Summary

To meet the need to reduce monobore tubingless completion costs, a combination device to hang a liner, seal the liner top, and perform completion-packer functions with a compact single unit has been developed. This combination system improved the economic feasibility of the Kuparuk River field monobore project in Alaska. This paper describes the system, discusses the benefit for a singletrip completion, presents test results, and addresses the running procedures for the single-trip multipurpose packer.

Field Justification

Conventional wells in Kuparuk use 9 5/8-in. surface casing and 7-in. production casing. In 1994, the Kuparuk River Unit Well Cost- Reduction Study Team identified a step-function design change for injection wells in Kuparuk. The change for injectors reduced the wellbore size to a 7 5/8-in. surface casing and a 4 1/2-in. production casing, while eliminating standard production tubing. The full results of that study are outlined by Pearson et al.1 The overall intent of the Cost-Reduction Study Team was to identify areas to reduce the 1993 well cost by 30%.

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