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High-efficiency combined hydrate inhibitor

A hydrate inhibitor and combined use technology, which is applied in the field of high-efficiency combined use type hydrate inhibitor, can solve the problems of large addition amount and poor inhibition performance, and achieves preventing the accumulation of hydrate particles, solving the problem of flow safety, and achieving good application. Foreground effect

Active Publication Date: 2018-04-24
CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 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 high-efficiency combined hydrate inhibitor and hydrate accumulation inhibitor. The method is suitable for oil-gas-water multiphase mixed transportation system, and has the characteristics of low dosage, economical and environmental protection, and excellent suppression performance.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0047] The high-efficiency combined hydrate inhibitor provided in this example is obtained by mixing polyvinylpyrrolidone, Span20 and lauryl betaine in a mass ratio of 1:1:1.

[0048] The present embodiment uses the described high-pressure sapphire reactor for evaluation. The oil-water system in the reactor is composed of 1.5ml deionized water and 13.5ml of -20# diesel oil, that is, the oil-water system with a water content of 10vol%. The addition amount of the type hydrate inhibitor is 2.0% of the water mass in the system, and the experimental gas composition introduced is shown in Table 1.

[0049] During the experiment in this example, it was found that the hydrate particles were evenly dispersed in the oil phase, without deposition and clogging, and the stirrer in the reactor could move up and down freely; after stopping the stirring for 12 hours, it could still be restarted smoothly without deposition, thus indicating that The inhibitor provided in this example has good i...

Embodiment 2

[0051] The high-efficiency combined hydrate inhibitor provided in this example is obtained by mixing polyvinylpyrrolidone, Span20 and lauryl betaine in a mass ratio of 2:1:1.

[0052] The present embodiment uses the described high-pressure sapphire reactor for evaluation. The oil-water system in the reactor is composed of 1.5ml deionized water and 13.5ml of -20# diesel oil, that is, the oil-water system with a water content of 10vol%. The addition amount of the type hydrate inhibitor is 2.0% of the water mass in the system, and the experimental gas composition introduced is shown in Table 1.

[0053] In the experimental process of this example, it was found that throughout the experimental process, the hydrate particles were evenly dispersed in the oil phase, no deposition and clogging occurred, and the stirring bar of the reactor could move up and down freely; after stopping stirring for 12 hours, it could still be restarted smoothly. There is no deposition, which shows that ...

Embodiment 3

[0055] The high-efficiency combined hydrate inhibitor provided in this example is obtained by mixing polyvinylpyrrolidone, Span20 and lauryl betaine in a mass ratio of 1:1:1.

[0056] 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.

[0057] In the experimental process of this example, it was found that throughout the experimental process, the hydrate particles were evenly dispersed in the oil phase, no deposition and clogging occurred, and the stirring bar of the reactor could move up and down freely; after stopping stirring for 12 hours, it could still be restarted smoothly. There is no deposition, which shows that the inhibitor provided ...

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Abstract

The invention discloses an efficient combination type hydrate inhibitor which is formed by mixing a copolymer, an emulsifying agent and a particle dispersing agent. The copolymer is a mixture made of one or more of polyvinylpyrrolidone, polyethylene caprolactam and polymethylacrylic acid dimethyl amino ethyl ester. The emulsifying agent is a polyhydric alcohol type non-ionic surfactant. The particle dispersing agent is a glycine betaine type zwitterionic surfactant. The copolymer with dynamics inhibition performance is compounded with the emulsifying agent and the particle dispersing agent, hydrate particle nucleation and growth can be restrained, and the purpose of dispersing hydrate particles can be achieved. Hydrate nucleation and growth can be effectively restrained and delayed, and the purpose of well preventing hydrate particle accumulation can be achieved, so that the flow safety of an oil-gas-water three-phase mixed transportation pipeline is effectively ensured, the defects existing when traditional thermodynamics and hydrate dynamics are independently used with a hydrate anti-polymeric agent are well overcome, and the application prospect is good.

Description

technical field [0001] The invention relates to a hydrate inhibitor, in particular to a high-efficiency combined hydrate inhibitor used in the technical field of oil and gas transportation. Background technique [0002] Gas hydrate is an ice-like cage compound formed by water and gas molecules under certain conditions. The discovery of hydrate has a history of more than 200 years. As early as 1778, British philosopher and naturalist Joseph Priestley accidentally discovered SO 2 Hydrate; Then in 1810, Humphrey Davy, a scholar of the Royal Society of England, synthesized chlorine gas hydrate for the first time in the laboratory and proposed the concept of gas hydrate in the following year. However, these discoveries did not attract people's attention at the time. It was not until 1934 that the American chemist Hammerschmidt discovered that the real cause of gas pipeline blockage was not the formation of ice, but natural gas hydrate. Since then, many scholars have conducted r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D1/16C09K8/524C08L39/06C08K5/19C08K5/103C08L39/04C08L33/14
Inventor 闫柯乐张红星邹兵孙长宇尚祖政姜素霞
Owner CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG
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