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Demulsification water purifying agent for composite flooding production fluid and preparation method thereof

A technology of emulsion water purifier and surfactant, which is applied in chemical dehydration/demulsification, separation methods, mining wastewater treatment, etc., can solve the problem of large amount of scum in the sewage system, and achieve surface performance and permeability Excellent, less scum generation, strong flocculation and cohesion ability

Active Publication Date: 2019-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the demulsification water purification treatment agent produces a large amount of scum in the sewage system after use, and is only suitable for sewage systems equipped with air flotation devices at the rear end

Method used

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  • Demulsification water purifying agent for composite flooding production fluid and preparation method thereof
  • Demulsification water purifying agent for composite flooding production fluid and preparation method thereof
  • Demulsification water purifying agent for composite flooding production fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The demulsification water purifying agent used for composite flooding production fluid is composed of the following components in mass percentage: polyether block copolymer 45%, polyether polyol 40%, esterified end-capped polyether surfactant 15% %.

[0032] The polyether block copolymer is prepared by reacting the following raw materials in mass percentage: 2% of propylene glycol, 39.7% of propylene oxide, 58% of ethylene oxide, and 0.3% of potassium hydroxide. The preparation steps are: put the initiator propylene glycol in a pear-shaped flask, vacuum dehydrate at 95°C for 1 hour; add the catalyst KOH under nitrogen flow, heat at 120°C until the KOH is completely melted, vacuum dehydrate at 80°C for 1 hour, and introduce the dried high pressure while it is hot In the reaction kettle, cover it; replace and remove the air in the reaction kettle with nitrogen for 3 times, set the speed at 210 rpm, add the required EO monomer at 100°C, and carry out the polymerization rea...

Embodiment 2

[0037] The demulsification water purifying agent used for composite flooding production fluid is composed of the following components in mass percentage: polyether block copolymer 50%, polyether polyol 30%, esterified end-capped polyether surfactant 20% %.

[0038] The polyether block copolymer is prepared by reacting the following raw materials in mass percentage: 1% of propylene glycol, 66.9% of propylene oxide, 31.6% of ethylene oxide, and 0.5% of potassium hydroxide. The preparation steps are: put the initiator propylene glycol in a pear-shaped flask, vacuum dehydrate at 95°C for 1 hour; add the catalyst KOH under nitrogen flow, heat at 120°C until the KOH is completely melted, vacuum dehydrate at 80°C for 1 hour, and introduce the dried high pressure while it is hot In the reaction kettle, cover; fill nitrogen to replace and remove the air in the reaction kettle twice, set the speed at 180 rpm, add the required EO monomer at 100°C, and carry out the polymerization reactio...

Embodiment 3

[0043] The demulsification water purifying agent used for composite flooding production fluid is composed of the following components in mass percentage: polyether block copolymer 50%, polyether polyol 40%, esterified end-capped polyether surfactant 10% %.

[0044] The polyether block copolymer is prepared by reacting the following raw materials in mass percentage: 3.4% of propylene glycol, 30.7% of propylene oxide, 65.6% of ethylene oxide, and 0.3% of potassium hydroxide. The preparation steps are: put the initiator propylene glycol in a pear-shaped flask, vacuum dehydrate at 95°C for 1 hour; add the catalyst KOH under nitrogen flow, heat at 120°C until the KOH is completely melted, vacuum dehydrate at 80°C for 1 hour, and introduce the dried high pressure while it is hot In the reaction kettle, cover it; replace and remove the air in the reaction kettle twice with nitrogen, set the speed at 240 rpm, add the required EO monomer at 100°C, and carry out the polymerization react...

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Abstract

The invention discloses a demulsification water purifying agent for combination-flooding produced fluid and a preparation method for the demulsification water purifying agent and belongs to the technical field of petroleum extraction. The demulsification water purifying agent is prepared from the following ingredients in percentage by mass: 45% to 50% of polyether block copolymer, 30% to 40% of polyether polyol and 10% to 20% of esterification-terminated polyether surfactant, wherein the polyether block copolymer is multiblock polyether of polyoxyethylene and polyoxypropylene which takes propylene glycol as an initiator, the polyether polyol is polyethylene oxide ether which takes propylene glycol as an initiator, and the esterification-terminated polyether surfactant is diblock esterification-terminated polyether of polyoxyethylene and polyoxypropylene which takes propylene glycol as an initiator. The demulsification water purifying agent has the actions of demulsification, agglomeration-flocculation, adsorption-displacement and the like. By adding the demulsification water purifying agent into the combination-flooding produced fluid, other flocculation water purifying agents are not required to be added during the treatment of dehydrated sewage, and thus the effect of achieving two purposes by one agent can be achieved.

Description

technical field [0001] The invention relates to a demulsification water purifying agent for composite flooding production fluid, and at the same time, relates to a preparation method of the demulsification water purifying agent, belonging to the technical field of petroleum exploitation. Background technique [0002] At present, most of Henan oilfields have entered the middle and late stages of oil development, and the water content in the produced fluid is as high as 95%. Chemical flooding technology has become the leading technology for sustained and stable production in Henan oilfields. Among many chemical flooding technologies, associative polymer / alkali / surfactant ASP flooding (ASP) can not only expand the swept volume of the displacement fluid in the oil layer, but also reduce the final residual oil saturation of the oil layer. because of its large-scale use. While the ASP flooding technology improves oil recovery, the surfactants, alkalis and polymers in the produced...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G33/04C02F1/40C08G65/28C08G65/32C02F103/10
CPCC02F1/40C02F2103/10C08G65/2609C08G65/3322
Inventor 李景全彭森郑亚妮刘晓军倪明镜闫雪华杜妍刘约安贾玉拓
Owner CHINA PETROLEUM & CHEM CORP
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