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Nano silicon dioxide/polymer oil-displacing agent and synthesizing method thereof

A technology of nano-silica and synthesis method, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve the problems of reduced polymer viscosity adsorption and retention ability, reduced polymer fluidity control ability, and molecular chain damage. Achieve high viscosity, enhanced oil recovery, and strong shear resistance

Inactive Publication Date: 2013-06-19
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The linear polymers (polyacrylamide and partially hydrolyzed polyacrylamide) widely used in polymer flooding, after being sheared, the molecular chain of the polymer will be destroyed, so that the viscosity of the polymer and the Reduced adsorption and retention capacity, resulting in reduced mobility control of the polymer

Method used

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  • Nano silicon dioxide/polymer oil-displacing agent and synthesizing method thereof
  • Nano silicon dioxide/polymer oil-displacing agent and synthesizing method thereof
  • Nano silicon dioxide/polymer oil-displacing agent and synthesizing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1: the preparation of nano silicon dioxide functional monomer

[0018] First, add 1.54g of nano-silica, 100ml of absolute ethanol, 17.22g of distilled water and 1.58ml of ammonia water with a mass concentration of 28% in a 250ml three-necked flask, and then disperse with ultrasonic wave for 30min; Add 0.22g of vinyltriethoxysilane dropwise; after the vinyltriethoxysilane is added dropwise, react in a water bath at a temperature of 30°C for 18h, centrifuge and dry to obtain a nano-silica functional monomer .

Embodiment 2

[0019] Embodiment 2: the synthesis of nano silica / polymer oil displacement agent

[0020] First add 0.05g of nano-silica functional monomer, 6.50g of acrylamide and 3.45g of acrylic acid into a 250ml three-necked flask, adjust the pH value to 7.0-7.5 with sodium hydroxide solution, and make the total mass concentration of monomers 20% Aqueous solution, nitrogen gas 45min; then add initiator ammonium persulfate solution and sodium bisulfite solution, the molar ratio of ammonium persulfate and sodium bisulfite is 1:1, and the amount of initiator added is 0.5% of the total mass of the monomer , continue to feed nitrogen, and react at a temperature of 45° C. for 8 hours; then wash with absolute ethanol, dry, and pulverize to obtain a terpolymer.

Embodiment 3

[0021] Embodiment 3: Characterization of nano silica / polymer oil displacement agent

[0022] The infrared spectrogram of the nano silicon dioxide / polymer oil displacement agent synthesized by embodiment 2 is as follows figure 1 Shown, -C(O)NH 2 The stretching vibration peak of is located at 3419cm -1 , the stretching vibration peak of -C=O is located at 1675cm -1 , at 1105cm -1 The antisymmetric stretching vibration absorption peak of Si-O is at 780cm -1 is the bending vibration absorption peak of Si-O.

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Abstract

The invention discloses a nano silicon dioxide / polymer oil-displacing agent and a synthesizing method thereof. The oil-displacing agent is a terpolymer consisting of the following raw materials in percentage by mass: 60.5 to 69.9 percent of acrylamide, 30 to 35 percent of crylic acid, and 0.1 to 4.5 percent of nano silicon dioxide functional monomer. The synthesizing method comprises the following steps of: adding the nano silicon dioxide functional monomer, the acrylamide and the crylic acid into a three-neck flask; regulating the pH value to 7.0-7.5 with sodium hydroxide solution to prepare solution with the monomer total mass concentration of between 10 and 20 percent, and introducing nitrogen for 40 minutes; introducing an initiator, and reacting for 4 to 8 hours at 30 to 55 DEG C; and cleaning with absolute ethanol, baking and crushing to obtain terpolymer. The oil-displacing agent is strong in anti-shearing performance, and excellent in temperature and salt resistance.

Description

technical field [0001] The invention relates to the technical field of oil field enhanced oil recovery, in particular to a nano silicon dioxide / polymer oil displacement agent and a synthesis method thereof. Background technique [0002] The linear polymers (polyacrylamide and partially hydrolyzed polyacrylamide) widely used in polymer flooding, after being sheared, the molecular chain of the polymer will be destroyed, so that the viscosity of the polymer and the The adsorption and retention capacity is reduced, which leads to a decrease in the mobility control ability of the polymer. In order to overcome the above-mentioned problems of linear polymers, more and more attention has been paid to nonlinear polymers. These polymers mainly include star polymers, branched polymers, and dendrimers. In addition, adding some suitable nano-materials to the polymer, such as nano-silicon dioxide, titanium oxide, zinc oxide, etc., can significantly improve the viscosity retention rate of...

Claims

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Application Information

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IPC IPC(8): C09K8/588C08F292/00C08F220/56C08F220/06
Inventor 赖南君李玺彭琴覃孝平叶仲斌
Owner SOUTHWEST PETROLEUM UNIV
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