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Hydrate inhibitor applicable to high moisture content system

A hydrate inhibitor, high water content technology, applied in the pipeline system, gas/liquid distribution and storage, mechanical equipment, etc., can solve the problems of hydrate difficult to coalesce, poor effect, loss of anti-polymerization effect, etc., to achieve Good anti-aggregation effect, good effect, and the effect of inhibiting the formation of hydrate

Active Publication Date: 2013-02-13
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, and its dosage is only a small part of the thermodynamic inhibitor , but the effect is not good when the water content of the system is higher than 50% (high water content system), and even loses the anti-polymerization effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The inhibitor of the present invention is prepared by mixing 0.35g Span20, 10.5g methanol and 3.5g NaCl.

[0037] In 100g of crude oil with a water content of 70wt%, add 14.35g of the inhibitor of the present invention, wherein Span20 accounts for 0.5% of the weight of water in the system, methanol accounts for 15% of the weight of water in the system, and NaCl accounts for the weight of water in the system of 5%, mix well.

[0038] Before the reaction begins, the reactor is cleaned with deionized water, and after vacuum drying, the crude oil sample added with the inhibitor of the present invention is added, and gas (CH 4 91.05%, C 2 h 6 6.05%, C 3 h 8 2.90%), the reaction kettle was immersed in a constant temperature tank, and after 1 hour of constant temperature at 35°C, after the pressure was constant to 6Mpa, the shaker was started, and the temperature of the constant temperature tank was set at 2 hours to cool down to 8°C. Keep the temperature at 8°C and conti...

Embodiment 2

[0040] Inhibitor of the present invention is made of 0.7g Span20, 7g ethanol, 7gMgCl 2 mixed.

[0041] In 100g of crude oil with a water content of 70wt%, add 14.7g of the inhibitor of the present invention, wherein Span20 accounts for 1% of the weight of water in the system, ethanol accounts for 10% of the weight of water in the system, MgCl 2 Accounting for 10% of the weight of water in the system, mix thoroughly.

[0042] Before the reaction begins, the reactor is cleaned with deionized water, and after vacuum drying, the crude oil sample added with the inhibitor of the present invention is added, and gas (CH 4 91.05%, C 2 h 6 6.05%, C 3 h 8 2.90%), the reaction kettle was immersed in a constant temperature tank, and after 1 hour of constant temperature at 35°C, after the pressure was constant to 6Mpa, the shaker was started, and the temperature of the constant temperature tank was set at 2 hours to cool down to 8°C. Keep the temperature at 8°C and continue to shake t...

Embodiment 3

[0044] Inhibitor of the present invention is made of 1.05g Span20, 14g ethylene glycol, 10.5gCaCl 2 mixed.

[0045] In 100g of crude oil with a water content of 70wt%, add 25.55g of the inhibitor of the present invention, wherein Span20 accounts for 1.5% of the weight of water in the system, ethylene glycol accounts for 20% of the weight of water in the system, CaCl 2 Accounting for 15% of the weight of water in the system, mix thoroughly.

[0046] Before the reaction begins, the reactor is cleaned with deionized water, and after vacuum drying, the crude oil sample added with the inhibitor of the present invention is added, and gas (CH 4 91.05%, C 2 h 6 6.05%, C 3 h 8 2.90%), the reaction kettle was immersed in a constant temperature tank, and after 1 hour of constant temperature at 35°C, after the pressure was constant to 6Mpa, the shaker was started, and the temperature of the constant temperature tank was set at 2 hours to cool down to 8°C. Keep the temperature at 8°C...

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PUM

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Abstract

The invention discloses hydrate inhibitor applicable to a high moisture content system, and relates to the technical field of oil gas hydrate. The hydrate inhibitor is a mixture of an anticaking agent, a soluble alcohol and salt. The hydrate formed inhibitor has a using pressure of between 1.5 and 30MPa, and a temperature of between -25 and 35 DEG C. The inhibitor can overcome the defects in the prior art, can reduce the speed of nucleation, growth and coalescence of the hydrate by being injected into produced or conveyed petroleum fluid after being mixed at low concentration, has wide applicability, is particularly applicable to the high moisture content system, and has low cost.

Description

technical field [0001] The invention relates to the technical field of oil and gas hydrates, in particular to a hydrate inhibitor suitable for high water content systems. 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 water temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D1/08
Inventor 樊栓狮杜娟王燕鸿郎雪梅毕丹丹
Owner SOUTH CHINA UNIV OF TECH
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