Acrylamide/2-acrylamido-2-methylpropane sulfonic acid sodium/cyclodextrin modified acrylamide (AM/AMPS-Na/MAM) copolymer and preparation method thereof
A technology of copolymer and concentration, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as the gap in the performance and maintenance of drilling fluids, and achieve the effects of simple and feasible preparation methods, mild reaction conditions, and good effects
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Embodiment 1
[0010] Example 1 The preparation method of AM / AMPS-Na / MAM copolymer fluid loss control agent.
[0011] Add 200 mL of the prepared 0.1 g / L acrylamide AM aqueous solution into a 500 mL three-necked beaker, and then add 10 mL of the cyclodextrin-modified acrylamide MAM aqueous solution with a concentration of 0.4 g / L and 0.5 g / L 2- Acrylamido-2-methylpropanesulfonate sodium AMPS-Na aqueous solution 21mL; then add 1mL disodium edetate chelating agent with a concentration of 0.3g / L and potassium persulfate oxidant with a concentration of 0.5g / L in sequence 1mL and a concentration of 1.0g / L sodium bisulfite reducing agent 0.5mL. After fully stirring and mixing uniformly on a magnetic stirrer, nitrogen protection deoxidizes, and reacts at 40-50° C. for 5-6 hours to obtain a transparent gel-like product AM / AMPS-Na / MAM copolymer.
[0012] Measure the intrinsic viscosity of AM / AMPS-Na / MAM copolymer according to the standard described in GB12005.1-89, then measure the molecular weight o...
Embodiment 2
[0013] Example 2 The fluid loss control effect of AM / AMPS-Na / MAM copolymer.
[0014] In order to evaluate the fluid loss reduction effect of AM / AMPS-Na / MAM copolymer at a higher temperature, the base slurry was prepared according to the national standard GB / T16783-1997. That is, add 2.5 g of anhydrous sodium carbonate and 20 g of bentonite to 500 mL of deionized water, stir at a high speed for 20 min, and then keep it sealed for 24 h to obtain a freshwater base slurry. Similarly, add 4% NaCl to 4% fresh water base slurry, stir at high speed for 20 minutes, and then leave it in a sealed container for 24 hours to obtain a salt water base slurry; Set aside for 24 hours to obtain a saturated brine base slurry; in 500mL deionized water, add 22.5g NaCl, 2.5g anhydrous calcium chloride, 6.5g magnesium chloride hexahydrate, 75g calcium bentonite and 4.5g anhydrous sodium carbonate, stir at high speed for 20min, then seal and statically Set aside for 24 hours to obtain a composite bri...
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