It is one of the most common natural drive mechanism present in many oil and gas reservoir. Water bodies or aquifer below or around a reserve exert a force on it. When a well is drilled into the reservoir and opened to the atmosphere (or lower pressure), oil or gas starts flowing naturally to the surface at considerable pressure due to the force exerted by the aquifer.
In such reservoir, pressure is maintained even after a large quantity of fluid is produced. Therefore, the recovery efficiency or recovery factor can go up to 40-50%. However, if proper reservoir management is not followed, water cut may increase considerably and lower the recovery.
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