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Permeable modified viscosity-reducing oil-displacing agent for water drive thickened oil as well as preparation method of oil-displacing agent

An oil-displacing agent and modification technology, applied in the field of chemical agents, can solve the problems of difficult viscosity-lowering agent efficiency, large oil-water mobility ratio, etc., and achieve the effects of clean process, no pollution, reduced use concentration, and simple synthesis process.

Inactive Publication Date: 2020-01-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems in the prior art that it is difficult to effectively produce heavy oil reservoirs under low power conditions and that conventional viscosity reducers have low efficiency and high oil-water mobility ratio, and provides a heavy oil depolymerization and dispersion method under no power conditions. Viscosity-reducing polymer-type viscosity-reducing agent that can change reservoir wettability. This viscosity-reducing agent can withstand salinity of 50,000mg / L, temperature resistance of 150°C, and can adapt to water flooding heavy oil with a viscosity of 500-5000mPa.s For oil reservoirs, when the concentration is 500ppm, the viscosity of heavy oil can be reduced to below 100mPa.s

Method used

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  • Permeable modified viscosity-reducing oil-displacing agent for water drive thickened oil as well as preparation method of oil-displacing agent
  • Permeable modified viscosity-reducing oil-displacing agent for water drive thickened oil as well as preparation method of oil-displacing agent
  • Permeable modified viscosity-reducing oil-displacing agent for water drive thickened oil as well as preparation method of oil-displacing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add 1 mol of 2-acrylamide-2-methylpropanesulfonic acid and 0.1 mol of allyl alcohol polyoxyethylene ether into a four-necked flask with a thermometer, reflux condenser, and stirrer, and heat while stirring , The stirring rate is 200 rpm, the heating temperature is 30°C, and the nitrogen is introduced for 5 minutes.

[0029] (2) Then add 0.88g sodium bisulfite and 0.88g ammonium persulfate solution, continue to pass nitrogen, raise the heating temperature of the four-neck flask to 70℃, adjust the stirring rate to 500rpm, and turn off the heat source and stirrer after 4 hours of reaction. After cooling to room temperature, pour it into a beaker to obtain a crude product.

[0030] (3) Wash the above-mentioned crude product with 1362.2g of absolute ethanol for 3 times, and then place it in an oven at 60°C for 24 hours to obtain a white solid material, which is crushed and sieved with a pulverizer to obtain a white powder with a mesh number of 300-500, namely Permeable modif...

Embodiment 2

[0037] (1) Add 1 mol of 2-acrylamide-2-methylpropanesulfonic acid and 1.5 mol of allyl alcohol polyoxyethylene ether into a four-neck flask with a thermometer, reflux condenser, and stirrer, and heat while stirring , The stirring rate is 300 rpm, the heating temperature is 45°C, the nitrogen is introduced, and the nitrogen is introduced for 6 minutes.

[0038] (2) Then add 0.80g sodium bisulfite and 0.88g ammonium persulfate solution, continue to pass in nitrogen, raise the heating temperature of the four-neck flask to 75℃, adjust the stirring rate to 520rpm, and turn off the heat source and stirrer after 6 hours of reaction. After cooling to room temperature, pour it into a beaker to obtain a crude product.

[0039] (3) Wash the above crude product 4 times with 1486.3g of absolute ethanol, and then place it in an oven at 65°C for 26 hours to obtain a white solid material, which is crushed and sieved with a pulverizer to obtain a white powder with a mesh number of 300-500, namely ...

Embodiment 3

[0046] (1) Add 1 mol of 2-acrylamide-2-methylpropanesulfonic acid and 4.8 mol of allyl alcohol polyoxyethylene ether into a four-necked flask with a thermometer, reflux condenser, and stirrer, and heat while stirring , The stirring rate is 350 rpm, the heating temperature is 52 ℃, nitrogen is introduced, and the time of nitrogen is 7 minutes.

[0047] (2) Then add 1.2g sodium bisulfite and 1.42g ammonium persulfate solution, continue to pass in nitrogen, raise the heating temperature of the four-neck flask to 80°C, adjust the stirring rate to 560rpm, and turn off the heat source and stirrer after reacting for 5 hours. After cooling to room temperature, pour it into a beaker to obtain a crude product.

[0048] (3) Wash the above crude product 5 times with 1568.7g of absolute ethanol, and then place it in an oven at 73°C for 25h to obtain a white solid material, which is crushed and sieved with a pulverizer to obtain a white powder with a mesh number of 300-500, namely Permeable mod...

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Abstract

The invention relates to a chemical agent used in the exploitation process of thickened oil, in particular to a viscosity-reducing oil-displacing agent for water drive thickened oil and with effects of changing reservoir wettability and permeation depolymerization. The permeable modified viscosity-reducing oil-displacing agent is formed by performing free radical polymerization on 2-acrylic amide-2-methylpropanesulfonic acid and allyl alcohol polyoxyethylene ether in water, wherein the molar ratio of the 2-acrylic amide-2-methylpropanesulfonic acid to the allyl alcohol polyoxyethylene ether is1:(0.1-7), preferably 1:1.5. The molecular weight of the permeable modified viscosity-reducing oil-displacing agent is 8000 to 100000 g / mol. The viscosity reducer can resist mineralization degree of50000, can resist temperature of 150 DEG C, can adapt to a water drive thickened oil reservoir with the viscosity of 500 to 5000 mPa*s; and when the use concentration is 500 ppm, the viscosity of thethickened oil can be reduced to be less than 100 mPa*s. Therefore, the permeable modified viscosity-reducing oil-displacing agent can be widely applied to development of the water drive thickened oil.

Description

Technical field [0001] The invention relates to a chemical agent used in the process of heavy oil exploitation, in particular to a viscosity-reducing oil-displacing agent used for water-flooding heavy oil and having the functions of changing reservoir wettability and penetration depolymerization. Background technique [0002] my country is rich in heavy oil resources. With the continuous demand for energy from economic development, heavy oil will become one of the main battlefields of my country's future oil exploitation. my country's heavy oil fields mainly adopt two development methods. The reservoirs with underground crude oil viscosity below 5000mPa.s are often developed by water injection (accounting for about 18% of the production of heavy oil). The average recovery rate of water injection development is about 23%; those with viscosity greater than 5000mPa.s are developed by steam injection. (Accounting for about 82% of heavy oil production). Due to the high viscosity of h...

Claims

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Application Information

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IPC IPC(8): C09K8/588C08F283/06C08F220/58
CPCC08F283/065C09K8/588
Inventor 郑万刚汪庐山徐鹏刘冬青姜亦栋刘恒张雷徐福海王超宋丹
Owner CHINA PETROLEUM & CHEM CORP
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