G - Physics – 06 – G
Patent
G - Physics
06
G
354/1
G06G 7/48 (2006.01) E21B 49/00 (2006.01)
Patent
CA 1209699
PATENT METHOD FOR DETERMINING THE CHARACTERISTICS OF A FLUID-PRODUCING UNDERGROUND FORMATION Invention of Dominique Bourdet and Timothy Whittle ETUDES ET FABRICATIONS FLOPETROL ABSTRACT OF THE DISCLOSURE Disclosed is a method for determining the physical character- istics of a system made up of a well and an underground formation containing a fluid and communicating with the well. A change in the rate of flow of the fluid is produced and a measurement is made of a parameter characteristic of the pressure P of the fluid at successive time intervals .DELTA. t. One then compares - on the one hand, the theoretical evolution of the logarithm of the derivative P'D of the dimensionless pressure as a func- tion of the logarithm of tD/CD, the derivative P'D being with respect to tD/CD, tD representing the dimension- less time and CD the wellbore storage (compression or decom- pression) effect, with - on the other hand, the experimental evolution of the loga- rithm of the derivative .DELTA. P' of the pressure as a function of the logarithm of the corresponding time intervals .DELTA. t, the derivative .DELTA. P' being with respect to time t. One then determines, from the comparison of said theoretical and experimental evolutions, the product kh of the permeability k by the thickness of said forma- tion h, and the coefficient C. Figure 3.
451272
Bourdet Dominique
Whittle Timothy
Schlumberger Canada Limited
Smart & Biggar
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