Method for improving recovery yield of deep well reservoir
A recovery factor and oil reservoir technology, which is applied in the development of fluids, earth-moving drilling, wellbore/well components, etc., can solve the problems of gas channeling, inability to exert plugging control and flooding, and limited recovery factor improvement. The effect of preventing CO2 gas channeling, improving sweep volume and oil washing efficiency, and supplementing formation energy
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Embodiment 1
[0033] Put the deep well oil core in the core holder, inject saturated water first, and then inject saturated oil to obtain a simulated deep well reservoir; the temperature of the simulated deep well reservoir is 80°C, and the experimental pressure is 50MPa.
[0034] Supercritical CO 2 , polyoxyethylene lauryl polyoxypropylene ether (C 12 E. 9 P 3 ) and co-solvent amyl alcohol are mixed uniformly in a mass ratio of 100:1:4 to obtain supercritical CO 2 Mix fluids.
[0035] Inject the above-mentioned supercritical CO into the simulated deep well reservoir first. 2 Mixed fluid, supercritical CO 2 The injection rate of the mixed fluid is 0.1PV; then inject water into the simulated deep well reservoir, the water injection rate is 0.2PV; shut down the well, soak the well for 24h at a temperature of 80°C and an absolute pressure of 50MPa, and then open the well for mining.
[0036] After testing, the recovery rate of the above-mentioned simulated deep well reservoir is 16.2%. ...
Embodiment 2
[0038] Put the deep well oil core in the core holder, inject saturated water first, and then inject saturated oil to obtain a simulated deep well reservoir; the temperature of the simulated deep well reservoir is 90°C, and the experimental pressure is 50MPa.
[0039] Supercritical CO2 , polyoxyethylene lauryl polyoxypropylene ether (C 12 E. 9 P 3 ) and co-solvent amyl alcohol are mixed uniformly in a mass ratio of 100:0.8:2 to obtain supercritical CO 2 Mix fluids.
[0040] The lauryl alcohol polyoxyethylene polyoxypropylene ether is dissolved in water to obtain an aqueous solution containing the lauryl alcohol polyoxyethylene polyoxypropylene ether, and the mass content of the lauryl alcohol polyoxyethylene polyoxypropylene ether in the aqueous solution is 0.05%.
[0041] Inject the above-mentioned supercritical CO into the simulated deep well reservoir first. 2 Mixed fluid, supercritical CO 2 The injection volume of the mixed fluid is 0.1PV; then the above-mentioned aque...
Embodiment 3
[0044] Put the deep well oil core in the core holder, inject saturated water first, and then inject saturated oil to obtain a simulated deep well reservoir; the temperature of the simulated deep well reservoir is 80°C, and the experimental pressure is 60MPa.
[0045] Supercritical CO 2 , polyoxyethylene lauryl polyoxypropylene ether (C 12 E. 9 P 3 ) and co-solvent amyl alcohol are mixed uniformly in a mass ratio of 100:1:3 to obtain supercritical CO 2 Mix fluids.
[0046] Inject the above-mentioned supercritical CO into the simulated deep well reservoir first. 2 Mixed fluid, supercritical CO 2 The injection rate of the mixed fluid is 0.1PV; water is then injected into the simulated deep well reservoir, and the water injection rate is 0.2PV; mining.
[0047] After testing, the recovery rate of the above-mentioned simulated deep well reservoir is 18.7%.
[0048] to combine figure 1 and figure 2 Shown, the method for enhancing the recovery of deep well reservoirs of ab...
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