講演
頸城CO2-EORプロジェクトのレビュー
2011 年 76 巻 6 号 p. 498-511
詳細
2011 年 76 巻 6 号 p. 498-511
Since 1988, a CO2 tertiary flood project was conducted in Kubiki Oil field, which located in Niigata prefecture facing the Japan Sea.First three years of the project was spent for pre-injection study. Well logs and core analyses were used to predict the residual oil saturation. Bottomhole fluid sample was taken to measure PVT properties and to perform core-flooding test including MMP under reservoir condition. Based on these results, the pilot test was adequately designed. The injector, EOR-1, and the two observation wells, EOR-2 and EOR-3 were drilled.
CO2 injection was commenced in February, 1991 with an inverted four-spot pattern and was continued through to June 1993. The injection rate was 15 ton/day and totally 9,777 tons of CO2 was injected, well log and fluid samples were taken periodically and bottomhole pressure were automatically recorded by the surface readout system. CO2 breakthrough and oil production were observed in all the observation wells. The project was successfully finished and we acquired various knowledge of CO2 EOR through this project.
In this paper we review Kubiki CO2-EOR project and summarize the knowledge.
