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Magnetic composite gel microspheres and preparation method thereof

A composite gel and composite microsphere technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of reduced water absorption, unstable structure, loss of blocking and regulating effect, etc., and achieves simple steps and easy implementation. Effect

Inactive Publication Date: 2017-05-31
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, current polymer gel microsphere profile control agents are usually polymerized from acrylamide, acrylic acid, cationic associative monomers and sulfonic acid monomers, and these polymer gel microsphere profile control agents are generally The structure is unstable. When used above 70°C, the gel microspheres will degrade, reduce water absorption, and eventually lose the blocking effect

Method used

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  • Magnetic composite gel microspheres and preparation method thereof
  • Magnetic composite gel microspheres and preparation method thereof
  • Magnetic composite gel microspheres and preparation method thereof

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preparation example Construction

[0049] The present invention provides a method for preparing magnetic composite gel microspheres described in the above scheme, comprising the following steps:

[0050] (1) the modified nano-Fe 3 o 4 Dispersed in organic solvents to obtain modified nano-Fe 3 o 4 the dispersion liquid;

[0051] (2) the modified nano-Fe 3 o 4 The dispersion liquid and the emulsifier are mixed and emulsified to obtain the modified nano-Fe 3 o 4 Lotion;

[0052] (3) the modified nano-Fe 3 o 4 Emulsion and acrylic acid and polyacrylamide carry out the first crosslinking reaction under the condition of sodium hydroxide, crosslinking agent and initiator, obtain acrylic acid-acrylamide copolymer / Fe 3 o 4 Composite microspheres;

[0053] (4) the acrylic acid-acrylamide copolymer / Fe 3 o 4 Composite microspheres dispersed in organic solvents to obtain acrylic acid-acrylamide copolymer / Fe 3 o 4 Composite gel microsphere dispersion;

[0054] (5) the acrylic acid-acrylamide copolymer / Fe 3 ...

Embodiment 1

[0078] a) Preparation of nano ferric oxide: under a nitrogen atmosphere, add iron oxide and ferrous oxide to a three-necked flask equipped with deionized water at 50°C to control Fe 3+ :Fe 2+ =3:2, after mechanically stirring and dissolving evenly, add 25% ammonia water dropwise according to the speed of 5 seconds / drop to adjust the pH value to 11; stir and react for 4h, use magnetic tilting method (add acetone or ethanol to the beaker, Put a magnet on its bottom, pour out the upper layer solution after it is flocculated) and treat it twice, and dry the processed product in a vacuum oven at 60°C for 24 hours to obtain nano-ferric oxide;

[0079] b) Preparation of γ-methacryloxypropyltrimethoxysilane (KH-570) modified nano-ferric oxide powder: add 3 g of nano-ferric oxide prepared in step a) to a three-necked flask and 100ml of ethanol, ultrasonically disperse for 15min; then add 1ml of ammonia water to the dispersion, move the three-necked flask into a water bath at 30°C for ...

Embodiment 2

[0086] a) according to the method of embodiment 1 step a), prepare nano-ferric oxide powder;

[0087] B) the coupling agent is replaced by KH-560, according to the method of embodiment 1 step b) to prepare KH-560 modified nano ferric oxide powder;

[0088] c) Preparation of acrylic acid-acrylamide copolymer (P(AA-AM)) / Fe 3 o 4 Composite gel microspheres: Add 1.07g of the modified iron ferric oxide prepared in step b) to 30mL of liquid paraffin, and disperse by ultrasonic for 15min to obtain a uniform dispersion, then pour the resulting dispersion into a three-necked flask , moved into a 55°C water bath for mechanical stirring, then added 0.31g of emulsifier Tween 60 (emulsifier T-60), 0.93g of Span 60 (emulsifier S-60), and then took 10ml of liquid paraffin into a three-necked flask , stirred rapidly at a speed of 400r / min for 10min, then added 4.52g of AA, 3.48g of AM, 0.08g of cross-linking agent N,N-methylenebisacrylamide (MBA), 1.63g of NaOH, Adjust the rotation speed t...

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Abstract

The invention provides magnetic composite gel microspheres. The magnetic composite gel microspheres comprise modified nanometer Fe3O4 microspheres and polymers cross-linked on the surfaces of the modified nanometer Fe3O4 microspheres, wherein the polymers comprise polyacrylonitrile and acrylic-acrylamide copolymers; and the modified nanometer Fe3O4 microspheres are silane coupler modified nanometer Fe3O4 microspheres. The magnetic composite gel microspheres provided by the invention concurrently have high-blocking intensity of inorganic components and water absorption expanding, migration and deformability of organic components, have favorable application potential, have super paramagnetism, can realize magnetic separation when breaking through oil layers to discharge along with produced liquid, and are suitable for magnetic water plugging in oil wells. Tests prove that the water absorption rate of the magnetic composite gel microspheres provided by the invention under the condition of 70 DEG C is more than 90g / g, and the water absorption rate of the magnetic composite gel microspheres at low temperature is relatively low, so that the phenomenon that the magnetic composite gel microspheres absorb water to be expanded before being pumped into shafts is avoided, and the construction properties of the magnetic composite gel microspheres are good.

Description

technical field [0001] The invention relates to the technical field of profile control construction in an oil recovery process in an oil field, in particular to a magnetic composite gel microsphere and a preparation method thereof. Background technique [0002] At present, most oilfields in my country have entered into a period of high water cut development, and water production from oil layers will eventually reduce the recovery rate of oilfields. The most commonly used method is to determine the water-producing layer after the oil well produces water, and then use the water plugging method to plug, control the flow of water in the water-producing layer and change the flow direction of water in the water-flooding oil by plugging, and improve the efficiency of water-flooding oil , so that the water production of the oilfield will decrease or stabilize for a period of time, so as to maintain the increase or stability of the oilfield production and improve the ultimate recover...

Claims

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Application Information

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IPC IPC(8): C08F285/00C08F220/48C08F222/38C08F292/00C08F220/06C08F220/56C08F222/20C09K8/512
CPCC08F285/00C08F292/00C09K8/512C09K8/845C09K8/887C08F220/48C08F220/06
Inventor 张定军白雪陈玉娴李永通甘明洋马应霞王海燕
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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