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Temperature-sensitive modified silica nanosphere and preparation method and application thereof

A technology of silica and nano-microspheres, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of complex product composition and low grafting efficiency, achieve good water dispersibility, simple preparation process, The effect of mild reaction conditions

Active Publication Date: 2013-07-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The grafting efficiency of this method is low, and the product composition is complex

Method used

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  • Temperature-sensitive modified silica nanosphere and preparation method and application thereof

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Embodiment 1

[0043] This embodiment provides a temperature-sensitive modified silica nano-microspheres, the preparation method of which comprises the following steps:

[0044] At room temperature, dissolve 9 mL of tetraethyl orthosilicate in 100 mL of absolute ethanol, then slowly add 10 mL of concentrated ammonia water into the mixed solution of tetraethyl orthosilicate and absolute ethanol, and then stir the reaction at 300 rpm 9h, and during the reaction process, ultrasonically disperse for 10min every 1h to obtain a suspension of silica nanospheres;

[0045] Under stirring at 300rpm, 4mL of γ-(methacryloxy)propyltrimethoxysilane was added to the silica nanosphere suspension, and then reacted at 60±2°C for 16h to obtain a coupling agent Modified silica nanosphere suspension;

[0046] Under stirring at a speed of 300 rpm, 1 g of thermosensitive polymer monomer N-isopropylacrylamide, cross-linking agent N, N'-methylene Base bisacrylamide 0.02g, initiator azobisisobutyronitrile 0.01g, ca...

Embodiment 2

[0049] This embodiment provides a temperature-sensitive modified silica nano-microspheres, the preparation method of which comprises the following steps:

[0050] At room temperature, dissolve 6 mL of methyl orthosilicate in 100 mL of 95% ethanol, then slowly add 4 mL of tetramethylammonium hydroxide to the mixed solution of methyl orthosilicate and 95% ethanol, then stir at 500 rpm React for 24 hours, and during the reaction process, ultrasonically disperse for 10 minutes every 3 hours to obtain a suspension of silica nanospheres;

[0051] Under stirring at 500 rpm, 6 mL of vinyltriethoxysilane was added to the silica nanosphere suspension, and then reacted at 70±2°C for 4 hours to obtain a coupling agent-modified silica nanosphere microsphere suspension;

[0052] Under stirring at a speed of 500 rpm, 2 g of allyl polyether, a monomer of temperature-sensitive modified polymer, and 0.04 g of butyl methacrylate as a cross-linking agent were added to the suspension of silica na...

Embodiment 3

[0055] This embodiment provides a temperature-sensitive modified silica nano-microspheres, the preparation method of which comprises the following steps:

[0056] At room temperature, dissolve 3mL of butyl orthosilicate in 100mL of ethylene glycol, then slowly add 2mL of ethylenediamine into the mixed solution of butyl orthosilicate and ethylene glycol, and then stir the reaction at 300rpm 15h, and during the reaction process, ultrasonically disperse for 10min every 5h to obtain a suspension of silica nanospheres;

[0057] Under stirring at 300 rpm, 2 mL of vinyltrimethoxysilane was added to the silica nanosphere suspension, and then reacted at 100±2°C for 12 hours to obtain a coupling agent-modified silica nanosphere ball suspension;

[0058] Under stirring at a rotating speed of 300 rpm, 2.5 g of thermosensitive polymerizable monomer vinylpyrrolidone and 0.05 g of diallyl phthalate are added to the suspension of silica nano-microspheres modified by the coupling agent to tri...

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Abstract

The invention provides a temperature-sensitive modified silica nanosphere and a preparation method and application thereof. The preparation method comprises the steps of: adding an alkali liquor into a mixture of a precursor and a solvent for reacting to get a silica nanosphere suspension, adding a silane coupling agent to a silica nanosphere suspension for reacting to get a crosslinking agent-modified silica nanosphere suspension; adding a temperature-sensitive polymer monomer, a crosslinking agent and an initiator to the crosslinking agent-modified silica nanosphere suspension for a polymerization reaction to get a temperature-sensitive modified silica nanosphere crude product; and cooling, filtering, washing and drying the temperature-sensitive modified silica nanosphere crude product to obtain temperature-sensitive modified silica nanospheres. The method adopts an in-situ one-step method, so that the resulting temperature-sensitive modified silica nanospheres have special surface properties and rheological properties. The present invention also provides the temperature-sensitive modified silica nanospheres by the method and application thereof in enhancing oil recovery.

Description

technical field [0001] The invention relates to a temperature-sensitive modified silicon dioxide nano-microsphere and its preparation method and application, in particular to a method for preparing a temperature-sensitive modified silicon dioxide nano-microsphere in one step in situ, which belongs to oil field enhanced oil recovery technology field. Background technique [0002] At present, my country's economy is developing rapidly, the demand for energy is increasing sharply, the dependence on foreign crude oil is soaring rapidly, and the international oil price is fluctuating at a high level. As an irreplaceable basic energy source, oil plays an increasingly important role in the national economy. [0003] my country's old oilfields have entered the "double ultra-high" stage of ultra-high water cut and high recovery degree. Taking Daqing Lasaxing Main Oilfield as an example, the recovery rate has exceeded 50%, and the recovery rate of recoverable reserves has exceeded 80%...

Claims

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Application Information

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IPC IPC(8): C08F292/00C09K8/584
Inventor 罗健辉杜志平雷群武江红台秀梅王平美丁彬朱怀江白凤鸾
Owner PETROCHINA CO LTD
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