Oil displacement method for dense oil reservoir, oil displacement agent, and manufacturing method thereof
An oil displacement method and technology for tight oil reservoirs, applied in chemical instruments and methods, preparation of organic compounds, earthwork drilling and production, etc., can solve problems such as ineffective injection and increased injection pressure, so as to avoid core end effect and reduce displacement The effect of replacing the pressure and increasing the degree of recovery
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Embodiment 1
[0042] osmosis test
[0043] Use methyl 9-decenoate and methyl 9-dodecenoate as oil displacement agents for tight oil reservoirs, and use distilled water, fatty alcohol polyoxyethylene ether, sodium dodecylbenzenesulfonate, dodecyl Sodium sulfate was used as a reference, and the osmosis contrast experiment was carried out.
[0044] The experimental core uses an outcrop core with a permeability of about 0.4mD. The core is dried and weighed; vacuumized; saturated with white oil, weighed; Since the white oil is small compared with the imbibant, the imbibition recovery is calculated by the change of core mass.
[0045] Such as figure 1 Shown is the comparison chart of postharvest imbibition rate of each imbibed agent. In the initial stage of the imbibition experiment, the recovery degree of several imbibants increased rapidly but the difference was not large; after 24 hours, distilled water, fatty alcohol polyoxyethylene ether, sodium dodecylbenzenesulfonate and sodium dodecyl ...
Embodiment 2
[0047] Injection pressure experiment of different oil displacement agents
[0048] Methyl 9-decenoate was used as oil displacement agent in tight oil reservoirs, and distilled water, silica nano-solution 1#, silica nano-solution 2#, 2D nano-black card solution, and drag-reducing agent were used as references to inject Pressure contrast experiment.
[0049] The experimental cores use outcrop cores with a permeability of about 0.4mD. The cores are dried; vacuumized; saturated with white oil; experiments are carried out with different oil displacement agents, and the changes in injection pressure during the displacement process of each oil displacement agent are recorded.
[0050] Such as figure 2 Shown is the comparison chart of injection pressure of different displacing agents. For tight cores with a permeability of 0.4 mD, except for the tight oil displacement agent 9-decenoic acid methyl ester, the injection pressure of other oil displacement agents rises rapidly during th...
Embodiment 3
[0052] Core flooding experiment
[0053] The experimental core uses an outcrop core with a permeability of about 0.4mD. Dry the core and weigh it; vacuumize; saturate the white oil and weigh it; the displacement process is first carried out with water flooding to a water content of 98%, and then the oil displacement agent for tight oil reservoirs Methyl 9-decenoate was used as an oil displacement agent to displace water to 98%, followed by subsequent water flooding.
[0054] Such as image 3Shown is the core displacement dynamic curve. In the process of water flooding, the injection pressure rises simultaneously with the recovery degree, the pressure drops after the water breaks through, the water cut rises rapidly, and the recovery degree tends to be stable at about 30%. After injecting the new tight oil displacement agent 9-decenoic acid methyl ester, the pressure drops, and the recovery degree increases steadily, and the final enhanced recovery reaches 57.52%. The oil di...
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