各向异性地层重复压裂最优时机及影响因素分析  

Study on optimal re-fracturing timing in anisotropic formation and its influencing factors

作　　者：张广清[1,2] 陈勉[1] 姚飞[1] 赵振峰[1] 

机构地区：[1]中国石油大学石油天然气工程学院,北京102249 [2]中国石油大学城市油气输配技术北京市重点实验室,北京102249

出　　处：《石油学报》2008年第6期885-888,893,共5页Acta Petrolei Sinica

基　　金：国家自然科学基金项目(No.90510005)“深层应力敏感性复杂地层的钻井液漏失规律研究”;高等学校博士学科点专项科研基金项目(20070425026)“深层三维复杂天然裂缝系统对水力裂缝动态扩展的影响研究”联合资助

摘　　要：依据低渗透储层力学参数和渗流特点,建立了考虑地层各向异性的固-液耦合最佳重复压裂时机模型,提出了等应力点的概念。对多因素影响下的最佳重复压裂时机的研究表明,远场水平地应力差较小、弹性模量较大、初次裂缝长度和宽度较大、低渗透、初次改造后平均生产压差较大等影响因素对重复压裂产生新缝有利。将影响因素分为3类:①产生重复压裂新裂缝的影响因素;②仅影响最优重复压裂时机的因素;③可以忽略的因素。Based on the mechanical properties and porous flow parameters of low permeability reservoir,an optimal re-fracturing timing model considering solid-fluid coupling in anisotropic formation was established, and the concept of equal stress point was proposed. The small stress difference,large elastic modulus,large length and width of initial fracture, low permeability, and large pres sure drawdown are the favorable factors for creation of new fractures in re fracturing. Those influencing factors are further classified into three groups： ①the factors for deciding whether new fracture be created; Othe factors only affecting the optimal re-fracturing timing; ②the negligible factors.

关 键 词：各向异性地层 重复压裂 最优压裂时机 局部应力场 等应力点 固液耦合 数学模型 

分 类 号：TE357.11[石油与天然气工程—油气田开发工程]