A Cost-Effective Solution With Single Trip Multiple Production Packers For Selective Shallow Zones at Sisi Nubi, Mahakam Field

Abstract

Developing marginal fields or extending the life of mature fields becomes significantly more interested when technology is available that can enhance cost efficiency and reduce operational and environmental risks. To support the above needs, a major oilfield equipment supplier has introduced an intervention less technique for setting production packers downhole that provides an alternative to conventional zonal isolation which commonly lead to highly intervention cost.

Production carried out in typical multiple thick reservoir at shallow sections have the economic problem of selective cement cost in offshore environment. A method of reducing this cost is to install multiple packers to isolate interest zones and eliminate the zonal isolation with costly high cost of conventional annular cementing isolation typically in the marginal reserves that currently being available and interested at Pertamina Hulu Mahakam. Gas production has been forecasted in as many as three intervals selectively by the use of multiple packers above the three main gravel pack and no necessary annular cement isolation so then direct perforation could be executed to access the reservoir. This method has the advantage of eliminate annular cementing process and reduce the intervention operation cost prior to well cleanup without incurring the expense of conventional coil tubing zonal isolation.

This alternative solution is the main driving factor as a new way to install selective shallow reservoir and enables the delivery of typical marginal wells economically at the Mahakam Delta swamp area. This has resulted in potential significant well cost saving up to 82% compared to conventional annular zonal isolation.

Post upper completion operation, all packers pressure tested for integrity test and the packers has no pressure from both annular and string through punched tubing between packers. This new frontier solution can be considered as the first successful of multiple packers installation at offshore areas worldwide with no NPT and safety issue.