How To Enhance the Recovery of Intermediate Components of an Extremely Volatile Oil

摘要

An enhanced recovery process suited to arnhydrocarbon reservoir containing extreme quality crudernoil is presented in the case history. At the initial pressurernand temperature conditions (pi=169 bars and ti= 92 °C),rnthe oil reservoir volume factor is: Boi=3.94 m3/m3, therndissolved gas content: Rsi=712 m3/m3 and the specificrngravity of the crude only r =0.728 t/m3 (63 API).rnThe reservoir has been produced since 1984 andrnEo= 37 % recovery has been reached, while thernpressure has declined only by 5 % because of the activernwater drive. The further production strategy wasrnelaborated with a 3-D, full field composition simulator byrnan integrated team between 1996-98.rnThe forecast calculations show that Eo=48 % finalrnrecovery can be reached for the individual componentsrnin the reservoir with strong water drive. For furtherrnrecovery enhancement, the best dissolved - both fromrntechnological and technical aspects - seemed to be a dryrngas injection process which would cause 10-13%rnadditional recovery in the C3-C6 components of the crudernoil.