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A kind of zwitterionic copolymer oil displacement agent and its synthesis method

A zwitterion and oil displacement agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor salt resistance, shear thinning, high temperature degradation, etc., and achieve good temperature and salt resistance and Increased shear resistance, viscosity, temperature and salt resistance, and the effect of enhanced oil recovery

Inactive Publication Date: 2016-09-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, polymer flooding widely used at home and abroad is mainly polyacrylamide (PAM) or partially hydrolyzed polyacrylamide (HPAM) (Sun Huanquan et al. Polymer flooding technology [M]. Petroleum University Press. 2002, 1-4 ), but PAM or HPAM has the disadvantages of shear thinning, high temperature degradation, and poor salt resistance (Guo Y.J., Liu J.X., Zhang X.M. et al.Solution Property Investigation of Combination FloodingSystems Consisting of Gemini-Non-ionic Mixed Surfactant and Hydrophobically Associating Polyacrylamide for Enhanced Oil Recovery. Energy Fuels, 2012, 26(4): 2116-2123)
In the tertiary oil recovery stage, with the increase of formation temperature, the conformational free energy of polymer macromolecular chains increases, so that the viscosity retention rate decreases with the increase of temperature; at the same time, during pipeline transportation, the viscosity of polymer flooding The retention rate is reduced by high shear; in addition, inorganic ions will have a charge shielding effect on the molecular chain, causing the polymer chain to shrink and curl, so that the viscosity of PAM or HPAM will drop sharply with the increase of salinity, and then Make PAM or HPAM not meet the requirements of industry, and affect the wide use of PAM or HPAM (Anupom S, Arun B, Inamul H.Adsorption behavior of poly(N,N-dimethyl acrylamide-co-na-acrylamido-2-methylpropanesulfonate) onsand surface[J].Journal of Applied Polymer Science,2004,91(4):2482–2490)

Method used

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  • A kind of zwitterionic copolymer oil displacement agent and its synthesis method
  • A kind of zwitterionic copolymer oil displacement agent and its synthesis method
  • A kind of zwitterionic copolymer oil displacement agent and its synthesis method

Examples

Experimental program
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Embodiment 1

[0023] Embodiment 1: Synthesis of AM / AA / NXBH / NMQS tetrapolymer

[0024] The preparation method of polymer AM / AA / NXBH / NMQS is as follows: a. Add 0.03g NXBH, 0.01g NMQS and 10.00g deionized water into a 100mL beaker according to the ratio in Table 1, stir until completely dissolved, and transfer to a three-necked flask ; b. Add 7.00gAM, 2.96gAA and 30.00g deionized water in another beaker, stir until completely dissolved, and transfer to the three-necked flask in step a; c. Slowly add 20 mass % NaOH solution, adjust the pH of the solution to 7 and cool to room temperature; d. Add a certain amount of deionized water to prepare the solution into an aqueous solution with a concentration of 10-20% by mass of the total monomer mass, and keep it in a constant temperature water bath at 40°C Nitrogen deoxygenation and stirring for 10-20min; e. Add initiator ammonium persulfate solution and sodium bisulfite solution (ammonium persulfate and sodium bisulfite molar ratio is 1:1), the amoun...

Embodiment 2

[0027] Embodiment 2: AM / AA / NXBH / NMQS tetrapolymer structure characterization

[0028] The polymer AM / AA / NXBH / NMQS obtained in embodiment 1 is carried out structural analysis, specifically as follows:

[0029] The IR spectrum of polymer AM / AA / NXBH / NMQS, such as figure 1 Shown: 3444.24-3228.25cm -1 There is a broad stretching vibration peak in the range, which is due to the -OH and -NH 2 Caused by peak overlap; 1679.69cm -1 It is the stretching vibration peak of -C=O; at 1560.12cm -1 is -CH in NXBH 3 Affected by the positive charge of -N-, it is caused by moving to the high wave number region; 1454.06cm -1 、1401.99cm -1 and 1320.99cm -1 is the characteristic peak of β-cyclodextrin ring structure.

Embodiment 3

[0030] Embodiment 3: Investigation of the shear property of AM / AA / NXBH / NMQS tetrapolymer copolymer

[0031] The quaternary polymer prepared in Example 1 was formulated into a 3000mg / L aqueous solution, and at 25°C, the HAAKERheoStress6000 rheometer was used at 12-1000s -1 Under the conditions, the change of the apparent viscosity of the polymer aqueous solution with the shear rate is measured, and the data are as follows: figure 2 . From figure 2 It can be seen that the apparent viscosity of the polymer decreases gradually with the increase of the shear rate. When the shear rate is 100s -1 , the apparent viscosity of the polymer solution is 270mPa·s; when the shear rate increases to 1000s -1 , the apparent viscosity of the polymer solution is 101mPa·s, relative to 12s -1 When the viscosity retention rate can reach 22.19%, the results show that the polymer is 1000s at the shear rate -1 It has obvious shear resistance under the conditions.

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Abstract

The invention relates to a zwitterionic acrylamide copolymer oil-displacing agent containing a beta-cyclodextrin structure, which can improve the recovery ratio of crude oil, and a synthesis method thereof. The technical scheme is as follows: four monomers, namely acrylamide, acrylic acid, 6-(allyl-amino)-beta-cyclodextrin NXBH and N-methyl-N-allyl morpholine quaternary ammonium salt NMQS are used for preparing an AM / AA / NXBH / NMQS copolymer. The synthesis method comprises the following steps: preparing AM, AA, NXBH and NMQS into 10-20wt% of water solution, regulating pH, stirring and introducing nitrogen for 10-20min; adding ammonium persulfate and sodium hydrogen sulfite, continuously introducing N2, and reacting at the constant temperature of 30-50 DEG C for 8-12h; washing with anhydrous ethanol, crushing and drying to prepare the polymer Am / AA / NXBH / NMQS. The polymer has the advantages of better temperature resistance, salt resistance and shear resistance, and can improve the recovery ratio by 12.31% in an indoor simulated oil-displacing experiment.

Description

technical field [0001] The invention relates to a zwitterionic acrylamide copolymer oil-displacing agent containing β-cyclodextrin structure for improving oil recovery and a synthesis method thereof. Background technique [0002] Polymer flooding is to add a certain amount of water-soluble high molecular weight polymer to the injected water to increase the viscosity of the injected water, reduce the water phase permeability and improve the oil-water mobility ratio, so as to expand the volume sweep coefficient and achieve enhanced oil recovery. Rate (Zhao Yongsheng, Wei Guozhang, Lu Huimin, etc. Some understandings on whether polymer flooding can improve oil displacement efficiency [J]. Acta Petroleum Sinica, 2000, 122(3): 43-46). At present, polymer flooding widely used at home and abroad is mainly polyacrylamide (PAM) or partially hydrolyzed polyacrylamide (HPAM) (Sun Huanquan et al. Polymer flooding technology [M]. Petroleum University Press. 2002, 1-4 ), but PAM or HPAM ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C08F290/10C08F220/56C08F220/06C08F226/06
CPCC08F290/10C09K8/588C08F220/56
Inventor 苟绍华罗珊叶仲斌蒋文超蔡潇潇何杨
Owner SOUTHWEST PETROLEUM UNIV