Feasibility study of geothermal energy assisted recovery for offshore shallow heavy oil reservoirs

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    The thermal recovery technology is the main method for heavy oil reservoirs in Bohai Oilfield,but it is usually accompanied with high-energy consumption and large capital expenses,restricting the exploitation of offshore heavy oil reservoir. With regard to Bohai Oilfield A with abundant geothermal resources,we proposed a deep geothermal energy assisted recovery method for shallow heavy oil reservoirs and systematically introduced its technological design. In light of the actual geological background of Bohai Oilfield A,a numerical model of geothermal energy assisted recovery for heavy oil reservoirs was built,which was combined with the heat transfer theory and oil-gas flow laws. In addition,the feasibility of this method was verified by economic evaluation,and sensitive factors were analyzed. The simulation results show that the injected water,heated by the geothermal reservoir,has a temperature above 80 ℃ when it returns to the heavy oil reservoir. The water can effectively heat the heavy oil reservoir to dramatically reduce the viscosity of heavy oil. The cumulative oil production reaches 3.0×106 m3,which is twice the cumulative oil production by conventional seawater injection. Moreover,the net present value over 20 years of production is CNY21.8×108,proving the good economic feasibility of geothermal energy assisted recovery,and the payback period is 2 years. Sensitivity analysis finds that recovery results are satisfactory at the water injection temperature of 50-60 ℃;the long horizontal well section reveals a better utilization of geothermal energy and a higher recovery factor of heavy oil;the water injection rate has multiple influences on geothermal energy assisted recovery.

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  • Online: January 20,2022
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