Oil well cement thixotropic agent and preparation method thereof
A technology of oil well cement and thixotropic agent, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of temperature sensitivity, weak comprehensive performance, weak thixotropy, etc., and achieve improvement of thixotropy and comprehensive performance good effect
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[0039] Example one
[0040] An oil well cement thixotropic agent provided by an embodiment of the present invention includes: ultrafine clay and amphoteric polymer, and the mass ratio of the ultrafine clay to the amphoteric polymer is 10:1.
[0041] In this embodiment, the amphoteric polymer is a quaternary copolymer synthesized by the method of aqueous radical polymerization.
[0042] Specifically, the quaternary copolymer includes: acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, acrylic acid and a cationic monomer, and acrylamide, 2-acrylamido-2-methylpropanesulfonic acid The proportion by weight of acid, acrylic acid and cationic monomer is: acrylamide 35-80 parts, 2-acrylamido-2-methylpropanesulfonic acid 10-50 parts, acrylic acid 5-15 parts, cationic monomer 5- 30 servings.
[0043] In this embodiment, the cationic monomer is dimethyl diallyl ammonium chloride, acryloxyethyl trimethyl ammonium chloride, or octadecyl dimethyl allyl ammonium chloride.
Example Embodiment
[0044] Example two
[0045] See figure 1 The method for preparing the oil well cement thixotropic agent provided in the embodiment of the present invention is used to prepare the above-mentioned oil well cement thixotropic agent, including:
[0046] Step S110: adding distilled water to the container;
[0047] Step S120: Add 10-50 parts of 2-acrylamido-2-methylpropanesulfonic acid and 5-15 parts of acrylic acid into the container, and stir to dissolve;
[0048] Step S130: Perform acid-base adjustment on the substance in the container so that the pH of the substance is between 6 and 7;
[0049] To describe this step, step S130 specifically includes:
[0050] Add sodium hydroxide solution to the container to adjust the acid and base of the material to make the pH of the material between 6 and 7.
[0051] Step S140: Add 35-80 parts of acrylamide and 5-30 parts of cationic monomer to the container, and stir to dissolve;
[0052] Specific description of the embodiment of the present invention:
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Example Embodiment
[0064] Example three
[0065] Weigh 15 parts of 2-acrylamido-2-methylpropanesulfonic acid and 5 parts of acrylic acid into a beaker with an appropriate amount of distilled water, and stir to dissolve. Then add dropwise sodium hydroxide solution to adjust the system pH=6.5, and pour it into a clean three-necked bottle. Then add 70 parts of acrylamide and 10 parts of cationic monomer, fill with nitrogen, and start stirring. After all the monomers are dissolved, the heating device is turned on to heat the mixed liquid in the three-necked flask. When the temperature of the system reaches 35°C, 0.5 part of initiator is added to initiate the polymerization reaction. After reacting for 4-6 hours in a constant temperature water bath at 50°C, a gel-like viscous substance is obtained. The synthetic gelatinous viscous substance is granulated, dried, and ground to obtain a solid granular product. The ultrafine clay and solid granular product are mixed uniformly in a mass ratio of 10:1 to ...
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