The Role of Welltesting in Improving the Productivity from a Thin, Tight, Fractured andThe Role of Well Testing in Improving the Productivity From a Thin, Tight, Fracturedand Compartmentalized Limestone Reservoir

摘要

This paper describes a creative and pragmatic approach thatrnimproved the production from one of the most difficultrnreservoirs in the Bahrain field. The Middle Cretaceous Abrnzone is a thin, tight, highly faulted, and irregularly-fracturedrnlimestone reservoir. The difficulty with this 15 ft, 1 mdrnreservoir has prevented an efficient recovery. The averagernproduction of wells is 15 bopd. This has prompted a detailedrnintegrated study plan to increase the wells' productivity.rnWelltesting was key to understand the reservoir dynamics. Arncomprehensive welltesting campaign revealed a flowrnmechanism controlled by a fracture network. Fracturernmodeling and simulation failed to give clues on how tornimprove the productivity. However, the new approach thatrnlinks transient welltesting and production data with fracturernnetwork indications derived from seismic interpretations hasrnresulted in improving the productivity considerably. This wasrnaccomplished through re-entering old wells and designingrnspecial trajectories to intersect productive open fractures. Thernproductivity was significantly increased to 60 bopd withrnsustained performance.rnThe paper describes in detail our approach and methodologyrnto understand the reservoir and its drive mechanism and tornincrease productivity and recovery starting from analyzingrncore data up to designing special configuration wells. Thernpaper further highlights the pitfalls of the conventionalrnworkflow approach in modeling such difficult reservoirs.