Anti-shearing polymer and preparation method thereof

A polymer and shear-resistant technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problem of increased probability of polymer molecules being sheared and degraded, poor shear resistance of polymers, polymer Reduce oil displacement efficiency and other problems, achieve good injection ability and fluidity control ability, improve viscosification ability, and improve shear resistance

Inactive Publication Date: 2012-08-15
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the loss of viscosity, the efficiency of polymer flooding is reduced, which seriously affects the effect of polymer flooding
[0006] The following problems exist during polymer flooding in high-temperature and high-salinity reservoirs: (1) Due to the electrostatic shielding effect between cations, the cations will attract the negative charges on the polymer molecules, so that the polymer molecules become uncharged molecules However, curling deformation occurs, the hydrodynamic radius decreases, and the viscosity-increasing property becomes poor; (2) divalent cations (Ca

Method used

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  • Anti-shearing polymer and preparation method thereof
  • Anti-shearing polymer and preparation method thereof
  • Anti-shearing polymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 3.25 grams of the skeleton monomer and 2 grams of maleic anhydride and add them to different beakers respectively, then add 20 grams and 10 grams of dimethyl sulfoxide to stir and dissolve evenly, slowly dissolve the dimethyl sulfoxide solution of the skeleton monomer Add dropwise to the dimethyl sulfoxide solution of maleic anhydride, pass nitrogen gas during the dropwise addition, and place the system in an ice-salt bath, monitor the reaction progress with the pH value, when the pH value of the reaction solution is 4-5 , stop dropping the skeleton monomer solution, continue to stir until the temperature of the reaction liquid system no longer rises, and repeatedly precipitate with chloroform to obtain the functionalized skeleton monomer.

[0044] Weigh 20 grams of acrylamide (AM), 6 grams of acrylic acid (AA), 0.0026 grams, 0.0052 grams, 0.013 grams, 0.026 grams, 0.052 grams, 0.078 grams of functionalized backbone monomers, dimethyl allyl octadecyl Add 0.4 grams...

Embodiment 2

[0046] The functionalized backbone monomer was prepared as in Example 1.

[0047] Weigh 20 grams of acrylamide (AM), 6 grams of acrylic acid (AA), 0.026 grams of functionalized backbone monomers, 0.4 grams, 0.8 grams, 1.2 grams of dimethyl allyl octadecyl ammonium chloride, and 74 grams of distilled water , respectively added to the beaker, stirred and dissolved evenly, adjusted the pH to 6-7 with sodium hydroxide, preheated in a water bath at a temperature of 40°C for 30 minutes, added 0.26 grams each of co-solvent urea and sodium sulfate, chain transfer Agent sodium methoxide 0.052 g, redox initiator sodium bisulfite and ammonium persulfate 4.8 mg each, reacted for 6 hours to obtain three kinds of jelly-like polymers.

[0048] 2. Performance test of shear resistant polymer

[0049] Take a certain amount of HPED01~HPED06, under the condition of 40℃ water bath, use the salinity of 9374.12mg / L to simulate injection water (the ion composition (unit: mg / L) is: Na + +K + 3091.9...

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Abstract

The invention relates to an anti-shearing polymer and a preparation method thereof. The polymer is a copolymer composed of acrylic amide, sodium acrylate, hydrophobic monomer dimethyl allyl-N-alkyl ammonium chloride and a functionalized framework monomer. The average molecular weight of the copolymer is 6 million. The preparation method comprises the following steps of: (1) respectively dissolving a polyamide-amide macromolecular framework monomer and maleic anhydride (or acryloyl chloride and acrylic anhydride) into dimethyl sulfoxide; slowly dropwise adding a framework monomer solution intoa maleic anhydride solution; introducing nitrogen and placing the system into an ice salt bath; when the pH (Potential of Hydrogen) value of a reaction solution is 4-5, stopping dropwise adding the framework monomer solution; and utilizing chloroform to repeatedly precipitate to obtain the functionalized framework monomer; and (2) carrying out free radical water solution polymerization on the acrylic amide, acrylic acid, the hydrophobic monomer and the functionalized framework monomer. The anti-shearing polymer and the preparation method thereof have the advantages of reliable principle and convenience for operation; and the synthesized polymer still has good tackifying capability under high-temperature, high-salinity and strong shearing effects.

Description

technical field [0001] The invention relates to a shear-resistant polymer and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] Polymer flooding technology is the main technical means to enhance oil recovery in my country's oilfield development, and has achieved certain success in technology and economy. Polymer flooding technology has been widely used in tertiary oil recovery at home and abroad, and has broad application prospects. With the development of the national economy and the further exploitation of oil and gas resources, the requirements for enhanced oil recovery are becoming more and more urgent. [0003] In order to improve the effect of polymer flooding and meet the requirements of increasingly harsh reservoir conditions, higher requirements are put forward for the stability of water-soluble polymers, such as higher viscosity-increasing ability and stability. Stability mainly includes shear stability, chemi...

Claims

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Application Information

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IPC IPC(8): C08F290/00C08F220/56C08F220/06C08F226/02C09K8/588
Inventor 施雷庭叶仲斌李继晖王颂夏周琨凌郑川江董杰徐杰
Owner SOUTHWEST PETROLEUM UNIV
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