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Preparation method of water soluble AM-AA-modified nanometer SiO2 functional monomer terpolymer oil displacement agent

A technology of terpolymers and functional monomers, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of polymer solution viscosity reduction, recovery effect reduction, impact, etc., and achieve strong temperature resistance , the effect of enhanced oil recovery

Inactive Publication Date: 2015-11-25
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of polymer can achieve ideal oil enhancement effects when used in low-temperature, low-salinity reservoirs, but its enhanced oil recovery effect is greatly reduced when used in high-temperature and high-salinity reservoirs
In addition, because the polymer solution will be sheared by agitators, pipeline valves, injection pumps, blastholes and porous media during the injection process, the viscosity of the polymer solution will be greatly reduced, and the polymer flooding will enhance oil recovery. The effect is seriously affected

Method used

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  • Preparation method of water soluble AM-AA-modified nanometer SiO2 functional monomer terpolymer oil displacement agent
  • Preparation method of water soluble AM-AA-modified nanometer SiO2 functional monomer terpolymer oil displacement agent
  • Preparation method of water soluble AM-AA-modified nanometer SiO2 functional monomer terpolymer oil displacement agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 Modified nano-SiO 2 Synthesis of functional monomers

[0026] Add 1.0 g nano-SiO to a 500 ml round bottom flask 2 , 0.05g 3-aminopropyltriethoxysilane and 80mL anhydrous toluene, reacted at 80°C for 12h, the reaction product was washed with absolute ethanol, and then dried in vacuum at 80°C to obtain modified nano-SiO 2 . Add 30.0ml of N,N-dimethylformamide and 0.5g of maleic anhydride to a 250ml Erlenmeyer flask. After stirring and dissolving completely, add 2.0g of modified nano-SiO to the solution 2 , and then stirred and reacted at 60°C for 6h, the reaction product was washed with distilled water, filtered, and dried to obtain modified nano-SiO 2 functional monomer.

Embodiment 2A

[0027] Example 2AM-AA-modified nano-SiO 2 Synthesis of Functional Monomer Terpolymer Oil Displacing Agent

[0028] First add 0.044g modified nano-SiO in a 100ml three-necked flask 2 Functional monomer, 8.206gAM and 2.750gAA, adjust the pH value to 7.3 with sodium hydroxide, add distilled water and be made into the aqueous solution that the total mass concentration of monomer is 22%; When temperature rises to 40 ℃, add 0.022g initiator ( The molar ratio of ammonium persulfate and sodium bisulfite is 1:1), under the protection of nitrogen, react at a temperature of 40°C for 6 hours; the reaction product is washed with ethanol, pulverized, and dried to obtain a terpolymer.

Embodiment 3

[0029] Example 3AM-AA-modified nano-SiO 2 Characterization of Functional Monomer Terpolymer Oil Displacing Agent

[0030] The infrared spectrogram of the oil displacement agent synthesized by embodiment 2 is as follows figure 1 As shown, the N-H stretching vibration absorption peak is located at 3402.3cm -1 ;-CH 2 The stretching vibration absorption peak is located at 2943.1cm -1 ;C=O stretching vibration absorption peak is located at 1668.92cm -1 ;-NH bending vibration absorption peak (in-plane) absorption peak is located at 1558.9cm -1 ; C-N stretching vibration absorption peak is located at 1396.4cm -1 ;-NH bending vibration absorption peak (out-of-plane) absorption peak is located at 650.3cm -1 ; SiO 2 The characteristic absorption peak is located at 1116.2cm -1 and 780.4cm -1 .

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Abstract

The invention relates to a preparation method of a water soluble AM-AA-modified nanometer SiO2 functional monomer terpolymer oil displacement agent. The preparation method comprises 1, mixing a modified nanometer SiO2 functional monomer, acrylamide and acrylic acid, adjusting pH to 7.3 by sodium hydroxide, and adding distilled water into the mixed solution to obtain an aqueous solution with a monomer total mass concentration of 22%, and 2, heating the aqueous solution to a temperature of 40 DEG C, adding an initiator into the aqueous solution, feeding nitrogen protective gas into the aqueous solution, carrying out a reaction process at a temperature of 40 DEG C for 6h, washing the reaction product by ethanol, and carrying out crushing and drying to obtain the terpolymer, wherein the raw materials comprise, by mass, 70-80% of acrylamide, 19.8-29.5% of acrylic acid and 0.2-0.5% of a modified nanometer SiO2 functional monomer. The oil displacement agent has performances of resisting a high temperature, salt and shearing and can satisfy real demand of high temperature high salt oil reservoir yield improvement.

Description

technical field [0001] The present invention relates to the technical field of petroleum exploitation, more specifically, the present invention relates to a kind of water-soluble AM-AA-modified nano SiO 2 A preparation method of a functional monomer terpolymer oil displacement agent. Background technique [0002] As a non-renewable resource, petroleum plays an important role in the fields of industry and national defense. In order to increase the production life of the oil field and increase the output of the oil field, the use of polymer flooding is an important technology. Polymer flooding refers to adding a small amount of polymer to the injected water to increase the viscosity of the water phase and reduce the permeability of the oil layer to increase the sweep coefficient and enhance the recovery factor. At present, polymer flooding has entered the stage of industrialization in my country's Daqing Oilfield, Shengli Oilfield, Dagang Oilfield, Jilin Oilfield, and Henan ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/56C08F220/06C08F4/40C09K8/588
Inventor 赖南君郭欣李屹洋叶仲斌唐雷
Owner SOUTHWEST PETROLEUM UNIV
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