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Double-effect composite hydrate inhibitor and preparation method thereof

A hydrate inhibitor and composite technology, applied in drilling compositions, chemical instruments and methods, organic chemistry, etc., can solve the problems of poor biodegradability and inability of compounds to prevent growth and aggregation, delay Effect of nucleation time and suppression cost reduction

Active Publication Date: 2017-05-31
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the biodegradability of the above-mentioned compounds is slightly poor, and they cannot play a role in some oil and gas operating environments with high supercooling and low salt concentration

Method used

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  • Double-effect composite hydrate inhibitor and preparation method thereof
  • Double-effect composite hydrate inhibitor and preparation method thereof
  • Double-effect composite hydrate inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Preparation method of double-effect compound hydrate inhibitor

[0034] The synthetic route is as follows:

[0035]

[0036] Include the following steps:

[0037] (1) Add 0.3 mol of alkylmorpholine derivatives, 0.45 mol of 2-chloroethanol, and 200 mL of acetonitrile into a 500 mL three-necked reaction flask equipped with a reflux condenser, a thermometer, a stirrer and a nitrogen inlet and outlet. Introduce nitrogen and heat to 70°C, stir and react for 48 hours; use a separatory funnel to separate the product from residual 2-chloroethanol and acetonitrile, collect and wash with acetone, and then distill under reduced pressure to further remove volatile organic impurities , drying at 45-50° C. for 24 hours under a vacuum condition of -0.08 to -0.1 MPa to obtain a hydroxylated morpholine chloride salt with a higher purity, and the yield is about 80%;

[0038] (2) Mix the hydroxylated morpholine chloride salt obtained in step (1) with 0.3 mol sodium tetrafl...

Embodiment 2

[0040] Embodiment 2: inhibition effect evaluation

[0041] Use the hydrate inhibitor performance evaluation test system to test the effect of the inhibitor, and the hydrate inhibitor performance evaluation test system includes a high-pressure reaction kettle, a buffer tank, a constant temperature water bath, a vacuum pump, a magnetic stirring system, a manual booster pump, and a gas flow meter. , gas cylinders, temperature and pressure sensors and data acquisition systems, etc. Among them, the core equipment high-pressure reactor is made of stainless steel 316 material, and the maximum working pressure can reach 25MPa. The constant temperature water bath provides -20~100°C refrigerant circulating fluid for the high pressure reactor, and the speed adjustment range of the magnetic stirring system is 0~1000r / min. The temperature in the high-pressure reactor is measured by a Pt100 platinum resistance temperature sensor, the temperature measurement accuracy is ±0.1°C, and the pres...

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PUM

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Abstract

The invention discloses a double-effect composite hydrate inhibitor which comprises hydroxylated morpholine ionic liquid, amino acid and water, wherein the structural formula of the hydroxylated morpholine ionic liquid is as shown in the specification. The composite hydrate inhibitor is high in conductivity, biodegradable, free from toxicity, environmentally friendly and efficient in inhibition performance and has double-effect inhibition performance of thermodynamics and dynamics, and hydrate formation can be effectively inhibited under low dosage concentration of 1wt%-5wt%. In the structural formula, R1 is C1-C4 alkyl substituent, R2 is ethoxyl, and X is tetrafluoroborate.

Description

[0001] Technical field: [0002] The invention relates to the field of hydrate technology, in particular to a double-effect compound hydrate inhibitor and a preparation method thereof. [0003] Background technique: [0004] In the oil and gas industry, oil and gas fluids contain hydrocarbons such as methane, ethane, propane, etc., as well as gases such as carbon dioxide, hydrogen sulfide, etc., and water will form solid hydrate crystals under certain high pressure and low temperature conditions. Once gas hydrates are formed in pipelines containing natural gas or petroleum fluids, the blockage of hydrates will affect the normal transportation of fluids, which will not only threaten the safety of drilling, completion or fracturing in the oil and gas industry, but also cause major economic losses. [0005] In order to solve the clogging problem of hydrate formation, thermodynamic inhibitors such as heating pipelines, reducing pressure, removing water, and adding alcohols such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/528C09K8/532C07D295/088
Inventor 龙臻梁德青魏伟张金华
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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