Bison, Iguana and Gajah Puteri (BIG-P) are discovered gas fields on Premier’s operated Natuna Sea Block A and mark the next generation of developments to support Premier’s long term gas contracts into Singapore and Indonesia. The development of BIG-P was sanctioned in 2017 and comprises a three well subsea tie back to existing infrastructure. Development drilling commenced in the second quarter of 2019 with delivery of first gas targeted for the second half of that year. Together these fields are expected to increase gross deliverable reserves to Singapore by around100 Bcf.
Bison, Iguana and Gajah Puteri fields discovery and appraisal
The Gajah Puteri field was discovered by the Gajah Puteri-1 well in 1997.
Further exploration in the block led to the discovery of the Iguana field by the Iguana-1 well, which was drilled by the Trident 17 jack-up rig in April 2000. The well was drilled using slim hole technology, which reduced the overall drilling time and costs.
The Iguana-1 well struck gas in four separate reservoirs of the Arang formation, flowing at the rate of 25mmscf/d during testing.
Gas samples recovered from the field were similar to those of other discoveries made in the surrounding block.
Reserves of the Indonesian gas fields
Bison is estimated to contain 57bcf of gas, while Iguana is estimated to hold 29bcf and Gajah Puteri holds 150bcf, as per the 2009 Certified Gas Reserves reported by Premier.
BIGP development project details
Premier completed the front-end engineering and design (FEED) for the BIGP project in 2016. The fields are planned to be developed via a three-well subsea control system, tied back and remotely controlled from existing production facilities
The Bison and Iguana fields are planned to be tied back to the Pelikan wellhead platform in water depths of 90m, while Gajah Puteri will be tied back to the Naga wellhead platform. Gajah Puteri’s tie-back will be the longest, featuring an overall length of 21km.
Each well of the subsea system will feature a wet gas meter.
Contractors involved
Proserv was contracted to deliver a subsea control system and related equipment for the BIGP project in March 2017.
The company will also supply its Artemis 2G subsea electronics module, as well as wet gas meters. Deliveries are scheduled to commence in May 2018.
S2V Consulting carried out the FEED for the subsea controls and umbilicals required for the development.
Premier has built a dominant position in the Natuna Sea delivering gas into the Singapore under long term gas sales agreements. Premier seeks to backfill these long term contracts by bringing on-stream discovered but undeveloped resource on Natuna Sea Block A.
Premier also holds a 65 per cent operated interest in the Tuna licence where Premier discovered in excess of 100 mmboe in 2014. In addition, Premier has a 40 per cent operated interest in the highly prospective Andaman II licence in the North Sumatra basin which the Group was awarded in 2018.
