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Polymer mobility control agent suitable for high-temperature and high-salinity harsh reservoir and preparation method of polymer mobility control agent

A high-temperature, high-salt, polymer technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of high temperature resistance, high salinity resistance and long-term stability of polymers that cannot meet the requirements of tertiary oil recovery, etc., to achieve Contributes to long-term aging performance, facilitates chain growth, and reduces production energy consumption

Active Publication Date: 2015-03-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] One of the technical problems to be solved by the present invention is that the high temperature resistance, high salinity resistance and long-term stability of polymers in the prior art cannot meet the requirements of tertiary oil recovery. Flow rate control agent, the polymer has the characteristics of high-efficiency viscosity increase, temperature resistance and salt resistance (thickening in a certain range when encountering salt, thickening when temperature rises), long-term stability, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add 2500g of deionized water to the reaction kettle, add 430g of acrylamide (AM), 150g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 3.5g of sodium 2-acrylamidotetradecylsulfonate (NaAMC 14 S), 4.5g of acryloyloxyethyltrimethylammonium chloride (DAC), neutralized to neutral with NaOH, then added 0.04g of disodium edetate, 7g of urea, 0.07g of isopropanol, and stirred until completely dissolved. Adjust the pH value to 8.9 with NaOH, and start to feed high-purity nitrogen gas. After 30 minutes, the temperature in the kettle was lowered to 15°C, and then 10 g of 0.2% sodium bisulfite aqueous solution, 0.5% methacrylic acid N,N-di 10g of methylaminoethyl ester (DMAEMA) aqueous solution, 10g of 0.5% azobisisobutylamidine hydrochloride, 10g of 0.3% potassium persulfate aqueous solution, continue to pass nitrogen gas for 30min and then seal. After 1 hour, the reaction temperature was gradually raised to 52°C. After 3.5 hours of reaction, a gel-like polymer product...

Embodiment 2

[0045] (2) First add 2600g of deionized water to the reaction kettle, add 480g of acrylamide (AM), 130g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 4.0g of 2-acrylamido dodecyl Sodium sulfonate (NaAMC 12S), 7.8g methacryloxyethyltrimethylammonium chloride (DMC) and 5.0g nitrogen vinylpyrrolidone (NVP), neutralized to neutral with NaOH, then added disodium edetate 0.045 g, urea 7.0g, isopropanol 0.06g, stir until completely dissolved. Adjust the pH value to 9.0 with NaOH, and start feeding high-purity nitrogen gas. After 30 minutes, the temperature in the kettle was lowered to 16°C, and then 10.2 g of 0.2% aqueous sodium bisulfite solution, 0.5% acrylic acid N,N-dimethyl Aminoethyl ester (DA) aqueous solution 11g, 0.5% azobisisobutylamidine hydrochloride 11.9g, 0.3% potassium persulfate aqueous solution 11.2g, continue to pass nitrogen gas for 30min and then seal. After 1 hour, the reaction temperature was gradually raised to 58°C. After 3 hours of reaction, a gel-li...

Embodiment 3

[0049] Add 2700g of deionized water to the reaction kettle, add 500g of acrylamide (AM), 150g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 5.2g of sodium 2-acrylamido hexadecylsulfonate (NaAMC 16 S) and 9.4g dimethyl diallyl ammonium chloride (DMDAAC), neutralized to neutral with NaOH, then added 0.05g disodium edetate, 8.0g urea, 0.07g isopropanol, stirred until completely dissolved. Use NaOH to adjust the pH value to 9.5, and start to feed high-purity nitrogen gas. After 30 minutes, lower the temperature in the kettle to 20°C, and then add 10.2 g of 0.2% aqueous sodium bisulfite solution, 0.5% acrylic acid N,N-dimethyl Aminoethyl ester (DA) aqueous solution 12.1g, 0.5% 2,2'-azo[2-(2-imidazolin-2-yl)propane] dihydrochloride 12g, 0.3% potassium persulfate aqueous solution 11g, Continue to pass nitrogen gas for 30 minutes before sealing. After 1 hour, the reaction temperature was gradually raised to 55°C. After 2.5 hours of reaction, a gel-like polymer product was ob...

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Abstract

The invention relates to a polymer mobility control agent suitable for a high-temperature and high-salinity harsh reservoir and a preparation method of the polymer mobility control agent, and the polymer mobility control agent is mainly used for solving the problems that the polymer in the prior art is poor in heat and salt resistance and long-term stability, and cannot meet the requirements of tertiary oil recovery. In order to better solve the problems, the technical scheme adopted by the invention is as follows: an amphoteric hydrophobic association polymer is prepared from the following raw materials in parts by weight: 5-99.9 parts of a non-ionic water-soluble monomer, 0-50 parts of an anionic monomer or / and cationic monomer, 0.1-10 parts of a hydrophobic monomer with surface activity, 0-20 parts of a viscosity stabilizer and 0-20 parts of a surfactant. The preparation method can be applied to industrial production and application of the polymer mobility control agent for the high-temperature and high-salinity harsh reservoir.

Description

technical field [0001] The invention relates to a polymer fluidity control agent suitable for high-temperature, high-salt harsh oil reservoirs and a preparation method thereof. Background technique [0002] After primary and secondary oil recovery in major domestic oil fields, the water content of crude oil continues to increase, and some large oil fields have entered the stage of tertiary oil recovery. Polymer flooding is the main technical method of tertiary oil recovery. The oil flooding mechanism is clear, the process is relatively simple, and the technology is becoming more and more mature. It is an effective technical measure for enhancing oil recovery. The oil displacement mechanism of the polymer is mainly to use the viscosity of the water-soluble polyacrylamide molecular chain to improve the mobility ratio of the displacement fluid, increase the displacement efficiency and the swept volume, so as to achieve the purpose of enhancing the recovery factor. Due to the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/34C08F226/10C08F226/02C08F220/06C08F4/40C08F4/04C08F6/00C09K8/588
Inventor 夏燕敏苏智青于志省宋晓芳许汇
Owner CHINA PETROLEUM & CHEM CORP
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