METHOD OF DETERMINATION BY CENTRIFUGATION OF THE RESIDUAL SATURATION OF A FIRST FLUID IN A POROUS MEDIUM FOLLOWING THE INJECTION OF A SECOND FLUID

摘要

The invention relates to a method for determining the residual saturation of a first fluid in a porous medium upon injection of a second fluid into said porous medium comprising the following steps: a) at least one sample of said porous medium is placed impregnated with said first fluid, in a centrifuge at an effective gravity g * for a centrifugation time t, said second fluid being injected by said centrifuge; b) The residual saturation in the first fluid of said sample is measured by Nuclear Magnetic Resonance or by submerged weighing; c) Steps a) and b) are repeated, varying the value of said effective gravity g *; d) A residual saturation curve of the first fluid of said porous medium on injection of said second fluid is constructed from each residual saturation measured for each value of said tested effective gravity g *. The invention also relates to a method for the enhanced recovery of hydrocarbons in a porous medium, using said method for determining the residual saturation.