Wellbore stability analysis and well path optimization based on the breakout width model and Mogi-Coulomb criterion

doi:10.1016/j.petrol.2015.10.029

CORC > 武汉岩土力学研究所 > 中科院武汉岩土力学所 > 岩土力学所知识全产出 > 期刊论文

	Wellbore stability analysis and well path optimization based on the breakout width model and Mogi-Coulomb criterion
	Ma, Tianshou 1,2,3; Chen, Ping 1; Yang, Chunhe 2; Zhao, Jian 3
刊名	JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
	2015
卷号	135 页码:678-701
关键词	Wellbore stability Failure criteria Breakout width Mogi-Coulomb Mohr-Coulomb
ISSN号	0920-4105
DOI	10.1016/j.petrol.2015.10.029
英文摘要	The failure criterion is a very important aspect of the wellbore stability analysis. But the Mohr-Coulomb criterion, a most commonly used failure criterion, is usually too conservative, due to the influence of the intermediate principal stress is not taken into account. Furthermore, the safe mud weight (MW) predicted by the conventional method is usually too high, due to the safe MW is predicted to yield no shear failure around the borehole. To solve the above problems, a semi-analytic model of wellbore stability analysis was proposed based on the stress distribution model, failure criteria and the breakout width model. The Mogi-Coulomb criterion, a new true-triaxial failure criterion, is involved in this semi-analytic model to determine the shear failure. The computational models of the lowest and highest safe MW are derived for different failure mode. The numerical method and flowchart of this semi-analytic model is provided, and a computer program is also developed in Matlab software. The impacts of the failure criteria, stress regimes and breakout width had been systematically analyzed. The optimal well path had been optimized for different stress regimes. The results showed that the lowest safe MW predicted by Mogi-Coulomb criterion is always lower than the Mohr-Coulomb criterion. The most stable drilling direction is along the minimum horizontal stress for the NF and NF-SS stress regimes, while it's along the maximum horizontal stress in the SS, SS-RF and RF stress regimes. If the breakout width model is used, the lowest safe MW is always lower than the traditional method. The optimal well path and the wellbore stability are different between traditional and new methods. The most stable path is always the horizontal and deviated well for the traditional method, instead, it's always the vertical well for this new method, it's more consistent with the actual situation. These results also illustrated that an acceptable breakout is usually allowed to occur in the actual borehole, and the borehole still has enough arc to support the wellbore wall and to prevent collapse accident. Finally, both of the traditional and new methods are applied in the field case studies. The results showed that the lowest safe MW predicted by the integration of the breakout width model and Mogi-Coulomb criterion is closest to the real MW, instead, the lowest safe MW predicted by the traditional methods has exceeded the actual MW. It also illustrated the traditional method is too conservative in predicting wellbore stability, while this new method is more accurate for the integration of the breakout width model and MG-C criterion. This research can provide support to optimize the well path and MW in the drilling practices. (C) 2015 Elsevier B.V. All rights reserved.
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000365430800070
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/3778]
专题	岩土力学所知识全产出_期刊论文国家重点实验室知识产出_期刊论文
作者单位	1.Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn ; 3.Monash Univ, Dept Civil Engn
推荐引用方式 GB/T 7714	Ma, Tianshou,Chen, Ping,Yang, Chunhe,et al. Wellbore stability analysis and well path optimization based on the breakout width model and Mogi-Coulomb criterion[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2015,135:678-701.
APA	Ma, Tianshou,Chen, Ping,Yang, Chunhe,&Zhao, Jian.(2015).Wellbore stability analysis and well path optimization based on the breakout width model and Mogi-Coulomb criterion.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,135,678-701.
MLA	Ma, Tianshou,et al."Wellbore stability analysis and well path optimization based on the breakout width model and Mogi-Coulomb criterion".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 135(2015):678-701.