Performance Evaluation of a Reservoir Under EOR Recovery: Intisar ‘D’ Reef, Concession 103, Libya

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe Intisar 'D' reservoir is a carbonate reef of Paleocene origin with no appreciable flow barrier. This is an under saturated reservoir with an oil of 40 °API and solution gas oil ratio of 595 SCF/STB. The reservoir, having 452 ft of net pay, is at a datum of 9,000 ftSS with an initial OOIP of 1.76 billion stock tank barrels and initial reservoir pressure of 4,257 psia. A series of very successful reservoir management strategies have been applied in order to optimize and increase the production capacity and reserves. So far 69.2 % (1.2 MMSTB) of OOIP has been recovered mainly due to implementation of an EOR project.cumulative oil production was 1,218 MMSTB, of which 823 MMSTB were driven due to gas injection as secondary and tertiary recovery methods while 395 MMSTB were produced due to waterflooding. This is one of the biggest EOR processes worldwide. This paper discusses the strategy used to produce this reservoir and also to compute the produced oil recovery from the different drive mechanism employed.

Modifying the Libyan fiscal regime to optimise its oil reserves and attract more foreign capital part 2: application to CO2‐EOR project in Libya

“…Based on the experience of one of the world's largest hydrocarbon miscible projects at the Intisar ‘103 D Reef’, Libya has started building a database for the largest national program of EOR. Intisar ‘103 D Reef’ has a total RF about 70 per cent of the OOIP (DesBrisay and Daniel, ; Arifi, ; Vilela et al ., ). Recently, the LNOC wanted to expand their production capacity by taking the benefits of the available technology and by applying the EOR methods to increase the RF of the Libyan oil reservoirs beyond the conventional methods (Egbogah et al ., ; Arab Petroleum Research Centre, ).…”

Hydrocarbon Gas Flooding Optimization considering Complex Fracture Networks through Numerical Simulation in the Tight Oil Reservoirs

“…The results show that hydrocarbon gas flooding can effectively improve oil recovery. Vilela et al [32] analyzed the influence of gas injection pressure on oil recovery for the reservoir. Yu et al [29] used laboratory experimental methods to evaluate the feasibility of gas injection after water injection in the tight oil reservoir and analyzed the influence of gas injection rate on the effect of gas injection and oil displacement.…”