Method for strengthening oil displacement, profile control and foaming by adopting hydrophobic metal organic framework material
A metal-organic framework and oil-displacing method technology, which is applied to chemical instruments and methods, production fluids, earth-moving drilling, etc., can solve the problems of limited and low oil recovery, etc. The effect of good suspension stability and broad application prospects
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Embodiment 1
[0033] A method for enhancing oil displacement profile control and foaming by using hydrophobic metal-organic framework materials, using direct injection of liquid media for flooding. Prepare formation water in the laboratory, and prepare ZIF-8 / formation water slurry according to ZIF-8: formation water mass ratio 2:98; rate of 33mD, plug-like) into the high-low-permeability parallel displacement system, the prepared formation crude oil (bubble point: 7.6MPa, density: 0.7663g / cm 3 ). First, a single formation water is used to displace oil until the high-permeability core and the low-permeability core do not produce oil, and the oil recovery ratios of the high-permeability core and the low-permeability core are measured to be 35.8% and 26.2% respectively (seefigure 1 ); and then according to ZIF-8 / formation water slurry: the volume ratio of formation water is 1:3 and the displacement system is alternately injected to displace the remaining crude oil in the core, and the size of ...
Embodiment 2
[0035] A method for enhancing profile control and foaming in oil displacement by using a hydrophobic metal-organic framework material, in which gas and hydrophobic metal-organic framework material slurry are alternately flooded. Prepare ZIF-8 / formation water-SDS slurry according to ZIF-8:formation water:sodium dodecyl sulfate (SDS) mass ratio of 2:97:1. High-permeability cores (permeability of 125mD, plug-like) and low-permeability cores (permeability of 33mD, plug-like) were selected and put into the high-low permeability parallel displacement system. Formation crude oil (bubble point: 7.6MPa, density: 0.7663g / cm 3 ). First inject a nitrogen slug with a volume of 0.1 times the total pore volume of the two cores, and then maintain the slurry slug: the nitrogen slug is equal to 1:3, and the crude oil in the core is alternately flooded with gas and slurry until no oil is produced. The size of the fluid slug during the alternating flooding process is 0.05 times the total volume...
Embodiment 3
[0038] For ZIF-8 foaming in embodiment 2, foam stabilizing effect evaluation: 10mL SDS-formation aqueous solution (the mass fraction of SDS is 1wt%) and high-pressure nitrogen (pressure is 32MPa) are mixed in the device of high-pressure band visual window, The water-air volume ratio was 1:5, and the experimental temperature was the reservoir temperature of 78°C. It was found that the volume of the generated bubbles was 18.5mL, but the bubbles basically disappeared after standing for 20 minutes (see Table 1).
[0039] Then 10mL of ZIF-8 / formation water-SDS slurry (the mass fraction of ZIF-8 is 2wt%, and the mass fraction of SDS is 1wt%) is mixed with high-pressure nitrogen gas (pressure 32MPa) in a high-pressure device with a visual window , the slurry-gas volume ratio is also 1:5, and the experimental temperature is the reservoir temperature of 78°C. It is found that the final bubble volume is 27mL, indicating that the ZIF-8 material participates in and promotes the foaming; an...
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