Oil displacement composition and preparation method thereof
A composition and oil displacement technology, which are applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor oil displacement efficiency and the like
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Embodiment 1
[0082] a, the anionic nonionic mixed surfactant structural formula of preparation is as follows, wherein, (1) Z 1 = H, Z 2 =H, nonionic surfactant; (2) Z 1 = H, Z 2 =CH 2 COONa, monophilic headgroup anionic surfactant; (3)Z 1 = Z 2 =
[0083] CH 2 COONa, double hydrophilic head group anionic surfactant; m 1 +m 2 = 4, n 1 +n 2 =35,m 3 +m 4 =3.
[0084]
[0085] Add 261 grams (1 mole) of dodecylaniline, 5.2 grams of sodium hydroxide and 13.1 grams of anhydrous potassium carbonate to a 5L pressure reactor equipped with a stirring device, and when heated to 80-90°C, open the vacuum system, Dehydrate under high vacuum for 1 hour, then replace with nitrogen for 3 to 4 times, adjust the reaction temperature of the system to 110°C and slowly introduce 178.2 grams (4.05 moles) of ethylene oxide, control the pressure ≤ 0.50MPa, wait for the ethylene oxide After the reaction was over, slowly feed 2053.2 grams (35.4 moles) of propylene oxide at 150°C, and control the pres...
Embodiment 2
[0090] a, the same as [Example 1], the difference is that after the reaction finishes, all the reaction solutions are acidified, washed with water, and evaporated to remove the solvent, then the mixture obtained is mixed with water, and the sodium hydroxide aqueous solution of 30wt% is used to adjust the concentration of the system. pH=12, the desired mixed surfactant S-2 was obtained.
[0091] b. Prepare the aqueous solution of S-2 and modified polyacrylamide (P1, copolymerized AM / AMPS molar ratio = 1 / 1, viscosity-average molecular weight 14.5 million) prepared in step a with oilfield simulated formation water A, stir for 4 hours, and the rest With [Example 1] b, the results are shown in Table 3. The oil-water interfacial tension of different concentrations of S-2 aqueous solution is shown in Figure 1.
[0092] c. Carry out indoor simulated oil displacement test with [Example 1] c, and the results are shown in Table 3.
Embodiment 3
[0094] a, the anionic nonionic mixed surfactant structural formula of preparation is as follows, wherein, (1) Z 1 = H, Z 2 =H, nonionic surfactant; (2) Z 1 = H, Z 2 =CH 2 COOH.HN(CH 2 CH 2 Oh) 2 , monophilic head group anionic surfactant; (3) Z 1 = Z 2 =CH 2 COOH.HN(CH 2 CH 2 Oh) 2 , amphiphilic head group anionic surfactant; m 1 +m 2 = 4, n 1 +n 2 =35,m 3 +m 4 =3.
[0095]
[0096] Same as [Example 2], except that 95% diethanolamine was used instead of 30wt% sodium hydroxide aqueous solution to adjust the pH of the system to 12 to obtain the desired mixed surfactant S-3.
[0097] b. Prepare the aqueous solution of S-3 and modified polyacrylamide (P1, copolymerized AM / AMPS molar ratio = 1 / 1, viscosity-average molecular weight 14.5 million) prepared in step a with oilfield simulated formation water A, stir for 4 hours, and the rest With [Example 1] b, the results are shown in Table 4. The oil-water interfacial tension of different concentrations of S-3 aq...
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