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Amphoteric ionic polymer clay stabilizer and preparation method

A clay stabilizer and zwitterion technology, applied in the field of zwitterionic polymer clay stabilizer and preparation, can solve the problems of high temperature resistance, formation loss and shear resistance and high cost, and achieve good temperature and salt resistance and shear resistance. The effect of improving the stability, increasing the rigidity of the molecule

Inactive Publication Date: 2012-09-12
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above types of clay stabilizers have improved the temperature and salt resistance of polymers to a certain extent, they still show certain deficiencies in high temperature resistance, formation loss, shear resistance, etc., and the cost in practical applications is relatively high.

Method used

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  • Amphoteric ionic polymer clay stabilizer and preparation method
  • Amphoteric ionic polymer clay stabilizer and preparation method
  • Amphoteric ionic polymer clay stabilizer and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Preparation of NAO monomer

[0031] Add 42.3g of oleic acid to the reactor, slowly add 10.2g of phosphorus trichloride under stirring, the feeding temperature is controlled at 10~15℃, after the addition, the temperature is raised to 55℃, after 4h, the lower layer liquid is separated and the upper layer liquid The unreacted phosphorus trichloride was removed by evaporation, yielding 98.8% oleyl chloride; 18.7g of the oleyl chloride obtained in the previous step was diluted with dichloromethane solvent and put into a constant pressure dropping funnel for use, and then placed in 250ml of dry trichloride. Add 4g of allylamine to the neck flask, dilute with dichloromethane solvent, then add 7.6g of triethylamine and 0.02g of hydroquinone, slowly add the ready-to-use oleyl chloride solution in an ice bath with constant stirring, and control the drop for 1h Finished; reaction at room temperature for 5h after dripping, the reaction solution was washed with water, acid w...

Embodiment 2

[0032] Example 2: Preparation of AM / NaAA / DMDAAC / NAO quaternary polymer

[0033] First weigh AA and dilute with 10g deionized water according to the ratio in Table 1, slowly add sodium hydroxide in an ice bath, and cool to room temperature; add the NAO prepared above into a 250ml three-neck flask, and then add OP-10 to emulsify Add AM and DMDAAC after emulsification is complete, then add NaAA solution, adjust the pH to 8 with NaOH solution, and blow nitrogen for 20 minutes; then add initiator sodium bisulfite solution, then add persulfuric acid Ammonium solution, nitrogen gas for 10min, at a temperature of 45 o React for 10h at C; finally wash five times with absolute ethanol, crush, 40 o C constant temperature drying to prepare AM / NaAA / DMDAAC / NAO quaternary polymer.

[0034]

Embodiment 3

[0035] Example 3: Structural characterization of AM / NaAA / DMDAAC / NAO quaternary polymer

[0036] The infrared spectrum of the quaternary polymer AM / NaAA / DMDAAC / NAO synthesized in Example 2 is as follows figure 1 Shown. The figure shows the infrared spectrum of the polymer at 3443 cm -1 A strong absorption peak is generated at the O-H stretching vibration at 3194 cm -1 There is a strong absorption peak corresponding to the N-H stretching vibration at 2923 cm -1 And 2875cm -1 The strong absorption peak is -CH 3 And -CH 2 -The stretching vibration at 1675cm -1 It is the stretching vibration of -C=O, which proves that there is an amide structure in the polymer molecule, and the product is AM / NaAA / DMDAAC / NAO quaternary polymer.

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Abstract

The invention relates to an amphoteric ionic polymer clay stabilizer and a preparation method thereof. The polymer has water solubility, is low in use level and shows excellent temperature resistance and shear resistance. According to the technical scheme, the amphoteric ionic polymer clay stabilizer is prepared from the following raw materials and monomers in percentage by mass: 53.5-59.9 percent of acrylamide AM; 40-45 percent of sodium acrylate NaAA (obtained from neutralization of crylic acid and sodium hydroxide), 0.1-1.5 percent of N-allyl oleamide NAO and 0.1-1.5 percent of dimethyl diallyl ammonium chloride DMDAAC. The preparation method comprises the following steps: firstly adding NAO in a reactor, then adding an emulsifier and water; after complete emulsification, adding AM, NaAA, DMDAAC to prepare a solution with the total mass percentage concentration of monomer being 10-25 percent, adjusting pH to be 6-8, and introducing N2 for 20 min; then adding an initiator, continuing to introduce N2 for 20 min, and reacting for 8-12 h at 30-70 DEG C; washing with absolute ethyl alcohol, grinding and drying to obtain AM / NaAA / DMDAAC / NAO quadripolymer. The result of an anti-swelling test of 0.2wt% solution shows that the anti-swelling rate can reach 86 percent.

Description

technical field [0001] The invention relates to a zwitterionic polymer clay stabilizer used for polymer flooding in oil reservoirs in the petroleum industry and a preparation method. Background technique [0002] During oilfield drilling, since clay minerals widely exist in oil layers, improper development measures may easily cause hydration expansion, dispersion and migration of clay minerals, and block formation pores Throat of the structure, reducing formation permeability, leading to formation damage. Studies have shown that under the action of the external water environment, the hydration expansion of clay minerals is the main reason for reducing the mechanical strength of rocks and inducing engineering problems. Therefore, in engineering, it is generally used to add clay stabilizers to the working fluid to inhibit the hydration expansion of clay, so as to slow down or inhibit the reduction of rock strength and ensure the stability of the well wall (Liu Xiangjun, Liu H...

Claims

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Application Information

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IPC IPC(8): C09K8/575C08F220/56C08F220/06C08F226/02
Inventor 苟绍华封明明叶仲斌蔡潇潇贾方亮
Owner SOUTHWEST PETROLEUM UNIV
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