ARCO UNIT NEAR PRODUCTION AT INDONESIAN GAS/CONDENSATE FIELD

An ARCO unit scheduled completion of final commissioning last month for production facilities in Pagerungan Besar gas/condensate field in Indonesia.

Site of the Atlantic Richfield Bali North Inc. development project is on tiny Pagerungan Besar Island in the Bali Sea, 300 km east of Surabaya, East Java.

Clough Engineering Group, Perth, Western Australia, through its Indonesian subsidiary PT Petrosea, completed its $250 million (Australian') Pagerungan Besar field development contract with Atlantic Richfield last july, as scheduled. Atlantic Richfield holds the field under a production sharing contract with state owned Pertamina.

Atlantic Richfield let the contract in two phases. Phase 1 involved engineering, while Phase 2 covered procurement and construction. Overall, the contract covered engineering and design, procurement, fabrication, shipping, site construction, testing and commissioning of the project.

Initial gas processing involves removal of water and condensate from natural gas produced from two wellsites on the island. Dry gas will move by pipeline under a separate contract to markets in Java. Condensate will be shipped via tankers from the island by Atlantic Richfield.

Establishment of infrastructure was required for the remote project.

PROJECT COMPONENTS

Main scope of the development program handled by Clough and Petrosea included:

A 350 MMcfd capacity gas processing plant made up of two 175 MMcfd trains.
A condensate handling system, including two 75,000 bbl storage tanks, two loading pumps, and a metering system.
A single point tanker mooring system to accommodate tankers as large as 125,000 dwt and a 212 km submarine, weight coated condensate loading line.
Onshore pipelines.
A computerized distributed control system.
A fully equipped airport capable of accommodating Casa 212 and Dash-7 fixed wing aircraft and B212 helicopters.
All utilities, including electrical power generation, fuel storage, water supply, and sewage treatment.
A harbor and causeway.
Satellite communications systems.
All building infrastructure, including office and accommodation units, a workshop/warehouse, stores, fire station, hangar, and control buildings.

The engineering phase of the project, awarded in january 1991, was carried out in Perth with a peak workforce of 40 engineers and 60 drafting personnel working with Atlantic Richfield to complete an engineering optimization study.

The procurement and construction phase, awarded in August 1991, involved several Indonesian locations: a fabrication site at the PT Gunanusa Utama facility, Cilegon, West Java, for the process and utility skid mounted modules; a project office in Jakarta; a project management office at Surabaya, East Java; and the Pagerungan Besar Island project site. Mobilization and construction at the island site began in September 1991.

Fabrication of the process and utility skid mounted modules commenced in January 1992. The completed modules were loaded out and mobilized to Pagerungan Besar Island. All modules had reached the island by February 1993, and the entire hookup operation was completed last March.

The two gas process trains and power distribution systems have been commissioned, and testing of the plant control and safety systems is complete.

The main construction team was demobilized by August 1993 with a small group of personnel remaining - behind to assist Atlantic Richfield with final commissioning.