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Hydrate dynamic inhibitor

A kinetic inhibitor and hydrate technology, which is applied in the field of oil field chemistry and oil and gas field development, can solve the problems of not widely popularized and adopted, expensive, and not verified in practice, and achieve low price of chemicals, low viscosity vapor pressure, low steam pressure effect

Inactive Publication Date: 2012-02-01
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, some domestic research institutes have also conducted research on some non-toxic, low-pollution, high-efficiency kinetic inhibitors, as described in patent CN101629071, a hydrate inhibitor developed by the Guangzhou Institute of Energy Research, Chinese Academy of Sciences. Although it has many advantages, it is currently not widely used in the natural gas development industry because imported agents are more expensive than thermodynamic inhibitors such as methanol.

Method used

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  • Hydrate dynamic inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: A group of formation water and a mixture of polyvinyl caprolactam and N,N-dimethylformamide with a mass ratio of 1:1 were put into the reactor of the simulation device, and the group of simulated natural gas was ventilated Into the gas circulation loop, the system pressure rises to a certain test pressure, and simulates the fluid state in the production system of the gas well. It is obtained that the mass ratio of the amide polymer mixture to water is at a concentration of 0% to 15%, and it lasts for more than 1000 minutes. The lowest temperature that inhibits hydrate formation. The polyvinyl caprolactam used in this embodiment has a molecular weight of 10,000.

Embodiment 2

[0026] Example 2: Group B formation water and a mixture of polyvinyl caprolactam and 2,6-dihydroxybenzamide with a mass ratio of 2.5:1 are added to the above-mentioned simulation device. The molecular weight of polyvinyl caprolactam is 9000, and other steps are the same as in Embodiment 1.

Embodiment 3

[0027] Example 3: Group C formation water and a mixture of polyvinyl caprolactam and α-hydroxycarboxylic acid amide with a mass ratio of 4:1 were added to the above-mentioned simulation device. The molecular weight of polyvinyl caprolactam was 8000, and other The steps are the same as in Embodiment 1.

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Abstract

The invention discloses a hydrate dynamic inhibitor, belonging to the technical field of oilfield chemistry. The hydrate dynamic inhibitor comprises amide-type polymers according to a certain proportion. The best effective concentration of the hydrate dynamic inhibitor is 3-5 % in formation water with the salinity of 30000-40000 mg / L. Under the highest pressure of 18 MPa, the generation temperature of the hydrate is reduced to -14 DEG C, and the induction time is longer than 1000 min. The inhibitor has the advantages of low price, no reaction with gas and liquid components, no increasement of toxicity of gas and combustion products, and no corrosion to the devices and pipelines, can be degraded and regenerated, and has the characteristics of low viscosity, low vapor pressure, and low freezing point.

Description

technical field [0001] The invention relates to a hydrate kinetic inhibitor, which belongs to the technical field of oil field chemistry, in particular to a hydrate kinetic inhibitor in the field of oil and gas field development. Background technique [0002] Natural gas hydrate, also known as clathrate, is an ice-like, non-chemical compound composed of water and natural gas under certain conditions (suitable temperature, pressure, gas saturation, water salinity, pH value, etc.). Metered, clathrate crystalline compound. The main gas forming gas hydrate is methane, and the gas hydrate with a molecular content of more than 99% of methane is usually called methane hydrate. Natural gas hydrates are mostly white or light gray crystals, similar to ice and snow in appearance, and can be ignited like alcohol blocks, so some people call it "combustible ice" and "air ice". [0003] Natural gas hydrate is an ice-snow complex formed by natural gas and liquid water at a certain tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524
Inventor 袁建民杨俊杨益荣戚杰刘伟
Owner CHINA PETROLEUM & CHEM CORP