Angsi

Angsi Oil and Gas Field Profile

Location

The Angsi Oil and Gas Field is located approximately 100 miles (or 160 kilometers) offshore of Terengganu, Malaysia, in the South China Sea, within the PM 305 block.

Operator and Ownership

The field is operated by Petronas Carigali Sdn. Bhd., a subsidiary of the Malaysian national oil company Petronas. The working interests are shared 50/50 between Petronas Carigali and ExxonMobil Exploration & Production Malaysia Inc..

Discovery and Production

The Angsi field was discovered in 1974. The first production started in 2001, following the completion of the first phase of development.

Field Development

• Phase I: Included the design, fabrication, and installation of a drilling and riser platform (AnDR-A), modifications to the Guntong D platform, and modifications to the Jerneh onshore slug-catcher in Kertih. This phase also involved the installation of 222 km of interconnecting gas pipelines.
• Phase II: Consisted of the design, fabrication, and installation of a central processing platform (AnPG-A) and a drilling platform (AnDP-B), along with a 48-km crude export pipeline to the existing Tapis pump platform.
• Phase III and Later Phases: Additional platforms, including AnDP-C, AnDP-E, and AnDP-D, were added as part of the ongoing development of the Angsi complex.

Infrastructure

• The Angsi complex includes a central processing platform (AnPG-A) connected by a bridge to a 52 well drilling platform (AnDR-A) and a second satellite platform (AnDP-B) with a 32 well capacity.
• Over 190 miles of pipelines were installed, connecting the field to production facilities at Guntong D, Seligi A, Tapis, and a 105 mile-long pipeline to the Kertih Gas Processing Plants onshore.
• The field serves as a hub for transporting gas to shore from other developments, including the Berantai Gas Field.

Production and Reserves

• Production Volume: The field produces hydrocarbons at a rate of approximately 10.8 million barrels of oil equivalent per year (boe/y) as of 2022.
• Reserves: The remaining recoverable reserves are estimated at 19.91 million barrels of crude oil and condensate, and 2922.55 million cubic meters of gas as of 2023.

Contractors and Services

• Various contractors have been involved in the development, including MMCOG for front-end engineering design services, TL Offshore for pipeline installation, Ramunia Fabricator for platform fabrication and hook-up, and TH Heavy Engineering for topsides construction.

Chemical Enhanced Oil Recovery (CEOR) Project

• Petronas and ExxonMobil have been investigating solutions to maintain plateau production and expand the lifespan of the Angsi field since 2012. Initially, a CEOR vessel concept was considered, but due to cost and logistical issues, the project is being re-designed to use an onshore treatment plant in Terengganu. This involves transporting the chemical mixture through a subsea pipeline.

Geology and Water Depth

• The field is located in shallow water, with a water depth of approximately 308 feet.

Economic and Operational Significance

• The Angsi field is a strategic asset for Petronas, contributing significantly to Malaysia's oil and gas production. The field's production accounts for a portion of the country's daily output, and it is expected to continue production until it reaches its economic limit.

Future Plans

• The ongoing CEOR project aims to boost the recovery rate from the current 30-40% to around 50%. This involves deploying advanced recovery techniques, including the use of alkali-surfactants-polymers (ASP) diluted in soft water.

In summary, the Angsi Oil and Gas Field is a major integrated oil and gas facility in Malaysia, operated by Petronas with ExxonMobil as a partner. It has been in production since 2001 and continues to be a significant contributor to Malaysia's energy sector.