Zwitterionic copolymer oil-displacing agent and synthesis method thereof
A technology of zwitterion and oil displacing agent, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor salt resistance, shear thinning, high temperature degradation, etc., and achieve good temperature and salt resistance and Increased shear resistance, viscosity, temperature and salt resistance, and enhanced oil recovery
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Embodiment 1
[0023] Example 1: Synthesis of AM / AA / NXBH / NMQS quaternary copolymer
[0024] The preparation method of polymer AM / AA / NXBH / NMQS is as follows: a. Add 0.03g NXBH, 0.01g NMQS and 10.00g deionized water to a 100mL beaker according to the ratio in Table 1, stir until completely dissolved, and transfer to a three-necked flask B. In another beaker, add 7.00gAM, 2.96gAA and 30.00g deionized water, stir until completely dissolved, and transfer to the three-necked flask in step a; c. slowly drop 20 mass into the flask under cold water bath conditions % NaOH solution, adjust the pH of the solution to 7 and cool to room temperature; d. Add a certain amount of deionized water to prepare the solution into a 10-20% by mass aqueous solution of the total monomer mass percentage, and under the condition of a constant temperature water bath at 40°C Deoxygenate with nitrogen and stir for 10-20min; e. Add initiator ammonium persulfate solution and sodium bisulfite solution (the molar ratio of ammoniu...
Embodiment 2
[0027] Example 2: Characterization of AM / AA / NXBH / NMQS quaternary copolymer structure
[0028] The structure analysis of the polymer AM / AA / NXBH / NMQS prepared in Example 1 is as follows:
[0029] IR spectra of polymer AM / AA / NXBH / NMQS, such as figure 1 Shown: 3444.24-3228.25cm -1 There is a wide stretching vibration peak in the range, which is due to -OH and -NH 2 Caused by peak coincidence; 1699.69cm -1 It is the stretching vibration peak of -C=O; at 1560.12cm -1 Is -CH in NXBH 3 Affected by the positive charge of -N-, it is caused by moving to the high wave number area; 1454.06cm -1 , 1401.99cm -1 And 1320.99cm -1 Here is the characteristic peak of β-cyclodextrin ring structure.
Embodiment 3
[0030] Example 3: Examination of shearing properties of AM / AA / NXBH / NMQS quaternary copolymer
[0031] The quaternary polymer prepared in Example 1 was formulated into a 3000mg / L aqueous solution at 25°C, using a HAAKERheoStress6000 rheometer for 12-1000s -1 Under the conditions, determine the apparent viscosity of the polymer aqueous solution changes with the shear rate, the data is as follows figure 2 . From figure 2 It can be seen that the apparent viscosity of the polymer gradually decreases as the shear rate increases. When the shear rate is 100s -1 When the apparent viscosity of the polymer solution is 270mPa·s; when the shear rate is increased to 1000s -1 When the apparent viscosity of the polymer solution is 101mPa·s, relative to 12s -1 When the viscosity retention rate can reach 22.19%, the results show that the polymer at a shear rate of 1000s -1 Under the conditions, it has obvious shear resistance.
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