Feasibility and Mechanism of Deep Heavy Oil Recovery by CO2-Energized Fracturing Following N2 Stimulation
نویسندگان
چکیده
There are large, heavy oil reserves in Block X of the Xinjiang oilfields, China. Due to its large burial depth (1300 m) and low permeability (26.0 mD), traditional steam-injection technology cannot be used obtain effective development benefits. This paper conducts experimental simulation research on feasibility mechanism CO2-energized fracturing horizontal wells N2 foam huff-n-puff deep reservoirs with order further explore appropriate production technology. The foaming volume agent at different concentrations displacement effect gas/liquid ratios were compared by experiments. results show that a high concentration mixed crude is more conducive increasing extending half-life, best 3.0∼4.0%. 2D micro-scale visualization experiment has good selective blocking effect, which increases sweep area. number bubbles per unit area as ratio increases, 3.0∼5.0 being optimal ratio. Numerical that, when takes into account advantages viscosity reduction CO2 dissolution, phased recovery factor primary period can reach approximately 13.7%. A solvent pre-slug applied improve following for 5∼6 years, final 35.0%. methodology formulated this study particularly significant reservoir deeply buried permeability, would also guide similar deposits.
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ژورنال
عنوان ژورنال: Energies
سال: 2023
ISSN: ['1996-1073']
DOI: https://doi.org/10.3390/en16031161