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Results
Chemical EOR Pilot in Mangala Field: Results of Initial Polymer Flood Phase
Pandey, Amitabh (Cairn Energy India Pty Limited) | Kumar, M. Suresh (Cairn Energy India Pty Limited) | Jha, Manish Kumar (Cairn Energy India Pty Limited) | Tandon, Rohit (Cairn Energy India Pty Limited) | Punnapully, Brennan S (Cairn Energy India Pty Limited) | Kalugin, Mavriky (Cairn Energy India Pty Limited) | Khare, Ashish (Cairn Energy India Pty Limited) | Beliveau, Dennis (Cairn Energy India Pty Limited)
Abstract The Mangala field in the Rajasthan state of western India was the first major oil discovery in the Barmer Basin. It contains over 1 billion bbls of paraffinic oil with average viscosity of ~15cp and wax appearance temperature only ~5ยฐC less than reservoir temperature. The initial development plan is a hot waterflood to prevent in situ wax deposition; however, chemical EOR methods are expected to play an important role in the ultimate field development strategy. EOR assessment was part of the initial field development planning process. Screening studies were conducted soon after discovery followed by comprehensive laboratory evaluations of chemical flood potential which had been identified as the most suitable process. The laboratory evaluation along with parametric simulation studies indicated significant chemical EOR potential. A closely spaced normal 5-spot pilot was designed to test chemical EOR processes in the early part of the field development. Logging observation wells are strategically placed in the pilot to periodically monitor changes in oil saturation. The initial waterflood phase in the pilot has been completed and injection of the polymer slug is in progress. Comprehensive monitoring and quality control procedures are being followed to ensure smooth operations. Extensive PLTs, time-lapse saturation and resistivity logs, pressure surveys, tracer surveys, detailed produced fluid analyses and tests for monitoring the quality of injected fluids are all performed routinely. Dynamic reservoir modeling has been a critical part of the analysis to understand polymer flood behavior. The initial polymer flood phase in the pilot will be followed by ASP (alkaline-surfactant-polymer) injection for further evaluation of chemical EOR potential. This paper discusses the operational aspects of polymer flood facilities, quality control and monitoring program followed, challenges faced, polymer injection results and plans for future ASP injection.
- Asia > India > Rajasthan > Rajasthan Basin > Barmer Basin > Rajasthan Block > Mangala Field > Fatehgarh Formation (0.99)
- Asia > India > Rajasthan > Rajasthan Basin > Barmer Basin > Rajasthan Block > Mangala Field > Barmer Hill Formation (0.99)
- Asia > India > Rajasthan > Rajasthan Basin > Barmer Basin > Block RJ/ON-90/1 > Mangala Field > Fatehgarh Formation (0.99)
- Asia > India > Rajasthan > Rajasthan Basin > Barmer Basin > Block RJ/ON-90/1 > Mangala Field > Barmer Hill Formation (0.99)
Abstract The Mangala Field is the largest discovered oil field in Barmer Basin, Rajasthan, India. The field contains medium gravity viscous crude (10-20 cp) in high permeability sands. The field is being developed under pattern and peripheral water injection. Due to the adverse mobility ratio, waterflooding is expected to result in lesser sweep and ultimately affect oil recovery. The potential for chemical enhanced oil recovery (EOR) has been recognized from an early stage in the field development, with polymer flooding identified for early implementation, followed by staged-wise implementation of Alkaline-Surfactant-Polymer (ASP) injection. To understand and evaluate the efficiency of chemical flooding, a closely spaced normal five spot EOR pilot is being conducted in the fluvial FM1 reservoir units of the Mangala Field. Polymer injection in the pilot commenced in August 2011, with a series of short term polymer injectivity tests including multi rate test in one of the injectors. These tests provided useful insight about polymer rheological characteristics under reservoir conditions. Non-Newtonian behaviour of the polymer helped in injecting the ~30 cp solution within the designed surface pressure. Radial well modeling confirmed the shear thinning characteristics of the polymer which were in agreement with laboratory data, and that there has been no significant mechanical degradation of the polymer inside the well. Production logging conducted before, during and after the injectivity tests also show no significant change in injection profile as a result of the polymer injection. The injectivity test establishes that polymer injection is viable in Mangala reservoirs. The pilot results are important for an early implementation of fieldwide EOR in the Mangala Field. This paper presents details of the polymer injectivity tests including bottom-hole pressure measurements and production logging conducted during the tests. Details of the single well fine scale modeling to match the injectivity test pressure behaviour are then described.
- Asia > India > Rajasthan > Rajasthan Basin > Barmer Basin > Rajasthan Block > Mangala Field > Fatehgarh Formation (0.99)
- Asia > India > Rajasthan > Rajasthan Basin > Barmer Basin > Rajasthan Block > Mangala Field > Barmer Hill Formation (0.99)
- Asia > India > Rajasthan > Rajasthan Basin > Barmer Basin > Fatehgarh Formation (0.99)
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