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A polycyclic polymerization natural gas hydrate kinetic inhibitor and its preparation method

A kinetic inhibitor, a technology for synthesizing natural gas, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as increased cost, large dosage of thermodynamic inhibitor, environmental pollution by sewage, etc., and achieves easy recovery and recycling. Use, suppress performance, use the effect of excellent effect

Inactive Publication Date: 2018-02-16
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Hydrate thermodynamic inhibitors (soluble alcohols such as methanol, ethanol, ethylene glycol, inorganic salts, etc.) are often used in the actual generation of oil and gas industry, but the dosage of thermodynamic inhibitors is large, resulting in huge storage and injection equipment, increased production costs, and Produce a large amount of sewage to pollute the environment and increase the cost of application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: A synthetic natural gas hydrate kinetic inhibitor, the inhibitor labeled P is composed of the following components in parts by weight ratio: A: 40 parts of N-vinylpyrrolidone, B: 40 parts of N-vinylcaprolactam Parts, C: 10 parts of acrylamide, D: 10 parts of acrylonitrile, E: 100 parts of deionized water, F: 0.5 parts of mercapto mercaptan, G: 2.5 parts of 10% ammonium persulfate solution, H: specifications of 2.5 parts of 10% sodium bisulfite.

[0026] The method for preparing the natural gas hydrate kinetic inhibitor includes the following steps: (a) Put A, B, C, and E in a three-necked flask equipped with a reflux condenser device in accordance with the proportions in claim 1, and put them in Put the three-necked flasks with A, B, C and E into a magnetic water bath, heat to keep the temperature at 50~60℃, keep stirring until A, B and C are completely dissolved, and set aside; (b) add D to step (a) In the solution prepared in step (b), stir until it is evenly...

Embodiment 2

[0027] Example 2: A synthetic natural gas hydrate kinetic inhibitor, the inhibitor labeled P is composed of the following components in parts by weight ratio: A: 50 parts of N-vinylpyrrolidone, B: 30 parts of N-vinylcaprolactam Parts, C: 10 parts of acrylamide, D: 10 parts of acrylonitrile, E: 100 parts of deionized water, F: 0.5 parts of mercapto mercaptan, G: 2.5 parts of 10% ammonium persulfate solution, H: specifications of 2.5 parts of 10% sodium bisulfite.

[0028] The preparation method for preparing the above natural gas hydrate kinetic inhibitor is the same as in Example 1.

Embodiment 3

[0029] Example 3: A synthetic natural gas hydrate kinetic inhibitor, the inhibitor labeled P is composed of the following components in parts by weight ratio: A: 60 parts of N-vinylpyrrolidone, B: N-vinylcaprolactam 10 Parts, C: 20 parts of acrylamide, D: 10 parts of acrylonitrile, E: 150 parts of deionized water, F: 1 part of mercapto mercaptan, G: 3 parts of 10% ammonium persulfate solution, H: specifications of 3 parts of 10% sodium bisulfite.

[0030] The preparation method for preparing the above natural gas hydrate kinetic inhibitor is the same as in Example 1.

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PUM

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Abstract

The invention belongs to the technical field of preparation of chemical reagents, particularly relates to a polycyclic polymerized natural gas hydrate dynamic inhibitor and a preparation method. N-vinyl pyrrolidone (NVP), N-vinyl caprolactam (NVCL), acrylamide (AM) and acrylonitrile (AN) are used as synthesizing monomers, ammonium persulfate and sodium bisulfite are used as initiators, free radical solution polymerization reaction is performed in a solvent to obtain the hydrate inhibitor, wherein the monomers include, by mass, NVP 40-70%, NVCL 10-40%, AM 5-20% and AN 5-10%, the initiators account for 0.3% of the total mass of the monomers, and the mass ratio of the two initiators is 1 to 1. The mass ratio of the synthesized hydrate inhibitor to ethylene glycol is 1.5:80 to 2:80, and the best inhibition performance is obtained through compatibility. The synthesized inhibitor reduces the hydrate generation temperature to a greater degree, prolongs the induction time and is suitable for recovery and delivery of oil and gas fields. The polycyclic polymerized natural gas hydrate dynamic inhibitor is quick and convenient to synthesize, low in cost, easy to biodegrade and wide in application prospect.

Description

Technical field [0001] The invention belongs to the technical field of preparation of chemical reagents, and particularly relates to a natural gas hydrate kinetic inhibitor and a preparation method. Background technique [0002] In the process of natural gas extraction, gathering, transportation, and processing, due to changes in temperature, pressure, flow velocity, etc., natural gas hydrates are often formed at low temperature and high pressure turbulence. This is the main cause of abnormal natural gas production equipment and blockage of transmission pipelines, and even causes Security incident. [0003] At present, the prevention and control of hydrates are mainly through physical and chemical methods. The physical method is mainly to make the oil and gas system not have the thermodynamic conditions for the formation of hydrates. There are water removal method, heating method, pressure reduction method and the combined use of these methods. With the actual use of production, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F226/10C08F226/06C08F220/56C08F220/44C09K8/524
CPCC08F226/06C08F226/10C09K8/524C09K8/882C09K2208/22C08F220/56C08F220/44
Inventor 马喜平胡莹莹谢京豫焦文超赵梦婕周有祯许帅石伟朱忠祥
Owner SOUTHWEST PETROLEUM UNIV
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