Patent ID: 8116980

Claim:
A process for testing hydrocarbon wells in order to obtain general information on a reservoir without necessity of producing surface hydrocarbons, comprising the following steps: injecting into the reservoir a suitable liquid or gaseous fluid, compatible with the hydrocarbons of the reservoir and with the formation rock, at a constant flow-rate or with constant flow rate steps, and substantially measuring, in continuous, the flow-rate and injection pressure at the well bottom; closing the well and measuring fall-off data including pressure during the fall-off period; interpreting the measured fall-off data in order to evaluate a reference pressure of fluids in the reservoir (Pav) and the reservoir properties: actual permeability (k), transmissivity (kh), areal heterogeneity or permeability barriers and real Skin factor (S), wherein the real Skin factor (S) is obtained from a total Skin factor (S t ) reduced by a bi-phase Skin factor (S*) due to an interaction of the fluids in the reservoir; and calculating the well productivity.