Preparation method of liquid carbon dioxide thickening agent

A technology of liquid carbon dioxide and thickening agent, applied in the preparation of liquid carbon dioxide thickening agent, in the field of anhydrous fracturing fluid, can solve the problems of reservoir damage, affecting fracturing stimulation, reducing reservoir permeability, etc., to increase the viscosity , the effect of improving the dissolution

Inactive Publication Date: 2017-08-15
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using conventional mining methods is easy to form water lock in the reservoir, and the permeability of the reservoir is reduced, which will cause damage to the reservoir and affect the effect of fracturing to increase production

Method used

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  • Preparation method of liquid carbon dioxide thickening agent
  • Preparation method of liquid carbon dioxide thickening agent
  • Preparation method of liquid carbon dioxide thickening agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of 1,3-dihydroxypropane-2-carbamic acid tert-butyl ester

[0023] Add 6mL of deionized water and 14mL of methanol into the three-necked flask, stir and mix evenly, then add 0.02mol of serinol into the mixed solution, stir to dissolve completely, cool down to 0°C with an ice bath, and then add the three to the mixed solution Slowly add 0.022mol of di-tert-butyl dicarbonate dropwise. During the dropping process, the temperature was kept at 0°C. After 30 minutes, the ice bath was removed, and the reaction was carried out at a constant temperature of 25°C for 4 hours. After the reaction was completed, it was extracted three times with dichloromethane. The solvent methanol and water were distilled off under reduced pressure, and vacuum-dried at 45° C. for 24 hours to obtain the product tert-butyl 1,3-dihydroxypropane-2-carbamate.

[0024] (2) Preparation of perfluorooctanoyl chloride

[0025] Add 0.02mol of perfluorooctanoic acid into another three-necked fl...

Embodiment 2

[0032] (1) Preparation of 1,3-dihydroxypropane-2-carbamic acid tert-butyl ester

[0033] Add 6mL of deionized water and 14mL of methanol into the three-necked flask, stir to dissolve completely, and cool down to 0°C with an ice bath, then slowly add 0.021mol of di-tert-butyl dicarbonate dropwise to the mixed solution of the three, during the dropwise addition , the temperature was kept at 0°C, and after 30 minutes, the ice bath was removed, and the reaction was carried out at a constant temperature of 25°C for 4 hours. After the reaction was completed, extracted three times with dichloromethane, the solvent methanol and water were distilled off under reduced pressure, and dried under vacuum at 45°C After 24h, the product tert-butyl 1,3-dihydroxypropane-2-carbamate was obtained.

[0034] (2) Preparation of perfluorooctanoyl chloride

[0035] Add 0.02mol of perfluorooctanoic acid into another three-necked flask equipped with a condenser, raise the temperature to 75°C, then add ...

Embodiment 3

[0042] (1) Preparation of 1,3-dihydroxypropane-2-carbamic acid tert-butyl ester

[0043] Add 6mL of deionized water and 14mL of methanol into the three-necked flask, stir and mix evenly, take 0.02mol of serinol and add it into the mixed solution, stir to dissolve completely, cool down to 0°C with an ice bath, and then slowly add to the mixed solution of the three. Add 0.023mol of di-tert-butyl dicarbonate dropwise. During the dropwise addition, the temperature was kept at 0°C. After 30 minutes, the ice bath was removed, and the reaction was carried out at a constant temperature of 25°C for 4 hours. The solvent methanol and water were distilled off under pressure, and vacuum-dried at 45°C for 24 hours to obtain the intermediate product 1,3-dihydroxypropane-2-carbamate tert-butyl ester.

[0044] (2) Preparation of perfluorooctanoyl chloride

[0045] Take 0.02mol of perfluorooctanoic acid and add it into another three-necked flask equipped with a condenser, raise the temperature...

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Abstract

The invention relates to a preparation method of a liquid carbon dioxide thickening agent for unconventional oil and gas reservoir development, and can solve the problem of damage to an oil and gas reservoir in a conventional mining mode. The preparation method has the technical scheme that methylbenzene and water are added into a bottle; then, serinol is added; terbutyloxycarbonyl anhydride is dropwise added at 0 DEG C; reaction is performed for 4h at 25 DEG C; distillation is performed to obtain an intermediate product (1); then, perfluoro caprylic acid is added into another bottle; thionyl chloride and N,N-dimethyl formamide are added at 75 DEG C; reaction is performed for 2h; distillation is performed to obtain an intermediate product (2); next, the intermediate product (1) is added into another bottle; the temperature is raised to 75 DEG C; the intermediate product (2) is dropwise added; reaction is performed for 12h at 75 DEG C to obtain an intermediate product (3); finally, dichloromethane and trifluoroacetic acid are added into the bottle; then, the intermediate product (3) is added; reaction is performed for 2h at 25 DEG C; after extraction and vacuum drying, hexamethylene diisocyanate is added to perform reaction for 2 minutes; a final product is obtained. The thickening agent can increase the carbon dioxide viscosity, and can be used for fracturing reformation.

Description

technical field [0001] The invention relates to a water-free fracturing fluid technology for developing unconventional oil and gas reservoirs without using water, in particular to a preparation method of a liquid carbon dioxide thickener containing fluorine elements, and belongs to the field of oilfield chemicals. Background technique [0002] With the continuous development of the economy, oil and natural gas, as an energy reserve, are becoming more and more important. In recent years, my country's oil and natural gas production and imports have increased year by year. In 2014, my country's crude oil imports were 310 million tons, an increase of 9.5% over the same period of the previous year, and natural gas imports were 53 billion cubic meters. An increase of 23.8% over the same period last year. Conventional oil and gas resources can no longer meet the growing demand for oil and gas. Therefore, the development and utilization of unconventional oil and gas resources has g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/62C07C273/18C07C275/10
Inventor 赵金洲周明黄洲补军成邹佳汐陈意萍
Owner SOUTHWEST PETROLEUM UNIV
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