Preparation method of salt-tolerant gemini zwitterionic viscoelastic surfactant and high salinity water-based clean fracturing fluid
A surfactant, zwitterion technology, applied in the preparation of sulfonates, chemical instruments and methods, preparation of sulfonic acids, etc., can solve problems such as non-resistance to salinity, and achieve strong shear resistance and excellent rheological properties. Effect
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Embodiment 1
[0049] The method of synthesizing the salt-tolerant type gemini zwitterionic viscoelastic surfactant with erucamide propyl dimethylamine of the present embodiment is as follows:
[0050] Epichlorohydrin and taurine are obtained by reacting at 40°C for 6 hours in a mixture of water and ethanol at a molar ratio of 2:1. Then, the molar ratio of erucamide propyl dimethylamine and the intermediate is (2-2.5): 1, and the mixed solution of water and ethanol is used as the solvent. Hour. Evaporate the solvent at 80°C on a rotary evaporator, dissolve the crude product with ethyl acetate at 40°C, and then recrystallize the ethyl acetate solution at 5°C to remove unreacted erucamide propyl dimethyl amine to obtain a crystalline product; the crystalline product was treated by rotary evaporation to remove ethyl acetate to obtain a pure salt-tolerant gemini zwitterionic viscoelastic surfactant.
Embodiment 2
[0052] Take the viscoelastic surfactant in Example 1, use the 3wt% seawater-based clean fracturing fluid prepared by South China Sea seawater in Table 1, at 140°C, 170s -1 Under the condition of shearing for about 2 hours, the apparent viscosity is still above 50mPa.s, which meets the requirements of the industry standard SY / T6376-2008.
Embodiment 3
[0054] Get the viscoelastic surfactant in Example 1, use the 3wt% seawater-based clean fracturing fluid prepared by the Gulf of Mexico seawater in Table 1, at 140 ° C, 170s -1 Under the condition of shearing for about 2 hours, the apparent viscosity is still above 40mPa.s, which meets the requirements of the industry standard SY / T6376-2008.
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