Polymer nanometer blocking agent for water-based drilling fluid and its preparation method
A nano-plugging agent, water-based drilling fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as poor plugging effect of the plugging agent, and solve the problems of well wall collapse and plugging. The effect of enhancing and stabilizing the well wall
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Embodiment 1
[0027] The polymer nano-sealing agent for water-based drilling fluid in this embodiment is mainly prepared from the following raw materials:
[0028] 5.6 parts of polyoxyethylene laurate, 2.4 parts of N-isopropylacrylamide, 16.3 parts of acrylic acid, 1.2 parts of methyl methacrylate and 0.1 part of dibenzoyl peroxide.
[0029] The organic solvent used in this embodiment is xylene.
[0030] The preparation method of the polymer nano-sealing agent for water-based drilling fluid of the present embodiment is:
[0031] Dissolve 5.6 parts of polyoxyethylene laurate in xylene, then add 2.4 parts of N-isopropylacrylamide, 16.3 parts of acrylic acid, and 1.2 parts of methyl methacrylate into the above solution. Raise to 45°C for pre-emulsification reaction for 1 hour, then dissolve 0.1 part of dibenzoyl peroxide in xylene, add drop by drop to the above pre-emulsification solution, after the addition is completed, heat up to 75°C for reaction 5 hours, the polymer nano-sealing agent f...
Embodiment 2
[0033] The polymer nano-sealing agent for water-based drilling fluid in this embodiment is mainly prepared from the following raw materials:
[0034] 4.8 parts of propylene glycol monostearate, 3.7 parts of N,N-dimethylacrylamide, 21.2 parts of acrylamide, 0.9 part of styrene and 0.21 part of azobisisobutyronitrile.
[0035] The organic solvent used in this embodiment is paraffin oil.
[0036] The preparation method of the polymer nano-sealing agent for water-based drilling fluid of the present embodiment is:
[0037] Dissolve 4.8 parts of propylene glycol monostearate in paraffin oil, then add 3.7 parts of N,N-dimethylacrylamide, 21.2 parts of acrylamide, and 0.9 parts of styrene into the above solution. Raise to 50°C for pre-emulsification reaction for 2 hours, then dissolve 0.21 parts of azobisisobutyronitrile in paraffin oil, add dropwise to the above-mentioned pre-emulsification solution, after the addition is completed, raise the temperature to 80°C for 8 hours, That i...
Embodiment 3
[0039] The polymer nano-sealing agent for water-based drilling fluid in this embodiment is mainly prepared from the following raw materials:
[0040] 5.9 parts of Span-65 were dissolved in cyclohexane, 4.1 parts of N-isopropylacrylamide, 17.3 parts of sodium p-styrenesulfonate, 1.4 parts of butyl acrylate and 0.35 parts of dibenzoyl peroxide.
[0041] The organic solvent used in this embodiment is cyclohexane.
[0042] The preparation method of the polymer nano-sealing agent for water-based drilling fluid of the present embodiment is:
[0043] Dissolve 5.9 parts of Span-65 in cyclohexane, then add 4.1 parts of N-isopropylacrylamide, 17.3 parts of sodium p-styrene sulfonate, and 1.4 parts of butyl acrylate into the above solution, and under constant stirring, the Raise the temperature to 48°C for a pre-emulsification reaction for 1.5 hours, then dissolve 0.35 parts of dibenzoyl peroxide in cyclohexane and add it dropwise to the above-mentioned pre-emulsification solution. Afte...
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