂缝导流能力与闭合应力及时间的变化关系式,在此基础上建立了考虑启动压力和水力裂缝长期导流能力的整体压裂数学模型,并对整体压裂模型进行求解,分析了裂缝长度和导流能力对油井产能的影响,模型更能够反映低渗透储层的渗流特征,可用于指导低渗储层的整体压裂优化设计。The start-up pressure exists in low permeability reservoir,however,the start-up pressure and conductivity of propping fracture are usually neglected in calculating relative permeability by using integral fracturing mathematical model.This article established a new mathematical mode of integral fracturing by means of combining the result of flooding and conductivity experiments.The start-up pressure and conductivity decline were considered in new model.The effect of fracture length and conductivity on oil well productivity was analyzed,the calculation results indicated that the new model could accuraTely show the percolation features of low permeability reservoir and guide integral fracturing design for low permeability reservoir.

关 键 词：低渗 整体压裂 模型 启动压力 导流能力 

分 类 号：TE357[石油与天然气工程—油气田开发工程]