Project Profile
Location: Offshore Terengganu, South China Sea, Malaysia
Production: 65,000 b/d of oil and 450 MMscfd of gas
Length: 166 km (pipeline from the Angsi complex to the onshore receiving facility)
The Angsi field is located in the offshore Terengganu, Malaysia. At the end of 2004, Talisman had booked 29 MMbbl of reserves at South Angsi, based on Talisman working interest before royalties. Talisman Malaysia Ltd. is the operator and holds a 60% interest in Blocks PM-305 and PM-314. The remaining 40% interest is held by Petronas Carigali Sdn. Bhd. Petronas Carigali Sdn, began first production from Angsi field in the South China Sea off Malaysia, 6 months ahead of schedule and 30% below original approved cost. Angsi\'s initial flow was 15,000 b/d of oil and 60 MMscfd of gas. At peak, Angsi should produce 65,000 b/d of oil and 450 MMscfd of gas (10% of Malaysia\'s current oil production and 17% of its current gas production, respectively). An integrated oil and gas central processing platform is connected to a 52 well drilling platform via a 100m bridge, as well as a 32 well satellite drilling platform. There are connections to existing gas production facilities at Guntong-D and Seligi-A, a connection to the existing oil production facilities at Tapis, and a new 166-km pipeline from the Angsi complex to the onshore receiving facility.
The field was identified as the candidate for the pilot project to evaluate the effectiveness of the Alkaline Surfactant (AS) process in improving oil ultimate recovery through the reduction of residual oil saturation. The pilot project entails the injection of AS chemical into Angsi I-68 reservoir and will use a Single Well Tracer Test (SWCT) to determine the residual oil saturation in water-flooded area. This is the first chemical Enhanced Oil Recovery (EOR) pilot project in Malaysia and the results are crucial to support the decision making for a future full field and AS technology implementation in Malaysia.
CEOR pilot project was proposed and implemented at Angsi I-68 reservoir to evaluate the effectiveness of the AS process at reservoir condition in improving oil ultimate recovery through the reduction of residual oil saturation, Sor. The AS technology combines synergistically, the interfacial tension reducing effect of added surfactants and those produced in the acidic crude oil by alkaline reaction of organic acids. AS flooding shows promise of being cost-effective because alkali, in addition to reinforcing the activity of surfactants, reduces the depletion of surfactant that occurs due to adsorption/retention in the reservoir 2-3. The Angsi CEOR pilot project marked a significant milestone for the Malaysian oil and gas industry as it was the first CEOR project implementation in the country. The results of this pilot project are crucial in the future decision making for a large-scale full field and AS technology implementation with reduced technical risk. The result may be one of the keys in deciding the fate of the CEOR implementation in the Malaysian oilfields. In implementing this pilot project, together the team tackled and overcame significant technical and operational challenges.
Operators:
Petronas Carigali Sdn. Bhd: Operator with 50% interest
ExxonMobil: 50% interest
Contractors:
MMC Oil & Gas Engineering: FEED contract