Producing petroleum from the underground requires energy and usually some of this required energy comes from the Mother Nature. The hydrocarbon fluids are under pressure because of geological structures. By the nature, the reservoir pressure moves the hydrocarbon in the wellbore to the surface. Additionally, the gas (both soluble gas and free gas) and aquifer (water) in reservoirs under pressure are the driving sources that help move the underground hydrocarbon into to the production tubing and surface.
Today, we will discuss the first reservoir mechanism which is solution gas drive reservoir. When a newly discovered hydrocarbon reservoir is below the bubble point pressure, the gas will be soluble within the oil phase in reservoir. The reservoir pressure decreases as production goes on and this causes emerging and expansion of gas bubbles creating extra energy in the reservoir. These kinds of reservoirs are called as solution gas drive reservoirs.
Crude oil under high pressure may contain large amounts of dissolved gas. When the reservoir pressure is reduced as fluids are withdrawn, gas comes out of the solution and displaces oil from the reservoir to the producing wells. The efficiency of solution gas drive depends on several factors as the amount of gas in solution, the rock and fluid properties and the geological structure of the reservoir.
This reservoir drive mechanism yield quite low oil recovery which is approximately 10-15 % of the original oil in place (OOIP). The oil recovery is quite low because the gas phase is more mobile than the oil phase in the reservoir. Solution gas drive reservoirs are usually good candidates from water-flooding.
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