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A kind of method of modified xanthan gum and modified xanthan gum oil displacement agent
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A technology of xanthan gum and oil displacing agent, applied in the field of modified xanthan gum, which can solve the problems of limited temperature resistance, high production cost and large dosage of xanthan gum
Active Publication Date: 2022-04-26
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
[0042] The synthesis of embodiment 1, terpolymer P (AM-co-DMAPAM-co-AMBB)
[0043] The synthetic route is as follows:
[0044]
[0045] 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.
[0046] 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
[0069] Embodiment 2, polymer P (AM-co-DMAPAM-co-AMBB) to the modification research of xanthan gum
[0070] 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.
[0071] 1. Viscosity of compound system
[0072] 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 method for modifying xanthan gum and a modified xanthan gum oil displacement agent. The modified xanthan gum oil displacement agent is a mixed aqueous solution of phenylboronic acid polymer and xanthan gum. The structural formula of the phenylboronic acid polymer is shown in formula I. In formula I, x, y and z respectively represent corresponding structural units The molar content in the polymer, x:y:z is 85~89.9:10:0.1~5; the weight average molecular weight of phenylboronic acid polymer is not more than 10 5 g / mol; in the mixed aqueous solution, the mass-volume concentration of phenylboronic acid polymer is 0-600mg / L, but not zero, and the mass-volume concentration of xanthan gum is 1-5g / L. The present invention utilizes phenylboronic acid polymer to modify xanthan gum, improves the viscosity of xanthan gum, anti-aging degradation and anti-interference for ethylene glycol and 1,3-propanediol, and sequentially provides a modified Xanthan gum oil repellant.
Description
technical field [0001] The invention relates to a method for modifying xanthan gum and a modified xanthan gum oil displacement agent, belonging to the technical field of polymer oil displacement. 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 wetting pr...
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