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High-efficiency and environmentally-friendly hydrate inhibitor

A technology of hydrate inhibitors and kinetic inhibitors, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of limited use occasions, high cost of kinetic inhibitors, and great influence of subcooling. Achieve the effect of reducing corrosion damage, improving thermodynamic environment, and good effect

Inactive Publication Date: 2010-11-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the anti-aggregation agent disperses the hydrate particles into the oil phase, so the anti-aggregation agent can only work when there is an oil phase. Generally, the anti-aggregation agent is more expensive, has limited dispersion performance, and has a great relationship with the oil-gas system nature, so its use is limited
[0004] The "high-efficiency composite hydrate inhibitor" announced by Chinese patent CN101074361, the invention adds certain salts and alcohols to the existing kinetic inhibitors, and the induction time and completion time of hydrate formation are longer than those used alone, so that The effect of the kinetic inhibitor is better and the range of application is wider, but the cost of the kinetic inhibitor in this invention is high, and the added salts are highly corrosive
However, this invention is greatly affected by supercooling, high cost, complex synthesis process, and has certain pollution to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Experimental method and steps such as comparative example, add 150mL crude oil sample in reactor, wherein water 100g, in crude oil sample, add inhibitor of the present invention, the weight percent of inhibitor and water in crude oil sample is 11%, the PVP in inhibitor (polyvinylpyrrolidone) accounts for 4.5%, magnesium nitrate accounts for 95.5%, the reaction initial temperature is set as 3 ℃, feeds gas (CH 4 91.05%, C 2 h 6 6.05%, C 3 h 8 2.90%), make the pressure reach 6MPa, open the magnetic stirrer and start the reaction. At the end of the reaction, it was measured that the hydrate formation time was 146 minutes, and the hydrate formation time was 577 minutes. The pressure drop in the reaction was 0.4Mpa. The test results show that the combined use of 4.5% PVP (polyvinylpyrrolidone) and 95.5% magnesium nitrate significantly prolongs the hydrate formation time and complete formation time, and significantly reduces gas consumption. This system has obvious effec...

Embodiment 2

[0044] Add 150mL crude oil sample in reactor, wherein water 100g, in crude oil sample, add inhibitor of the present invention, the weight percent of inhibitor and water in crude oil sample is 8%, and PVP (polyvinylpyrrolidone) accounts for 5% in inhibitor. %, calcium nitrate accounts for 95%, the experimental procedure is as in Example 1, the hydrate formation time is 101min, the complete hydrate formation time is 427min, and the pressure drop in the reaction is 0.52Mpa. The results show that the inhibitors in this system have obvious inhibitory effect.

Embodiment 3

[0046] Add 150mL crude oil sample in reactor, wherein water 100g, in crude oil sample, add inhibitor of the present invention, the weight percent of inhibitor and water in crude oil sample is 7%, PVP (polyvinylpyrrolidone) accounts for 8.5% in inhibitor. %, magnesium acetate accounted for 91.5%, the experimental procedure was as in Example 1, the hydrate formation time was 179min, the complete hydrate formation time was 622min, and the pressure drop in the reaction was 0.33Mpa. The results show that the inhibitors in this system have obvious inhibitory effect.

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Abstract

The invention provides a high-efficiency and environmentally-friendly hydrate inhibitor, and relates to the technical field of oil-gas hydrates. The hydrate inhibitor is a mixture of a dynamic inhibitor, nitrate and acetate. The suitable pressure of the hydrate inhibitor is 1 to 25MPa and the suitable temperature is between -25 and 25 DEG C. The inhibitor can overcome the defects of the prior art; the inhibitor at low concentration is mixed and injected into petroleum and natural gas fluid for production and transportation, so that the speed of nucleation and growth of the hydrate is reduced, the inhibiting effect and the application range of the hydrate inhibitor are greatly increased, and the hydrate inhibitor has the characteristics of wide applicability, economy, high efficiency and environmental protection.

Description

technical field [0001] The invention relates to the technical field of oil and gas hydrates, in particular to an efficient and environment-friendly hydrate inhibitor. technical background [0002] Natural gas hydrate is a certain small molecular gas (N 2 , CO 2 、CH 4 、C 2 h 6 、C 3 h 8 etc.) and liquid water form ice-snow-like cage-shaped crystals. During the extraction and transportation of oil and natural gas, due to the low temperature and high pressure in the pipeline, it is easy to form natural gas hydrates. In severe cases, these hydrates can block wellbores, pipelines, Valves and equipment cause pipeline bursts and instrument damage, which affects the normal operation of natural gas mining, gathering, transportation and processing, causing huge economic losses. In addition, for offshore oil and gas field development and deep-sea pipeline transportation, the problem of hydrates is particularly prominent, because the water temperature and pressure conditions on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/528
Inventor 樊栓狮李波郎雪梅王燕鸿
Owner SOUTH CHINA UNIV OF TECH
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