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 https://hrcak.srce.hr/19296
MLA 8th Edition Pašić, Borivoje, et al. "WELLBORE INSTABILITY: CAUSES AND CONSEQUENCES." Rudarsko-geološko-naftni zbornik, vol. 19, no. 1, 2007, pp. 87-98. https://hrcak.srce.hr/19296. Accessed 31 May 2020.
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. https://hrcak.srce.hr/19296
Harvard 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: https://hrcak.srce.hr/19296 (Accessed 31 May 2020)
Vancouver Pašić B, Gaurina Međimurec N, Matanović D. WELLBORE INSTABILITY: CAUSES AND CONSEQUENCES. Rudarsko-geološko-naftni zbornik [Internet]. 2007 [cited 2020 May 31];19(1):87-98. Available from: https://hrcak.srce.hr/19296
IEEE 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: https://hrcak.srce.hr/19296. [Accessed: 31 May 2020]
Abstracts 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.