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Rudarsko-geološko-naftni zbornik, Vol. 19 No. 1, 2007.

Review article

WELLBORE INSTABILITY: CAUSES AND CONSEQUENCES

Borivoje Pašić
Nediljka Gaurina Međimurec
Davorin Matanović

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page 87-98

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Abstract

Wellbore instability is one of the main problems that engineers meet during drilling. The causes of wellbore instability are often classified into either mechanical (for example, failure of the rock around the hole because of high stresses, low rock strength, or inappropriate drilling practice) or chemical effects which arise from damaging interaction between the rock, generally shale, and the drilling fluid. Often, field instances of instability are a result of a combination of both chemical and mechanical. This problem might cause serious complication in well and in some case can lead to expensive operational problems. The increasing demand for wellbore stability analyses during the planning stage of a field arise from economic considerations and the increasing use of deviated, extended reach and horizontal wells. This paper presents causes, indicators and diagnosing of wellbore instability as well as the wellbore stresses model.

Keywords

well; instability; stress

Hrčak ID:

19296

URI

https://hrcak.srce.hr/19296

Publication date:

4.12.2007.

Article data in other languages: croatian

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