Heat viscosity increasing settling stabilizer for oil well cement paste, preparation method thereof and application
A technology of oil well cement slurry and stabilizer, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of increased settlement stability, stabilizer does not have thermal viscosity-increasing characteristics, and cannot solve the problem of high-temperature cementing slurry Settlement instability problems and other problems, to achieve the effect of solving settlement instability
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Embodiment 1
[0069] A thermal viscosity-increasing settlement stabilizer suitable for oil well cement slurry, the settlement stabilizer has a structure shown in formula (II):
[0070] [C 6 h 7 o 2 (OH) 2 O-CH 2 CH 2 -OH] m -[C 6 h 7 o 2 (OH) 2 O-CH 2 CH 2 -O-C 12 h 25 ] n (II).
[0071] In formula (II), m:n=1:0.02, m+n=an integer of 200-250.
[0072] The preparation steps are as follows:
[0073] (1) Prepare 100 parts of sodium hydroxide solution with a mass fraction of 20%, pour it into a closed reaction vessel, and keep it at a constant temperature after being heated to 75°C; add 25 parts of high-purity cellulose to the reaction vessel, and magnetically stir Until the cellulose is completely dissolved, a uniform transparent viscous solution is finally obtained.
[0074] (2) Add 7 parts of sodium chloride solids to the above-mentioned uniform transparent viscous solution, at this moment a certain amount of macromolecular cellulose precipitates out from the solution, and...
Embodiment 2
[0079] A thermal viscosity-increasing settlement stabilizer suitable for oil well cement slurry, the settlement stabilizer has a structure shown in formula (III):
[0080] [C 6 h 7 o 2 (OH) 2 O-CH 2 CH 2 -OH] m -[C 6 h 7 o 2 (OH) 2 O-CH 2 CH 2 -O-C 13 h 27 ] n (III).
[0081] In formula (III), m:n=1:0.02, m+n=an integer of 250-300.
[0082] The preparation steps are as follows:
[0083] (1) Prepare 100 parts of sodium hydroxide solution with a mass fraction of 15%, pour it into a closed reaction vessel, and keep it at a constant temperature after being heated to 70°C; add 25 parts of high-purity cellulose to the reaction vessel, and magnetically stir Until the cellulose is completely dissolved, a uniform transparent viscous solution is finally obtained.
[0084] (2) Add 6 parts of sodium chloride solids in the above-mentioned homogeneous transparent viscous solution, at this moment a certain amount of macromolecular cellulose precipitates out from the solu...
Embodiment 3
[0089] A thermal viscosity-increasing settlement stabilizer suitable for oil well cement slurry, the settlement stabilizer has a structure shown in formula (IV):
[0090] [C 6 h 7 o 2 (OH) 2 O-CH 2 CH 2 -OH] m -[C 6 h 7 o 2 (OH) 2 O-CH 2 CH 2 -O-C 14 h 29 ] n (IV).
[0091] In formula (IV), m:n=1:0.025, m+n=an integer of 250-300.
[0092] The preparation steps are as follows:
[0093] (1) Prepare 100 parts of sodium hydroxide solution with a mass fraction of 25%, pour it into an airtight reaction vessel, and keep it at a constant temperature after being heated to 80°C; add 30 parts of high-purity cellulose to the reaction vessel, and magnetically stir Until the cellulose is completely dissolved, a uniform transparent viscous solution is finally obtained.
[0094] (2) Add 8 parts of sodium chloride solids in the above-mentioned homogeneous transparent viscous solution, at this moment a certain amount of macromolecular cellulose precipitates out from the sol...
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