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A compound hydrate inhibitor

A hydrate inhibitor, compound technology, applied in gas/liquid distribution and storage, pipeline systems, mechanical equipment, etc., can solve the problems of poor inhibition performance and high addition amount, and achieve excellent performance, low dosage, good The effect of the application foreground

Active Publication Date: 2018-05-18
CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of high addition amount and poor inhibitory performance of current hydrate inhibitors, the present invention combines the advantages of kinetic inhibitors and hydrate polymerization inhibitors to provide a compound hydrate inhibitor and a method for inhibiting hydrate accumulation , suitable for oil-gas-water multi-phase mixed transportation system, with the characteristics of low dosage, economical and environmental protection, excellent inhibition performance, etc.

Method used

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  • A compound hydrate inhibitor
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Examples

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Embodiment 1

[0050] This example provides a compound hydrate inhibitor, which consists of polyol type nonionic surfactant Span20, PVP (polyvinylpyrrolidone) and TBAB (tetrabutylammonium bromide) in a ratio of 1:1:1 Than mixed to get.

[0051] This embodiment uses the high-pressure sapphire reactor for evaluation. The oil-water system in the reactor is composed of 3.0ml deionized water and 12ml of -20# diesel oil, that is, the oil-water system with a water content of 20vol%. The addition amount of type hydrate inhibitor is 2.0% of the water mass in the system, and the experimental gas composition introduced is shown in Table 1.

[0052] During the experiment of this example, it was found that the induction time and growth time of hydrate formation could reach 40 minutes and 150 minutes respectively. During the whole experiment, the hydrate particles were evenly dispersed in the oil phase, and no hydrate accumulation occurred after 12 hours of continuous operation. In the case of agglomerat...

Embodiment 2

[0054] This example provides a compound hydrate inhibitor, which consists of polyol-type nonionic surfactant Span20, PVP (polyvinylpyrrolidone) and TBAB (tetrabutylammonium bromide) in a mass ratio of 2:1:1 Than mixed to get.

[0055] This embodiment uses the high-pressure sapphire reactor for evaluation. The oil-water system in the reactor is composed of 3.0ml deionized water and 12ml of -20# diesel oil, that is, the oil-water system with a water content of 20vol%. The addition amount of type hydrate inhibitor is 2.0% of the water mass in the system, and the experimental gas composition introduced is shown in Table 1.

[0056] During the experiment of this example, it was found that the induction time and growth time of hydrate formation could reach 72 minutes and 300 minutes respectively. During the whole experiment, the hydrate particles were evenly dispersed in the oil phase, and no hydrate accumulation occurred after 12 hours of continuous operation. In the case of agglo...

Embodiment 3

[0058] This example provides a compound hydrate inhibitor, which consists of polyol type nonionic surfactant Span40, PVP (polyvinylpyrrolidone) and TBAB (tetrabutylammonium bromide) in a ratio of 1:1:1 Than mixed to get.

[0059] This embodiment uses the high-pressure sapphire reactor for evaluation. The oil-water system in the reactor is composed of 3.0ml deionized water and 12ml of -20# diesel oil, that is, the oil-water system with a water content of 20vol%. The addition amount of type hydrate inhibitor is 2.0% of the water mass in the system, and the experimental gas composition introduced is shown in Table 1.

[0060] During the experiment of this example, it was found that the induction time and growth time of hydrate formation could reach 39 minutes and 194 minutes respectively. During the whole experiment process, the hydrate particles were uniformly dispersed in the oil phase, and no hydrate accumulation occurred after 12 hours of continuous operation. In the case of...

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Abstract

A compound hydrate inhibitor, which is made by mixing a copolymer, an emulsifier and a dispersant. The copolymer is made of polyvinylpyrrolidone, polyvinyl caprolactam, polymethacrylic acid and dimethylaminoethyl ester One or more mixtures; the emulsifier is a polyol type nonionic surfactant; the dispersant is a quaternary ammonium compound. Copolymers with kinetic inhibition properties are compounded with emulsifiers and dispersants, which can not only inhibit the nucleation and growth of hydrate particles, but also serve the purpose of dispersing hydrate particles; the above inhibitors can effectively inhibit and delay hydration The nucleation and growth rate of hydrates can be controlled, and the accumulation of hydrate particles can be well prevented, thus effectively solving the flow safety problem of the oil-gas-water three-phase mixed pipeline. The compounded polymerization inhibitor provided by the invention also has the advantages of low dosage, economical and environmental protection, high efficiency, excellent performance, etc., and has good application prospects.

Description

technical field [0001] The invention relates to a hydrate inhibitor, in particular to a compound hydrate inhibitor. Background technique [0002] Similar to the structure of ice crystals, gas hydrates are composed of some low-boiling hydrocarbon gas molecules such as CH 4 、C 2 h 6 , CO 2 and H 2 S, etc., are non-stoichiometric crystal cage substances formed with water molecules under low temperature and high pressure conditions. The water molecules forming hydrates are called hosts, and the gas molecules are called guests. In the process of oil and gas field development and gathering and transportation, due to its special high pressure and low temperature environment, crystal hydrates are easily formed in valves, elbows, instruments, connectors and other parts, resulting in production reduction, shutdown or even pipeline rupture, resulting in oil and gas leakage and pollution of the environment . Therefore, the research on gas hydrate risk prevention and control techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D1/17
Inventor 闫柯乐陈光进张红星邹兵吴京峰姜素霞
Owner CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG
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