Pilot to Full-field Polymer Application in One of the Largest Onshore Field in India
- Dhruva Prasad (Cairn India Ltd.) | Amitabh Pandey (Cairn India Ltd.) | M. Suresh Kumar (Cairn India Ltd.) | Nitish Koduru (Cairn India Ltd.)
- Document ID
- Society of Petroleum Engineers
- SPE Improved Oil Recovery Symposium, 12-16 April, Tulsa, Oklahoma, USA
- Publication Date
- Document Type
- Conference Paper
- 2014. Society of Petroleum Engineers
- 2.2.2 Perforating, 1.8 Formation Damage, 3.3.1 Production Logging, 4.1.5 Processing Equipment, 5.5.8 History Matching, 5.6.5 Tracers, 6.5.2 Water use, produced water discharge and disposal, 5.4.1 Waterflooding, 4.6 Natural Gas, 4.1.2 Separation and Treating, 2.5.2 Fracturing Materials (Fluids, Proppant), 5.7.2 Recovery Factors, 5.3.2 Multiphase Flow, 4.3.4 Scale, 2.4.3 Sand/Solids Control, 5.5.2 Core Analysis, 5.2.1 Phase Behavior and PVT Measurements, 5.4.7 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex)
- chemical flood, polymer flood, polymer flood simulation, full field polymer application, polymer
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The paper discusses the full-filed polymer flood implementation plan post successful pilot result in one of the largest onshore field in India. Mangala field is characterized by multi-Darcy sandstones, high porosity and initial oil saturation, low temperature (65 degC) and low salinity (~6500 TDS). The crude is waxy and viscous, which result in unfavorable mobility for water flood. Based on the reservoir rock and fluid characteristic, chemical flood was identified as potential EOR method during the screening study.
During development of field, it was decided to establish the oil recovery efficiency of both polymer and alkali-surfactant-polymer flood separately. Based on this a normal 5 spot pilot along with observation wells was planned in one part of the field. The polymer flood pilot was concluded in Sep’12 and results were encouraging in terms of additional oil recovery and reversal of water cut. Additionally there has been learning in terms of surface facility, polymer preparation, polymer quality monitoring.
Post successful completion of pilot, it is planned to implement polymer flood at full-field scale. All the lab results and pilot learning have been incorporated to minimize the uncertainty and risks. Different subsurface injection pattern concepts have been evaluated based on the reservoir characteristic. Various parameters like pattern and number of wells, polymer viscosity, tapered vs. fixed concentration, polymer slug size etc. have been optimized and are discussed in the paper. Various sensitivities to capture the impact of polymer adsorption, implementation schedule, conformance in injectors, visco-elastic effect of polymer, polymer shear thinning characteristics etc. on recovery have been studied. Learning from pilot has been used in deciding the subsurface, surface facility, well design, pumping facility, selective completion for conformance control, surface pressure requirement, and minimize the viscosity loss across completion and sand face.
Surface facilities concepts have been finalized to prepare concentrated polymer at single location and pumping it to each well- for injection. - Polymer process has the potential to significantly improve sweep efficiency in the field, and increase expected ultimate recovery (EUR).The project is one of the largest in terms of scale, polymer usage and related facility and logistics.
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