Novel oil soluble viscosity breaking agent for thickened oil recovery
An oil-soluble viscosity reducer, a new type of technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of large fuel consumption, crude oil cannot flow to the wellhead, and the amount of thin oil restricts the use, and achieves spatial expansion. degree reduction effect
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[0015] The present invention is further described with reference to examples.
[0016] Preparation of raw materials: 80 parts of maleic anhydride, 20 parts of p-hydroxyanisole, 170 parts of toluene, 4 parts of acrylic acid, 5 parts of p-toluenesulfonic acid, 0.6 parts of azobisisobutyronitrile, and 300 parts of dichloroethane;
[0017] Its optimal formulation consists of 75 parts of maleic anhydride, 15 parts of p-hydroxyanisole, 3 parts of acrylic acid, 4 parts of p-toluenesulfonic acid, 0.4 parts of azobisisobutyronitrile, 150 parts of toluene, and 280 parts of dichloroethane ;
[0018] preparation:
[0019] a. Add maleic anhydride, p-hydroxyanisole and toluene into the reaction kettle, stir and raise the temperature to 80°C. After completely dissolving, add acrylic acid and p-toluenesulfonic acid, reflux for 4 hours, cool to room temperature, and filter to obtain horse Anhydride copolymer solvent;
[0020] b. Place the copolymer in the previous step in dichloroethane, ra...
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