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A kind of composite gas hydrate polymerization inhibitor and its application

A technology of gas hydrate and polymerization inhibitor, which is applied in the direction of gas/liquid distribution and storage, pipeline system, mechanical equipment, etc. It can solve the problems of unsatisfactory anti-polymerization effect, poor biodegradability, high price, etc., and achieves good application prospects , low addition amount, good anti-polymerization performance

Active Publication Date: 2017-07-14
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these polymerization inhibitors have the disadvantages of toxicity, poor biodegradability, high price, and unsatisfactory anti-polymerization effect.

Method used

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  • A kind of composite gas hydrate polymerization inhibitor and its application
  • A kind of composite gas hydrate polymerization inhibitor and its application
  • A kind of composite gas hydrate polymerization inhibitor and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1. Composite gas hydrate inhibitor and its application performance evaluation

[0037] The composite gas hydrate polymerization inhibitor of this example is prepared by mixing dodecyl betaine and polyol type nonionic surfactant Span 20 (HLB value 8.6) at a mass ratio of 1:1.

[0038] In this embodiment, a fully transparent sapphire autoclave is used for the application evaluation test. The structure of the fully transparent sapphire autoclave is as follows: figure 1 shown. The reaction kettle is a common equipment for evaluating the inhibitory effect of gas hydrate polymerization inhibitors on gas hydrate aggregation. It mainly includes high-pressure sapphire reaction kettle body 1, constant temperature air bath 2, temperature sensor 3 and pressure sensor 4, hand pump 5, Stirring system and computer data automatic acquisition system6. The maximum working volume of the high pressure sapphire reactor is 49cm 3 (including piston 7 and stirring bar 8), the maximu...

Embodiment 2

[0050] Example 2. Composite gas hydrate inhibitor and its application performance evaluation

[0051] The composite gas hydrate polymerization inhibitor of this example is prepared by mixing lauryl betaine and polyol type nonionic surfactant Span 20 (HLB value 8.6) at a mass ratio of 0.5:1.

[0052] Adopt the application evaluation test of polymerization inhibitor as in embodiment 1, concrete test process is as described in embodiment 1.

[0053] In this example, an oil-water system consisting of 1.5ml of deionized water and 13.5ml of -20# diesel oil was added to the reactor, that is, a mixture with a water content of 10% (based on the sum of the volumes of water and oil) Infusion system; the addition amount of the composite gas hydrate polymerization inhibitor in this embodiment is 3.0% of the water quality in the system, and its use effect is evaluated.

[0054] During the whole experiment process of this example, the gas hydrate particles were uniformly dispersed in the oi...

Embodiment 3

[0055] Example 3. Composite gas hydrate inhibitor and its application performance evaluation

[0056] The composite gas hydrate polymerization inhibitor of the present embodiment is composed of lauryl betaine and polyol type nonionic surfactant Span 20 (HLB value is 8.6) with a mass ratio of 2:1 Mixed to get.

[0057] Adopt the application evaluation test of polymerization inhibitor as in embodiment 1, concrete test process is as described in embodiment 1.

[0058] In this example, an oil-water system consisting of 1.5ml of deionized water and 13.5ml of -20# diesel oil was added to the reactor, that is, a mixture with a water content of 10% (based on the sum of the volumes of water and oil) Infusion system; the addition amount of the composite gas hydrate polymerization inhibitor in this embodiment is 3.0% of the water quality in the system, and its use effect is evaluated.

[0059] During the whole experiment process of this example, the gas hydrate particles were uniformly...

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Abstract

The invention discloses a compound gas hydrate polymerization inhibitor and application thereof. The compound gas hydrate polymerization inhibitor consists of a betaine zwitterionic surfactant and a polyalcohol nonionic surfactant in the mass ratio of (0.01-100):1. The compound gas hydrate polymerization inhibitor is applied to prevention of gas hydrate polymerization in an oil-gas-water three-phase mixed conveying system. The compound gas hydrate polymerization inhibitor has the advantages that (1) used raw materials are low in toxicity, and have high biodegradability in nature, so that severe environmental pollution is avoided; (2) the defects of the conventional gas hydrate inhibitors such as large using amount, high cost and high pipeline quality requirement in a thermodynamic inhibitor, low super-cooling degree bearing capacity of a kinetic inhibitor, and the like are overcome; the particle size of the gas hydrate can be effectively controlled, and gas hydrate particles are uniformly distributed into an oil phase, so that the problem concerned with safe flow of oil-gas-water phases is solved effectively; (4) the adding amount is small, the polymerization resistance is high, and the application prospect is good.

Description

technical field [0001] The invention relates to a composite gas hydrate polymerization inhibitor and application thereof, belonging to the technical field of oil and gas production. Background technique [0002] Gas hydrate is a special cage compound, which is a non-chemical compound formed by water (host molecule) and small molecules (guest molecules) such as methane, ethane, propane, propylene, nitrogen, and carbon dioxide at a certain temperature and pressure. Quantitative cage-type solid crystalline substances, also known as cage-type hydrates. The gas hydrates that have been discovered and studied now mainly have three crystal structures, namely type I, type II and type H. In the following decades, many scholars have conducted research on natural gas hydrate, and the developed gas hydrate application technology also involves many fields such as water resources, environmental protection, climate, oil and gas storage and transportation, petrochemical industry, and bioche...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D1/16F17D1/02
Inventor 李清平陈光进庞维新孙长宇闫柯乐姚海元朱海山程兵陈绍凯
Owner CHINA NAT OFFSHORE OIL CORP
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