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Monoperfluoroctyl containing fluorinated polysiloxane surfactant and oil-based foam oil-displacing agent

A surfactant, perfluorooctyl technology, applied in the field of fluorosilicon surfactants and oil-based foam oil displacement agents, can solve the problems of low surface energy, difficult foam formation, and difficult stability

Active Publication Date: 2018-10-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, compared with water, the surface energy of oil is extremely low, foam formation is difficult, and it is not easy to stabilize. Therefore, the conventional foaming agents used in water-based oil displacement agents cannot meet the requirements for forming suitable oil-based foams.

Method used

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  • Monoperfluoroctyl containing fluorinated polysiloxane surfactant and oil-based foam oil-displacing agent
  • Monoperfluoroctyl containing fluorinated polysiloxane surfactant and oil-based foam oil-displacing agent
  • Monoperfluoroctyl containing fluorinated polysiloxane surfactant and oil-based foam oil-displacing agent

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0051] Among them, R 1 is selected from methyl or ethyl; R 2 Be selected from methyl or ethyl; n is 6-22; preparation method comprises the following steps:

[0052] reacting perfluorooctane with dialkylchlorosilane to obtain product A; reacting product A with ethylene oxide to obtain product B; reacting product B with stearic acid to obtain a fluorosilicon surfactant.

[0053] In the above-mentioned preparation method provided by this embodiment, product A is a compound in which one chlorine in dialkylchlorosilane is replaced by perfluorooctyl; product B is a compound in which the other chlorine in dialkylchlorosilane is replaced by polyethylene oxide Substituted compounds. Product B undergoes esterification reaction with stearic acid, and the terminal hydroxyl group of polyethoxy group and stearic acid can be esterified to obtain fluorosilicone surfactant.

[0054] In the preparation method provided in this embodiment, common solvents in the art can be used. But for the p...

experiment example 1

[0078] Put 40g of perfluorooctane and 12g of dimethylchlorosilane in the reactor, protect it with nitrogen, stir at 60°C for 1.5h, add concentrated sulfuric acid to the system (to make the pH reach about 2), raise the temperature to 150°C, and slowly Add 60g of ethylene oxide, continue the reaction for 1.5h, cool down to about 100°C, add 28g of stearic acid and react for 1.5h, add sodium hydroxide to adjust the pH value to 7, and obtain a fluorosilicon surfactant (dimethyl-mono perfluorooctylsilicone-polyethoxy-stearate) liquid.

[0079] After testing and calculation, the average number n of polyethoxy repeating units in this example is 16.6.

[0080] Infrared Characterization

[0081] Since the n value in the prepared dimethyl-monoperfluorooctyl silicon-polyethoxy-stearate is in a data range, its molecular weight is not a single result, and a very complex fragment structure will be formed in the mass spectrum, which cannot be carried out Analysis, therefore, is not suitable...

experiment example 2

[0086] Put 40g of perfluorooctane and 9.4g of dimethylchlorosilane in the reactor, protect it with nitrogen, stir at 60°C for 1.5h, add concentrated sulfuric acid to the system (to make the pH reach about 2), raise the temperature to 150°C, Slowly add 40g of ethylene oxide, continue the reaction for 1.5h, cool down to about 100°C, add 25g of stearic acid to react for 1.5h, add sodium hydroxide to adjust the pH value to 7, and obtain - Liquid polyethoxy-stearate.

[0087] After testing and calculation, the average number n of polyethoxy repeating units in this example is 12.5.

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Abstract

The invention provides a monoperfluoroctyl containing fluorinated polysiloxane surfactant and an oil-based foam oil-displacing agent. The structure of the monoperfluoroctyl containing fluorinated polysiloxane surfactant is as follows: perfluoroctyl, two short chain alkyls and a specific-polymerization degree poly-ethyoxyl are connected to an silicon atom; and the other end of the poly-ethyoxyl isconnected with stearic acid through an ester group. The test shows that the fluorinated polysiloxane surfactant having the structure shows excellent foam-stabilizing performance, particularly in an emulsion taking oil as a continuous phase. Meanwhile, the surfactant further has an excellent foaming performance. Therefore, the fluorinated polysiloxane surfactant can be used to prepare the oil-basedfoam oil-displacing agent excellent in both foaming and foam-stabilizing performances (the foaming volume is more than 300%, and the half foam life period is more than 72h).

Description

technical field [0001] This specification relates to a fluorosilicone surfactant containing a single perfluorooctyl group and an oil-based foam oil displacement agent. Background technique [0002] Foam fluid has been used in oilfield development for more than 40 years at home and abroad. Foam fluid is used in conventional oil flooding, profile control, steam foam flooding, steam foam huff and puff, circulating steam foam flooding, drainage and gas recovery of water-bearing gas wells, and sand flushing. Many aspects of oil and gas field development, such as well drilling, profile control, water plugging, acidification, cement cementing and fracturing, have been applied and achieved positive results. [0003] A large number of practices have shown that foam flooding is an important means to protect oil layers, prevent oil layer pollution, and increase oil and gas production. With the continuous improvement of people's recognition of foam technology, foam flooding means and f...

Claims

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Application Information

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IPC IPC(8): B01F17/54B01F17/42C09K8/584C09K23/54C09K23/42
CPCC09K8/584C09K23/00
Inventor 侯庆锋章峻郭东红王哲郑晓波莫宏沈健
Owner PETROCHINA CO LTD