A Method Of Predicting The Future Reservoir Performance Of A Gas Reservoir Using A Digital Computer

10.2118/28-ms ◽  
1961 ◽  
Author(s):  
Forrest A. Garb
Keyword(s):  
Digital Computer ◽  
Gas Reservoir ◽  
Reservoir Performance ◽  
The Future

Fractured Gas-Reservoir Performance

2007 ◽  
Vol 46 (12) ◽  
Author(s):  
F.B. Thomas ◽  
D.B. Bennion
Keyword(s):  
Gas Reservoir ◽  
Reservoir Performance

A Numerical Solution to the Unsteady-State Partial-Water-Drive Reservoir Performance Problem

1961 ◽  
Vol 1 (03) ◽  
pp. 184-194
Author(s):  
Walter L. Henson ◽  
Paul L. Wearden ◽  
John D. Rice
Keyword(s):  
Digital Computer ◽  
Analogue Computer ◽  
Reservoir Pressure ◽  
Unsteady State ◽  
Aquifer Parameters ◽  
Pressure Behavior ◽  
Reservoir Performance ◽  
Performance Problem ◽  
Partial Water ◽  
Digital Computers

Abstract Solutions to the unsteady-state partial water-drive reservoir performance problem can be obtained through the use of analogue computers or high-speed electronic digital computers. The solutions that have previously been resolved for use on digital computers, however, demand a knowledge of the aquifer parameters. Generally, the analogue computers now in use do not require this knowledge. A solution is presented herein where the aquifer performance, expressed in terms of difference equations, is related to the reservoir performance as expressed by the modified Schilthuis material-balance equation. A numerical procedure for a medium-sized digital computer also is presented in which a solution to the set of equations defining the aquifer and reservoir performance is obtained and the aquifer parameters (permeability and sand thickness) are automatically optimized while simultaneously matching the known pressure behavior. Predicted pressure behavior can be calculated using rates from any assumed future production practice. The procedure provides an output format which presents the cumulative, incremental and average rate of natural water influx, the per cent gas-cap expansion, the calculated reservoir pressure, the measured reservoir pressure, and the difference between the measured and calculated pressures. Results of a test problem are presented in comparison with results obtained by the Bruce Analyzer, Ohio Oil Co.'s Pace General Purpose Analogue Computer, and Sun Oil Co.'s Single-Pool Electronic Reservoir Analyzer. These results indicate that unsteady-state reservoir performance for a single-pool system can be adequately simulated by a numerical method employing a digital computer and that the special-purpose analogue computer can be supplanted by this method.

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