Abstract
The chapter introduces and provides a detailed discussion of the various primary recovery mechanisms and their effects on the overall performance of oil reservoirs. It also discusses the basic principles of the material balance equation and other governing relationships that can be used to predict the volumetric performance of oil reservoirs. Each reservoir is composed of a unique combination of geometric form, geological rock properties, fluid characteristics, and primary drive mechanism. Although no two reservoirs are identical in all aspects, they can be grouped according to the primary recovery mechanism by which they produce. It has been observed that each drive mechanism has certain typical performance characteristics in terms of ultimate recovery factor, pressure decline rate, gas-oil ratio and water production. Therefore, the recovery of oil by any of the natural drive mechanisms is called primary recovery. The term refers to the production of hydrocarbons from a reservoir without the use of any process to supplement the natural energy of the reservoir.
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