The successful application of unique structures offshore East Kalimantan, Indonesia has formed a key element in a strategy of aggressive exploration and rapid exploitation of small discoveries in the area. This paper describes the development of the Stacked Template Structure design and the first two installations.

In July 1995 the Scguni Field was discovered with the drilling of the Seguni #1. The discovery well was located 12 km offshore Balikpapan, East Kalimantan, Indonesia, 4 km from the Scpinggan Field in a water depth of 105 ft.

Upon initial consideration the value of the Seguni prospect was enhanced by its shallow water location close to infrastructure offered by mature producing operations.

The size and shape of the prospect was not likely to produce a significant enough discovery to justify development using a conventional wellhead platform. The use of a large diameter driven caisson would not allow the use of a preferred riscrlcss drilling technique. The complexity of the reservoirs in the area and frequent intervention requirements made subsea development unattractive.

With this in mind, a unique Stacked Template Structure (STS) was conceived and designed prior to and during the drilling of the Seguni prospect. The first STS allowed the Seguni Field to be developed and placed on production with a total of four wells only eight months after confirmation of the discovery.

A second STS of slightly modified design was installed in 154 ft of water at another discovery offshore East Kalimantan in May 1996. This STS allowed the first development well to be spudded 34 days after spudding of the exploration well which justified the project

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