Measuring and testing – Borehole or drilling – Fluid flow measuring or fluid analysis
Patent
1996-02-12
1997-10-21
Brock, Michael
Measuring and testing
Borehole or drilling
Fluid flow measuring or fluid analysis
E21B 4700
Patent
active
056798938
ABSTRACT:
A method of determining the corrected oil decline for an oil-producing reservoir is provided. The values of a plurality of variables are determined including the total processing rate for the reservoir at an initial time denoting the beginning of an elapsed production time period, the total processing rate for the reservoir at a first selected time after the initial time, the oil processing rate for the reservoir at the initial time, the cumulative quantity of total fluids produced from the reservoir between the initial time and the first selected time, the oil processing rate for a given oil saturation level of the reservoir at the first selected time, and the ratio of non-oil fluids to oil for all fluids produced from the reservoir at the first selected time. The values of these variables are then employed in a system of equations to calculate the corrected oil processing rate at the first selected time. A second time after the initial time is selected thereafter and the same steps are repeated for this second selected time. The corrected oil processing rate at the first selected time and the corrected oil processing rate at the second selected time are used to define the corrected oil decline for the reservoir.
REFERENCES:
Bradley, Howard B., Petroleum Engineering Handbook, Society of Petroleum Engineers, Second Printing, 1987, pp. 40-26 -40-29.
Fetkovich, M.J. et al., "Useful Concepts for Decline Curve Forecasting, Reserve Estimation, and Analysis", SPE 29628, SPE Technical Conference and Exhibition, Sep. 1994, pp. 217-232.
Brock Michael
Brown Rodney F.
Chevron U.S.A. Inc.
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