Method of determining the per strata reserve quality of an...

Details Method of determining the per strata reserve quality of an... Method of determining the per strata reserve quality of an...

2007-08-14

2007-08-14

McElheny, Jr., D. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

Reexamination Certificate

active

10515398

ABSTRACT:
The present invention relates to a method of evaluating the hydraulic potential of a porous stratum defined between two depths zlowand zhigh, the method consisting in generating periodic modulation in the rate of flow from the well, in lowering down the well and in activating for a few periods at the depth zlowa measuring PLT sonde, in extracting from the resulting measurements the amplitude ΔQlowof the sinusoidal component of the flow rate modulation relating to one of the imposed periods T, the amplitude ΔPlowof the sinusoidal component of the pressure modulation relating to the same period T, and the phase delay of the pressure sinewave relative to the flow rate sinewave φlow,in determining the responseRlow=Δ⁢⁢PlowΔ⁢⁢Qlow⁢ⅇ-ⅈφlowin raising the sonde to depth zhigh, andin determining the complex responseRhigh=Δ⁢⁢PhighΔ⁢⁢Qlow⁢ⅇ-ⅈ⁢⁢φhighin calculating the complex responseRstratum=Rhigh·RlowRlow-Rhighin postulating a physical model for the stratum by numerically inverting the mathematical formula giving the theoretical complex response, in determining the hydraulic characteristics of the stratum defined by the measured response Rstratum, in calculating the well productivity index IPstratumrelating to the stratum in question, and in deducing therefrom the mean deposit pressure PDin the stratum using the formula:PD=PDH+QstratumIP.

REFERENCES:
patent: 3559476 (1971-02-01), Kuo et al.
patent: 6801857 (2004-10-01), Despax et al.
patent: 2678679 (1993-01-01), None
patent: 2817587 (2002-06-01), None
patent: WO 93/01391 (1993-01-01), None
Copy of International Search Report for PCT/FR03/01507 dated Oct. 9, 2003 (2 pages).

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