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Application of a rhamnolipid-containing composite hydrate antipolymerization agent

A rhamnolipid, hydrate technology, applied in gas/liquid distribution and storage, pipeline systems, mechanical equipment, etc., can solve the problems of limited application, viscous hydrate slurry, poor biodegradability, etc. Good degradability, stable anti-aggregation performance and wide application range

Active Publication Date: 2017-11-21
CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In terms of the development of gas hydrate antipolymerization agents, there is a hydrate antipolymerization agent in the prior art, which is composed of polyoxyethylene dicarboxylic acid ester gemini nonionic surfactant and polyol type nonionic surfactant. The disadvantages are that this type of antipolymerization agent is added in a large amount, the biodegradability is poor, and the hydrate slurry formed under the condition of high water content is relatively viscous, and the pipeline pressure resistance is large.
[0005] There is another way: a hydrate inhibitor can be obtained by mixing polyvinylimidazole with electrolytes or soluble alcohols, which can inhibit hydrate blockage, but this type of inhibitor can only have a kinetic inhibition effect, and the tolerable The degree of supercooling is small, when hydrates are formed in the system, the anti-polymerization effect will be lost
In addition, such inhibitors are mainly used in pure water systems, and are limited in the application of oil-gas-water multiphase mixed transportation systems.
There is also the synthesis of a class of gemini quaternary ammonium salts with hydrate anti-polymerization properties, but the disadvantage is that this type of anti-polymerization agent is an organic synthesis product, the economic and environmental protection is not high, the biodegradability is poor, and the addition amount is relatively large, and it can be used at high Limited application in moisture content systems

Method used

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  • Application of a rhamnolipid-containing composite hydrate antipolymerization agent

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment adopts rhamnolipid-containing composite hydrate antipolymerization agent, and applies it to an oil-water system with a water content of 10% (calculated based on the sum of the volumes of water and oil), and the present embodiment The anti-aggregation effect of hydrate anti-aggregation agent was evaluated.

[0032] The present embodiment adopts high-pressure sapphire reactor to carry out system evaluation, such as figure 1 As shown, it mainly includes a high-pressure sapphire reactor body 1, a constant temperature air bath 2, a temperature sensor 3 and a pressure sensor 4, a hand pump 5, a stirring system and an automatic data acquisition system 6. The maximum working volume of high pressure sapphire reactor 1 is 49cm 3 , the maximum working pressure is 50MPa, and the working temperature range is 183K-423K. There is a closed piston 7 in the reaction kettle, which can separate the pressurized fluid (petroleum ether) from the experimental system, and the ...

Embodiment 2

[0045] In this example, rhamnolipid-containing composite hydrate antipolymerization agent is used, which is obtained by mixing rhamnolipid biosurfactant and sodium chloride electrolyte at a mass ratio of 0.5:1.

[0046] In this embodiment, the high-pressure sapphire reactor described in Example 1 is used for evaluation, and the specific experimental process is as described in Example 1.

[0047] In this embodiment, 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 10% (based on the sum of the volumes of water and oil), In this embodiment, the added amount of rhamnolipid is 2% of the water amount, the added amount of NaCl is 5% of the water amount, and the experimental gas composition introduced is shown in Table 1.

[0048] During the whole experiment process of this example, the hydrate particles were evenly dispersed in the oil phase, and there was no phenomenon of hyd...

Embodiment 3

[0050] In this example, rhamnolipid-containing composite hydrate antipolymerization agent is used, which is obtained by mixing rhamnolipid biosurfactant and potassium nitrate electrolyte at a mass ratio of 2:1.

[0051] In this embodiment, the high-pressure sapphire reactor described in Example 1 is used for evaluation, and the specific experimental process is as described in Example 1.

[0052] In this embodiment, 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 10% (based on the sum of the volumes of water and oil), In the present embodiment, the added amount of rhamnolipid is 2% of the water amount, KNO 3 The added amount is 5% of the water amount, and the experimental gas composition introduced is shown in Table 1.

[0053] During the whole experiment process of this example, the hydrate particles were evenly dispersed in the oil phase, and there was no phenomenon ...

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Abstract

The invention discloses the application of a rhamnolipid-containing composite hydrate antipolymerization agent, wherein the volume of water in an oil-water mixed transportation system when the rhamnolipid-containing composite hydrate antipolymerization agent is used does not exceed 60% of the total volume of oil and water. It overcomes the disadvantages of traditional thermodynamic inhibitors such as large amount of use, serious environmental pollution, high requirements on pipe materials, and low undercooling degree of kinetic inhibitors. It has good biodegradability, economical and environmental protection, low dosage, wide application range, anti-polymerization Stable performance and other characteristics.

Description

technical field [0001] The invention relates to the technical field of oil and gas transportation, in particular to the application of a rhamnolipid-containing compound hydrate antipolymerization agent. Background technique [0002] During oil-gas-water multiphase mixed transportation, under low temperature and high pressure conditions, certain low boiling point gas molecules (CH 4 、C 2 h 6 , CO 2 and H 2 S, etc.) can easily form a non-stoichiometric crystalline cage-like substance with water molecules, commonly known as combustible ice. During the flow process, these solid crystalline substances are easy to deposit on valves, elbows, connectors and other parts, and the flow area of ​​natural gas is reduced, thereby forming a local blockage. The upstream pressure increases, the flow rate decreases, and the downstream pressure decreases. Affect the normal operation of pipeline gas transmission and distribution. At the same time, if the hydrate is formed at the throttle ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D1/02
Inventor 闫柯乐邹兵姜素霞张红星谈龙妹薛松
Owner CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG
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