Feasibility of Air Injection in a Light Oil Field of Western India
- Sujit Mitra (Oil & Natural Gas Corp. Ltd.) | Bharat Vinod Bhushan (Oil & Gas Corp. Ltd.) | Venkata Raju Pilli (Oil & Natural Gas Corp. Ltd.) | Subir Kumar (Oil & Natural Gas Corp. Ltd.) | Sidhartha Sur (Oil & Natural Gas Corp. Ltd.) | Sudarshan A. Mehta | Robert Gordon Moore (U. of Calgary)
- Document ID
- Society of Petroleum Engineers
- SPE Oil and Gas India Conference and Exhibition, 20-22 January, Mumbai, India
- Publication Date
- Document Type
- Conference Paper
- 2010. Society of Petroleum Engineers
- 5.7.2 Recovery Factors, 1.14 Casing and Cementing, 5.5.8 History Matching, 7.2.3 Decision-making Processes, 5.4 Enhanced Recovery, 4.1.5 Processing Equipment, 5.4.2 Gas Injection Methods, 4.2.3 Materials and Corrosion, 5.4.1 Waterflooding, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 6.5.2 Water use, produced water discharge and disposal, 4.6 Natural Gas, 2.4.3 Sand/Solids Control, 4.1.2 Separation and Treating, 1.6.9 Coring, Fishing, 4.5.10 Remotely Operated Vehicles
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Overall field settings like dip of 80, partial water drive, permeability of less than 50md and with 350 API oil make Field - A in Western India an ideal choice for gas injection. Non-availability of hydrocarbon / non-hydrocarbon gas makes air injection a preferred alternative. Viability of air injection process in laboratory was established through displacement tests in 1.83m long & 100mm diameter combustion tube using synthetic and natural core at IRS, ONGC.
In view of limitations of laboratory generated oil reactivity data for carrying out prediction in STARS, following workflow was adopted to estimate recovery from air injection.
• Predicting recovery by immiscible gas injection
- Pressure maintenance and Immiscible displacement
• Predicting Volumetric Sweep Efficiency
- From miscible Gas Injection. It is felt that Miscible process mimics closely air injection as both these processes have displacement efficiency of more than 90%
• Predicting Recovery by Air Injection
- Integrating immiscible flue gas with Nelson & McNeil derived profile after considering volumetric sweep from miscible gas displacement process. Air injection has the potential to enhance recovery from 19% to 62%.
The present work deals with the recovery by air injection in one of the clastic light oil reservoir in Field - A of one of the western on-shore Assets of ONGC, India. Areal extent of the field is 16.5 km2 and contains about 16.15 MMt of proved oil inplace. Envisaged ultimate recovery from this field is about 10% and till March 2008, about 1.5% of OIIP has been exploited. It contributes about 265 m3/day of 350 API oil. There are four contributing sands namely K, C, M, and O from top to bottom with major contribution coming from K pay Sands. The field was put on production in 1994. Water injection has been initiated in June 2008.
The objective of the present work is to ascertain the feasibility of air injection with a view to identify a recovery technique in Field-A which can add reserves over water flood. The work is an attempt to achieve at a recovery factor incorporating pressurization, immiscible gas drive and thermal displacement component of air injection. The work flow has detail Laboratory studies followed by a combination of simulation and analytical exercise for preparing the conceptual design of the
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