Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1996-06-11
1998-06-16
Snow, Walter E.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
324325, 16625001, G01L 308, G01L 310, E21B 4700
Patent
active
057676801
ABSTRACT:
Inception of hydrocarbon extraction from a reservoir causes the oil-water interface to warp and cusp toward the extraction gates along a well. This invention proposes time-lapse DC/AC measurements with an array of permanently deployed sensors in order to detect and estimate the change in geometry and proximity of the oil-water interface as a result of production, and therefore as a function of time. The estimation is carried out with a parametric inversion technique whereby the shape of the oil-water interface is assumed to take the form of a three-dimensional surface describable with only a few unknown parameters. A nonlinear optimization technique is used to search for the unknown parameters such that the differences between the measured data and the numerically simulated data are minimized in a least-squares fashion with concomitant hard bound physical constraints on the unknowns. The proposed estimation procedure is robust in the presence of relatively high levels of noise and can therefore be used to anticipate deleterious water breakthroughs, as well as improve the efficiency with which the oil is produced from the reservoir.
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Guo, Boyun and Lee, R.L., "Determination of the Maximum Water-Free Production Rate of a Horizontal Well With Water/Oil/Interface Cresting", SPE 24324, pp. 167-176, 1992.
Bryant Ian
Druskin Vladimir
Fang Sheng
Karakas Metin
Torres-Verdin Carlos
Garrod David
Jeffrey Brigitte L.
Schlumberger Technology Corporation
Smith Keith G. W.
Snow Walter E.
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