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A block polyether demulsifier using polyethyleneimine as an initiator and its preparation method

A technology of polyethyleneimine and block polyether, which is applied in the direction of dehydration/demulsification by chemical methods, and can solve the problems of deteriorating water quality and dehydration rate.

Active Publication Date: 2016-05-18
河北盛田化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For polymer flooding produced fluids, the distribution of polymers in the water phase and the oil-water interface leads to a stronger oil-water emulsion stability, resulting in a decrease in dehydration rate and poor quality of produced water during demulsification
So far, the demulsifiers used in various oilfields are mainly proposed for W / O crude oil emulsions after water flooding, and there is little work on demulsifiers for W / O crude oil emulsions produced after polymer flooding.

Method used

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  • A block polyether demulsifier using polyethyleneimine as an initiator and its preparation method
  • A block polyether demulsifier using polyethyleneimine as an initiator and its preparation method
  • A block polyether demulsifier using polyethyleneimine as an initiator and its preparation method

Examples

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Effect test

Embodiment 1

[0022] Example 1 Preparation of Ethylene Oxide and Propylene Oxide Block Polyether Demulsifier Using Polyethyleneimine (Mw=600) as Initiator

[0023] Add 10g of polyethyleneimine and 24g of potassium hydroxide into the high-temperature and high-pressure reactor, and seal the reactor well. Before heating up, use nitrogen to blow and replace, then use a vacuum pump to evacuate, repeat twice, then start stirring and raise the temperature, stop heating when the temperature rises to 120°C, open the feed valve, add 800g of propylene oxide dropwise, and control the reaction The temperature does not exceed 140°C and the pressure is controlled below 0.4MPa. After the reaction of the material is completed, the pressure drops and then reacts for 30 minutes to reduce the pressure to 0MPa; then, heat to 120°C and then add 800g of ethylene oxide, and control the reaction temperature not to exceed 150°C and the pressure is controlled below 0.4MPa. After the reaction of the material is comple...

Embodiment 2

[0025] Adopt the method with embodiment 1, but change the quality of the propylene oxide that adds for the first time, ethylene oxide and the propylene oxide that add for the second time are respectively 800g, 400g and 2800g, obtain the polyethyleneimine (Mw =600) as the initiator of ethylene oxide and propylene oxide block polyether demulsifier, marked as PEI600-217.

Embodiment 3

[0027] Adopt the method with embodiment 1, but change the quality of the propylene oxide that adds for the first time, ethylene oxide and the propylene oxide that adds for the second time to be 800g, 4800g and 7200g respectively, obtain polyethyleneimine (Mw =600) as the initiator of ethylene oxide and propylene oxide block polyether demulsifier, marked as PEI600-169.

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Abstract

The invention discloses a block polyether demulsifier using polymine as an initiator and a preparation method thereof, and belongs to the technical field of preparation of block polyether demulsifiers. The preparation method comprises the following steps: by using polymine as the initiator, carrying out ring opening polymerization on epoxy propane and ethylene oxide at a temperature smaller than 150 DEG C and a pressure smaller than 0.4 MPa to obtain an epoxy propane and ethylene oxide block polyether demulsifier using polymine as the initiator. The demulsifier disclosed by the invention has a good demulsification effect on W / O (water in oil) type emulsion generated after oilfield polymer flooding.

Description

technical field [0001] The invention relates to the technical field of preparation of block polyether demulsifiers, in particular to a block polyether demulsifier using polyethyleneimine as a starting agent and a preparation method thereof. Background technique [0002] At present, many domestic oilfields have entered the stage of full-scale polymer injection, and the properties of polymer flooding fluids are quite different from those of water flooding fluids. For the produced fluid of polymer flooding, the distribution of the polymer in the water phase and the oil-water interface leads to stronger stability of the oil-water emulsion, resulting in a decrease in the dehydration rate and a deterioration of the produced water quality during demulsification. So far, the demulsifiers used in various oilfields are mainly proposed for W / O crude oil emulsions after water flooding, and there is little work on demulsifiers for W / O crude oil emulsions produced after polymer flooding. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/26C10G33/04
Inventor 段明方申文王虎刘春潮
Owner 河北盛田化工股份有限公司
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