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Project AwardMay 1995

Project CompletionMarch 1999

Willbros, in conjunction with PT Pertafennikki Engineering(PFN) and Japan Gas Corporation (JGC), provided detailedengineering, procurement, and construction services for an

acid gas gathering system in South Sumatra. The system totals 212 km(132 miles) of carbon-steel clad pipe, including 6- through 12-inch gasflowlines from four fields in the Corridor Block Production SharingContract, three gathering stations, 12- through 26-inch gas trunklines,a 3-inch condensate trunkline, a 6-inch waterline, and a main gas plant.The project includes 36 km (22 miles) of swamp installation and fourriver crossings.

Willbros installed all production facilities up to an inlet at anexisting sales gas pipeline including detailed design and construction ofthe pipeline, wellhead facilities, flowlines, and trunklines. Constructionand operation of the sales gas pipeline is the responsibility of PGN, theIndonesian gas utility company.

In addition to the facilities described above, the scope of theproject includes utility systems and required infrastructure at thegathering stations and the Gresik gas plant. Major infrastructure workincludes camps at Dayung, Gelam, and the gas plant; a landing on theMangsang River near the gas plant; administration and warehousing

Corridor Block Gas ProjectGulf Resources (Grissik) Ltd.

Indonesia

continued on back

SouthChinaSea

Gelam

Gresik

TengahLetang

Dayung

Singapore

SUMATRA

CHINA

INDONESIA

AUSTRALIA

Trunklines

Flowlines

Central Gas Plant

Gathering Station

facilities at the gas plant; communication systems; and required roadconstruction.

JGC is providing procurement services and design and constructionof the central gas plant and gathering stations. The gathering stationstie in gas from each of the fields, Dayung, Gelam, Letang, and Tengah,for the removal of produced liquids and dehydration of the residuegas. Both the Dayung and Gelam fields flow under their own pressurevia gas trunklines to a central gas plant at Gresik. Free condensateremoved from the Gelam gas flows to the gas plant in a separatecondensate trunkline. The gas is dehydrated at both gathering stationsthrough contact with triethylene glycol. Produced water at Dayungand Gelam is disposed of by downhole injection.

Production from the Letang and Tengah fields flows to a commongas gathering station. There, as at the Dayung and Gelam gatheringstations, the gas is dehydrated through contact with triethylene glycol.The gas streams are then compressed prior to transport via acommon gas trunkline to the Gresik gas plant. Produced water atLetang/Tengah is disposed of through existing Central Ramba facilities.

Produced gas from the three gathering stations and separatedcondensate from Gelam are further processed at the Gresik gas plant.Carbon dioxide, hydrogen sulfide, water, and heavy hydrocarbons areremoved to meet the required sales gas specifications. Hydrocarbonliquids are stabilized to meet produced condensate specifications. Themain process units at the gas plant are inlet separation, membraneCO2 separation, MDEA gas treating, TEG gas dehydration,hydrocarbon dewpoint control, and condensate stabilization.

Design sales production rates are 310 MMscfd of sales gas to thePGN pipeline and 1,700 bpd of stabilized condensate to the existingBajubung pipeline.

The project was completed in March 1999.