Transient pressure behavior of Commingled reservoirs

Journal Article · Fri Mar 01 04:00:00 EST 1991 · SPE Formation Evaluation (Society of Petroleum Engineers); (United States)

DOI:https://doi.org/10.2118/18125-PA· OSTI ID:5849033

Kuchuk, F J; Wilkinson, D J ^[1]

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1. Schlumberger-Doll Research Center, Ridgefield, CT (United States)

This paper presents a new general analytic formulation for pressure-transient behavior of commingled systems (layered reservoirs without crossflow). The formulation includes the effects of surface and downhole flow-rate variations and of wellbore storage resulting from the wellbore volume's location below the flow-rate measuring point (at any location in the wellbore, including the surface and sandface). The method can be applied to a variety of layered reservoirs. Each individual subzone (reservoir) in the system can be different, with different initial and outer-boundary conditions, and each zone can start to produce at a different time. The well completion for each layer can also be different. New Laplace-domain solutions are presented for partially penetrating slanted wells and partially penetrated wells with and without a gas cap. The solution for slanted wells is based on that of Cinco-Ley et al. but includes the correct effective wellbore radius for the case of an anisotropic formation. Solutions to a few selected commingled systems are also presented to explore the application of the formulation.

• OSTI ID: 5849033
• Journal Information: SPE Formation Evaluation (Society of Petroleum Engineers); (United States), Journal Name: SPE Formation Evaluation (Society of Petroleum Engineers); (United States) Vol. 6:1; ISSN 0885-923X; ISSN SFEVE
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
020300 -- Petroleum-- Drilling & Production
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ANISOTROPY
FLOW RATE
INTEGRAL TRANSFORMATIONS
LAPLACE TRANSFORMATION
OIL WELLS
PRESSURE GRADIENTS
RESERVOIR ROCK
ROCK-FLUID INTERACTIONS
TRANSFORMATIONS
VARIATIONS
WELL COMPLETION
WELLS