Single Trip Tubing Conveyed Perforations Across Multi-Lobed DifferentiallyDepleted Reservoir Complexes In A Highly Deviated Well - Challenges,Lessons Learned Best Practices

摘要

This paper demonstrates how 280ft of oil column spread unevenly across multiple and differentially depletedreservoir units separated by shale layers of varying thicknesses in a highly deviated (62 deg.) well wasperforated in a one trip system and how the project cost was minimized by achieving multiple perforations ina single trip whilst retaining capacity to effectively cure losses and mitigating post-perforation well controlrisks. Against the conventional perforation methodology where reservoir units are perforated individually,isolated before carrying out the next perforation in the subsequent reservoir. The one trip system wasdesigned and deployed in one run targeting all the 6 separate carefully selected sand lobes in one run ensuringgood standoff from the contact and zonal isolation behind casing. Successful execution was confirmedwith all the expected physical outcomes which includes pipe vibration, brine loss as well inspection ofthe spent guns. A post perforation noise and production logging also confirmed flow across all plannedperforation intervals. Perforation of a highly deviated well in differentially depleted multi-lobed reservoirspresent significant operational risks. This paper illustrates how one can safely collapse multiple conventionalperforation runs into a single trip with its attendant benefits on cost efficiency, crossflow and well control.This is the first of its kind in a swampy terrain, shallow offshore Niger Delta.