DYNAMIC ANALYSIS OF BOREHOLE WALL STABILITY IN THE DRILLING PROCESS

doi:10.3863/j.issn.1000-2634.2008.03.042

西南石油大学学报(自然科学版) ›› 2008, Vol. 30 ›› Issue (3): 163-166.DOI: 10.3863/j.issn.1000-2634.2008.03.042

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DYNAMIC ANALYSIS OF BOREHOLE WALL STABILITY IN THE DRILLING PROCESS

LIAN Zhang-hua¹,LIU Xin¹,FANG Hao²,YANG Bin¹,XIAO Zhou¹

1.The State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation ·Southwest Petroleum University,Chengdu,Sichuan 610500,China;2.Downhole Operation Department,Sichuan Petroleum Administration Bureau,Chengdu Sichuan 610000,China

Received:2007-04-11 Revised:1900-01-01 Online:2008-06-20 Published:2008-06-20

Abstract

Abstract: Most of the Borehole stability investigations in existence are static,which approximate rock to invariant mechanical isotropic body.So the conclusion may deviate with the real situation during the dynamic drilling process.With the formula based on the Mohr-Coulomb strength criterion,applicable safe density window of drilling fluid is calculated in this paper then,with the Lifeanddeath element method,drilling process and buildup of the mud cake and contaminated zone are simulated.Integrating the conclusion of simulation with the theoretic safe density window of drilling fluid,the dynamic alternating regulation of borehole wall stress during the drilling process is investigated.

Key words: borehole wall stability, finite element, orthotropy, drilling damage zone, mud cake

CLC Number:

TE28

LIAN Zhang-hua;LIU Xin;FANG Hao;YANG Bin;XIAO Zhou. DYNAMIC ANALYSIS OF BOREHOLE WALL STABILITY IN THE DRILLING PROCESS[J]. 西南石油大学学报(自然科学版), 2008, 30(3): 163-166.

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http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2008/V30/I3/163

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DYNAMIC ANALYSIS OF BOREHOLE WALL STABILITY IN THE DRILLING PROCESS

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