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Composite hydrate inhibitor and application thereof

A hydrate inhibitor, a composite technology, applied in drilling compositions, piping systems, chemical instruments and methods, etc., to prevent hydrate nucleation, be widely used, and reduce the speed of growth and coalescence.

Active Publication Date: 2013-04-24
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the highest supercooling degree applicable to kinetic inhibitors is only 10-12°C. At higher supercooling degrees, it must be used in combination with thermodynamic inhibitors or antipolymerization agents to be economical and effective.

Method used

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  • Composite hydrate inhibitor and application thereof
  • Composite hydrate inhibitor and application thereof
  • Composite hydrate inhibitor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Based on the quality of the water, the preparation contains (C 4 h 9 ) 4 N + Br - (tetrabutylammonium bromide) mass concentration 0.5% and poly(NVP-2-vinylpyridine) (n=10-100) inhibitor 3.5wt% NaCl solution of mass concentration 1%, get 150mL and put into reaction kettle ( The mass ratio of liquid to gas is 1:1), the initial pressure is about 9.0MPa, and the temperature is maintained at about 1°C. The experimental gas is the mixed gas (CH 4 92.05%, C 2 h 6 5.05%, C 3 h 8 2.90%), the hydrate was completely formed after 850 min, and the viscosity of the hydrate slurry was 0.09 Pa·s.

Embodiment 2

[0050] Based on the quality of the water, the preparation (C 4 h 9 ) 4 N + Br - Mass concentration 1% and poly(NVP-2-vinylpyridine) (n=10-100) (n=10-100) inhibitor 3.5wt% NaCl solution of mass concentration 2%, get 150mL and put into reactor (the liquid-gas mass ratio is 1: 1 ), the initial pressure is about 9.0MPa, and the temperature is maintained at about 1°C. The experimental gas is the mixed gas (CH 4 92.05%, C 2 h 6 5.05%, C 3 h 8 2.90%), the hydrate was completely formed after 1120 min, and the viscosity of the hydrate slurry was 0.085 Pa·s.

Embodiment 3

[0052] Based on the quality of the water, the preparation (C 4 h 9 ) 4 N + Br - Mass concentration 1.5% and poly(NVP-2-vinylpyridine) (n=10-100) inhibitor 3.5wt% NaCl solution of mass concentration 2%, get 150mL and put into reactor (the liquid-gas mass ratio is 1: 1 ), the initial pressure is about 9.0MPa, and the temperature is maintained at about 1°C. The experimental gas is the mixed gas (CH 4 92.05%, C 2 h 6 5.05%, C 3 h 8 2.90%), the hydrate was completely formed after 1250 min, and the viscosity of the hydrate slurry was 0.083 Pa·s.

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Abstract

The invention discloses a composite hydrate inhibitor and application thereof. The provided composite hydrate inhibitor comprises a copolymer and an anti-aggregation agent; the copolymer is selected from at least one of the following substances: poly (N-vinyl pyrrolidone-2-vinyl pyridine) and poly (N-vinyl caprolactam-2-vinyl pyridine); and the anti-aggregation agent is a quaternary ammonium saltcompound. When the series of copolymer and the anti-aggregation agent are interacted, the composite hydrate inhibitor has good hydrate generation inhibiting performance. The hydrate inhibitor is in aliquid state, and can be used in the range that the water content is 10 to 80 weight percent, the pressure is 1.5 to 70MPa and the temperature is 20 DEG C below zero to 25 DEG C. The hydrate inhibitor cannot be limited by super-cooling degree, and is suitable for oil and water coexistence or oil-gas field and crude oil recovery; and particularly under the condition of high water content, the hydrate nucleation and aggregation inhibiting effects of the inhibitor can be fully exerted. The inhibitor has the advantages of high efficiency, economical efficiency, low dose and good biodegradability,and has good application prospect.

Description

technical field [0001] The invention relates to a compound hydrate inhibitor and its application. Background technique [0002] Natural gas hydrate is an ice-like compound formed by water molecules connected by hydrogen bonds to form a cage structure, and small gas molecules are enclosed in the cage structure by van der Waals force. During the extraction and transportation of oil and natural gas, various low-boiling hydrocarbons such as methane, ethane, propane, carbon dioxide, and hydrogen sulfide can easily form natural gas hydrates with water in petroleum fluids due to their special high-pressure and low-temperature environments. , it gathers together under certain conditions to form lumps, and in severe cases, it will block equipment such as pipelines, wellbores, valves and instruments, and bring great difficulties to the extraction, transportation and processing of oil and natural gas. Since Hammersdhmidt discovered that hydrates blocked natural gas pipelines in 1934, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/524F17D1/08F17D1/02C08F226/10C08F226/06
Inventor 樊栓狮李清平胡军王燕鸿郎雪梅李支文李斯佳姚海元程艳阚振江庞维新
Owner CHINA NAT OFFSHORE OIL CORP
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