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Borivoje Pašić
Nediljka Gaurina Međimurec
Davorin Matanović

Fulltext: english, pdf (6 MB) pages 87-98 downloads: 24.654* cite
APA 6th Edition
Pašić, B., Gaurina Međimurec, N. & Matanović, D. (2007). WELLBORE INSTABILITY: CAUSES AND CONSEQUENCES. Rudarsko-geološko-naftni zbornik, 19 (1), 87-98. Retrieved from
MLA 8th Edition
Pašić, Borivoje, et al. "WELLBORE INSTABILITY: CAUSES AND CONSEQUENCES." Rudarsko-geološko-naftni zbornik, vol. 19, no. 1, 2007, pp. 87-98. Accessed 11 May 2021.
Chicago 17th Edition
Pašić, Borivoje, Nediljka Gaurina Međimurec and Davorin Matanović. "WELLBORE INSTABILITY: CAUSES AND CONSEQUENCES." Rudarsko-geološko-naftni zbornik 19, no. 1 (2007): 87-98.
Pašić, B., Gaurina Međimurec, N., and Matanović, D. (2007). 'WELLBORE INSTABILITY: CAUSES AND CONSEQUENCES', Rudarsko-geološko-naftni zbornik, 19(1), pp. 87-98. Available at: (Accessed 11 May 2021)
Pašić B, Gaurina Međimurec N, Matanović D. WELLBORE INSTABILITY: CAUSES AND CONSEQUENCES. Rudarsko-geološko-naftni zbornik [Internet]. 2007 [cited 2021 May 11];19(1):87-98. Available from:
B. Pašić, N. Gaurina Međimurec and D. Matanović, "WELLBORE INSTABILITY: CAUSES AND CONSEQUENCES", Rudarsko-geološko-naftni zbornik, vol.19, no. 1, pp. 87-98, 2007. [Online]. Available: [Accessed: 11 May 2021]

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.

well; instability; stress

Hrčak ID: 19296



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