Enhanced Oil Recovery

 Cross-section illustrating how CO2 and water are often wont to flush resid from a subsurface rock formation between wells. petroleum development and production in U.S. oil reservoirs can include up to 3 distinct phases: primary, secondary, and tertiary (or enhanced) recovery. During primary recovery, the natural pressure of the reservoir or gravity drive oil into the wellbore, combined with artificial lift techniques (such as pumps) which bring the oil to the surface. But only about 10 percent of a reservoir's original oil in situ is usually produced during primary recovery. Secondary recovery techniques extend a field's productive life generally by injecting water or gas to displace oil and drive it to a production wellbore, leading to the recovery of 20 to 40 percent of the first oil in situ .

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