The PFLNG 1 is to be commissioned at the Kanowit field in late 2015.
Subsea7's Rockwater 2 vessel assisted in the SURF installation works for the project.
Aker Solutions provided 5,600m of subsea umbilicals for the Kanowit field. Image courtesy of Aker Solutions.


The Kumang Cluster Development Phase 1 involved the development of the Kumang, F9 and Kanowit gas fields.

Kumang Cluster, located 200km offshore Bintulu, Sarawak, is operated by PETRONAS Carigali and consists of 10 gas fields located at water depths ranging from 60m to 100m.

The remaining seven gas fields, namely A3, F11, F22, F27, F12, Selar Marine and Bunga Pelaga, will be developed in Kumang Cluster Development Phase 2.

The first gas production from the project was in 2011, and the export facilities are designed to convey 550 million cubic feet of gas per day and 22,000 barrels per day of condensate.

“Petronas is currently constructing a floating liquefied natural gas facility (PFLNG 1), which will be installed at the Kanowit gas field.”

Petronas is currently constructing a floating liquefied natural gas facility (PFLNG 1), which will be installed at the Kanowit gas field. The facility will be capable of producing 1.2 million tonnes of LNG per year, starting from 2015, and will be the first of its kind in the world.

Discovery and geology of Kanowit gas field

The Kanowit gas field, within the Kumang Cluster located offshore of Sarawak, was discovered in 2005 by drilling the Kanowit-1 exploration well using the semi-submersible rig Naga-1. The gas reservoir is located within the Miocene limestones.

Phase 1 development details

The development of the fields under Phase 1 included the installation of a central processing platform (CPP), F9KG-A, a wellhead KAJT-A at Kanowit, F9JT-A wellhead at F9 and KUJT-A wellhead at Kumang.

The F9KG-A CPP is equipped with a condensate / gas separation system, gas compression system, gas dehydration system, telecommunication system, power generation system, compact manifolds, metering system and a helipad. The F9JT-A wellhead is bridged linked to the CPP.

However, the KUJT-A and KAJT-A wellheads are equipped with minimum basic facilities such as compact manifolds, small-scale power generation facilities, telecommunication and helipads. The two wellheads are located 70km and 50km from the CPP respectively.

The project involved the drilling of 23 production wells. Gas produced from the three fields is transported to the PETRONAS LNG Complex in Bintulu via a pipeline.

Details of PFLNG 1

The construction of the PFLNG 1 began in June 2013 with the cutting of the first steel, and its keel was laid in January 2014. The front-end engineering design (FEED) work for the facility was carried out by Technip and Daewoo Shipbuilding & Marine Engineering (DSME). Construction is being carried out at DSME’s shipyard in Okpo, South Korea.

“The facility measures 365m in length and 60m in width, and weighs approximately 125,000t at full capacity.”

The PFLNG 1 will use Air Products’ AP-NTM LNG process and equipment and Honeywell’s UOP Amine Guard FS process to remove carbon dioxide and hydrogen sulphide from the liquefied natural gas feed streams.

The facility measures 365m in length and 60m in width, and weighs approximately 125,000t at full capacity. It will be capable of storing 180,000m³ of LNG.

Contractors involved with the Malaysian offshore project

FEED activities for the project were carried out by Ranhill-WorleyParsons, while conceptual design and engineering services were performed by MMC Oil & Gas Engineering.

The contracts for the topsides and jackets of the platforms were awarded to Sime Darby Engineering, Ramunia Fabricators and Oilfab. Ramunia Fabricators was also involved in the construction of the KUJT-A jacket and Kanowit CPP jacket.

The engineering, procurement and construction (EPC) contract for Kanowit field’s subsea production system, consisting of two subsea trees, wellheads, subsea control system, manifold with high-integrity pressure protection system, pipeline-end manifold and tie-in equipment, was awarded to Aker Process Systems Asia Pacific (APSAP). The same company also supplied 5,600m of subsea umbilicals for tying back the Kanowit subsea wells to the CPP.

Subsea7 provided installation assistance for the subsea umbilicals, risers and flowlines (SURF). Certain pipe installation works carried out by Leighton Offshore, and Topaz Integrated Technology supplied fuel gas-heater control panels.

NRI Energy Technology