Oil well cement sedimentation stabilizer suitable for oil and gas well cementation, preparation method thereof and cementing slurry
A cementing cement slurry and oil well cement technology, applied in the preparation of oil well cement settlement stabilizer, cementing cement slurry field, can solve the problems of poor cementing quality, difficult pumping, unstable performance of cement slurry, etc.
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[0069] In the present invention, a rigid hydrophobic monomer is developed by increasing the length of the alkyl chain in the monomer, and the rigid hydrophobic monomer is a rigid hydrophobic long-chain alkyl monomer, which can endow the The thermal viscosity-increasing ability of synthetic polymers, so the present invention utilizes allyl chloride and N, N-dimethyl long-chain alkyl tertiary amines (the number of long-chain alkyls is an even number of 14-20) to synthesize a rigid hydrophobic long-chain The alkyl-containing quaternary ammonium salt type monomer is used as a rigid hydrophobic monomer, and the specific synthesis method includes the following steps:
[0070] (1) Add fatty alcohol and an appropriate amount of catalyst into the reactor, heat the reactor, and when the temperature is 130°C, feed monomethylamine into the reactor at a flow rate of 35kg / h-50kg / h for 75-85min, and finally the reactor Keep the reaction temperature at 180-200°C, and the reaction time is 5-7h...
Embodiment 1
[0103] This embodiment is to illustrate the oil well cement settlement stabilizer prepared by the method of the present invention.
[0104] Weigh 1 part by weight of 2-acrylamido-2-methylpropanesulfonic acid, 3 parts by weight of acrylamide, and 1 part by weight of rigid hydrophobic monomer, and dissolve all three monomers in deionized water , to form a mixed solution after stirring evenly;
[0105] Wherein, the rigid hydrophobic monomer has the structure shown in formula (VI), and, R 6 is H, m is 21;
[0106]
[0107] Adding a mass fraction of 10% NaOH solution to the mixed solution to adjust the reaction system to a pH of 8.5, place the mixed solution with a good pH value in a three-necked flask, discharge the oxygen in the three-necked flask and place the three-necked flask at 50 ° C. Stirring at a constant speed of 100r / min in a water bath, until the temperature of the reaction solution rises to 50°C, slowly add successively dropwise an initiator solution with a mass ...
Embodiment 2
[0113] This embodiment is to illustrate the oil well cement settlement stabilizer prepared by the method of the present invention.
[0114] Prepare the oil well cement settlement stabilizer according to the same method as in Example 1, the difference is: take 2 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid, 3 parts by weight of acrylamide according to the weight ratio, 1 part by weight of rigid hydrophobic monomer.
[0115] As a result, the prepared oil well cement settlement stabilizer is marked as S2;
[0116] Wherein, the structure contained in the oil well cement settlement stabilizer S2 is:
[0117] [CH 2 CM 1 H] x -[CM 2 HCH 2 ] y -[CH 2 CM 3 HCl - ] z ; among them, M 1 for-CONH 2 ,M 2 for-CONHC(CH 3 ) 2 CH 2 SO 3 H, M 3 for-[NCH 2 (CH 3 ) 2 (CH 2 ) m CH 3 ] + ;
[0118] where x:y:z=1:0.22:0.055; and
[0119] The weight average molecular weight of the oil well cement settlement stabilizer S2 is 5 million.
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