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Satellite Tree Subsea Completions Permit Marginal Reserves Production Offshore East Kalimantan, Indonesia
The hydrocarbon-bearing sands in the fields offshore East Kalimantan were deposited in a deltaic environment and are complicated by faulting. This faulting results in small accumulations which cannot be economically exploited by conventional means.
Three of these accumulations had been discovered in the Attaka Field in water depths of 160-190 feet. Even though the weather conditions are mild, conventional platforms were ruled out on economic grounds. An alternate method employing subsea completions was found to be economically viable. This subsea system is characterized by its "off-the-shelf" configuration and simplicity. To reduce the possibility of required well workovers, the wells are single string, gravel packed completions.
This project, then, is an example of a subsea completion system being chosen for marginal reserve development based on economic grounds. Additionally, these are the first subsea completions in Indonesia and yielded much information for use in designing, scheduling, and costing similar installations.
The wells were all previously drilled and suspended exploratory wells, and the completion operations were performed from a floating vessel.
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