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Low temperature demulsifier and preparation method thereof

A demulsifier and low-temperature technology, which is used in chemical dehydration/demulsification, treatment of hydrocarbon oil, petroleum industry, etc. Problems such as high system operating load

Inactive Publication Date: 2015-01-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the continuous increase of the scale of production and construction, the pressure of crude oil dehydration treatment continues to increase. Due to the high temperature requirements of the crude oil demulsifier currently in use, the heating system of some sites has a large operating load, which cannot meet the dehydration temperature requirements of the demulsifier, resulting in the effect of crude oil demulsification and dehydration. Poor, high concentration of demulsifier dosing, so it is urgent to develop a low-temperature and high-efficiency demulsifier, which can realize demulsification and dehydration of crude oil at a lower temperature, and improve the demulsification efficiency without increasing the concentration of demulsifier

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of double block polyether with phenolic resin as ether head

[0021] Add 477Kg of nonylphenol into the reaction kettle, stir and heat up to 40°C, add 7.16Kg of 50% sodium hydroxide solution, continue stirring and add 142.7Kg of formaldehyde to the reaction kettle dropwise when the temperature rises to 50°C For the solution, the dropping time is 30-40min, the dropping temperature is controlled at 50-70°C, and the reaction is kept at 60-80°C for 30min after adding formaldehyde. Then raise the temperature and react at 100-120°C for 1 hour, stop heating the reactor, start vacuum dehydration, and gradually increase the vacuum degree, dehydrate at 150°C-155°C for 1.5 hours, pressure 0.08mPa, pass nitrogen to obtain phenolic resin ether head.

[0022] Pump 6.8Kg of 50% potassium hydroxide solution between 150°C and 155°C, continue dehydration for 0.5h, add 596.4Kg of propylene oxide, control the temperature at 120-135°C, and the pressure is less than or equal t...

Embodiment 2

[0030] (1) Preparation of multi-block polyether with phenolic resin as ether head

[0031] The phenolic resin ether head was prepared according to the method of (1) in Example 1.

[0032] Pump 4.8Kg of 50% potassium hydroxide solution between 150°C and 155°C, continue dehydration for 0.5h, add 215Kg of propylene oxide, control the temperature at 120-135°C, and the pressure is less than or equal to 0.3mpa, and finish adding propylene oxide Finally, pump to negative pressure, and then vacuum for 5 minutes, then inject 77.5Kg of ethylene oxide, control the temperature at 120-135°C, and the pressure is not greater than 0.3mpa. Vacuumize for 5 minutes, then inject 215Kg of propylene oxide, control the temperature at 120-135°C, and the pressure is not greater than 0.3mpa. After the addition of ethylene oxide, it must be pumped to negative pressure, then vacuum for 5 minutes, and then inject ethylene oxide 65Kg, the temperature is controlled at 120-135°C, the pressure is not greater...

Embodiment 3

[0039] (1) Preparation of multiple block polyethers under different initiators

[0040] Use propylene glycol, diethylenetriamine, and bisphenol A as ether heads respectively, pump 7.0Kg of 50% potassium hydroxide solution between 130°C and 135°C, dehydrate for 0.5h, and add 450Kg of propylene oxide after nitrogen replacement. Control at 120-135°C, the pressure is not greater than 0.3mpa, pump to negative pressure after adding propylene oxide, and then vacuum for 5min, then inject 215Kg of ethylene oxide, control the temperature at 120-135°C, and the pressure is not greater than 0.3 mpa, after feeding ethylene oxide, it needs to be pumped to a negative pressure, and then vacuumed for 5 minutes, and the temperature can be lowered to obtain different ether head-PO-EO double block polyethers.

[0041] Use propylene glycol, diethylenetriamine and bisphenol A as starters respectively, pump 6.0Kg of 50% potassium hydroxide solution between 130°C and 135°C, dehydrate for 0.5h, add 350...

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Abstract

The invention relates to a low temperature (30 DEG C) demulsifier and a preparation method thereof. The demulsifier comprises by 40-45% of multiple block polyether, 1.5-2% of triethanolamine, 2-2.5% of oleic acid and 20-50% of methanol and the balance of water, calculated by the weight of the demulsifier being 100%. The low temperature demulsifier of the invention has dehydration rate of 91.6% to crude oil of Changqing ultralow permeability reservoir under the conditions of 50 ppm and temperature of 30 DEG C.

Description

technical field [0001] The invention relates to a low-temperature (30°C temperature) demulsifier and a preparation method thereof, in particular to a demulsifier with multi-block polyether as the main raw material and a preparation method thereof, which is mainly used for demulsification and dehydration of oilfield emulsions. Background technique [0002] With the rapid development of Changqing Oilfield, the liquid production volume of the oilfield has increased. Due to the continuous increase of the scale of production and construction, the pressure of crude oil dehydration treatment continues to increase. Due to the high temperature requirements of the crude oil demulsifier currently in use, the heating system of some sites has a large operating load, which cannot meet the dehydration temperature requirements of the demulsifier, resulting in the effect of crude oil demulsification and dehydration. Poor and high concentration of demulsifier, it is urgent to develop a low-te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04C08G65/32C08G65/26C08G65/28
CPCC10G33/04C08G65/2609C08G65/2612C08G65/2624C08G2650/58C10G2300/201
Inventor 陆梅罗聪英王尚卫唐凡苑慧莹周杨帆姚洋任鹏刘涛姬振宁
Owner PETROCHINA CO LTD
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