Polymer mobility control agent suitable for ultrahigh-salinity oil deposit and preparation method thereof

A high salinity and compound technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of high temperature resistance, high salinity resistance and shear resistance that cannot meet the requirements of tertiary oil recovery, etc. Controllable molecular weight, strong association, excellent temperature and salt resistance

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 shear resistance of polymers in the prior art cannot meet the requirements of tertiary oil recovery. High-efficiency polymer fluidity control agent, the polymer has the characteristics of high-efficiency thickening, temperature resistance and salt resistance (thickening in a certain range when encountering salt, thickening when temperature rises), thermal stability and excellent shear resistance

Method used

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  • Polymer mobility control agent suitable for ultrahigh-salinity oil deposit and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] First add 2500g of deionized water to the reaction kettle, add 430g of acrylamide (AM), 150g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 2.5g of sodium 2-acrylamidotetradecylsulfonate (NaAMC 14 S), 3.5g 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 48°C. After 3.5 hours of reaction, a gel-like polymer produ...

Embodiment 2

[0050] First add 2600g of deionized water to the reaction kettle, add 480g of acrylamide (AM), 130g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 3.0g of 2-acrylamido sodium dodecylsulfonate (NaAMC 12 S) and 4.2g of methacryloxyethyltrimethylammonium chloride (DMC), neutralized to neutral with NaOH, then added 0.045g of disodium edetate, 7.0g of urea, 0.06 of isopropanol g. Aluminum sol 15g, stirred 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 52°C. After 3 hours of reaction, a gel-like polymer ...

Embodiment 3

[0053] First add 2700g of deionized water to the reaction kettle, add 500g of acrylamide (AM), 150g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 130g of acrylic acid, 3.2g of 2-acrylamido hexadecyl Sodium sulfonate (NaAMC 16 S) and 5.2g dimethyl diallyl ammonium chloride (DMDAAC), neutralized to neutral with NaOH, then added 0.05g disodium edetate, 8.0g urea, 0.07g isopropanol, oxidized Calcium 0.5g, 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 ...

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Abstract

The invention relates to a polymer mobility control agent suitable for an ultrahigh-salinity oil deposit and a preparation method thereof, and the polymer mobility control agent is mainly used for solving the problem that a polymer can not meet the requirement for tertiary oil recovery due to poor temperature resistant property, salt resistant property and shearing resistant property in the prior art. In order to better solve the problem, the technical scheme adopted by the invention is as follows: the control agent for an amphoteric hydrophobic associated polymer comprises the following components in parts by weight of the amphoteric hydrophobic associated polymer: 5-99.9 parts of nonionic water-soluble monomers, 0-50 parts of anionic monomers or/and cationic monomers, 0.1-10 parts of hydrophobic monomers with surface activity, 0.1-5 parts of inorganic substances and 1-20 parts of surface active agents. The preparation method disclosed by the invention can be used for the industrial production of the polymer mobility control agent suitable for the ultrahigh-salinity oil deposit.

Description

technical field [0001] The invention relates to a polymer fluidity control agent suitable for ultra-high salinity 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 long tertiary o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/34C08F220/06C08F226/02C08F4/40C08F4/04C08F8/12C09K8/588
Inventor 夏燕敏宋晓芳苏智青许汇蔡红
Owner CHINA PETROLEUM & CHEM CORP
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