This paper describes how an expandable drilling liner was used to isolate an overpressured gas zone in a well at a depth of over 13700ft. The liner was deployed for a Venezuelan operator in an onshore field. The liner was run below 9-5/8" casing and expanded from 6-5/8" to 9-5/8" thereby retaining hole size and allowing the well to be drilled to TD without a change in the original casing design.

The paper describes the planning involved in preparing the programme and how several new techniques were developed to ensure success in the field. Described in this paper is the selection of under-reaming parameters, development of cement placement techniques for expandable liners, expandable liner burst and collapse calculations and new milling & dressing techniques.

The application of expandable drilling liners to operations in the Asia-Pacific region could be considerable. Several applications have been considered, including offshore Vietnam, Sarawak and offshore Australia. The aim of this paper is to educate the region on the recent improvements that have taken place in other areas.

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