Publications
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Fayers FJ, Muggeridge AH, 1990, Extensions to dietz theory and behavior of gravity tongues in slightly tilted reservoirs, SPE Reservoir Engineering (Society of Petroleum Engineers), Vol: 5, Pages: 487-494, ISSN: 0885-9248
This paper investigates accuracy implications in the modeling of unstable gravity tongues in slightly tilted, anisotropic reservoirs. An extended form of Dietz's equation is examined and its range of validity established by reference to high-resolution simulation. The theory is also used to investigate the onset of viscous fingering with a new viscous-to-gravity number.
Christie MA, Jones ADW, Muggeridge AH, 1990, Comparison between laboratory experiments and detailed simulations of unstable miscible displacement influenced by gravity, North Sea oil and gas reservoirs - II, Pages: 245-250
This paper presents a study of oil displacement by a less-dense, less-viscous solvent. A comparison is made between laboratory observations and high-resolution simulations in order to test the predictive capability of the numerical model. Observations are made of linear displacement in a Ballotini pack with the principal flow at right angles to the direction of gravity. Flow is visualized using a dye tracer and recorded on video; subsequent image processing of the video film enables the concentration distribution to be determined for any chosen time. The effluent is analysed by colorimetry. The numerical model used to simulate the experiment has a simplified physical description (two-dimensional displacement of oil and solvent). High-order finite-difference techniques in conjunction with extremely fine grids provide detailed resolution of the flow. -from Authors
CHRISTIE MA, JONES ADW, MUGGERIDGE AH, 1990, COMPARISON BETWEEN LABORATORY EXPERIMENTS AND DETAILED SIMULATIONS OF UNSTABLE MISCIBLE DISPLACEMENT INFLUENCED BY GRAVITY, 2ND NORTH SEA OIL AND GAS RESERVOIRS CONF, Publisher: GRAHAM & TROTMAN LTD, Pages: 245-+
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BARLEY JJ, CHRISTIE MA, MUGGERIDGE AH, 1990, HIGH-RESOLUTION SIMULATION OF MULTIDIMENSIONAL VISCOUS FINGERING, 5TH INTERNATIONAL CONF ON SCIENCE AND ENGINEERING ON SUPERCOMPUTERS, Publisher: COMPUTATIONAL MECHANICS PUBLICATIONS LTD, Pages: 233-241
Fayers FJ, Muggeridge AH, 1989, Extension to Dietz theory and behavior of gravity tongues in slightly tilted reservoirs
This paper investigates the simulation of segregated flow in slightly tilted reservoirs. The displacement can be modelled by tracking the motion of the interface using the Dietz equation (1959). However the original Dietz equation cannot describe the interface motion in stable displacements, nor is it accurate when the bed is slightly tilted. It is shown that an extended equation, originally derived by Sheldon and Fayers (1962), improves prediction in both stable and unstable displacements. The limits of accuracy of the extended method are established using a high resolution simulation method described by Christie (1987). Finally the stability of the interface to the onset of viscous fingering is examined. A new dimensionless number NG is defined which measures the ratio of gravity to viscous forces in a tilted bed.
Fayers FJ, Muggeridge AH, 1989, Extension to Dietz theory and behavior of gravity tongues in slightly tilted reservoirs.
The original form of the Dietz equation was not capable of describing the motion of the interface in the simulation of segregated flow in slightly tilted reservoirs. An extended version improved prediction, and its accuracy limits were established using a high resolution simulation method. The stability of the interface to the onset of viscous fingering was examined. A new dimensionless measurement of the ratio of gravity to viscous forces in a tilted bed was defined.
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