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Amide copolymer hydrate kinetic inhibitor and application thereof

A kinetic inhibitor, hydrate technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of insignificant enhancement of inhibitory performance, small controllability of molecular structure, general molecular weight distribution, etc. Wide application range and conditions, small molecular dispersion coefficient, high yield effect

Active Publication Date: 2019-05-21
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Or introduce a linear amide group to form a kinetic inhibitor by copolymerization of acrylamide, acrylonitrile and vinyl caprolactam. However, because it contains three monomers, the molecular weight distribution among the products is general, and the molecular structure is less controllable. Conditions are restricted (Patent ZL201610802031.8)
Modification of the end group of the existing vinyl caprolactam monomer, but the experimental results show that the inhibition performance enhancement effect is not obvious under the condition of high supercooling degree (patent CN107868156A)

Method used

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  • Amide copolymer hydrate kinetic inhibitor and application thereof
  • Amide copolymer hydrate kinetic inhibitor and application thereof
  • Amide copolymer hydrate kinetic inhibitor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 10.297g of vinylcaprolactam and 5.107g of N-isopropylacrylamide 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, pass nitrogen gas to initially remove the air in the pipeline. Weigh 0.308g of azobisisobutyronitrile and 100mL of N,N-dimethylformamide, dissolve azobisisobutyronitrile in dimethylformamide, inject it into 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, and turn on the oil bath at 85°C. After reacting for 12 h, the oil bath and stirring were turned off, and the solution was cooled to room temperature. The solution was rotary evaporated at 80°C until the precipitation was complete....

Embodiment 2

[0030] Same as Example 1, the difference is:

[0031] The reaction temperature is 70°C and the reaction time is 20h. Cool the reacted solution to room temperature, dry and cool at 70°C, then drop the solution into anhydrous ether, wash and dry the obtained solid to obtain the target product; vinylcaprolactam and N- The mass ratio of isopropylacrylamide is 1:1; the mass ratio of total monomer mass to azobisisobutyronitrile is 50:1, and the mass ratio of azobisisobutyronitrile to N,N-dimethylformamide The ratio is 1:100.

[0032] The characteristic peaks of the characteristic structure were characterized by Fourier transform infrared spectrum and hydrogen spectrum of nuclear magnetic resonance to determine the synthetic substance, and the molecular weight of the synthetic substance was characterized by gel permeation chromatography. It was determined that the product prepared in this example was poly(vinyl caprolactam-isopropylacrylamide), and the weight average molecular weigh...

Embodiment 3

[0034] Same as Example 1, the difference is:

[0035] The reaction temperature is 90°C and the reaction time is 6h. The reacted solution is cooled to room temperature, dried and cooled at 95°C, and the solution is dropped into anhydrous ether, and the obtained solid is washed and dried to obtain the target product; vinyl caprolactam and N- The mass ratio of isopropylacrylamide is 20:1; the mass ratio of total monomer mass to azobisisobutyronitrile is 200:1, and the mass ratio of azobisisobutyronitrile to N,N-dimethylformamide The ratio is 1:500.

[0036] The characteristic peaks of the characteristic structure were characterized by Fourier transform infrared spectrum and hydrogen spectrum of nuclear magnetic resonance to determine the synthetic substance, and the molecular weight of the synthetic substance was characterized by gel permeation chromatography. It is determined that the product prepared in this example is poly(vinyl caprolactam-isopropylacrylamide), and the weigh...

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Abstract

The invention provides an amide copolymer hydrate kinetic inhibitor and application thereof. The amide copolymer hydrate kinetic inhibitor is as shown by a formula I as shown in the specification, andhas a weight-average molecular weight of 10,000 to 90,000 and a molecular weight distribution coefficient of 1 to 3. Compared with an existing kinetic inhibitor, the amide copolymer hydrate kinetic inhibitor synthesized in the invention is simple in synthesis process and high in yield, simultaneously contains two effective inhibitor ingredients, but only has one ring-shaped structure, is controllable in molecular weight and relatively small in molecular dispersion coefficient, and has a wider use range and conditions.

Description

Technical field: [0001] The invention relates to the field of hydrate technology, in particular to an amide copolymer hydrate kinetic inhibitor and application thereof. Background technique: [0002] Natural gas hydrate is a white solid substance with extremely strong combustion power. It is mainly composed of water molecules and hydrocarbon gas molecules (mainly methane). Natural gas hydrate is formed under certain conditions (suitable temperature, pressure, gas saturation , water salinity, pH value, etc.) ice-like, non-stoichiometric, clathrate crystalline compounds formed when water and natural gas are mixed under medium-high pressure and low temperature conditions. Due to the high pressure and low temperature conditions in mining and transportation, natural gas compounds are easily formed in pipelines. Once formed, it will quickly block the pipeline, affect the normal extraction and transportation of oil and natural gas, and even lead to safety accidents in severe cases...

Claims

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Application Information

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IPC IPC(8): C08F226/06C08F220/54C09K8/52
Inventor 龙臻路智林梁德青丁启航
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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