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High-efficiency composite hydrate inhibitor as well as preparation method and application thereof

A hydrate inhibitor and composite technology, which is applied in mechanical equipment, gas/liquid distribution and storage, pipeline systems, etc., can solve the problems of energy consumption, time consumption, uneconomical and other problems, and achieve long suppression time, cost reduction, chemical Good stability and thermal stability

Active Publication Date: 2011-08-24
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When PVP is applied to hydrate inhibition, measures such as stirring and heating must be used to promote its dissolution, which is an energy-consuming, time-consuming and uneconomical process

Method used

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  • High-efficiency composite hydrate inhibitor as well as preparation method and application thereof
  • High-efficiency composite hydrate inhibitor as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Preparation of compound hydrate inhibitor

[0042] By N-vinylpyrrolidone (NVP) and diethylene glycol monobutyl ether according to the volume ratio of 1:2, the amount of initiator is 1.5% of the mass of NVP, carry out free radical solution polymerization reaction at 60 ° C, and react for 6 hours to obtain a composite Type hydrate inhibitor, wherein, the mass content of PVP is about 35%, the mass content of the synergistic solvent is about 65%, the initiator is completely decomposed, and there is no initiator in the product; it is proved by infrared spectroscopy that the pyrrolidone -C=O stretching vibration at 1660cm -1 , the C-H stretching vibration appears at 2950cm -1 , it can be determined as the target PVP.

[0043] 2. Add the composite hydrate inhibitor prepared above to a 19 wt% THF solution at a mass concentration of 2%, to prepare a reaction solution with a total mass of 40 g. Under normal pressure, the reaction temperature was maintained at -4.0°C, and hy...

Embodiment 2

[0045] 1. Preparation of compound hydrate inhibitor

[0046] By N-vinylpyrrolidone (NVP) and ethylene glycol butyl ether according to the volume ratio of 1:2, the amount of initiator is 1.0% of the mass of NVP, carry out free radical solution polymerization at 60 ° C, react for 8 hours, and obtain a composite hydration Inhibitors, wherein, the mass content of PVP is about 37%, the mass content of the synergistic solvent is about 63%, the initiator is completely decomposed and reacted, and there is no initiator in the product. Infrared spectroscopy proves that the -C=O stretching vibration of pyrrolidone is at 1660cm -1 , the C-H stretching vibration appears at 2950cm -1 , it can be determined as the target PVP.

[0047] 2. Add the composite hydrate inhibitor prepared above to a 19 wt% THF solution at a mass concentration of 2%, to prepare a reaction solution with a total mass of 40 g. Under normal pressure, the reaction temperature was maintained at -4.0°C, and hydrate was ...

Embodiment 3

[0049] 1. Preparation of compound hydrate inhibitor

[0050] By N-vinylpyrrolidone (NVP) and methanol according to the volume ratio of 1:4, the amount of initiator is 0.3% of the mass of NVP, carry out free radical solution polymerization at 60 ° C, and react for 10 hours to obtain a composite hydrate inhibitor. Wherein, the mass content of PVP is about 25%, the mass content of the solvent having a synergistic effect is about 75%, the initiator is completely decomposed, and there is no initiator in the product. Infrared spectroscopy proves that the -C=O stretching vibration of pyrrolidone is at 1660cm -1 , the C-H stretching vibration appears at 2950cm -1 , it can be determined as the target PVP.

[0051] 2. Add the composite hydrate inhibitor prepared above to a 19wt% THF solution at a mass concentration of 2%, and then add 4g of methanol to prepare a reaction solution with a total mass of 40g. Under normal pressure, the reaction temperature was maintained at -2.0°C, and n...

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Abstract

The invention discloses a high-efficiency composite hydrate inhibitor as well as a preparation method and an application thereof. The preparation method of the high-efficiency composite hydrate inhibitor comprises the following steps: taking N-vinyl pyrrolidone as a monomer and azodiisobutyronitrile or benzoyl peroxide as an initiator; and carrying out a polymerization reaction of a free-radical solution in a solvent to obtain the composite hydrate inhibitor, wherein the solvent is selected from at least one of the following components: carbinol, ethylene glycol, diethylene glycol, isopropanol, diethylene glycol, ethylene glycol monobutyl ether and Di(ethylene glycol) butyl ether, the volume ratio of the monomer to the solvent is (1:2)-(1:5), and the use amount of the initiator is 0.3-1.5wt% of the monomer. Compared with the method for industrially synthesizing the initiator, the method disclosed by the invention saves energy and is convenient and economic. The inhibitor synthesized by the invention can be applied to hydrate prevention and treatment in the processes of producing and transporting petroleum fluid.

Description

technical field [0001] The invention relates to a high-efficiency composite hydrate inhibitor, a preparation method and application thereof. Background technique [0002] During the extraction and transportation of oil and natural gas, various low-boiling hydrocarbons such as methane, ethane, propane, carbon dioxide, and hydrogen sulfide can easily form gas hydrates with water in petroleum fluids due to their special high-pressure and low-temperature environments. . This kind of gas hydrate is composed of water molecules connected by hydrogen bonds to form a cage structure, and small gas molecules are surrounded in the lattice by van der Waals force, which appears as ice-snow crystals macroscopically. This clathrate hydrate gathers together under certain conditions to form a block, and in severe cases, it will block equipment such as pipelines, wellbores, valves, and instruments, and bring great difficulties to the extraction, transportation, and processing of oil and natur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F126/10C08F2/06F17D1/08F17D1/02
Inventor 樊栓狮郎雪梅李清平王燕鸿李斯佳胡军姚海元庞维新程兵王涛李支文程艳
Owner CHINA NAT OFFSHORE OIL CORP
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