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A kind of vinyl amide block copolymer hydrate kinetics inhibitor and its preparation method and application

A kinetic inhibitor, vinyl amide technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of restricting large-scale production and application, the inhibitory effect is not particularly good, and the molecular weight distribution of the product is wide. Achieve controllable synthesis process, excellent inhibitory effect, and narrow molecular weight distribution

Active Publication Date: 2020-03-24
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, most of the existing polymers are prepared by ordinary free radical chain polymerization, and the synthesized copolymers are random copolymers, which have the disadvantages of uncontrollable production process, wide molecular weight distribution of the obtained products, and not particularly good inhibitory effect, etc. Restricting its large-scale production and application

Method used

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  • A kind of vinyl amide block copolymer hydrate kinetics inhibitor and its preparation method and application
  • A kind of vinyl amide block copolymer hydrate kinetics inhibitor and its preparation method and application
  • A kind of vinyl amide block copolymer hydrate kinetics inhibitor and its preparation method and application

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Effect test

Embodiment 1

[0033] Take 0.386g of anhydrous copper chloride, 0.898g of 2,2'-bipyridine, and 20g of vinylcaprolactam into a three-necked flask, and then connect the three ports of the flask with a thermometer, a condenser tube, and a rubber hole plug, and the upper end of the condenser tube is connected to the gas path . After evacuating, nitrogen gas is used to preliminarily remove the air in the pipeline. Weigh 0.236g of azobisisobutyronitrile and 90mL of dimethylformamide, dissolve the azobisisobutyronitrile in dimethylformamide, inject the flask from the hole of the rubber stopper with a syringe, and seal it. Then evacuate and circulate nitrogen for three times to ensure anaerobic operating conditions. Turn on the condensed water circulation, turn on the magnetic stirring at 300rpm, turn on the oil bath and raise the temperature to 80°C. After reacting for 40 hours, 10.214 g of acrylamide was weighed and added to the flask under nitrogen protection. Continue to react for 40 hours, t...

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Abstract

Disclosed are a vinyl amide block copolymer hydrate kinetic inhibitor and a preparation method therefor: employing the principle of reverse atom transfer radical polymerization, and under anaerobic operating conditions, using vinyl caprolactam and acrylamide as monomers, using dimethyl formamide as a solvent, using azobisisobutyronitrile as an initiator, and using a transition metal complex composed of anhydrous copper chloride and 2,2'-bipyridine as a catalytic system to achieve catalytic controlled free radical solution polymerization so as to form a poly(vinyl caprolactam-acrylamide) block copolymer hydrate kinetic inhibitor. The synthesized hydrate kinetic inhibitor has controllable molecular weight, narrow molecular weight distribution, a controllable synthesis process, a small injection amount, good solubility, may withstand a lower subcooling degree, and may lead to longer hydrate formation induction time and lower usage amount, while also having a better inhibitory effect than a conventional random copolymer such as poly(vinyl caprolactam-vinyl pyrrolidone).

Description

Technical field: [0001] The invention relates to the technical field of hydrate inhibitors, in particular to a vinylamide-based block copolymer hydrate kinetics inhibitor and its preparation method and application. Background technique: [0002] Natural gas hydrate is an ice-like cage crystal formed by natural gas and water under certain conditions. In the process of deepwater drilling in the ocean, gas hydrates are easily generated when a certain pressure and lower temperature are reached. Once natural gas complexes are formed, it is very easy to cause blockage of pipelines, affect the normal exploitation and transportation of oil and natural gas, and even lead to safety accidents in severe cases. In addition to reducing the drilling fluid column pressure as much as possible, the most common effective measure in the oil and gas industry is to inject a certain amount of gas hydrate inhibitor into the drilling fluid. The most common is a thermodynamic inhibitor, but the req...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C08F220/56C08F4/54C09K8/524
CPCC08F4/54C08F293/005C08F2438/01C08F2500/03C09K8/524C09K2208/22C08F220/56C08F226/06C08F2438/00C09K8/035C09K8/52
Inventor 龙臻丁启航梁德青
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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