西南石油大学学报(自然科学版) ›› 2001, Vol. 23 ›› Issue (3): 37-39.DOI: 10.3863/j.issn.1000-2634.2001.01.011

• 石油工程 • 上一篇    下一篇

裂缝面及井眼附近的应力分析

练章华1 康毅力1 徐进2 徐兴华2   

  1. 1.西南石油学院,四川 南充 637001;2.中国新星石油公司西南石油局
  • 收稿日期:2000-09-22 修回日期:1900-01-01 出版日期:2001-08-20 发布日期:2001-08-20
  • 通讯作者: 练章华

STRESS ANALYSIS ON FRACTURE AND NEAR WELLBORE

LIAN Zhang-hua1 KANG Yi-li1 XU Jin2 et al   

  1. Southwest Petroleum Inst, Nanchong Sichuan 637001, China
  • Received:2000-09-22 Revised:1900-01-01 Online:2001-08-20 Published:2001-08-20
  • Contact: LIAN Zhang-hua

摘要: 从力学角度出发,建立了川西致密气层井眼、裂缝面及地层的有限元模型,应用ANSYS软件仿真模拟了裂缝面与水平面夹角的变化引起裂缝面上及井眼附近的应力变化。重点研究了水平裂缝面上及井眼附近的主应力和等效应力的应力等值线变化规律。随着地层裂缝倾角的增加,裂缝面上井眼附近的最大等效应力逐渐转移到井眼椭圆截面的短轴两端附近。研究结果对进一步研究井眼稳定、井壁崩落方向或裂缝面上的应力敏感性具有指导意义。

关键词: 裂缝, 主应力, 等效应力, 有限元模型

Abstract: Based on the mechanics theory, the paper presented the FEM model of wellbore, fracture and formation for tight gas sandstone reservoirs in western Sichuan basin, and simulating the angle change between the fracture and horizontal plane resulting in the stress change on the fracture and near wellbore.This paper mainly studied the change principle of the principal
stresses and equivalent stresses on the horizontal plane fracture and near the wellbore. With the increasing of the incline angle of formation fracture, the maximum equivalent stresses near the wellbore on the fracture gradually transferred to the two ends of the borehole ellipse cross-section shorter axis. It is a guidance meaning to further study the borehole stability, the breakout direction of borehole wall or the stress sensitive on the fracture.

Key words: fracture, principal stress, equivalent stress, FEM model

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