Composite nanometer SiO<2> pressure-lowering and injection-augmenting agent and preparation method thereof
An injection enhancer and nanotechnology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of water injection development effect, poor water absorption capacity of water injection wells, and high injection pressure, so as to improve water injection development effect and reduce Oil-water interfacial tension, the effect of inhibiting clay swelling
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[0013] The first step of water injection well nano-SiO 2 Pressure-reducing injection agent component weight ratio: 0.18% surfactant sodium fatty alcohol polyoxyethylene ether sulfate, 0.12% sodium dodecylbenzenesulfonate, 0.20% surface modifier Si-69, 0.15% nano-SiO 2 , and the rest is water. The second step nano-SiO 2 Preparation method of depressurizing injection agent: Add appropriate amount of 0.2mol / L tetraethyl orthosilicate and absolute ethanol to the flask, stir continuously at 25°C for 10 minutes, add deionized water and ammonia water prepared in a ratio of 4:1 at one time The mixed solution was heated to 80°C, and the stirring speed was kept at 400rpm for water bath reaction for 8h. After high-speed centrifugation and ultrasonic cleaning, SiO 2 The pellets were washed 3 times with deionized water, dried, ground, and sieved to obtain nano-SiO 2 .
[0014] Then add fatty alcohol polyoxyethylene ether sodium sulfate and sodium dodecylbenzenesulfonate into the ename...
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