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Enhanced compound natural gas hydrate inhibitor

A hydrate inhibitor and natural gas technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of low concentration, limited dispersion performance of polymerization inhibitors, and limited application occasions, so as to reduce environmental pollution effects of harm, increased suppression, and reduced suppression costs

Active Publication Date: 2016-05-04
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

Inhibitors are generally surfactants or polymers, and the added concentration is also very low (<1wt%), which will not change the conditions for hydrate formation, but will control the particle size of hydrate, prevent particle aggregation and deposition, and make it dominant in the The fluid is transported in the form of a slurry to achieve safe fluid transport, but the dispersion performance of the polymerization inhibitor is limited, and it can only work when there is an oil phase, and the application is limited

Method used

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  • Enhanced compound natural gas hydrate inhibitor
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  • Enhanced compound natural gas hydrate inhibitor

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 1-Ethyl-3-methylimidazolium tetrafluoroborate ([Emim][BF 4 ]) and ethanol (EG) according to the mass ratio of 1:1 to prepare a mass concentration of 1% complex hydrate inhibitor aqueous solution. Put it into the reaction kettle, the experimental pressure is 10MPa, the experimental temperature is 276.15K, and the above experimental steps are followed.

[0032] The results show that the temperature rises and the pressure drops in the system at 4.9 hours, indicating that hydrates were formed at the above time (the formation of hydrates is an exothermic and gas-consuming process), but the stirring did not stop within 24 hours of the experiment . It shows that the 1% compound hydrate inhibitor has obvious hydrate inhibition effect and can withstand the supercooling degree above 15°C.

Embodiment 2

[0034] 1-Ethyl-3-methylimidazolium tetrafluoroborate ([Emim][BF 4 ]) and ethanol (EG) according to the mass ratio of 1:10 to prepare a mass concentration of 5.5% complex hydrate inhibitor aqueous solution. Put it into the reaction kettle, the experimental pressure is 10MPa, the experimental temperature is 276.15K, and the above experimental steps are followed.

[0035] The results show that the temperature rises and the pressure drops in the system at 9.5 hours, indicating that hydrates were formed at the above time (the formation of hydrates is an exothermic and gas-consuming process), but the stirring did not stop within 24 hours of the experiment . It shows that the 5.5% compound hydrate inhibitor has obvious hydrate inhibition effect and can withstand the supercooling degree above 15°C.

Embodiment 3

[0037] 1-Ethyl-3-methylimidazolium tetrafluoroborate ([Emim][BF 4 ]) and ethylene glycol ether (EGEE) according to the mass ratio of 1:10 to prepare a mass concentration of 5.5% complex hydrate inhibitor aqueous solution. Put it into the reaction kettle, the experimental pressure is 10MPa, the experimental temperature is 276.15K, and the above experimental steps are followed.

[0038] The results show that the temperature rises and the pressure drops in the system at 11.7 hours, indicating that hydrates were formed at the above time (the formation of hydrates is an exothermic and gas-consuming process), but the stirring did not stop within 24 hours of the experiment . It shows that the 5.5% compound hydrate inhibitor has obvious hydrate inhibition effect and can withstand the supercooling degree above 15°C.

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Abstract

The invention relates to an enhanced compound natural gas hydrate inhibitor. The inhibitor comprises alkyl imidazole ionic liquid, an assistant and water, wherein the alkyl imidazole ionic liquid has a structural formula as shown in the specification, alkyl substituent R1 is ethyl or butyl, R3 is methyl, R2, R4 and R5 are H, and X<-> is one of tetrafluoroborate, methyl sulfate and ethyl sulfate. The alkyl imidazole ionic liquid has the characteristic of anion / cation adjustability, and the polarity and hydrophilcity / lipophilicity of the alkyl imidazole ionic liquid can be adjusted, so that the compound inhibitor is suitable for oil-gas-water three-phase or oil-water or gas-water two-phase coexistent system, and can be compounded with the assistant to further improve the hydrate inhibiting performance; and under a condition of high supercooling degree, compared with a common alcohol or sodium chloride thermodynamic inhibitor having a mass concentration of 20-60 percent, the inhibitor has the advantages that the requirement can be met under low-usage (1-10 percent), the inhibition cost can be greatly reduced, and hazard to the environment can be reduced.

Description

technical field [0001] The invention belongs to the technical field of deep-water oil and gas transportation, and in particular relates to an enhanced composite natural gas hydrate inhibitor. Background technique [0002] Natural gas hydrate is an ice-like cage compound formed by natural gas and water under low temperature and high pressure conditions. During the exploitation, processing and transportation of deepwater oil and gas in the ocean, due to the low seabed temperature and high pressure, hydrates are easily produced. The formed hydrate grows and accumulates rapidly, and to a certain extent, it will cause blockage of pipelines and equipment, affect the flow of oil and gas, and cause serious accidents, resulting in huge economic losses. For example, an oil well explosion occurred in the US Gulf of Mexico due to hydrate blockage of pipelines ACCIDENT. Therefore, the prevention and control of hydrates has become a factor that must be considered in the safe operation o...

Claims

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Application Information

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IPC IPC(8): C09K8/524
CPCC09K8/524C09K2208/22
Inventor 龙臻梁德青何勇周雪冰
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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