Thailand’s national upstream PTTEP as early as next week is set to spud the Mak Yong wildcat offshore Sarawak, part of its 2021 exploration and appraisal drilling campaign in Malaysia that has already come up trumps on several wells.

The Mak Yong-1 exploration well on shallow-water Block SK 438 will be drilled by the Borr Gunnlod, one of two jack-up rigs it has on charter from Norway’s Borr Drilling.

PTTEP last month completed the tight Kulintang-1 probe on the same block before moving Borr Gunnlod to the Pemanis field, part of the operator’s blocks SK 309 and SK 311 phased gas fields development.


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The operator has already had success this year with the Lang Lebah-2 appraisal well on Block SK 410B offshore Sarawak. This appraisal discovered a gas reservoir larger than the initially estimated 2 trillion cubic feet of gas and PTTEP is now working up development plans with the expectation of taking the final investment decision in 2022.

Further success came with the Dokong-1 exploration well on Block SK 417 offshore Sarawak - a high quality sweet gas discovery that revives the Baram shallow clastics play, according to the nation’s host Petronas. A further exploration well will be drilled on this block as part of the 2021 drilling campaign that also involves the jack-up Borr Saga.

PTTEP has an 80% operated interest in both the SK 438 and SK 417 PSCs on behalf of sole partner Malaysian national upstream company Petronas Carigali on 20%.

PTTEP completed its winning trio with the Sirung-1 wildcat on Block SK 405B, also offshore Sarawak, which was completed in March. The Sirung well discovered oil and gas and the Thai company is continuing appraisal well and development planning.

The Sirung-1 well, the first to be drilled on the block, encountered a significant oil and gas column exceeding 100 metres within the Oligocene to Middle Miocene sandstone clastic reservoir.

Other nearby prospects are on the radar for drilling in 2022.

PTTEP has a 59.5% interest in Block SK 405B where its partners are Moeco with 25.5% and Petronas Carigali on 15%.

Future plans

Meanwhile, PTTEP is performing 3D seismic reprocessing of data acquired over Block SK 314A offshore Sarawak and the results will be used to plan two exploration wells next year.

The operator is too studying the petroleum potential and reprocessing 3D seismic of Block PM 407 offshore Peninsular Malaysia. Both these studies are scheduled for completion in the third quarter and will be used to select two wildcats for its 2022 to 2023 drilling campaign.

The operator is also evaluating the remaining petroleum potential of Block PM 415 offshore Peninsular Malaysia after drilling the Jelawai-1, Jelawai-1 ST1 and Bebaru-1 exploration wells.