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Hydrate formation inhibitor

A hydrate inhibitor and inhibitor technology, applied in the chemical field, can solve the problems of high cost, high concentration, and large consumption, and achieve the effect of reducing nucleation

Active Publication Date: 2009-01-21
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such inhibitors have the disadvantages of high concentration (10-60wt%), large consumption, high cost, and strong environmental pollution, which can no longer meet the requirements of offshore oil and gas exploration operations.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The polyvinylpyrrolidone and diethylene glycol butyl ether were respectively prepared into 200g aqueous solution according to the mass concentration of 0.5%, and put into the reactor with stirring. The initial pressure of the experiment was 8.5MPa, and the experimental gas was the mixed gas (91.86% of methane, 5.04% of ethane and 3.1% of propane), the reaction temperature was maintained at 4.0°C, and no hydrate was formed within 72 hours.

Embodiment 2

[0019] 3% of polyvinylpyrrolidone and 2% of diethylene glycol butyl ether concentration were respectively configured into 200g aqueous solution according to the mass, and put into a stirred reactor. The experimental pressure was 8.5MPa. Gas (91.90% of methane, 5.05% of ethane and 3.05% of propane), the reaction temperature was maintained at 4.0°C, and no hydrate was formed within 56 hours.

Embodiment 3

[0021] 1% of polyvinylpyrrolidone and 1.24% of diethylene glycol butyl ether concentration were formulated into 200g of reaction solution according to the mass of electrolyte-containing brine with the following components. The brine components were sodium bicarbonate 0.92g / l and calcium chloride 9.16g / l, magnesium chloride 1.25g / l, barium chloride 0.69g / l, sodium chloride 24.28g / l. The prepared reaction solution is packed into a stirred reactor, the test pressure is 9.0MPa, the test gas is the mixed gas (methane 91.90%, ethane 5.05% and propane 3.05%) provided by Foshan Gas Factory, and the reaction temperature is maintained at 4-6.0°C, no hydrate is formed within 20 hours.

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Abstract

An efficient low-concentration hydrate inhibitor is mixture of polyvinyl pyrrolidone and ethyl glycol butyl ether, the concentration is 0.01-6 wt%. Electrolyte and soluble alcohol etc. chemical preparations are added to change reactant thermo-dynamic condition; the usage pressure is controlled between 1MPa to 30MPa. It's convenient, has less hydrate crystal nucleation, growth or agglomerate speed.

Description

technical field [0001] The invention relates to the technical field of chemistry, in particular to a novel hydrate inhibitor. technical background [0002] Various low-boiling hydrocarbons such as methane, ethane, propane and carbon dioxide, hydrogen sulfide, etc. are present in natural gas and other petroleum fluids, and water is also mixed with these petroleum fluid components in varying amounts. At low temperature and high pressure, when such petroleum fluid components or other hydrate formers are mixed with water, gas hydrates can be formed, which are clathrate crystals formed by water and small molecular gases such as light hydrocarbons. During the exploitation and transportation of natural gas and other petroleum fluids, these clathrate hydrates may block pipelines and bring difficulties to the exploitation or transportation of oil and natural gas. For example, under a pressure of about 1 MPa, ethane can form hydrates at a temperature lower than 4°C, and at a pressure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L39/06C08K5/06F17D1/16F17D1/02
Inventor 唐翠萍梁德青樊栓狮杜建伟
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI