Carbon dioxide oil displacement method
An oil displacement method and carbon dioxide technology, which are applied in chemical instruments and methods, earth-moving drilling and production, and bulk chemical production, etc. The effect of recovery factor, ease of recovery and treatment, and enhanced solubilization ability
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[0040] Table 1 Supercritical CO 2 Preparation conditions of microemulsion
[0041]
[0042] The supercritical CO produced by the preparation conditions of Examples 1-5 and Comparative Examples 1-10 was tested by displacement experiments. 2 Oil displacement effect of microemulsion.
[0043] 2. Displacement experiment
[0044] A natural core with a length of 5×5×10 cm was selected, and the gas permeability was 0.166×10 -3 μm 2 , porosity 8.8%. The oil sample used is kerosene with a density of 0.783g / cm at 25°C 3 , the viscosity is 1.318mPa·s.
Embodiment 6
[0046] A carbon dioxide flooding method, comprising the steps of: supercritical CO 2 The microemulsion was injected into the saturated kerosene core at a flow rate of 0.5mL / min to displace the kerosene, and the supercritical CO 2 The injection pressure of the microemulsion is 11MPa, the temperature is 50°C, and 0.6PV supercritical CO is injected 2 Stop flooding after the microemulsion, read the volume of kerosene displaced, and calculate the recovery factor.
Embodiment 7
[0048] A carbon dioxide flooding method, comprising the steps of: supercritical CO 2 The microemulsion was injected into the saturated kerosene core at a flow rate of 0.5mL / min to displace the kerosene, and the supercritical CO 2 The injection pressure of the microemulsion is 14MPa, the temperature is 55°C, and 1.2PV supercritical CO is injected 2 Stop flooding after the microemulsion, read the volume of kerosene displaced, and calculate the recovery factor.
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