抄録
Japan Oil Development Company (JODCO) participates in the development of several oil fields in the offshore oil field in Abu Dhabi, through Joint Venture with Abu Dhabi National Oil Company (ADNOC) and other Shareholders.
The subject “A” oil field has carbonate reservoirs, 40 km×30 km closure and has started production since 1967. Peripheral water injection and crestal gas injection have been applied for pressure maintenance since 1972 and 2005 respectively.
Further development studies are ongoing for an increase in recovery and overcoming further pressure decline. Down flank gas injection is considered as one of the most attractive schemes. Therefore, gas injection pilot test has commenced to evaluate the effectiveness of full field down flank gas injection in “A” oil field since 2001.
10 dedicated wells (6 gas injectors, 2 producers and 2 observers) have been drilled in sublayers A, B and C. Line drive gas injection scheme is being tested in sublayers A and B. Five spot gas injection scheme is being tested in sublayer C. Currently long term gas injection test and extensive reservoir surveillance are ongoing. The main criteria for success of the pilot are sweep efficiency (vertical, lateral and microscopic), miscibility, residual oil saturation to gas (Sorg) and impact on the aged facilities.
This report introduces the summary of the pilot test and its reservoir performance to date.
