A temperature-resistant and salt-resistant foam control and flooding system prepared from high-salinity formation water
A high-salinity, temperature-resistant and salt-resistant technology, which is used in mining fluids, drilling compositions, chemical instruments and methods, etc. Application and other issues, to achieve the effect of improving oil washing efficiency, improving temperature and salt resistance, and reducing gas-liquid mass transfer speed
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[0042] A method for preparing a temperature-resistant and salt-resistant foam control and flooding system prepared from high-salinity formation water, the steps are as follows:
[0043] (1) At 25°C, add citrate to the water first, stir for 3-5 minutes to fully dissolve the citrate, and then add nano-SiO 2 After stirring for 3-5 minutes, sonicate for 60 minutes to make nano-SiO 2 Can be uniformly dispersed in water to obtain nano-SiO 2 dispersed aqueous solution;
[0044] (2) In nano-SiO 2 Disperse the aqueous solution and then add the surfactant THSB, stir for 3-5 minutes to fully dissolve, and obtain the first mixed solution;
[0045] (3) Partially hydrolyzed HPAM was added to the first mixed solution, and the solution was stirred for 6 hours to obtain a temperature-resistant and salt-resistant foam control and flooding system prepared from high-salinity formation water.
[0046] An oil displacement method of a temperature-resistant and salt-resistant foam control and flo...
Embodiment 1
[0057] This example evaluates the flocculation, foaming and foam stabilization performance of the temperature-resistant and salt-resistant foam control and flooding system prepared from high-salinity formation water.
[0058] At 25°C, prepare nano-SiO 2 The mass fraction is 1%, the mass fraction of THSB is 0.05%, the mass fraction of partially hydrolyzed HPAM is 0.1%, the average molecular weight is 4 million, the degree of hydrolysis is 6%, the mass fraction of sodium citrate is 0.1%, and the balance is a composite system solution of water , the water is simulated mineralized water prepared according to reservoir conditions, the total salinity is 220000mg / L, where Ca2+ with Mg 2+ The ion concentration is 2000mg / L.
[0059] Such as figure 1 As shown, under the unstirred condition, the control and flooding system has less flocculation at 25°C and 220,000 mg / L. After aging under high temperature conditions, as figure 2 As shown, a large amount of flocculation will be formed ...
Embodiment 2
[0064] A temperature-resistant and salt-resistant foam control and flooding system prepared from high-salinity formation water, including the following components by mass fraction: 1.5% nano-SiO 2 , 0.1% THSB, 0.15% partially hydrolyzed polyacrylamide (HPAM), the average molecular weight is 6 million, the degree of hydrolysis is 8%, 0.1% potassium citrate, the balance is water, and the sum of the mass fractions of each component is 100% , the water is simulated mineralized water prepared according to reservoir conditions, the total salinity is 220000mg / L, where Ca 2+ with Mg 2+ The ion concentration is 2000mg / L.
[0065] A method for preparing a temperature-resistant and salt-resistant foam control and flooding system prepared from high-salinity formation water, the steps are as follows:
[0066] (1) At 25°C, add 0.15g of potassium citrate to 99.25g of simulated mineralized water, stir to fully dissolve the potassium citrate, and then add 1.5g of nano-SiO 2 Stir for 3-5 min...
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