Patent ID: 7506690

Claim:
A method for liquid hydrocarbon recovery from an intermediate to a higher pressure downhole liquid hydrocarbon formation and through a production tubing string in a wellbore, the method comprising: providing a vertical wellbore annulus within an opened liquid hydrocarbon formation, said liquid hydrocarbon formation having solution gas saturated crude oil; providing a production tubing string down the vertical wellbore near or below the opened liquid hydrocarbon formation, with a liquid injector on the bottom of said production tubing string, for preventing gasses from passing into the production tubing string, said liquid injector for producing opened liquid hydrocarbon formation liquid inflow; providing a surface wellhead with a pressure control valve and a pressure gauge for controlling a selected optimum wellbore annulus to open liquid hydrocarbon formation liquid hydrocarbon recovery pressure; producing the opened liquid hydrocarbon formation liquid inflow through said liquid injector into the production tubing string completely on to the surface by wellbore annulus to production tubing string pressure differential alone; and maintaining the opened liquid hydrocarbon formation under controlled optimum wellbore annulus to liquid hydrocarbon formation pressures above that of the in place crude oil's bubble point pressure, with the surface wellhead pressure control valve thereof, through the entire liquid hydrocarbon production and recovery process.