Long core physical simulation for CO2 flooding in low permeability reservoir Online publication date: Sat, 29-Nov-2014
by Fangfang Li; Shenglai Yang; Hao Chen; Xing Zhang; Xiangrong Nie; Jingchen Ding; Aiai Zheng
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 8, No. 3, 2014
Abstract: CO2 flooding is a proven great method to be used for enhancing injection capacity and increasing oil production in low permeability reservoir. In this paper, based on the natural cores and crude oil of Jilin oilfield, three sets of long core tests were conducted to study oil recovery, GOR and pressure variations during water flooding and CO2 flooding. The performance of advanced CO2 injection, simultaneous CO2 injection and water injection were compared to optimise injection opportunity and injection pattern for low permeability reservoir. Results indicate that advanced CO2 injection is better in maintaining reservoir pressure and improving displacement efficiency. It is considered that advanced CO2 injection before oil production supply valuable opportunity for CO2 to fully contact with oil which could help decrease oil viscosity and interfacial tension, swell oil volume and increase injection rate effectively. [Received: April 23, 2013; Accepted: December 24, 2013].
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