Xanthan gum graft copolymer oil displacement agent as well as preparation method and application thereof

A technology of grafting copolymer and xanthan gum, which is applied in drilling compositions, chemical instruments and methods, and mining fluids, etc., can solve problems such as easy degradation, low XG-g-AMPS grafting rate, easy deposition, etc. problems, to achieve the effect of improving heat resistance and biological stability, improving grafting rate and grafting efficiency, and developing cost-effective

Active Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the three types of reservoir conditions with high temperature and high salinity, although xanthan gum has obvious advantages over HPAM, it still cannot fully meet the requirements of the three types of reservoirs, mainly due to the following disadvantages of xanthan gum: ① Xanthan gum solution Poor biodegradation resistance, easy to cause loss of solution viscosity; ②Poor heat resistance stability, easy to degrade under high temperature and high salt conditions; ③The degree of enhanced oil recovery is not obvious
[0009] Compared with xanthan gum, the temperature resistance and biological stability of XG-g-AM and XG-g-AMPS reported in the literature have been improved to a certain extent, but they still cannot be used as EOR oil displacement agents, mainly because: The dissolution rate of XG-g-AM is too slow and the filtration ratio is high, which does not meet the requirements of oilfield field operations; while the grafting rate of XG-g-AMPS is low, it is easy to deposit when injected into the formation, and cannot play the role of oil displacement

Method used

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  • Xanthan gum graft copolymer oil displacement agent as well as preparation method and application thereof
  • Xanthan gum graft copolymer oil displacement agent as well as preparation method and application thereof
  • Xanthan gum graft copolymer oil displacement agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Embodiment 1 Preparation of heat-resistant and salt-resistant xanthan gum graft copolymer of the present invention

[0070] At room temperature, add 1g of xanthan gum and 100g of distilled water into a 250mL three-neck flask, stir well to completely dissolve the xanthan gum, and then blow high-purity nitrogen gas into it to remove oxygen. Add 6.43g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) into the reaction vessel, stir until completely dissolved; continue to blow high-purity nitrogen into the reaction vessel to remove oxygen by bubbling for more than 20 minutes. Put the three-neck flask in a constant temperature water bath at 55°C, under nitrogen protection, add 0.02g of ammonium cerium nitrate, react at 55°C for 5 minutes, add 0.2g of ammonium persulfate, 0.6g of sodium bisulfite, and 2g of acrylamide (AM) was formulated into a 50% aqueous solution and slowly added dropwise to the reaction vessel, reacted at 55°C for 3 hours, precipitated the product with ex...

Embodiment 2

[0080] Embodiment 2 Preparation of heat-resistant and salt-resistant xanthan gum graft copolymer of the present invention

[0081]At room temperature, add 1g of xanthan gum and 100g of distilled water into a 250mL three-neck flask, stir well to completely dissolve the xanthan gum, and then blow high-purity nitrogen gas into it to remove oxygen. Add 3.44g of N-vinylpyrrolidone (NVP) into the reaction vessel, stir until completely dissolved; continue to pass high-purity nitrogen into the reaction vessel to remove oxygen by bubbling for more than 20 minutes. Put the three-neck flask in a constant temperature water bath at 55°C, under nitrogen protection, add 0.02g of ammonium cerium nitrate, react at 55°C for 5 minutes, add 0.2g of ammonium persulfate, 0.6g of sodium bisulfite, and 2g of acrylamide (AM) was formulated into a 50% aqueous solution and slowly added dropwise to the reaction vessel, reacted at 55°C for 3 hours, precipitated the product with excess acetone, and complet...

Embodiment 3

[0084] Embodiment 3 Preparation of heat-resistant and salt-resistant xanthan gum graft copolymer of the present invention

[0085] At room temperature, add 1g of xanthan gum and 100g of distilled water into a 250mL three-neck flask, stir well to completely dissolve the xanthan gum, and then blow high-purity nitrogen gas into it to remove oxygen. Add 2.79g of N,N-dimethylacrylamide into the reaction vessel and stir until completely dissolved; continue to blow high-purity nitrogen into the reaction vessel to remove oxygen by bubbling for more than 20 minutes. Put the three-neck flask in a constant temperature water bath at 55°C, under the protection of nitrogen, add 0.02g ammonium cerium nitrate, react at 55°C for 5 minutes, add 0.2g ammonium persulfate, 0.6g sodium bisulfite, and 5.83g AMPS The 50% aqueous solution was slowly added dropwise into the reaction vessel, reacted at 55°C for 3 hours, the product was precipitated with excess acetone, and completely dried at 50°C to ob...

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Abstract

The invention provides a xanthan gum graft copolymer oil displacement agent as well as a preparation method and application thereof. Based on molecular design, at least two of acrylamide (AM), 2-acrylamido-2-methylpropane sulfonic acid (AMPS), N-vinylpyrrolidone (NVP) and N,N-dimethylacrylamide (DMAM) are graft-copolymerized to xanthan gum macromolecules. Since the copolymerized side chain is introduced, the viscoelasticity, heat resistance and biological stability of the xanthan gum macromolecules can be greatly enhanced; the xanthan gum graft copolymer can be used as an oil displacement agent for tertiary oil recovery simultaneously; and the solution rate of the xanthan gum graft copolymer is obviously increased, and the xanthan gum graft copolymer can not easily generate gel in brine. When the xanthan gum graft copolymer oil displacement agent is used in a high-temperature high-salinity oil reservoir, the oil displacement effect is enhanced.

Description

technical field [0001] The invention relates to a water-soluble polymer in the field of tertiary oil recovery, in particular to a xanthan graft copolymer oil displacement agent and its preparation method and application. Background technique [0002] Today, domestic oilfields have generally entered a period of high water-cut development, polymer flooding EOR technology represented by high-molecular-weight partially hydrolyzed polyacrylamide (HPAM) has been effective, and in a low-temperature, low-salt environment , Secondary reservoirs are widely used. However, in view of the formation conditions of high temperature and high salinity in the three types of oil reservoirs, high molecular weight partially hydrolyzed polyacrylamide (HPAM) has poor salt tolerance, easy hydrolysis, easy degradation, complexation with divalent metal ions such as calcium and magnesium, and easy formation The actual oil displacement efficiency in the three types of reservoirs has been greatly reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C08F251/00E21B43/22
Inventor 杜凯李勇伊卓刘晓光林蔚然计文希魏小林祝纶宇赵方园
Owner CHINA PETROLEUM & CHEM CORP
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