Method for oil displacement using carbon dioxide and foam
A technology of carbon dioxide and foam flooding, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc. It can solve the problem of extremely large density difference, achieve the effect of simple operation and improve oil displacement efficiency
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example 1
[0016] The nonionic surfactant alkyl glucoside (APG1214) mass fraction of preparation is 0.3%, and the aqueous solution of NaCl content is 60g / L.
[0017] The following steps are all carried out under the condition of simulated formation temperature of 50°C.
[0018] For a diameter of 2.50 cm and a length of 10.0 cm, saturated water and saturated oil are processed. The core parameters of this experiment are: porosity 15.19%, pore volume 7.364mL, gas permeability 8.035mD, original oil saturation 44.3%.
[0019] Carry out water flooding on the above core until the water content at the outlet exceeds 98%, the injection pressure is 4.0MPa, and the water flooding efficiency is 28.2%.
[0020] Under the condition of injection pressure of 4.0MPa, 0.1PV of the prepared surfactant solution and 0.1PV of carbon dioxide gas were injected alternately three times, with a total injection volume of 0.6PV.
[0021] Subsequent water flooding until the water content at the outlet is above 98%,...
example 2
[0023] Prepare two types of ionic surfactant cocamidopropyl betaine (CAB-35) mass fraction is 0.3%, NaCl content is the aqueous solution of 60g / L.
[0024] The following steps are all carried out under the condition of simulated formation temperature of 50°C.
[0025] For a diameter of 2.50 cm and a length of 10.0 cm, saturated water and saturated oil are processed. The core parameters of this experiment are: porosity 14.89%, pore volume 7.180mL, gas permeability 7.271mD, original oil saturation 52.5%.
[0026] Carry out water flooding on the above core until the water content at the outlet exceeds 98%, the injection pressure is 4.0MPa, and the water flooding efficiency is 27.4%.
[0027] Under the condition of injection pressure of 4.0MPa, 0.1PV of the prepared surfactant solution and 0.1PV of carbon dioxide gas were injected alternately three times, with a total injection volume of 0.6PV.
[0028] Subsequent water flooding until the water content at the outlet is above 98%...
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