Optimizing Production, Increasing Reserves and Resources; Reviving the Potential of Field A in the Niger Delta Basin

Abstract

Field A is a shallow offshore field, located in the Niger Delta Basin. It is a 2-well field which has an Original Oil In Place (OOIP) of 41 MMSTBO, Estimated Ultimate Recovery of 15.9 MMSTBO, cumulative production of about 50 percent of the EUR. Due to recent suboptimal production from a single completion, a redevelopment effort was thereby initiated, aimed at production optimization, improving the robustness of the new drill opportunity queue for the ongoing new drill development campaign, while increasing resources and reserves by leveraging more recent technology for re-evaluating previously underestimated reservoirs in the field. A detailed Reservoir Characterization (RC) and static modelling efforts concluded for 2 prioritized reservoirs indicated a base case estimate of Current Oil In Place (COIP) of 10.0 MMBO and 11.3 MMBO for reservoirs A and B. A non-rig workover (NRWO) and 2 new drills were identified with potential Estimated Ultimate Recovery of about 6.67 MMBO. A pilot well from one of the proposed new drills is aimed at proving up additional up-dip reserves in stacked reservoir intervals. Flat spots, amplitude conformance and structural highs in untested areas present additional resource potential for the field. Early turnover of geophysical results helped in identifying key seismic angle stack to use for interpretation and amplitude analysis. Structural uncertainty away from well control, canyon edge definition in the up-dip limits of the deeper reservoirs, fluid type identification, are key uncertainties and challenges highlighted during this effort. A best practice employed in achieving timely project milestones was by using an iterative workflow approach between the project team members.