Weakly cross-linked copolymer and its preparation method and its application as a lost circulation agent and water-based drilling fluid and its application
A technology of cross-linking copolymer and cross-linking agent is applied in the field of water-based drilling fluid, which can solve the problems of poor plugging effect and achieve the effect of reducing filtration loss.
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[0041] The present invention also provides a preparation method of a weakly cross-linked copolymer, the method comprising: in an aqueous solvent, in the presence of an oxidation-reduction initiation system, a cross-linking agent and an emulsifier, the Compound, the compound shown in formula (2') and the compound shown in formula (3') carry out emulsion polymerization, wherein, the consumption of described cross-linking agent makes the content of cross-linking substructure in the obtained weakly cross-linked copolymer 0.1-1% by weight,
[0042] Formula 1') Formula (2')
[0043] Formula (3')
[0044] Among them, R 1 , R 1' , R 2 , R 2' , R 6 and R 6' each independently selected from H and C1-C6 alkyl; R 3 Alkylene group selected from C0-C6; R 4 Selected from -COOM, -SO 3 M or -CO-NH-R 5 -SO 3 M, R 5 An alkylene group selected from C0-C6, M is selected from H or an alkali metal element; R 7 An alkyl group selected from H or C1-C20.
[0045] Wherein, the subst...
Embodiment 1
[0106] This example is used to illustrate the weakly cross-linked copolymer of the present invention, its preparation method and lost circulation agent.
[0107] Add 0.615mol total amount (about 74g) of methacrylamide, 2-acrylamide-2-methylpropanesulfonic acid and cetyl methacrylate (molar ratio is 30:10:1) to 100g In water, adjust the pH to 7; add 1.75mmol of potassium persulfate and 0.3g of cross-linking agent N,N-methylenebisacrylamide, and stir and mix at 200rpm, 25°C for 40min; then add 120g of liquid paraffin ( Available from PARAFFIN of Anaiji Company), 8g of sorbitan fatty acid ester (available from Anaiji Company's SPAN-80) and 5g of polyoxyethylene sorbitan fatty acid ester (available from Anaiji Company Ji's TWEEN60), and the resulting mixture was emulsified on an emulsifier for 1min; then nitrogen gas was passed through for 15min to remove oxygen; 10min drop), and reacted at 50°C for 8h; the obtained emulsion is the plugging agent A1, wherein the content of the we...
Embodiment 2
[0109] This example is used to illustrate the weakly cross-linked copolymer of the present invention, its preparation method and lost circulation agent.
[0110] Add 0.572mol total amount (about 76.5g) of acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and octadecyl methacrylate (molar ratio is 15:10:1) to 100g of water , adjust the pH to 7; add 1.9mmol of ammonium persulfate and 0.34g of cross-linking agent N,N-ethylenebisacrylamide, and stir and mix at 220rpm and 25°C for 50min; then add 120g of liquid paraffin (purchased PARAFFIN from Anaiji Company), 7g of sorbitan fatty acid ester (available from Anaiji Company's SPAN-60) and 7g of polyoxyethylene sorbitan fatty acid ester (available from Anaiji Company company's TWEEN80), and the resulting mixture was emulsified on the emulsifier for 2min; followed by nitrogen gas for 15min to remove oxygen; then dropwise added 0.95mmol of sodium thiosulfate (in the form of an aqueous solution with a concentration of 0.095mol / L) (a...
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