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Demulsifying dehydration method of oil-water emulsion

A technology for oil-water emulsion and demulsification, which is applied in the field of demulsification and dehydration of oil-water emulsion, and can solve the problems of unsatisfactory effect, increased processing load of sedimentation tank and chemical cost, etc.

Active Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the method of increasing demulsification and water separation time and / or increasing the amount of demulsifier is usually used to deal with this problem, but the effect is not ideal, and increasing the demulsification and water separation time and the amount of demulsifier will also increase the concentration of the settling tank. processing load and agent cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 100 g of Xinjiang Tahe ultra-thick crude oil with a viscosity of 560,000 mPa·s at 50°C, mix 0.9 g of nonylphenol block polyether carboxylate (number-average molecular weight 1500) with 40 g of water, and add it to the above-mentioned heavy oil, A water-in-oil emulsion was formed after stirring at 50°C for 5 minutes. Add 100ppm of demulsifier (model: BS-019, source: Shandong Binhua Group Co., Ltd.) and 20mL of mixed brine with a total ion concentration of 30,000mg / L to the above-mentioned oil-water emulsion, mix well, and settling and dehydration at 95°C , oil-water separation within 30min, the oil-water interface is clear, and the water content of the oil phase is measured by the method of GB / T 8929-2006 to 0.3%.

Embodiment 2

[0033] Weigh 100g of Xinjiang Tahe mixed heavy oil with a viscosity of 53000mPa·s at 50°C, mix 1.2g of dodecanol polyoxyethylene ether sulfate sodium salt (number average molecular weight 400) with 10g of water, and add it to the above-mentioned heavy oil. , a water-in-oil emulsion was formed after stirring at 50°C for 5 minutes. Add 200ppm of demulsifier (model: BC-019, source: Shandong Binhua Group Co., Ltd.) and 44mL of mixed brine with a total ion concentration of 200,000mg / L to the above-mentioned oil-water emulsion, mix well, and settling and dehydration at 80°C , Oil and water are separated within 30min, the oil-water interface is clear, and the water content of the oil phase is measured by the method of GB / T 8929-2006 ≤ 0.5%.

Embodiment 3

[0039]Weigh 100g of Xinjiang Tahe mixed heavy oil with a viscosity of 16280mPa·s at 50°C, add 0.01g isooctylphenol block polyether phosphate sodium salt (number average molecular weight 2000), dilute with 20g of water and add it to the above-mentioned heavy oil. , a water-in-oil emulsion was formed after stirring at 50°C for 5 minutes. Add 50ppm of demulsifier (model: BS-107, source: Shandong Binhua Group Co., Ltd.) and 24mL of formation water with a total ion concentration of 250,000mg / L to the above-mentioned oil-water emulsion, mix them evenly, settling and dehydration at 50°C, The oil and water are separated within 40 minutes, and the oil-water interface is clear. The water content of the oil phase is ≤0.5% measured by the method of GB / T 8929-2006.

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Abstract

The invention relates to a demulsifying dehydration method of an oil-water emulsion. The method comprises a step that demulsifying dehydration is carried out through mixing the oil-water emulsion with salt-containing water and a demulsifying agent, wherein the total ion concentration of the salt-containing water is 10000-300000mg / L, and the application amount of the salt-containing water is 10-50% of the volume of the oil-water emulsion; and the oil-water emulsion is a water-in-oil emulsion formed by viscous oil and water, and contains an emulsified viscosity reducer. The method is suitable for the demulsifying dehydration of oilfield produced fluids containing the viscous oil and the emulsified viscosity reducer.

Description

technical field [0001] The invention relates to a method for demulsification and dehydration of oil-water emulsion. Background technique [0002] With the continuous increase of oil demand and the continuous consumption of ordinary crude oil, people pay more and more attention to heavy oil resources. The reserves of heavy oil in the world are quite abundant, and the huge amount of resources makes heavy oil expected to become the main energy source in the 21st century. However, the development and utilization of heavy oil resources still faces many difficulties, one of which is the high viscosity and poor fluidity of heavy oil. , mining and transportation are more difficult. [0003] Heavy oil refers to crude oil with a viscosity greater than 50mPa.s at 50°C. According to the viscosity at 50°C, heavy oil can be further divided into ordinary heavy oil (50-10000mPa.s), extra-heavy oil (10000-50000mPa.s) and ultra-heavy oil. Oil (above 50000mPa.s). [0004] The emulsification...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04
Inventor 罗咏涛秦冰李本高
Owner CHINA PETROLEUM & CHEM CORP
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