a simple analytical approach to simulate underbalanced- drilling in naturally fractured reservoirs—the effect of short overbalanced conditions and time effect一个简单的分析方法来模拟本文u2014u2014钻井在自然断裂reservoirs-the短的平衡条件和时间效应的影响.pdfVIP

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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一个简单的分析方法来模拟本文u2014u2014钻井在自然断裂reservoirs-the短的平衡条件和时间效应的影响.pdf

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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一个简单的分析方法来模拟本文u2014u2014钻井在自然断裂reservoirs-the短的平衡条件和时间效应的影响

Energies 2010, 3, 1639-1653; doi:10.3390/en3101639 OPEN ACCESS energies ISSN 1996-1073 /journal/energies Review A Simple Analytical Approach to Simulate Underbalanced- drilling in Naturally Fractured Reservoirs—The Effect of Short Overbalanced Conditions and Time Effect Siroos Salimi 1,*, Ali Ghalambor 2, Johan Tronvoll 3 and Knut Inge Andersen 4 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; E-Mail: alig@ 3 Weatherford Petroleum Consultants, Stiklestadveien 1, N-7041 Trondheim, Norway; E-Mail: johan.tronvoll@ 4 Statoil ASA, 4035 Stavanger, Norway; E-Mail: knia@ * Author to whom correspondence should be addressed; E-Mail: siroos@ipt.ntnu.no; Tel.: +47 Fax: +47 Received: 6 September 2010; in revised form: 20 September 2010 / Accepted: 27 September 2010 / Published: 29 September 2010 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 productiv