Nano-fluid for reducing pressure and increasing injection in water injection development of ultra-low permeability reservoir and its preparation method
An ultra-low permeability and oil reservoir technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of increasing operation complexity and product price, weakening effect of decompression and increasing injection, and easy loss of nanomaterials , to achieve the effect of facilitating large-scale construction, improving the development effect, and making the preparation simple
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Embodiment 1
[0028] Such as figure 1 As shown, the preparation of double-group modified nano-silica particles:
[0029] Step 1. Combine 4g with a primary particle size of 7nm and a specific surface area of 200m 2 / g of nano-silica and 100mL of absolute ethanol were added to a three-necked flask, stirred for 20min, added 4g of vinyl triethoxysilane, adjusted the oil bath temperature to 70℃, and reacted under nitrogen protection for 4h; disperse the fully reacted The liquid is separated by centrifugal separation or vacuum filtration, and the precipitate or filter cake is washed 4 times with absolute ethanol, and vacuum dried at 60°C for 24 hours to obtain a powdery solid.
[0030] Step 2. Disperse the solid powder obtained in step 1 in 100 mL of dimethylformamide under nitrogen protection, add 0.1 mol of HBr solution, heat to 50°C, stir the reaction for 4 hours, cool to room temperature, and centrifuge the reaction mixture Separate or separate by vacuum filtration, wash the precipitate or filte...
Embodiment 2
[0033] Such as figure 1 As shown, the preparation of double-group modified nano-silica particles:
[0034] Step 1. Combine 5g with a primary particle size of 7nm and a specific surface area of 250m 2 / g of nano-silica and 150mL of toluene were added to a three-necked flask, stirred for 10min, added 5g of vinyltrimethoxysilane, adjusted the oil bath temperature to 70℃, and reacted under nitrogen protection for 5h; centrifuge the fully reacted dispersion Or it can be separated by vacuum filtration, and the precipitate or filter cake is washed 4 times with absolute ethanol, and dried under vacuum at 60°C for 24 hours to obtain a powdery solid.
[0035] Step 2. Disperse the solid powder obtained in step 1 in 100 mL of dimethylformamide, under nitrogen protection, add a solution containing 0.1 mol of HBr, heat to 50°C, stir and react for 4 hours, and cool to room temperature. The resulting mixture Separate by centrifugation or vacuum filtration, and wash the precipitate or filter cake...
Embodiment 3
[0038] Preparation of nano-liquid for water injection development of ultra-low permeability reservoirs:
[0039] Step 1. Weigh 1 g of the double-group modified nano silica particles prepared in Example 1, add 500 mL of water, stir evenly, and heat to 60-80°C.
[0040] Step 2: Continue to stir and add 1 mol / L NaOH aqueous solution dropwise until the bi-group modified nano-silica particles are uniformly dispersed.
[0041] A laser particle size analyzer is used to measure the particle size distribution of the double-group modified nano-silica particles in the nano-liquid for blood pressure enhancement and injection, and the particle size distribution of the double-group modified nano-silica particles ranges from 10 to 20 nm.
[0042] Such as figure 2 As shown, select the ultra-low permeability natural core with gas permeability of 1~5mD, saturate simulated oil (viscosity 5mPa·s, 25℃), replace 30 pore volume (PV) with simulated water (3% NaCl), establish After the residual oil, the sta...
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