Abstract
Summary
This paper is focused on soft deep rocks that can induce strong well-bore-stability problems. In the first part, it is shown that these rocks generally exhibit plastic-type behaviors. In the second part two elasto-plastic models (Cam-Clay and Laderock) are briefly presented. In the third part, these constitutive laws are applied to wellbore stability through analytical solutions or finite element codes. Finally, in the fourth part, a case history is discussed in detail. We insist on the difficulty to properly define the boundary conditions of the problem (in-situ stresses and virgin pore pressure) and on the subjectivity of the criterion translating the boundary wellbore problem in stability recommendations. Some keys for future research are proposed.
Publisher
Society of Petroleum Engineers (SPE)
Subject
Mechanical Engineering,Energy Engineering and Power Technology
Cited by
12 articles.
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