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Emulsifier for oil displacement, preparation method thereof, and binary composite oil displacement agent

An emulsifier and oil-displacement technology, which is applied in the direction of chemical instruments and methods, and drilling compositions, etc., can solve the problems of poor emulsification ability, alkali agent scaling, scaling, etc., and achieves simple preparation methods and high oil displacement efficiency , Strong emulsifying ability

Pending Publication Date: 2020-05-15
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Binary compound oil displacement agent includes emulsifier and polymer, but the emulsification ability is poor, and the efficiency of improving crude oil recovery is low
Ternary compound oil displacement agent includes emulsifier, polymer and alkali agent, which can improve the emulsification effect of the oil displacement agent, thereby improving oil recovery, but alkali agent is easy to cause scaling, which increases the difficulty of subsequent treatment after mining
[0005] The emulsifier provided by the related technology must be used in conjunction with sodium carbonate to achieve a good emulsification effect, but adding sodium carbonate will cause scaling, which will affect the difficulty of subsequent mining treatment

Method used

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  • Emulsifier for oil displacement, preparation method thereof, and binary composite oil displacement agent
  • Emulsifier for oil displacement, preparation method thereof, and binary composite oil displacement agent
  • Emulsifier for oil displacement, preparation method thereof, and binary composite oil displacement agent

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preparation example Construction

[0033] On the one hand, the embodiment of the present invention provides a method for preparing an emulsifier for oil displacement, as shown in the attached figure 1 Shown, this preparation method comprises:

[0034] Step 101, adding fatty alcohol with 14-16 carbon atoms and a catalyst into the reactor, feeding nitrogen into the reactor, heating the reactor to a first preset temperature, and stopping feeding nitrogen.

[0035] By feeding nitrogen into the reactor, the reaction between fatty alcohol and active gas can be avoided.

[0036] Step 102, drop ethylene oxide into the reactor to carry out polymerization reaction, heat the reactor to the second preset temperature, keep it warm, and then cool down to the third preset temperature to obtain an emulsifier for oil displacement; wherein, The mass ratio of fatty alcohol to ethylene oxide is 0.5-1.5:2-3.

[0037] It should be noted that fatty alcohols having 14 to 16 carbon atoms include: fatty alcohols having 14 carbon atoms...

Embodiment 1

[0074] This embodiment provides an emulsifier for oil displacement, which is prepared by the following method: add 1000 kg of fatty alcohol with 14 to 16 carbon atoms into a stainless steel tank reactor, and then add 18 kg of 0.5% by mass of potassium hydroxide solution. Nitrogen gas was fed into the stainless steel tank reactor, and heated to 110° C., and the nitrogen gas feeding was stopped. Add 2500kg of ethylene oxide dropwise to the stainless steel reactor to carry out closed polymerization. Then, the temperature of the stainless steel reactor was raised to 180° C., kept for 2 hours, and then the temperature was lowered to 90° C. to obtain the emulsifier for oil displacement provided in this example.

[0075] The emulsifier for oil displacement includes: 97% of pure emulsifier and 3% of impurities in mass percentage.

Embodiment 2

[0077] This embodiment provides an emulsifier for oil displacement, which is prepared by the following method: add 1000 kg of fatty alcohol with 14 to 16 carbon atoms into a stainless steel tank reactor, and then add 16 kg of 0.3% by mass of potassium hydroxide solution. Nitrogen gas was fed into the stainless steel tank reactor, and heated to 100°C, and the nitrogen gas feeding was stopped. Add 2200kg of ethylene oxide dropwise to the stainless steel reactor to carry out closed polymerization. Then, the temperature of the stainless steel reactor was raised to 170° C., kept for 1.8 hours, and then lowered to 80° C. to obtain the emulsifier for oil displacement provided in this example.

[0078] The emulsifier for oil displacement includes: 95% pure emulsifier and 5% impurities in mass percentage.

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Abstract

The invention discloses an emulsifier for oil displacement, a preparation method thereof, and a binary composite oil displacement agent, and belongs to the field of oilfield chemistry. The preparationmethod comprises the following steps: adding a C14-16 fatty alcohol and a catalyst into a reactor, introducing nitrogen into the reactor, heating the reactor to a first preset temperature, and stopping introducing nitrogen; dropwise adding ethylene oxide into the reactor, carrying out a polymerization reaction, heating the reactor to a second preset temperature, carrying out heat preservation, and then cooling to a third preset temperature to obtain the emulsifier for oil displacement, wherein the mass ratio of the fatty alcohol to the ethylene oxide is (0.5-1.5):(2-3). The emulsifier has theadvantages of good compatibility with polymers, strong emulsifying ability to crude oil, high oil displacement efficiency and wide adaptability, and can reduce the oil-water interfacial tension to 10<-2> mN / m or below in the application of tertiary oil recovery.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to an emulsifier for oil displacement, a preparation method thereof, and a binary composite oil displacement agent. Background technique [0002] Petroleum is a non-renewable resource. With the rapid development of my country's economy, the demand for petroleum is increasing day by day. However, most oilfields in China have entered the stage of ultra-high water cut and need to be exploited by tertiary oil recovery technology. Among them, the tertiary oil recovery technology is the use of chemical flooding agents to exploit oil fields. In tertiary oil recovery, binary compound oil displacement agent and triple compound oil displacement agent are mostly used. Binary compound oil displacement agent includes emulsifier and polymer, but the emulsification ability is poor, and the efficiency of improving crude oil recovery is low. Ternary composite oil displacement agent includes emul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C09K8/584
CPCC08G65/2609C08G65/2648C09K8/584
Inventor 程杰成吴军政丁玉敬
Owner PETROCHINA CO LTD