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Silicofluoride surfactant containing three perfluorooctyl groups and oil-based foam oil-displacing agent

A surfactant and foam flooding technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as difficult stability, difficult foam formation, and low surface energy

Inactive Publication Date: 2018-10-23
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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  • Silicofluoride surfactant containing three perfluorooctyl groups and oil-based foam oil-displacing agent
  • Silicofluoride surfactant containing three perfluorooctyl groups and oil-based foam oil-displacing agent
  • Silicofluoride surfactant containing three perfluorooctyl groups and oil-based foam oil-displacing agent

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] Wherein, n is 6-22; The preparation method comprises the following steps:

[0048] reacting perfluorooctane with trichlorosilane 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.

[0049] In the above preparation method provided by this embodiment, product A is a compound in which three chlorines in trichlorosilane are replaced by perfluorooctyl groups; product B is hydrogen in trichlorosilane (three perfluorooctyl groups to hydrogen With activating effect) the compound after being substituted by polyethoxy group. When the product B is reacted with stearic acid, the esterification of the terminal hydroxyl group of the polyethoxy group with stearic acid can occur, thereby obtaining the fluorosilicone surfactant.

[0050] In the preparation method provided in this embodiment, common solvents in the art can be used. But for the preferred scheme, since the main reac...

experiment example 1

[0073] Put 100g of perfluorooctane and 11g of trichlorosilane 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 50g Ethylene oxide, continue to react for 1.5h, lower the temperature 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 a surfactant containing fluorosilicone (triperfluorooctylsilyl- polyethoxy-stearate) liquid.

[0074] After testing and calculation, the average n of the number of polyethoxy repeating units in this example is 16.7.

[0075] Infrared Characterization

[0076] Because the n value in the prepared triperfluorooctyl silicon-polyethoxy-stearate is 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 analyzed. Therefore, Mass spectrometry is not applica...

experiment example 2

[0081] Put 100g of perfluorooctane and 15g of trichlorosilane 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 56g Ethylene oxide, continue to react for 1.5h, lower the temperature to about 100°C, add 22g of stearic acid to react for 1.5h, add sodium hydroxide to adjust the pH value to 7, and obtain triperfluorooctyl silicon-polyethoxy-hard fatty acid ester liquid.

[0082] After testing and calculation, the average n of the number of polyethoxy repeating units in this example is 16.8.

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Abstract

The specification provides a silicofluoride surfactant containing three perfluorooctyl groups and an oil-based foam oil-displacing agent, wherein the silicofluoride surfactant has the following structure: three perfluorooctyl groups and a polyethyoxyl group in special polymerization degree are connected to a silicon atom, and the other end of the polyethyoxyl group is connected to stearic acid viaan ester group. A test proves that the silicofluoride surfactant in such structure has excellent foam stabilizing performance, especially in an emulsion with oil being a continuous phase; meanwhile,the surfactant has great foaming performance, so that by means of the silicofluoride surfactant, the oil-based foam oil-displacing agent which has excellent foaming and foam stabilizing performances at the same time can be prepared, foaming quantity reaching more than 300% and foam half-life period being longer than 72 h.

Description

technical field [0001] This specification relates to a fluorosilicon surfactant containing triperfluorooctyl 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 foam flooding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C08G65/26
CPCC09K8/584C08G65/2639
Inventor 侯庆锋章峻郭东红郑晓波莫宏沈健
Owner PETROCHINA CO LTD