Risk Planning and Mitigation in Oil Well Fields: Preventing Disasters

Nediljka Gaurina-Međimurec, Borivoje Pašić and Petar Mijić
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Nediljka Gaurina-Međimurec: Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Zagreb, Croatia
Borivoje Pašić: Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Zagreb, Croatia
Petar Mijić: Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Zagreb, Croatia

International Journal of Risk and Contingency Management (IJRCM), 2015, vol. 4, issue 4, 27-48

Abstract: Lost circulation presents one of the major risks associated with drilling. The complete prevention of lost circulation is impossible but limiting circulation loss is possible if certain precautions are taken. Industry experience has proved that is often easier and more effective to prevent the occurrence of loss than to attempt to stop or reduce them once they have started. The problem of lost circulation was magnified considerably when operators began drilling deeper and/or depleted formations. A strategy for successful management of lost circulation should include preventative (best drilling practices, drilling fluid selection, and wellbore strengthening materials) and remedial measures when lost circulation occurs through the use of lost circulation materials. In this paper the authors present lost circulation zones and causes, potential zones of lost circulation, excessive downhole pressures causes, preventive measures, tools and methods for locating loss zones and determining the severity of loss, lost circulation materials, and recommended treatments.

Date: 2015
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