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High-efficiency hydrate inhibitor containing corrosion inhibitor

A hydrate inhibitor and corrosion inhibitor technology, used in pipeline systems, mechanical equipment, gas/liquid distribution and storage, etc. Coalescence and other problems, to achieve the effect of overcoming corrosion, protecting pipelines, and simple processing technology

Active Publication Date: 2010-03-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The antipolymerization agent cannot prevent the formation of gas hydrate in the pipeline, but it can make it difficult for the hydrate to coalesce, and it can be used at a higher subcooling degree than the kinetic inhibitor, but usually requires a water content of less than 50%. Applications at high moisture content are limited
At present, a variety of anti-polymerization agents have been developed, but the actual effect is not ideal, and the subcooling degree that can be tolerated cannot meet the requirements of environmental changes.

Method used

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  • High-efficiency hydrate inhibitor containing corrosion inhibitor

Examples

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Effect test

Embodiment 1

[0052] Experimental steps and conditions such as comparative example, add 150mL crude oil sample in reactor, in crude oil sample, add inhibitor of the present invention, wherein the weight ratio of span20 and water in crude oil sample is 0.5%, the weight ratio of sodium chloride and water It is 12%, and the weight ratio of cinnamaldehyde and water is 20ppm. The initial temperature of the reaction was set at 3°C, and 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. By magnetic stirring, it was found that hydrates were formed, and the pressure reached 4.7 MPa. After the reaction, it was measured that the hydrates started to form in 170 minutes, and the hydrates were completely formed in 400 minutes. Comparing the test results with Comparative Examples 2 and 4, the results show that the combined use of 0.5% Span20 (sorbitan monolaurate) and 12% sodium chloride significantly prolongs the formation...

Embodiment 2

[0054] In reactor, add 150mL crude oil sample, in crude oil sample, add inhibitor of the present invention, wherein the weight ratio of water in Span20 (sorbitan monolaurate) and crude oil sample is 1%, the weight ratio of magnesium chloride and water is 8%, the weight ratio of cinnamaldehyde to water is 15ppm; the experimental steps and conditions are as in Example 1, it can be found that hydrate is formed by magnetic stirring, the pressure reaches 4.6MPa, the hydrate formation time is 160min, and the hydrate complete formation time is 410min. The results show that the inhibitor of the present invention has obvious inhibitory and anti-polymerization effects.

Embodiment 3

[0056] Add 150mL crude oil sample in reactor, in crude oil sample, add inhibitor of the present invention, wherein the weight ratio of span20 (sorbitan monolaurate) and water in crude oil sample is 0.05%, calcium chloride and crude oil sample The weight ratio of water is 25%, and the weight ratio of cinnamaldehyde and water in the crude oil sample is 15ppm; Experimental procedure and condition are as embodiment 1, and 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. It can be found that hydrate is formed by magnetic stirring, the pressure reaches 4.8MPa, the hydrate formation time is 190min, and the hydrate complete formation time is 350min. The results show that the inhibitor of the present invention has obvious inhibitory and anti-polymerization effects.

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Abstract

The invention discloses a high-efficiency hydrate inhibitor containing corrosion inhibitor, which relates to the technical field of oil-gas hydrate. The hydrate inhibitor is a mixture of anti-agglomerant, inorganic salt and corrosion inhibitor. The use condition of the hydrate inhibitor is as follows: the pressure is 1.5 to 25 MPa, the temperature is minus 20 DEG C to 25 DEG C, and the volume percentage of systematic water is lower than 50 percent. The hydrate inhibitor can overcome the deficiency of the prior art, can be mixed at low concentrate and injected into oil flow in production or delivery, reduce the speed of nucleation, growth and agglomeration of the hydrate, and simultaneously reduce the corrosion rate of pipelines, slow down the corrosion and damage of salt to the pipelines,and is characterized by wide applicability, low cost and no corrosion to the pipelines.

Description

technical field [0001] The invention relates to the technical field of oil and gas hydrates, in particular to a high-efficiency hydrate inhibitor containing a corrosion inhibitor. technical background [0002] In the pipelines of natural gas and petroleum fluids, various low-boiling hydrocarbons such as methane, ethane, propane, carbon dioxide, hydrogen sulfide, etc., react with water under certain temperature and pressure conditions to form a kind of ice-like crystal with a cage structure. It is a non-stoichiometric solid compound. In the oil and gas industry, the formation of gas hydrates will lead to the blockage of oil and gas transportation pipelines, and even the bursting of pipelines, which will bring many technical obstacles and huge economic losses to the exploitation and transportation of oil and natural gas. In addition, for offshore oil and gas field development and deep-sea pipeline transportation, the problem of hydrate is particularly prominent, because the w...

Claims

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Application Information

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IPC IPC(8): F17D3/16
Inventor 樊栓狮龙飞杜娟王燕鸿郎雪梅毕丹丹
Owner SOUTH CHINA UNIV OF TECH
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