Cross-linking agent and organogel water blocking agent and its preparation method and application
A technology of organic gel and water blocking agent, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well parts, etc., which can solve the problems of polymers such as weak temperature resistance and salinity resistance, and achieve thermal stability Good, the agent is safe and non-toxic, and the effect of increasing the benefit and recovery rate
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Embodiment 1
[0049] (1) Chemical modification of crosslinking agent: take 40g polyethyleneimine (PEI, M=3.0×10 3 , 30 wt% aqueous solution) was placed in a reaction flask with a condenser, a thermometer, a stirring bar and an addition funnel. While stirring, take 9ml of acetic anhydride into the addition funnel and slowly add it into the reaction flask. After the addition of acetic anhydride is complete, stir the reactant at 60°C to 70°C for 3 hours, cool to room temperature and take it out. The degree of carboxylation was 45% by titration method, and the pH value of the solution was adjusted to 7.0 with 50 wt% sodium hydroxide solution. The concentration of PEI in the product was adjusted to 12 wt% with water to obtain polymer modified crosslinking agent PEI-A 1#.
[0050] (2) Preparation of polymer organogel water blocking agent solution: take 1.25g polyacrylamide (M=8.0×10 6 , degree of hydrolysis 3%) add 60g water, stir for 4 hours until polyacrylamide is completely dissolved; then t...
Embodiment 2
[0064] (1) Chemical modification of crosslinking agent: take 40g polyethyleneimine (PEI, M=1.5×10 4 , 35wt% aqueous solution) was placed in a reaction flask with a condenser, a thermometer, a stirring bar and an addition funnel. While stirring, put 12ml of acetic anhydride into the addition funnel and slowly add it into the reaction flask. After the addition of acetic anhydride is complete, stir the reactant at 60°C to 70°C for 3 hours, cool it to room temperature, take it out, and take a small amount for use. The degree of carboxylation was tested by titration, and the result was 50%, and the pH value of the solution was adjusted to 7.0 with 50 wt% sodium hydroxide solution. The concentration of PEI in the product was adjusted to 12 wt% with water to obtain polymer modified cross-linking agent PEI-A 2#.
[0065] (2) Polymer organogel water blocking agent solution preparation: get 0.8g acrylamide / tert-butyl acrylate copolymer (acrylamide 95wt% in the copolymer, tert-butyl acr...
Embodiment 3
[0074] (1) Preparation of polymer organogel water blocking agent solution: take 0.2g polyacrylamide (M=1.2×10 7 , degree of hydrolysis 10%) add 75g water, stir 4 hours to dissolving completely, then add mineral salt according to the prescription of preparing simulated brine to form simulated brine (total salinity of solution=201240mg / L, the total amount of calcium and magnesium ions 5000mg / L, sodium chloride 18.5wt%, anhydrous calcium chloride 1.14wt%, magnesium sulfate hexahydrate 0.865wt%), after stirring and dissolving, add 0.4g polymer modified cross-linking agent PEI-A 2# , 0.2g sodium bicarbonate, 0.3g edetate sodium salt, 0.5g glycine, make up the total mass of the solution with water to 100g, stir well and set aside.
[0075] (2) Gelling time and thermal stability test: After the polymer organogel water blocking agent solution is prepared, put the solution into a vial and seal it with a cap, put it in a 90°C oven, observe and record the gelling time, Placed in an oven...
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