介质变形对低渗透油藏压裂产能影响有限元模拟

doi:10.7623/syxb201005021

石油学报 ›› 2010, Vol. 31 ›› Issue (5): 820-824.DOI: 10.7623/syxb201005021

介质变形对低渗透油藏压裂产能影响有限元模拟

孙峰 1 薛世峰 1 仝兴华 2 李行船 3

1 中国石油大学地球资源与信息学院山东东营 257061； 2 山东大学威海分校山东威海 264209； 3 中国石化国际石油勘探开发公司北京 100083

收稿日期:2010-01-03 修回日期:2010-02-27 出版日期:2010-09-25 发布日期:2010-11-30
通讯作者: 孙峰
作者简介:孙峰，男，1979年8月生，2002年毕业于烟台大学，现为中国石油大学（华东）地质资源与地质工程专业在读博士研究生，主要从事油气田地下工程力学的研究。
基金资助:
国家科技重大专项(2008ZX05031-002-003-001)资助。

Finite element simulation on effects of medium deformation on hydraulic fracturing deliverability of low-permeability reservoir

SUN Feng 1 XUE Shifeng 1 TONG Xinghua 2 LI Xingchuan 3

Received:2010-01-03 Revised:2010-02-27 Online:2010-09-25 Published:2010-11-30

摘要/Abstract

摘要：

针对介质变形对低渗透油藏压裂产能影响的定量评价问题，建立了介质变形渗流耦合模型，并应用有限元数值模拟技术对耦合模型进行求解；采用裂缝单元模型处理水力裂缝与储层区域离散的网格尺度协调问题，即将裂缝单元的质量、刚度矩阵变换叠加到储层整体模型矩阵中模拟压裂后的开发动态。模拟分析结果表明，介质变形造成储层渗透率变化是低渗透油藏压裂产能下降的重要因素，随裂缝长度增加和生产压差增大，其影响效应更加显著。

关键词: 低渗透油藏, 介质变形, 裂缝单元, 压裂产能模拟, 有限单元法

Abstract:

In order to evaluate the sensitivity of medium deformation to the fracturing deliverability of low-permeability reservoir, the medium deformation and fluid seepage coupling model was established. The finite element method was used to solve the coupled governing equation. The fracture element was used to treat the mesh dimension problem between reservoir and fracture. The mass and stiffness matrixes of fracture element were transformed to the whole system of coordinates, assembling the matrixes and solving the finite element equations. The numerical simulation results indicated that the permeability loss resulted from the medium deformation is a key factor for decreasing hydraulic fracturing deliverability. The influence of the medium deformation gets more seriously while increasing the pressure drawdown and fracture length.

Key words: low-permeability reservoir, medium deformation, fracture element, fracturing deliverability simulation, finite element method

孙峰薛世峰仝兴华李行船. 介质变形对低渗透油藏压裂产能影响有限元模拟[J]. 石油学报, 2010, 31(5): 820-824.

SUN Feng XUE Shifeng TONG Xinghua LI Xingchuan. Finite element simulation on effects of medium deformation on hydraulic fracturing deliverability of low-permeability reservoir[J]. Editorial office of ACTA PETROLEI SINICA, 2010, 31(5): 820-824.

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介质变形对低渗透油藏压裂产能影响有限元模拟

Finite element simulation on effects of medium deformation on hydraulic fracturing deliverability of low-permeability reservoir

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