High-injection salt-resistant polymer for oil recovery, ternary composite system and preparation method thereof

A polymer and high-injection technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of increasing dosage and reducing, and achieve the effects of enhancing ductility, high injection performance, and improving curling degree

Inactive Publication Date: 2019-06-04
大庆再创科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the problem is that the salt content (that is, salinity) of the extracted sewage is much higher than that of clear water. The presence of salt makes the viscosity of the polymer solution prepared from the extracted sewage much lower than that of the polymer solution prepared with clear water. If you continue to use Conventional polyacrylamide requires a substantial increase in the amount (increased by more than 50%), so without increasing the amount of polymer, it is necessary to improve the anti-salt viscosity-increasing performance of polyacrylamide

Method used

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  • High-injection salt-resistant polymer for oil recovery, ternary composite system and preparation method thereof
  • High-injection salt-resistant polymer for oil recovery, ternary composite system and preparation method thereof
  • High-injection salt-resistant polymer for oil recovery, ternary composite system and preparation method thereof

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preparation example Construction

[0054] The present invention also provides the preparation method of above-mentioned polymer, specifically comprises the following steps:

[0055] The first step, by mass parts, 100 parts of raw materials include:

[0056] 2-acrylamido-2-methylpropanesulfonic acid AMPS (x monomer) 3.5-5 parts,

[0057] Acrylamide AM (y monomer) 18-20 parts,

[0058] N-acryloyl-N'-R base-piperazine (a monomer) 0.05-0.1 part,

[0059] 0.01-0.05 parts of 2-acryloylthiophene (monomer b),

[0060] OP-10 surfactant (OP-10 is octylphenol ethoxylate-10, chemical formula C 32 h 58 o 10 , CAS # : 9002-93-1, HLB value: 14.5, non-ionic surfactant, commonly used emulsifier) ​​0.1-0.5 parts,

[0061] Polymerization Catalyst 3-Aminopropionitrile H 2 NCH 2 CH 2 CN0.02-0.04 parts,

[0062] Ammonium persulfate ((NH 4 ) 2 S 2 o 8 )0.0002-0.0005 copies,

[0063] Sodium bisulfite (Na 2 SO 3 )0.0006-0.001 part,

[0064] Azobisisoheptanonitrile (C 12 h 24 N 4 )0.01-0.02 parts,

[0065] the res...

Embodiment 1

[0072] Add 737.8g of distilled water to a 1L jar, then add 10g of sodium hydroxide, mix well, then slowly add 50g of functional monomer AMPS, after the AMPS is completely dissolved in a constant temperature water bath below 15°C, add N-acryloyl-N'-R group -Piperazine 0.5g, then add 2g of OP-10 surfactant, stir evenly, add 200g of acrylamide monomer AM, adjust the pH value to 12, then cool down to -2°C; % of high-purity nitrogen for 10 minutes, add polymerization catalyst 3-aminopropionitrile and disodium EDTA 0.01g, continue to pass nitrogen to remove oxygen for 20 minutes, then add 0.2 g of azobisisoheptanonitrile, and then pass nitrogen to remove oxygen for 20 minutes. Add 0.008 g of ammonium persulfate, and then add 0.02 g of sodium bisulfite after 2 minutes, then continue to pass nitrogen gas until the solution becomes viscous and then seal it.

[0073] After the temperature of the solution rises to the highest value, cool down naturally for 2 hours, and the reaction system ...

Embodiment 2

[0075] First add 774g of distilled water to a 1L beaker, then add 7g of sodium hydroxide, mix well, then slowly add 35g of functional monomer AMPS, after the AMPS is completely dissolved in a constant temperature water bath below 15°C, add N-acryloyl-N'-Ryl-piperazine 1.0g, then add 2g of OP-10 surfactant, stir evenly, add 180g of acrylamide monomer AM, adjust the pH value to 12.5, then cool down to -5°C; Deoxygenate with high-purity nitrogen for 10 minutes, add polymerization catalyst 3-aminopropionitrile and 0.05 g of disodium EDTA, continue to pass nitrogen gas for deoxygenation for 20 minutes, then add 0.15 g of azobisisoheptanonitrile, and then pass nitrogen gas for deoxygenation for 20 minutes, then add persulfuric acid Ammonium 0.008g, 0.02g sodium bisulfite was added after 2 minutes, and then nitrogen gas was continued until the solution became viscous and then sealed.

[0076] After the temperature of the solution rises to the highest value, cool down naturally for 2 ...

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Abstract

The invention discloses a high-injection salt-resistant polymer for oil recovery, a ternary composite system and a preparation method thereof. The monomers thereof comprise acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and N-acryloyl-N'-R-piperazine. By introducing the monomers with a heterocyclic structure and a sulfonic acid group onto a polyacrylamide molecular chain, compression strength of the molecular chain is raised, hydrophilicity of the molecular chain and the microscopic reversible network structure are improved, and then resistance of shrinkage and rotation is enhanced. Thereby, the degree of crimping of the polymer molecular chain in the brine is improved, larger hydrodynamic volume is retained, salt resistance is enhanced macroscopically, and viscosity of the polymerof the brine is greatly improved.

Description

technical field [0001] The present invention relates to the technical field of polymers in ternary compound oil displacement systems used in the process of oil extraction, in particular to a polymer with high injectivity and salt resistance for oil recovery, a ternary compound system containing this polymer, and the Polymer preparation methods. Background technique [0002] With the continuous acceleration of oilfield exploitation, most oilfields in my country and even in the world have entered the stage of high water cut. This puts forward new requirements and challenges on how to further enhance oil recovery. Nowadays, polymer flooding and related chemical flooding technologies have become important technical means for tertiary oil recovery, and are also indispensable supporting technologies for enhancing the effect of water injection in oilfields, realizing stable production of oil reservoirs, and enhancing oil recovery. [0003] Polymer flooding mainly increases the vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C08F220/56C08F220/58C08F220/34C08F220/38
Inventor 白清贤丁志光孔柏林
Owner 大庆再创科技有限公司
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