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Polycyclic polymerized natural gas hydrate dynamic inhibitor and preparation method

A technology of kinetic inhibitors and synthetic natural gas, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of cost increase, sewage pollution, large dosage of thermodynamic inhibitors, etc., and achieve easy recovery and recycling Excellent effect of use, use, excellent inhibition performance

Inactive Publication Date: 2016-08-17
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] Embodiment 1: A synthetic natural gas hydrate kinetics inhibitor, the inhibitor is marked as P and consists of the following components in parts by weight: A: 40 parts of N-vinylpyrrolidone, B: 40 parts of N-vinyl caprolactam Parts, C: 10 parts of acrylamide, D: 10 parts of acrylonitrile, E: 100 parts of deionized water, F: 0.5 parts of mercaptothiol, G: 2.5 parts of ammonium persulfate solution with a specification of 10%, H: a specification of 2.5 parts of 10% sodium bisulfite.

[0026] The preparation method for preparing the above-mentioned natural gas hydrate kinetic inhibitor comprises the following steps: (a) put A, B, C and E according to the ratio in claim 1 in a three-necked flask equipped with a reflux condensing device, and place the Put the three-neck flasks A, B, C and E into a magnetic water bath, heat to keep the temperature at 50-60°C, keep stirring until A, B and C are completely dissolved, and set aside; (b) Add D to step (a) (c) Add F to the solutio...

Embodiment 2

[0027] Embodiment 2: A synthetic natural gas hydrate kinetics inhibitor, the inhibitor is labeled as P and consists of the following components in parts by weight: 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 mercaptothiol, G: 2.5 parts of ammonium persulfate solution with a specification of 10%, H: a specification of 2.5 parts of 10% sodium bisulfite.

[0028] The preparation method of the above gas hydrate kinetic inhibitor is the same as that in Example 1.

Embodiment 3

[0029] Embodiment 3: A synthetic natural gas hydrate kinetics inhibitor, the inhibitor is labeled as P and consists of the following components in parts by weight: A: 60 parts of N-vinylpyrrolidone, B: 10 parts of N-vinylcaprolactam Parts, C: 20 parts of acrylamide, D: 10 parts of acrylonitrile, E: 150 parts of deionized water, F: 1 part of mercaptothiol, G: 3 parts of ammonium persulfate solution with a specification of 10%, H: a specification of 3 parts of 10% sodium bisulfite.

[0030] The preparation method of the above gas hydrate kinetic inhibitor is the same as that in Example 1.

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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, in particular to a natural gas hydrate kinetic inhibitor and a preparation method. Background technique [0002] During natural gas exploitation, 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 turbulent flow, which is the main cause of abnormalities in natural gas production equipment and blockage of transmission pipelines, and even causes security incident. [0003] At present, the prevention and control of hydrate mainly adopts two kinds of physical methods and chemical methods. The physical method is mainly to make the oil and gas system not have the thermodynamic conditions for hydrate formation, including water removal method, heating method, depressurization method and the combined use of these methods. With the use of actual input an...

Claims

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Application Information

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Patent Type & Authority Applications(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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