Hydrocarbon well test method

Details Hydrocarbon well test method Hydrocarbon well test method

G - Physics

01

N

73/124, 354/30

G01N 11/00 (2006.01) E21B 49/00 (2006.01)

Patent

CA 1259819

PATENT HYDROCARBON WELL TEST METHOD Inventors: MM. J. AYOUB and D. BOURDET ABSTRACT OF THE DISCLOSURE The invention relates to a well test method for de- termining 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 tp of the order of a few minutes) so as to obtain a flow pulse re- sembling 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 PD and its derivative P'D with respect to time, by matching the branch of the experimental curve corresponding to the short period with a curve PD and the branch of this curve corresponding to the subsequent period with the curve P'D of the same parameter. (Figure 4)

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