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Water-soluble am‑aa‑modified nano-sio 2 Functional monomer terpolymer oil displacing agent

A technology of terpolymer and functional monomer, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of reduced viscosity of polymer solution, reduced recovery effect, influence, etc., and achieves strong temperature resistance. , the effect of enhancing oil recovery

Inactive Publication Date: 2018-01-23
SOUTHWEST PETROLEUM UNIV +1
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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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  • Water-soluble am‑aa‑modified nano-sio <sub>2</sub> Functional monomer terpolymer oil displacing agent
  • Water-soluble am‑aa‑modified nano-sio <sub>2</sub> Functional monomer terpolymer oil displacing agent
  • Water-soluble am‑aa‑modified nano-sio <sub>2</sub> Functional monomer terpolymer oil displacing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 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 vacuum-dried 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 2

[0027] Example 2 AM-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 monomers, 8.206g AM and 2.750gAA, adjust the pH value to 7.3 with sodium hydroxide, add distilled water to make an aqueous solution with a total monomer mass concentration of 22%; when the temperature rises to 40°C, 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 3 AM-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 water soluble AM-AA-modified nanometer SiO2 functional monomer terpolymer oil-displacement agent. The oil-displacement agent is a terpolymer composed of, by mass, 70 to 80% of acrylamide (AM), 19.8 to 29.5% of acrylic acid (AA) and 0.2 to 0.5% of modified nanometer SiO2 functional monomer. The oil-displacement agent provided by the invention has high viscosity at a high shear rate, has strong temperature resistance, salt resistance and anti-shearing capability and can improve crude oil recovery through polymer flooding.

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 Functional monomer terpolymer oil displacing 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 Oilfield, and has achieved g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C08F292/00C08F220/56C08F220/06
Inventor 赖南君周宁叶仲斌唐雷郭欣
Owner SOUTHWEST PETROLEUM UNIV
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