The Lang Lebah gas field is located in blockSK410B off the coast of Sarawak, Malaysia. Credit: deela dee/
Lang Lebah is one of the biggest gas discoveries off the coast of Malaysia. Credit: PTT Exploration and Production Plc.
PTTEP HKO, KUFPEC Malaysia, and Petronas Carigali signed a production sharing contract for the SK410B block in July 2016. Credit: PTT Exploration and Production Plc.

The Lang Lebah gas field is located in block SK410B, 90km off the coast of Miri, Sarawak, Malaysia.

It is the largest gas discovery near to Malaysia by PTT Exploration and Production Public Company (PTTEP), a wholly owned subsidiary of the Petroleum Authority of Thailand (PTT).

PTTEP operates the SK410B block with a 42.5% interest through its subsidiary PTTEP HK Offshore (HKO).

KUFPEC Malaysia, a subsidiary of Kuwait Foreign Petroleum Exploration (KUFPEC), holds another 42.5% participating interest in the block, while the remaining 15% is held by Petronas Carigali, a wholly owned subsidiary of Malaysia’s national oil company, Petronas.

Front-end engineering and design (FEED) contracts for both onshore and offshore facilities of the Lang Lebah field development were awarded in 2022, with the final investment decision for the project expected during 2023.

The Lang Lebah field is expected to come on stream in 2027 and will produce up to one billion cubic feet (Bcf) of gas per day.

Block SK410B key information

The SK410B block is located in the South China Sea, 80km off the northeastern coast near Sarawak, in Central Luconia province. It spans an area of 1,910km² with water depths ranging from 50m to 100m.

PTTEP HKO, KUFPEC Malaysia and PETRONAS Carigali signed a production-sharing contract for the block in July 2016.

The project partners are primarily targeting the non-associated sour [containing hydrogen sulphide] gas in the Middle Miocene cycle IV/V carbonate reservoirs.

Discovery and gas reserves at Lang Lebah

The Lang Lebah field is estimated to hold five trillion cubic feet (Tcf) of gas in place.

The field was discovered by the Lang Lebah-1RDR2 exploration well, drilled in March 2019 to a total depth of 3,810m. The discovery well encountered 252m of net gas pay in the Middle Miocene carbonate reservoir.

The Lang Lebah-2 appraisal well, drilled in January 2021, confirmed Lang Lebah as one of the biggest gas discoveries in the region.

Drilled to a total depth of 4,320m, the appraisal well encountered more than 600m of proven net gas pay in the carbonate reservoir. The well test demonstrated a flow rate of 50 million cubic feet (Mcf) of non-associated gas a day.

PTTEP also announced a sweet [composed of methane, low amounts of ethane, propane, inert gases and traces of heavier hydrocarbons] gas discovery in block SK410B by drilling the Paprika-1 wildcat well in December 2022. The wildcat well was drilled to a total depth of 3,348m. It encountered gas pay in clastic reservoirs.

Lang Lebah field development plan

A shallow-water gas field is planned, with two jacket-based wellhead platforms, a central processing platform with jackets, a flare platform, two bridges and a 42in trunk line, and a network of intra-field pipelines to connect the wells with the production facility.

FEED activities for the offshore field development began in July 2022 and are expected to be completed in 2023.

Pipeline route and geophysical site surveys, along with the soil-boring investigation for the field development, will be carried out using the Cassandra VI and the Sapura Wira offshore vessels in the first half of 2023.

Lang Lebah onshore gas plant details

The gas output of the field will be treated at an onshore gas plant in the Petchem Industrial Park in Tanjung Kidurong, Bintulu, Sarawak. The treated gas will be transferred to the Petronas Bintulu LNG Complex.

The onshore gas plant will have carbon capture and transportation facilities to extract COfrom the gas stream and compress and export it through a pipeline to the offshore wellhead platform for re-injection into the reservoir.

The Lang Lebah gas plant will be developed as part of the Sarawak integrated sour gas evacuation system to expedite the development of untapped sour gas resources off the coast of Sarawak.

In June 2022, the Sarawak Economic Development Corporation (SEDC) entered a heads of agreement with PTTEP, Sarawak Shell and Petronas for a long-term lease of land for the construction and operation of an onshore plant complex within the Petchem Industrial Park in Bintulu.

Contractors for Lang Lebah

Technip Energies was awarded the FEED contract for the Lang Lebah onshore gas plant in October 2022.

The contractual scope covers the design of the gas plant with provisions for carbon capture, compression and transportation.

Perunding Ranhill Worley, a subsidiary of Malaysia-based project management and engineering consultancy company Ranhill Worley, was awarded the FEED contract for the offshore facilities of the Lang Lebah field in July 2022.