Defining Mud Density Under Conditions of Unequal Horizontal Stresses

doi:10.3863/j.issn.1000-2634.1998.03.012

西南石油大学学报(自然科学版) ›› 1998, Vol. 20 ›› Issue (3): 45-48.DOI: 10.3863/j.issn.1000-2634.1998.03.012

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Defining Mud Density Under Conditions of Unequal Horizontal Stresses

Ma De-xing

( Bohai Oil Company of China Offshore Oil Company, Tianjin, 300452)

Received:1998-03-17 Revised:1900-01-01 Online:1998-08-20 Published:1998-08-20
Contact: Ma Dexing

Abstract

Abstract: Lowering pressure difference on production zone and keeping well wall stability are problems much needed to be solved in petroleum engineering, espe-cially in areas with abnormal rock stress. Based on the theory of elasto-plasticity and rock mechanics, applying Mohr-Coulomb yield criteria, this paper
presents a mechanism of elasto-plastic state occur-ring in rocks around the wellbore, describes the cor-responding distribution of stress and displacement, and formulates the equation relating mud hydraulic
pressure, horizontal rock stress to rock strength.Compared with other approaches, range of mud den-sity values required for a stable well wall is wider in this approach, which is beneficial to lowering pres-sure difference on production zone and to performing near balance drilling.

Key words: Hole stability, Rock stress, Displacement, Mud viscosity

CLC Number:

TE21　TE249·1

Ma De-xing. Defining Mud Density Under Conditions of Unequal Horizontal Stresses[J]. 西南石油大学学报(自然科学版), 1998, 20(3): 45-48.

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Defining Mud Density Under Conditions of Unequal Horizontal Stresses

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