西南石油大学学报(自然科学版) ›› 2001, Vol. 23 ›› Issue (6): 12-12–13.DOI: 10.3863/j.issn.1000-2634.2001.06.04

• 石油工程 • 上一篇    下一篇

岩石软弱面产状对井壁稳定性的影响

刘向君1 陈一健1 肖勇2   

  1. (1.西南石油学院石油工程学院,四川 南充 637001; 2.北方国际合作股份有限公司)
  • 收稿日期:2001-03-29 修回日期:1900-01-01 出版日期:2001-12-20 发布日期:2001-12-20

EFFECT OF WEAK’PLANE DIP ANGLE AND DIP AZIMUTH ANGLE ON WELLBORE STABILITY

LIU Xiang-jun1 CHEN Yi-jian1 XIAO Yong2   

  1. (Southwest Petroleum Inst, Nanchong Sichuan 637001, China)
  • Received:2001-03-29 Revised:1900-01-01 Online:2001-12-20 Published:2001-12-20

摘要:

在连续介质力学井壁稳定性分析的基础上,采用简化的岩石软弱面地质模型和力学模型,计算分析了岩石软弱面倾角和倾斜方位角改变对直井、斜井井壁稳定性的影响。结果表明:相同作业条件下,岩石软弱面的稳定性明显低于基质岩块的稳定性,当井周围存在裂缝或节理等软弱面时,井壁的稳定性将受到软弱面的影响而明显降低;斜井条件下,井壁失稳的位置和失稳的程度与软弱面的产状密切相关;直井条件下,井壁垮塌的方位将可能偏离原地最小水平主应力的方位,而主要取决于岩石软弱面的倾角和倾斜方位角。

关键词: 岩石软弱面, 井壁稳定, 强度准则, 直井, 斜井

Abstract:

On the basis of continuous media mechanics, the effects of weak plane occurrence and fictions coefficient on wellbore stability of vertical well and deviated well have been studied by using of a simplified geological model and mechanics model of rock wed plane in this paper. Results show that wellbore stability decreases sharply because of fractures and joints around borehole. For deviated well, wellbore stability depends on not only in-situ stress but also weak plane occurrence. For vertical well, the collapse azimuth of wellbore is different from in-situ minimum horizontal stress, but depend on occurrence of weakplane mainly.

Key words: weakplane, wellbore, stability, strength criteria, vertical well, deviated well

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