Enhanced liquid hydrocarbon recovery by miscible gas injection water drive

摘要

The present invention relates to down structure injected water drive pressure WDP into crude oil, or natural gas formations. In oil formations, for maintaining pressure up structure on in place oil above its existing bubble point, during its recovery. And for miscible gas injection, where strategically located gas injection wells inject miscible gas into oil formations, to enter into solution with in place oil at optimum injection pressure, adding solution gas saturation and pressure, to increase its mobility and fluidity. And for producing solution gas saturated oil and any condensate, into the invention's recovery well's controlled lower wellbore pressure, still above existing bubble point pressure, where these liquid hydrocarbons are pressure injected through the invention's extended float system EFS Liquid Injector DOLI, into the lower pressure tubing, while preventing entry of gas, for total in place oil recovery. In natural gas formations, this water drive pressure WDP maintains in place gas at an optimum recovery rate and pressure above its dew point pressure, during its total in place gas recovery, preventing “condensate blockage”, and all liquid blockage, where gas is flowed dry up the wellbore annulus, while liquids are removed separately through the Liquid Injector into the production tubing, to be plunger lifted to surface with gas lift. The present invention can be applied in many oil & gas reservoirs Worldwide, to recovery total in place oil & gas, notability extending World oil & gas recovery peaks.