Abstract
Two gas fields offshore Sarawak, Malaysia, are characterised by heavily karstified carbonate reservoirs. These reservoirs are typified by significant porosity and permeability heterogeneities such that large fluid loss zones are commonly encountered while drilling the reservoir section. The drilling strategy for the subsea development wells called for the use of a solid drill-in liner as a contingency should major losses be encountered while drilling the reservoir section. This strategy stands opposed to using a pre-drilled liner. The use of a drill-in liner, however, necessitates perforating.
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