Experimental modelling of a recovery technique for liquid hydrocarbons at saturations lower than the flow threshold from gas-saturated deposits of gas-condensate and oil-gas-condensate fields
This paper presents the results of experimental modelling of a recovery technique for hydrodynamically immobile liquid hydrocarbons (LHC - oil and retrograde condensate) from productive formations of gas-condensate and oil-gas-condensate fi ds (GCFs and OGCFs) - on the example of the main deposit of Vuktyl OGCF. The technique is based on cyclic injection of hydrocarbon solvent and dry gas, with further recovery of remaining LHC and solvent by dry gas or dry gas with slugs of propane-butane fraction.Experiments on core models showed high potential technological effi iency - recovery factors (displacement effi iency) up to0.72 for LHC and 0.99 for the solvent. In combination with developed infrastructure and low current reservoir pressures, these results indicate possible achievementof profi ability of LHC recovery with this technique at Vuktyl OGCF and other GCFs and OGCFs at late development stages, as well as usefulness of further modelling and pilot fi d studies.