Energies 2010, 3(10), 1639-1653; doi:10.3390/en3101639
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A Simple Analytical Approach to Simulate Underbalanced- drilling in Naturally Fractured Reservoirs—The Effect of Short Overbalanced Conditions and Time Effect

1 Norwegian University of Science and Technology (NTNU)/N-7491, Trondheim, Norway 2 Department of Petroleum Engineering University of Louisiana at Lafayette/ P.O. Box 44408 Lafayette, LA 70504, USA 3 Weatherford Petroleum Consultants, Stiklestadveien 1, N-7041 Trondheim, Norway 4 Statoil ASA, 4035 Stavanger, Norway
* Author to whom correspondence should be addressed.
Received: 6 September 2010; in revised form: 20 September 2010 / Accepted: 27 September 2010 / Published: 29 September 2010
(This article belongs to the Special Issue Oil Recovery)
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Abstract: This paper describes an analytical approach to investigate the nature of short overbalanced conditions and time effects during underbalanced drilling (UBD) in a naturally fractured reservoir. This study uses an analytical model which is developed for kinetic invasion of mud into the fractures. The model is based on fluid flow between two parallel plates, which is further extended to model the fluid flow in a fractured formation. The effect of short overbalanced pressure and the time effect during UBD as well as the aspects of well productivity and flow efficiency are explained. This model is an Excel-based program and provides a fast and convenient tool for analysis and evaluation of drilling conditions (mud properties, time, and pressure of drilling) in a fractured formation. The model can also predict the impact of the fracture and mud properties on the depth of invasion in the fractured formations.
Keywords: fractured reservoir; formation damage; underbalanced drilling; short overbalanced pressure; time effect; flow efficiency

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MDPI and ACS Style

Salimi, S.; Ghalambor, A.; Tronvoll, J.; Andersen, K.I. A Simple Analytical Approach to Simulate Underbalanced- drilling in Naturally Fractured Reservoirs—The Effect of Short Overbalanced Conditions and Time Effect. Energies 2010, 3, 1639-1653.

AMA Style

Salimi S, Ghalambor A, Tronvoll J, Andersen KI. A Simple Analytical Approach to Simulate Underbalanced- drilling in Naturally Fractured Reservoirs—The Effect of Short Overbalanced Conditions and Time Effect. Energies. 2010; 3(10):1639-1653.

Chicago/Turabian Style

Salimi, Siroos; Ghalambor, Ali; Tronvoll, Johan; Andersen, Knut Inge. 2010. "A Simple Analytical Approach to Simulate Underbalanced- drilling in Naturally Fractured Reservoirs—The Effect of Short Overbalanced Conditions and Time Effect." Energies 3, no. 10: 1639-1653.

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