High-efficiency water-soluble viscosity-reducing oil-washing agent for heavy oil thermal recovery and preparation method of oil-washing agent

A technology for thermal recovery of heavy oil and oil washing agent, which is applied in the field of chemical agents, can solve the problems of no obvious effect and weak recovery rate, and achieves the effects of wide source of raw materials, easy acquisition, transportation and storage, and clean and pollution-free process.

Active Publication Date: 2020-01-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently reported high-temperature-resistant chemical agents, such as the high-temperature-resistant foam agent 300°C that has been widely promoted in Shengli Oilfield, and the resistance factor under the condition of residual oil is greater than 20; the interfacial tension of the developed high-temperature-resistant oil displacement agent is reduced to 10 at 300°C -3 The ultra-low level of the level, in the field implementation, the first cycle generally has obvious precipitation and oil increase effects, and when the second and third cycles are repeated, there is no obvious effect, and the subsequent further improvement of oil recovery is weak

Method used

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  • High-efficiency water-soluble viscosity-reducing oil-washing agent for heavy oil thermal recovery and preparation method of oil-washing agent
  • High-efficiency water-soluble viscosity-reducing oil-washing agent for heavy oil thermal recovery and preparation method of oil-washing agent
  • High-efficiency water-soluble viscosity-reducing oil-washing agent for heavy oil thermal recovery and preparation method of oil-washing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Add 1mol toluene diisocyanate, 0.4mol polymethylsiloxane (7) and 1219.05g solvent water into a four-neck flask with a thermometer, reflux condenser and stirrer, heat while stirring, and the stirring rate The heating temperature is 400rpm, the heating temperature is 30°C, nitrogen gas is introduced, and the ventilation time is 3min. Next, 0.88g of the catalyst dibutyltin laurate is slowly added to the four-necked flask, and nitrogen gas is continued to be introduced, and the heating temperature of the four-necked flask is raised to 80 °C, the stirring rate was adjusted to 500 rpm, the reaction was continued for 4 h, and then the temperature was lowered to room temperature to obtain an intermediate mixture.

[0026] (2) Add 1.0mol polyoxyethylene ether (4) to the above intermediate mixture, adjust the stirring rate to 500rpm, adjust the temperature to 75°C, mix well, react for 2h, and cool down to 25°C to obtain the final product mixed liquid.

[0027] (3) Use a rota...

Embodiment 2

[0031] (1) Add 1mol toluene diisocyanate, 0.45mol polymethylsiloxane (9) and 1741.5g solvent water into a four-neck flask with a thermometer, reflux condenser and stirrer, heat while stirring, and the stirring rate The heating temperature is 500rpm, the heating temperature is 45°C, nitrogen gas is introduced, and the ventilation time is 5min. Next, 1.74g of the catalyst dibutyltin laurate is slowly added to the four-necked flask, and nitrogen gas is continued to be introduced, and the heating temperature of the four-necked flask is raised to 85 °C, the stirring rate was adjusted to 550 rpm, the reaction was continued for 5 h, and then the temperature was lowered to room temperature to obtain an intermediate mixture.

[0032] (2) Add 1.05mol of polyoxyethylene ether (6) to the above-mentioned intermediate mixture, adjust the stirring speed to 560rpm, adjust the temperature to 85°C, mix well, react for 3h, and cool down to 28°C to obtain the final product mixed liquid.

[0033]...

Embodiment 3

[0037] (1) Add 1mol toluene diisocyanate, 0.5mol polymethylsiloxane (12) and 2089.8g solvent water into a four-necked flask with a thermometer, a reflux condenser and a stirrer, and heat while stirring. The heating temperature is 550rpm, the heating temperature is 60°C, nitrogen gas is introduced, and the ventilation time is 7min. Next, 2.08g of the catalyst dibutyltin laurate is slowly added to the four-necked flask, and nitrogen gas is continued to be introduced, and the heating temperature of the four-necked flask is raised to 95 °C, the stirring rate was adjusted to 600 rpm, the reaction was continued for 5 h, and then the temperature was lowered to room temperature to obtain an intermediate mixture.

[0038] (2) Add 1.2mol of polyoxyethylene ether (8) to the above-mentioned intermediate mixture, adjust the stirring rate to 600rpm, adjust the temperature to 90°C, mix well, react for 4h, and cool down to 30°C to obtain the final product mixed liquid.

[0039] (3) Use a rot...

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Abstract

The invention relates to a chemical agent used in the process of heavy oil recovery, and in particular relates to a high-efficiency water-soluble viscosity-reducing oil-washing agent for heavy oil thermal recovery and a preparation method of the oil-washing agent. The viscosity-reducing oil-washing agent is formed by reacting toluene diisocyanate with polymethylsiloxane to form an intermediate, and reacting the intermediate with polyoxyethylene ether, wherein the molar ratio of the toluene diisocyanate to the polymethylsiloxane and to the polyoxyethylene ether is 1:(0.4-0.5):(1-1.2), and preferably 1:0.45:1.05. The viscosity-reducing oil-washing agent provided by the invention has the dual functions of high-efficiency oil washing and emulsifying and viscosity reducing, can reduce viscosityof ordinary heavy oil and extra-heavy oil by more than 98%, and has the static oil washing rate of more than 50% at a concentration of 1000 ppm; at the same time, the oil-washing agent has strong salt and temperature resistance, and is suitable for heavy oil thermal recovery development, the salt resistance achieves 100000 mg/L or more, the temperature resistance achieves 320 DEG C or more, so that the oil-washing agent can fully meet application conditions in a conventional thermal recovery heavy oil reservoir field.

Description

technical field [0001] The invention relates to a chemical agent used in the heavy oil exploitation process, in particular to a viscosity-reducing oil washing agent for stripping crude oil from rocks and emulsifying and reducing viscosity in the thermal recovery of heavy oil. Background technique [0002] Heavy oil occupies a large proportion of the world's oil and gas resources. According to statistics, the reserves of heavy oil, super heavy oil and natural bitumen in the world are about 1000×10 8 t. China's heavy oil bitumen resources are widely distributed, and more than 70 heavy oil fields have been discovered in 12 basins. It is estimated that China's heavy oil bitumen resources can reach 300×10 8 t above. At present, the main methods of mining heavy oil in my country are steam huff and puff and steam flooding. Steam flooding is currently one of the more successful heavy oil reservoir conversion development technologies in terms of technology and economy. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C08G18/76C08G18/61C08G18/48
CPCC08G18/283C08G18/61C08G18/7614C09K8/584
Inventor 钱钦郑万刚翟勇徐鹏孙克己赵晓刘廷峰郑昕邹斌郝婷婷
Owner CHINA PETROLEUM & CHEM CORP
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