Temperature-responsive high-temperature retarder suitable for oil and gas well cementing, preparation method thereof, and cementing cement slurry
A technology for cementing cement slurry and temperature response, which is used in the preparation of high-temperature retarder and cementing slurry field to achieve high early strength, reduce excessive dispersion side effects, and prolong high-temperature thickening time.
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[0046] 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 characteristics of synthetic polymer temperature response, so the present invention utilizes chloropropene and N, N-dimethyl long-chain alkyl tertiary amine (the long-chain alkyl number is an even number of 14-24) to synthesize a kind of rigid hydrophobic long-chain alkane The base contains a quaternary ammonium salt type monomer as a rigid hydrophobic monomer, and the specific synthesis method includes the following steps:
[0047] (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
[0083] This example is to illustrate the temperature-responsive high-temperature retarder prepared by the method of the present invention.
[0084] The preparation steps are as follows:
[0085] (1) Weigh 51.75 parts of 2-acrylamide-2-methylpropanesulfonic acid (monomer B), 21.6 parts of acrylic acid (monomer A), 6 parts of hydrophobic monomer (monomer C), and use deionized Dissolved in water, the total mass concentration of monomers in the solution is 25%, and the pH value is adjusted to 6 by a sodium hydroxide solution with a concentration of 5 mol / L;
[0086] Wherein, the rigid hydrophobic monomer has the structure shown in formula (VI), and, R 6 is H, n is 21;
[0087]
[0088] (2) Adjust the temperature of the water bath to 55° C., and install the reaction device. Transfer the mixed solution of 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, and hydrophobic monomer into a three-necked flask, stir with a magnetic stirrer at a speed of 500 rpm, and pass nitro...
Embodiment 2
[0095] This example is to illustrate the temperature-responsive high-temperature retarder prepared by the method of the present invention.
[0096] Prepare the high-temperature retarder according to the same method as in Example 1, the difference is: take 2-acrylamide-2-methylpropanesulfonic acid (monomer B), acrylic acid (monomer A) according to the weight ratio and a hydrophobic monomer (monomer C).
[0097] As a result, the prepared high-temperature retarder is marked as S2.
[0098]Wherein, the structure contained in the high temperature retarder S2 is:
[0099] [CH 2 CM 1 H] x -[CM 2 HCH 2 ] y -[CH 2 CM 3 HCl - ] z ; among them, M 1 for-COOH, M 2 for-CONHC(CH 3 ) 2 CH 2 SO 3 H, M 3 for-[NCH 2 (CH 3 ) 2 (CH 2 ) n CH 3 ] + ;
[0100] Wherein, x=39.45%, y=59.17%, z=1.38%; and
[0101] The weight average molecular weight of the high temperature retarder S2 is 150,000.
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