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A kind of phenylboronic acid polymer and its preparation method and its application in modified xanthan gum
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A technology of polymer and xanthan gum, applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of limited temperature resistance, high production cost of xanthan gum, and large dosage.
Active Publication Date: 2022-04-12
CHINA NAT OFFSHORE OIL CORP +1
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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.
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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, a preparation method thereof and an application in modified xanthan gum. The structural formula of the phenylboronic acid polymer is shown in formula I. The compounded phenylboronic acid polymer and xanthan gum provided by the present invention have obvious viscosities to the xanthan gum solution, wherein the molar ratio of the phenylboronic acid monomer is 1.0mol% of the polymer P-1.0% in pure water. The viscosity-increasing range of the xanthan gum solution is 43.8%, and the viscosity-increasing range is as high as 56.4% in 8074mg / L mineralized water, and the existence of micro-crosslinked structure in the compound system is proved by the rheological curve. The xanthan gum modified by the phenylboronic acid polymer of the present invention has good aging resistance and degradation resistance in pure water and mineralized water, and at the same time, the compound system has strong anti-interference performance to ethylene glycol and 1,3-propylene glycol . The composite system of the phenylboronic acid polymer and xanthan gum of the invention can be used as a polymer oil displacement agent, which can increase the viscosity of the displacement fluid, expand the swept volume and increase the recovery factor.
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...
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