Measuring and testing – Borehole or drilling – Downhole test
Patent
1985-08-19
1987-07-07
Levy, Stewart J.
Measuring and testing
Borehole or drilling
Downhole test
E21B 4900
Patent
active
046778497
ABSTRACT:
The invention relates to a well test method for determining the physical characteristics of a system made up of a well and a subsurface formation containing a fluid such as a hydrocarbon. A change in the flow rate of said fluid is produced for a short period (duration t.sub.P of the order of a few minutes) so as to obtain a flow pulse resembling a Dirac pulse; the variations .DELTA.P of the down-hole fluid pressure is measured during said short period and then during the subsequent period of return to the initial state of the well-formation system, and the experimental pressure curve thus obtained is compared with the curves of a double network of type curves representing, as a function of a common parameter, the pressure P.sub.D and its derivative P'.sub.D with respect to time, by matching the branch of the experimental curve corresponding to the short period with a curve P.sub.D and the branch of this curve corresponding to the subsequent period with the curve P'.sub.D of the same parameter.
REFERENCES:
patent: 3321965 (1967-05-01), Johnson et al.
patent: 3550445 (1970-12-01), Kiel
patent: 3636762 (1972-01-01), Kuo et al.
patent: 4328705 (1982-05-01), Gringarten
patent: 4597290 (1986-07-01), Bourdet et al.
patent: 4607524 (1986-08-01), Gringarten
World Oil, vol. 196, No. 6, pp. 95-106, May 1983, D. Bourdet, etc.
Ayoub Joseph
Bourdet Dominique
Levy Stewart J.
Oldham Scott M.
Schlumberger Technology Corporation
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