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Combined hydrate inhibitor

A technology of hydrate inhibitor and composite inhibitor, which is applied in drilling compositions, pipeline systems, chemical instruments and methods, etc., can solve the problems of limited application occasions, limited dispersion performance, hydrate eruption, etc. Friendly, good inhibitory effect, high inhibitory activity

Inactive Publication Date: 2015-03-04
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But its cost is high, and there are great limitations, because the formation of hydrate does not absolutely require the existence of free water phase, if the hydrate crystal nucleus or free water is adsorbed on the wall, although the water concentration in the liquid hydrocarbon phase Very low, hydrates can also grow from the liquid hydrocarbon phase
[0005] (2) Heating method, that is, heating at the blocked position of the pipeline to make the temperature of the pipeline higher than the hydrate formation temperature, but this is likely to cause pipeline rupture or even hydrate eruption, and the water produced by hydrate decomposition must be removed, otherwise it will form again Hydrate
Polymerization inhibitors can be used at a higher subcooling degree than kinetic inhibitors, but their dispersion performance is limited, and they can only work when there is an oil phase, which has a great relationship with the oil-gas system, so the application is limited

Method used

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Effect test

Embodiment 1

[0039] A combined hydrate inhibitor, comprising 0.05% PVCap with a weight-average molecular weight of 900 to 40,000 and 0.05% 1-ethyl-3-methylimidazolium tetrafluoroborate ([C 2 min]BF 4 ) and water, and the combined hydrate inhibitor was configured as a composite aqueous solution with a mass concentration of 0.1% and added to the reactor. The experimental procedure was the same as above. The results showed that the induction time of hydrate formation under this system was 12 minutes. The reaction completion time is 105 minutes, and the pressure drop in the reaction is 1.39MPa, which has a good inhibitory effect.

Embodiment 2

[0041] A combined hydrate inhibitor, comprising PVCap with a mass concentration of 0.5% weight-average molecular weight of 900 to 40000, 0.05% 1-ethyl-3-methylimidazolium tetrafluoroborate ([C 2 min]BF 4 ) and water, and the combined hydrate inhibitor was configured into a composite aqueous solution with a mass concentration of 0.55% and added to the reactor. The experimental procedure was the same as above. The results showed that the induction time of hydrate formation under this system was 39 minutes. The completion time of the reaction was 151 minutes, and the pressure drop in the reaction was 1.25 MPa, which had a good inhibitory effect.

Embodiment 3

[0043] A combined hydrate inhibitor, comprising 0.5% PVCap with a weight-average molecular weight of 900 to 40,000 and 0.5% 1-ethyl-3-methylimidazolium tetrafluoroborate ([C 2 min]BF 4 ) and water, the combined hydrate inhibitor is configured into a composite aqueous solution with a mass concentration of 1.0% and added to the reactor. The experimental procedure is the same as above. The results show that the induction time of hydrate formation under this system is 88min, and the reaction time is 88 minutes. The completion time is 259min, and the pressure drop in the reaction is 1.0MPa, which has a good inhibitory effect.

[0044] Comparing Example 3 with Comparative Examples 1 and 4, it can be seen that the combined use of the kinetic inhibitor PVCap and imidazolium ionic liquid can reduce the influence of the inhibitor on the degree of supercooling and produce a better inhibitory effect: the induction time of the hydrate is prolonged , the reaction takes longer to complete a...

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Abstract

The invention discloses a combined hydrate inhibitor, prepared by mixing a dynamics inhibitor, ionic liquid and water, wherein in percentage by mass, the mass concentration of the dynamics inhibitor is between 0.05% and 5% and the mass concentration of the ionic liquid is between 0.05% and 5%. The combined hydrate inhibitor is applicable to an oil-gas-water three-phase coexisting system or an oil-water or gas-water two-phase coexisting system, is used for inhibiting the generation of hydrates in exploitation, processing and transportation of oil and gas, and can achieve good inhibiting effect with a small use amount, thus reducing the cost; in addition, the combined hydrate inhibitor is friendly to the environment and has a wide prospect.

Description

Technical field: [0001] The invention relates to the technical field of chemical industry, in particular to a combined hydrate inhibitor. Background technique: [0002] Natural gas hydrate is an ice-like crystal hydrate formed by natural gas and water under certain temperature and pressure conditions. During the extraction, processing and transportation of oil and natural gas, due to the existence of low temperature and high pressure, hydrates are easily formed in pipelines. Once hydrates are formed, the viscosity of the fluid will increase, the flow area of ​​the pipeline will decrease, and throttling will be formed, which will further accelerate the formation of hydrates, block wellbores, pipelines, valves and other equipment, thereby affecting normal industrial production and operation, and bringing huge losses to the oil and gas industry. Economic losses. Especially for the exploitation of deep sea oil and gas fields, the conditions of deep water low temperature and st...

Claims

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Application Information

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IPC IPC(8): C09K8/524F17D1/17
CPCC09K8/524C09K2208/22F17D1/17
Inventor 龙臻梁德青周雪冰李栋梁
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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