Phased-Development Strategy to Mitigate Subsurface Uncertainties and Risks in Developing a New Gas Field: A Case Study in the ADCO Fields, UAE

Abstract

Abstract In a new field development plan (FDP), it is essential to identify and assess both static and dynamic reservoir uncertainties. Therefore, an integrated field development study was conducted on multilayered, thin, and relatively tight rich gas-condensate reservoirs in one of the Abu Dhabi Company for Onshore Oil Operations (ADCO) fields. The study identified new potential areas where very limited data were available. Therefore, drilling appraisal wells was essential to confirm the potential of these areas, narrow down the uncertainties, and minimize the development risks. The phased field development strategy made it possible to appraise the new identified potential areas before embarking on facility construction and drilling development wells. The phased-development plan consists of two major phases: Phase I •Drill appraisal and development wells onshore and on existing artificial islands. •Drill appraisal and development wells by extension of existing artificial islands. •Collect data, mainly consisting of coring and special core analysis and additional fluid sampling. •Use long-duration tests to assess performance and sustainability of each reservoir. Phase II •Construct new artificial islands in confirmed areas. •Drill development wells on new artificial islands. The phased field development strategy takes advantage of a continually changing and improving reservoir model in addition to accelerating the time of first gas production and project revenue and minimizing the associated development risk.