Model study of borehole stability

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:93040

Wang, X; Guo, Y; Li, Y ^[1]; Liu, G ^[2]

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1. Univ. of Science and Technology of China, Hefei (China). Dept. of Modern Mechanics
2. Maurer Engineering Inc., Houston, TX (United States)

Hole problems during the drilling phase of operations are often the consequence of mechanical wellbore instability and will dramatically increase the drilling cost. A number of analytical and numerical modern; are available for diagnosis and prediction of wellbore instability. Firstly, this paper reviews the merits and pitfalls of the mode; widely used in hollow cylinder tests and field situations. Two main elements, that is, the constitutive relations and the failure criteria of the rocks are stressed in the borehole stability analysis. Some typical models including two linear elastic models, the stress dependent modulus elastic model and the elastoplastic model are especially discussed in the paper. To illustrate the performance and the availability of the typical models, case studies are carried out by analytic solutions or numerical simulations with finite element method. The results show that it is possible to diagnose the borehole instability if one can choose a suitable behavior rule of the rock and an available failure criterion for a given formation.

• OSTI ID: 93040
• Report Number(s): CONF-940113--; ISBN 0-7918-1182-4
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
42 ENGINEERING
BOREHOLES
DIAGNOSTIC TECHNIQUES
FAILURES
MATHEMATICAL MODELS
PETROLEUM INDUSTRY
ROCK MECHANICS
STABILITY