Abstract
Exploratory drilling provides the basis for refined estimates of the volume of reservoirs and their potential economic value. If the refined estimates justify further investment, production wells are drilled into the underground reservoirs. With the advance in technology, directional drilling and offshore drilling in addition to traditional drilling are developed. The recovery of petroleum can be primary, secondary and tertiary. Tertiary recovery is also known as enhanced oil recovery (EOR). Three primary techniques for EOR are gas injection, chemical injection and thermal recovery that includes cyclic steam stimulation (Huff and Puff) and steam assisted gravity drainage (SAGD).
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