METHOD FOR HYDROCARBON WELL TESTING

摘要

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 tP 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 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.