Laboratory Researches of the Heavy Oil Displacement from the Russkoye Field's Core Models at the SWAG Injection and Development of Technological Schemes of Pump-Ejecting Systems for the Water-Gas Mixtures Delivering
- Alexander Nikolaevich Drozdov (Gubkin Russian State University of Oil & Gas) | Nikolay Alexandrovich Drozdov (Gubkin Russian State University of Oil & Gas)
- Document ID
- Society of Petroleum Engineers
- SPE Heavy Oil Conference Canada, 12-14 June, Calgary, Alberta, Canada
- Publication Date
- Document Type
- Conference Paper
- 2012. Society of Petroleum Engineers
- 4.1.5 Processing Equipment, 2.5.2 Fracturing Materials (Fluids, Proppant), 5.2 Reservoir Fluid Dynamics, 5.4.6 Thermal Methods, 5.4 Enhanced Recovery, 5.4.1 Waterflooding, 1.6.9 Coring, Fishing, 5.7.2 Recovery Factors, 1.2.3 Rock properties, 4.6 Natural Gas, 4.1.4 Gas Processing, 4.3.4 Scale, 5.3.4 Reduction of Residual Oil Saturation, 4.3.1 Hydrates, 4.1.2 Separation and Treating, 2.4.3 Sand/Solids Control, 5.4.2 Gas Injection Methods
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"Simultaneous water and gas" (SWAG) injection is the effective method of enhanced oil recovery. However, until recently the effect of SWAG in the development of heavy oil fields has been studied insufficiently.
In the present study laboratory researches have confirmed that SWAG injection when 25% gas content in the mixture significantly increases the displacement efficiency of heavy oil with the viscosity 217 mPa*s of Russkoye deposit, compared with water flooding. It has allowed extending the effective application of SWAG as a non-thermal method of enhanced oil recovery more than twice.
According to the results of laboratory experiments to pre-extracted and not extracted core material, it was found that the degree of hydrophobic pore surface, which depends on the adsorption of polar components of oil, significantly affect the oil displacement efficiency when SWAG implementing.
It was established that SWAG at the optimum gas content is effective for both hydrophilic and hydrophobic environments. The values of the heavy oil displacement efficiency for the hydrophilic core material of Russkoye field are about 1.8 times higher than for hydrophobic.
The technology for SWAG injection from the use of mono-block multistage pump-ejecting systems has been developed. The technology can significantly improve the systems efficiency and the process of water-gas mixtures delivering into injection wells.
The obtained results allow creating non-thermal energy-efficient methods for developing and improving oil recovery of heavy oil fields.
Interest in the use of SWAG technology is continuously growing. This is because the water-gas exposure combines the positive aspects of such known methods of oil production, as water flooding and injection of hydrocarbon gas into the formation.
However, many issues related to the filtration process of water-gas exposure studies, currently remain unresolved. The effect of SWAG on the replacement of heavy oil do not studied, the influence of wettability of the collector on the process efficiency requires further investigations.
In a number of previously published papers it was proposed to pump water and gas together with the pump-ejecting systems [1, 2]. However, these technologies have not been completed yet to the practical application in the fields due to a lack of knowledge of issues for real field's conditions, including considering the use of existing infrastructure. Consequently, the developing of new technological schemes of pump-ejecting systems is need for the successful implementation of SWAG on the oil fields.
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