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Phenylboronic acid polymer and preparation method and application thereof in modified xanthan gum

A technology of polymer and phenylboronic acid, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of limited temperature resistance, high production cost and large dosage of xanthan gum, and achieve enhanced viscosity and good anti-aging Effects of degradability and strong anti-interference

Active Publication Date: 2020-11-03
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production cost of xanthan gum is high, the dosage is large, the temperature resistance is limited, and it is prone to thermal degradation in high temperature oil layers.

Method used

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  • Phenylboronic acid polymer and preparation method and application thereof in modified xanthan gum
  • Phenylboronic acid polymer and preparation method and application thereof in modified xanthan gum
  • Phenylboronic acid polymer and preparation method and application thereof in modified xanthan gum

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Experimental program
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Effect test

Embodiment 1

[0038] The synthesis of embodiment 1, terpolymer P (AM-co-DMAPAM-co-AMBB)

[0039] The synthetic route is as follows:

[0040]

[0041] N-(3-dimethylaminopropyl) acrylamide contains a polymerization inhibitor p-methoxyphenol (MEHQ), and the monomer needs to be purified before polymerization. The treatment method is: monomer N-(3- Dimethylaminopropyl) acrylamide is separated and purified by basic alumina (100-200 mesh) chromatography column (column height 8cm), rinsed with anhydrous ether, and the eluate is dried in a vacuum oven after rotary evaporation After 24 hours, the monomer changed from yellow to colorless before removing the inhibitor.

[0042] The polymerization steps are as follows: weigh acrylamide (AM), N-(3-dimethylaminopropyl)acrylamide (DMAPAM), and 3-acrylamide phenylboronic acid (AMBB) according to the ratio in Table 1, and dissolve them in deionized water (the total mass fraction of three kinds of monomers is 10%), vacuumize and lead to N 2 Deoxygenate ...

Embodiment 2

[0065] Embodiment 2, polymer P (AM-co-DMAPAM-co-AMBB) to the modification research of xanthan gum

[0066] Dissolve xanthan gum with deionized water under stirring at room temperature to prepare xanthan gum mother liquor with a mass concentration of 2.5g / L, mix and dilute it with 20g / L phenylboronic acid polymer mother liquor in proportion to the target compounding concentration , stirred at room temperature to mix well. The concentration of xanthan gum in the compound solution is 2.0g / L, and the concentration of phenylboronic acid polymer is 0, 20, 100, 200, 300, 400, 500, 600mg / L respectively. According to the standard Q / HS 2032-2018 [21] The viscosity of the compound solution was measured to evaluate the viscosity-increasing performance of the compound system.

[0067] 1. Viscosity of compound system

[0068] The concentration of xanthan gum is 2.0g / L. With the change of the amount of phenylboronic acid polymer P(AM-co-DMAPAM-co-AMBB), the viscosity of the compound syste...

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Abstract

The invention discloses a phenylboronic acid polymer as well as a preparation method and application thereof in modified xanthan gum. The structural formula of the phenylboronic acid polymer is shownas a formula I in the specification. The phenylboronic acid polymer provided by the invention has obvious tackifying effect on xanthan gum solution after being compounded with xanthan gum, wherein thetackifying amplitude of the polymer P-1.0% of which the molar ratio of phenylboronic acid monomers is 1.0 mol% on the xanthan gum solution in pure water reaches 43.8%, and the tackifying amplitude ofthe polymer P1.0% of which the molar ratio of phenylboronic acid monomers is 1.0 mol% in 8074 mg / L mineralized water reaches 56.4%; and the existence of a micro-crosslinking structure in a compounding system is proved through a rheological curve. The xanthan gum modified by the phenylboronic acid polymer has good anti-aging degradability in pure water and mineralized water, and meanwhile, a compound system has relatively strong anti-interference performance on ethylene glycol and 1,3-propylene glycol; therefore, the compound system of the phenylboronic acid polymer and xanthan gum can be usedas a polymer oil displacement agent, wherein the viscosity of displacement fluid can be improved, the swept volume can be enlarged, and the recovery ratio can be increased.

Description

technical field [0001] The invention relates to a phenylboronic acid polymer, a preparation method thereof and an application in modified xanthan gum, belonging to the technical field of polymer flooding. Background technique [0002] At present, there are two types of polymer oil displacement agents commonly used in oilfields: synthetic polymers and natural polymers, among which partially hydrolyzed polyacrylamide (HPAM) and its derivatives and xanthan gum (XC) are representative. Xanthan gum is an exopolysaccharide produced by fermentation of Xanthomonas bacterium. It is composed of D-glucose, D-mannose and D-glucuric acid in a molar ratio of 2.8:2.0:2.0. Its molecular weight can reach 2×10 6 ~5×10 7 g / mol. Compared with partially hydrolyzed polyacrylamide (HPAM), xanthan gum still has higher viscosity under high temperature and high salinity conditions, and has stronger shear resistance, is not easily adsorbed by reservoir rocks, and can be successfully adjusted Oil w...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/60C08F230/06C09K8/588
CPCC08F220/56C09K8/588C08F220/60C08F230/065
Inventor 侯胜珍王秀军华朝张健孙哲朱玥珺
Owner CHINA NAT OFFSHORE OIL CORP
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