Wellbore stability analysis to determine the safe mud weight window for sandstone layers

被引：0
|
作者：
Darvishpour A. [1 ]
Seifabad M.C. [1 ]
Wood D.A. [2 ]
Ghorbani H. [3 ]
机构：
[1] Department of Mining Engineering, Isfahan University of Technology, Isfahan
[2] DWA Energy Limited, Lincoln
[3] Southern Oil Fields, National Iranian Oil Company, Teheran
来源：
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | 2019年 / 46卷 / 05期
关键词：
Drilling stress simulation; Safe mud weight window; Wellbore geomechanical property; Wellbore instability risk factors; Wellbore stability;
D O I：
10.11698/PED.2019.05.17
中图分类号：
学科分类号：
摘要：
The wellbore stability of a vertical well through the sandstone reservoir layers of the Asmari oil-bearing formation in south-west Iran is investigated. The safe drilling-fluid density range for maintaining wellbore stability is determined and simulated using FLAC3D software and a finite volume model established with drilled strata geomechanical features. The initiation of plastic condition is used to determine the safe mud weight window (SMWW) in specific sandstone layers. The effects of rock strength parameters, major stresses around the wellbore and pore pressure on the SMWW are investigated for this wellbore. Sensitivity analysis reveals that a reduction in cohesion and internal friction angle values leads to a significant narrowing of the SMWW. On the other hand, the reduction of pore pressure and the ratio between maximum and minimum horizontal stresses causes the SMWW to widen significantly. The ability to readily quantify changes in SMWW indicates that the developed model is suitable as a well planning and monitoring tool. © 2019, The Editorial Board of Petroleum Exploration and Development. All right reserved.
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页码：974 / 980and1014
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