天然气开发

致密砂岩气藏缝网系统渗流力学和岩石断裂动力学

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  • (1.中国石油大学(北京),北京  102249;2.中核集团中国核电工程有限公司,北京  100840)
赵海峰(1980),男,安徽舒城人,副教授,博士,主要从事石油工程岩石力学研究. Email:zhaohf@cup.edu.cn.

收稿日期: 2015-03-07

  修回日期: 2015-04-16

  网络出版日期: 2016-02-10

基金资助

国家科技重大专项课题(编号:2016ZX05009004);中国石油大学(北京)基金(编号:ZX20150191)联合资助.

Fluid mechanics and rock fracture kinetics of fracture mesh system in tight sand gas reservoirs

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  • (1.School of Petroleum Engineering,China University of Petroleum,Beijing 102249,China;
    2.China Nuclear Power Engineering Co.Ltd.,Beijing 100840,China)

Received date: 2015-03-07

  Revised date: 2015-04-16

  Online published: 2016-02-10

摘要

基于渗流力学方程和伽辽金法建立水平井体积压裂缝网渗流场的有限元模型,研究了不同缝网形式与规模下产能随缝网导流能力的变化关系,研究发现致密砂岩与页岩不同,压裂的缝网规模并非越大越好,而应该维持在中小规模(0.1≤FCI≤0.25),且需要高导流能力的支撑主缝。在确定了裂缝形态的基础上,计算得到产能与SRV曲线,研究发现存在SRV临界值(优化值),若SRV超出临界值,产能增幅明显变小。在压裂实践中可由SRV临界值和FCI值,确定水平井分段压裂簇间距和簇数之间的关系。研究了形成中小规模缝网对应的施工条件,首先由岩石断裂动力学给出压裂液排量、黏度、岩石动态断裂韧性、弹性模量、地应力、天然裂缝参数与缝内净压力之间的解析关系,再由缝网前沿动态扩展条件给出形成中小缝网所需排量(优化排量)。

本文引用格式

赵海峰,蒋迪,石俊 . 致密砂岩气藏缝网系统渗流力学和岩石断裂动力学[J]. 天然气地球科学, 2016 , 27(2) : 346 -351 . DOI: 10.11764/j.issn.16721926.2016.02.0346

Abstract

Based on fluid mechanics equations and the Galerkin method,a finite element model has been established to simulate fracture mesh seepage field of horizontal wells volume fracturing,and the relationship between fracture mesh conductivity and production has been studied under different fracture mesh scale.Unlike shale gas,fracture mesh scale is not the bigger the better for tight sand stone gas.It should be maintained in a smalltomedium scale (0.1≤FCI≤0.25) and a high conductivity main fracture is also required.From production SRV curve,it is found that there exists a critical SRV value (optimal value),and the production increase is significantly smaller when SRV is beyond the critical value.In practice,together with SRV,the critical SRVconditions to form smalltomedium scale fracture mesh.An analytic relationship among fracturing fluid pump rate,viscosity,rock dynamic fracture toughness,elastic modulus,Poisson’s ratio,stress,natural fracture parameters and fracture net pressure is given by rock fracture kinetics,and then the optimized pump rate to form smalltomedium scale fracture mesh is determined by dynamic extension conditions on the fracture mesh edge.

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