Resin slurry plugging system suitable for fractured-vuggy formation and preparation and use thereof

A resin slurry for a fractured-vuggy formation comprising:

• 20%-40% of composite resin plugging agent, 0.5%-5.0% of consolidating agent, 0.5%-5.0% of flow pattern regulator, 0.3%-1.2% of first cross-linking agent, 0.3%-1.2% of retarder, and 3%-12% of filling agent in water by weight,
• wherein the composite resin plugging agent comprises:
• 20-30 parts of phenolic resin, 0.3-0.8 parts of modifier, 5-15 parts of epoxy resin, 5-15 parts of unsaturated polyester resin, 0.5-1.5 parts of second cross-linking agent, and 0.2-0.6 parts of tackifying polymer by weight;
• the modifier is an isocyanate-terminated polyurethane prepolymer;
• the second cross-linking agent is a combination of styrene and trimethylolpropane;
• the mass ratio of the styrene:the trimethylolpropane is 1-3:1;
• the tackifying polymer is a copolymer of 2-acrylamide-2-methylpropane sulfonic acid and acrylic acid;
• the composite resin plugging agent is prepared by:
• (1) heating the phenolic resin to 90-110° C., vacuumizing and cooling the phenolic resin, adding the modifier, and obtaining a modified resin through a reaction;
• and
• (2) uniformly mixing the modified resin, the epoxy resin and the unsaturated polyester resin to obtain a mixture, adding the mixture into a second portion of water, then successively adding the second cross-linking agent and the tackifying polymer, performing mixing and uniform dispersing, and then performing drying and crushing to obtain the composite resin plugging agent,
• wherein the consolidating agent is a bio-based latent consolidating agent;
• the bio-based latent consolidating agent is an imidazole-oxazine consolidating agent;
• the imidazole-oxazine consolidating agent is prepared from:
• 10-30 parts by mass of imidazole, 10-20 parts by mass of phytic acid, and 10-30 parts by mass of bisphenol A-benzoxazine;
• the preparing of the imidazole-oxazine consolidating agent comprising:
• adding a methanol solution of the phytic acid dropwise to a methanol solution of the imidazole to yield a first solution;
• adding the bisphenol A-benzoxazine to the first solution and mixing to yield a uniformly mixed solution, allowing the mixed solution to stand for layering and then extracting supernatant liquid from the mixed solution;
• and washing the supernatant liquid to obtain the imidazole-oxazine consolidating agent;
• the flow pattern regulator is prepared from:
• 10-20 parts by mass of 2-acrylamide-2-methylpropane sulfonic acid, 4-10 parts by mass of N,N-methylene bisacrylamide, 20-25 parts by mass of acrylic acid, 10-20 parts by mass of N-vinyl pyrrolidone, 5-10 parts by mass of divinylbenzene, 2-3 parts by mass of sodium dodecyl sulfate, 5-10 parts by mass of modified hydrophilic inorganic nano-material, and 1-1.5 parts by mass of initiator;
• the modified hydrophilic inorganic nano-material is hydrophilic nano-silica with a particle size of 20-100 nm;
• the preparing of the flow pattern regulator comprising:
• adding the 2-acrylamide-2-methylpropane sulfonic acid, the N,N-methylene bisacrylamide, the 20-25 Parts by mass of acrylic acid, the N-vinyl pyrrolidone, the divinyl benzene, and the sodium dodecyl sulfate into deionized water to form a first mixture, adjusting the pH of the first mixture to neutral and then mixing to yield a uniformly mixed second mixture;
• adding the modified hydrophilic inorganic nano-material and the initiator to the second mixture and stirring to yield a reaction product, then precipitating, washing, drying, and grinding the reaction product to obtain the flow pattern regulator;
• the first cross-linking agent is a combination of diethylenetriamine and dimethyl triphenyl methane tetraisocyanate;
• the mass ratio of diethylenetriamine to dimethyl triphenylmethane tetraisocyanate is 1-2:1;
• the retarder is a combination of sodium lignosulfonate and calcium saccharate;
• the mass ratio of the sodium lignosulfonate to the calcium saccharate is 1:1;
• and
• the filling agent is a combination of ultra-fine calcium carbonate and quartz sand, and the mass ratio of the ultra-fine calcium carbonate to the quartz sand is 1-2:3-5.