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

doi:10.3863/j.issn.1000-2634.2001.06.04

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 • Previous Articles Next Articles

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

LIU Xiang-jun¹CHEN Yi-jian¹ XIAO Yong²

(Southwest Petroleum Inst, Nanchong Sichuan 637001, China)

Received:2001-03-29 Revised:1900-01-01 Online:2001-12-20 Published:2001-12-20

Abstract

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

CLC Number:

TE21

LIU Xiang-jun CHEN Yi-jian XIAO Yong. EFFECT OF WEAK’PLANE DIP ANGLE AND DIP AZIMUTH ANGLE ON WELLBORE STABILITY[J]. 西南石油大学学报(自然科学版), 2001, 23(6): 12-12–13.

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

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