Preparation method of coated proppant
A technology of proppant and film covering, which is applied in the field of preparation of film covering proppant, which can solve the problems of reservoir damage, inability to self-suspend, and high cost of fracturing
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[0032] A method for preparing a film-coated proppant, comprising the steps of:
[0033] (1) Prepare the following materials: 40 / 70 mesh quartz sand, polyol resin, epoxy resin, epoxy resin curing agent, isocyanate resin, catalyst and amine additives, wherein the hydroxyl equivalent of polyol resin is 60-300 , the mass fraction of isocyanate resin is 2 / 5-4 / 5 of the amount of polyol resin;
[0034] (2) heating: the quartz sand in the step (1) is heated to 180-230 ℃;
[0035] (3) sand mixing: the quartz sand in the step (2) is added in the sand mixing pot to mix sand at a speed of 70-100 rev / min;
[0036] (4) First time coating: add the epoxy resin in the step (1) to the casserole; when the temperature of the casserole drops to 150-200°C, add the epoxy resin curing agent in the step (1);
[0037] (5) Second coating: when the temperature of the mixing pot drops to 80-130°C, add polyol resin and catalyst; add amine additives at 70-110°C; add isocyanate resin at 60-100°C;
[0038]...
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