Fremgangsmåte for evaluering av fysiske parametere til et undergrunnsreservoar fra borekaks tatt derfra

摘要

- system for evaluating physical parameters such as the absolute permeability of porous rocks in a zone of an underground, on the basis of the fragments collected in this zone, such as rock debris raised in the sludge drilling. - of the rock fragments (f) are immersed in a viscous fluid contained in an enclosure (1). The pumping means (2, 3) injecting first of all in the enclosure (1) of the fluid under a pressure which increases with time, up to a predetermined pressure threshold, so as to compress the gas trapped in the pores of the rock. This injection phase is followed by a relaxation phase with the stopping of the injection. The variation of pressure measured by sensors (7, 8) for these two successive phases is recorded by a computer (9). The evolution of the pressure during the injection process, having been modelled from initial values selected for the physical parameters of the computer the iteratively adjusted so as to coincide, at best, the pressure curve modelled with the pressure curve actually measured. - applications petrophysical measurements.