Simulation of In-Situ Combustion Process in Balol Pilot
- Har Sharad Dayal (Oil & Natural Gas Corp. Ltd.) | Bharat Vinod Bhushan (Oil & Natural Gas Corp. Ltd.) | Sujit Mitra (Oil & Natural Gas Corp. Ltd.) | Vivek Pandey (Oil & Natural Gas Corp. Ltd.) | Ajit Chandmal Bhandari (Oil & Natural Gas Corp. Ltd.) | Madan Mohan Dwivedi (Oil & Natural Gas Corp. Ltd.)
- Document ID
- Society of Petroleum Engineers
- SPE Oil and Gas India Conference and Exhibition, 28-30 March, Mumbai, India
- Publication Date
- Document Type
- Conference Paper
- 2012. Society of Petroleum Engineers
- 5.5.8 History Matching, 5.2.2 Fluid Modeling, Equations of State, 4.6 Natural Gas, 4.3.4 Scale, 5.7.2 Recovery Factors, 2.4.3 Sand/Solids Control, 5.4.6 Thermal Methods, 5.1.5 Geologic Modeling, 5.4 Enhanced Recovery
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The In-situ Combustion (ISC) process has been successfully applied in the Southern part of Balol field for the last 21 years. This sector has oil of 300 cp viscosity and 15o API. The Pilot was initiated in 1990 followed by semicommercialization in 1992 and commercialization in 1997. It has been instrumental in enhancing the oil recovery from 13% to 50%. The ISC process in the pilot stage has been modeled on the thermal simulator. At first, the 1-D Combustion tube experiment has been successfully modeled and history matched with single equation incorporating the oxidation of heavy oil. The reaction kinetics from Combustion tube model with suitable modification and the Equilibrium Constants obtained from the Equation of State (EOS) modeling of PVT experiments has been utilised to history match the ISC pilot performance.
The ISC model calibrated from the history match of the actual data of the pilot shall enable in simulating the ISC process in the semi-commercial and the commercial phase. It would help in optimization of air injection rates, placement of air injectors, propagation of the combustion front, performance prediction and finally the ultimate recovery.
The successful history match of the ISC process in the Pilot area in terms of water cut, liquid rates has enabled better understanding of the process. It was possible to obtain a good agreement for the propagation of the combustion front and the temperature distribution.
The study has indicated that the ISC simulation on thermal simulator using single equation can be used as significant stepping stone in modeling the process in more detail using multiple equations and incorporating larger area.
The In-situ Combustion process is an Enhanced Oil Recovery (EOR) process in which a combustion front moves slowly from an injection well to one or more production wells. The process is typically initiated in an injection well by artificially igniting with the help of gas burner such that the combustion front created near the well can be propagated by continuous injection of air. The increase in recovery is due to mobilization of oil due to different driving mechanism generated after ignition. Several other mechanisms like reduction in oil viscosity, gas drive, insitu steam drive, oil up gradation, pressure maintenance (in dipping reservoirs) etc. also contribute towards improving the oil recovery. The process involves heat, mass transfer and chemical reactions in the porous media.
The Oil and Natural Gas Corporation Limited (ONGC) initiated Pilot testing of In-situ Combustion process in March 1990 in the heavy oil field of Balol in North Gujarat, India. The envisaged primary recovery from the field was expected to be low of the order of 13 %. Hence, in order to increase the recovery factor thermal methods were screened. The preliminary screening indicated the In-situ Combustion process to be the most suitable process in enhancing recovery.
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