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Nano-water soluble microgel oil displacing material and its preparation method

A microgel flooding, water-soluble technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high viscosity of the system, inability to enter deep formations, etc., achieve good dispersibility, and is conducive to the size of micropores The control of the particle size is beneficial to the effect of particle size control

Active Publication Date: 2007-01-31
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high viscosity of the system, it cannot penetrate deep into the formation, so it can only be used for near-well profile control or water plugging.
(C) Pre-crosslinking polymerization, that is, the monomer / crosslinking agent is crosslinked and polymerized under suitable polymerization conditions to form a microgel of a certain size, for example, a nanometer-sized crosslinked polymer can be obtained by reverse-phase microemulsion polymerization, This reaction method has the advantages of simple preparation and adjustable particle size, but how to adapt to the needs of deep reservoir control and flooding needs to be further improved in the design and synthesis of suitable microgel systems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Dissolve acrylamide accounting for 20% of the reaction system into deionized water accounting for 15% of the reaction system, stir to dissolve it, add sodium acrylate accounting for 5% of the reaction system, and then add 1.5% of the reaction system N- After vinylpyrrolidone is completely dissolved, add N, N-methylenebisacrylamide accounting for 1% of the total mass of the reaction monomers, stir fully until the solution is clear and free of solid insolubles, and adjust the solution to pH=7.

[0049] (2) Dissolving the surfactant (18% Span-80, 10% Tween-60) accounting for 28% of the reaction system into the white oil accounting for 30% of the reaction system, after fully dissolving evenly, the step The monomer aqueous solution of (1) is added step by step and fully stirred to obtain a transparent or translucent inverse microemulsion polymerization reaction system.

[0050] (3) After dissolving azobisisobutyronitrile accounting for 1% of the total mass of the reacti...

Embodiment 2

[0053] (1) Dissolve acrylamide accounting for 24% of the reaction system into deionized water accounting for 17.5% of the reaction system, stir to dissolve it, and then add 2-acrylamido-2-methylpropanesulfonic acid accounting for 5% of the reaction system Sodium, then add N-vinylpyrrolidone accounting for 3% of the reaction system, after it is completely dissolved, then add diallyldimethylammonium chloride accounting for 3% of the total mass of the reaction monomers, and fully stir until the solution is clear and free of solids For insoluble matter, the solution was adjusted to pH=7 with 1% NaOH aqueous solution.

[0054] (2) dissolve the surfactant (16% Span-85, 9% Tween-65) accounting for 25% of the reaction system into the solvent 1 (20% white oil, 5% Diesel oil), after fully dissolving evenly, gradually add the aqueous monomer solution in step (1) and stir fully to obtain a transparent or translucent inverse microemulsion polymerization reaction system.

[0055] (3) 2-met...

Embodiment 3

[0058] (1) Dissolve acrylamide accounting for 15% of the reaction system into deionized water accounting for 15% of the reaction system, stir to dissolve it, add sodium methacrylate accounting for 10% of the reaction system, and then add 6% of the reaction system After N-hydroxyethylacrylamide is completely dissolved, add polyethylene glycol diacrylate accounting for 5% of the total mass of the reaction monomers, stir fully until the solution is clear and free of solid insolubles, and adjust the solution with 1% NaOH aqueous solution to pH=7.

[0059] (2) dissolve the surfactant (20% Span-40, 10% Tween 81) accounting for 30% of the reaction system into the kerosene accounting for 24% of the reaction system, after fully dissolving, the step (1 ) monomer aqueous solution is added step by step, fully stirred, and a transparent or translucent inverse microemulsion polymerization reaction system can be obtained.

[0060] (3) 2-hydroxyl-2-methyl-1-phenylacetone (D-1173), which acco...

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Abstract

The present invention belongs to the field of water-soluble functional high-molecular nano material, in particular, it relates to a nano water-soluble microgel oil displacement material and method for preparing said nano water-soluble microgel oil displacement material by adopting inverse microemulsion ligh-polymerization process. It is characterized by that said invention utilizes acrylamide / anionic monomer / third monomer to synthesize ternary copolymer nano-size microgel oil displacement material. Besides, said invention also provides the concrete steps of its preparation method.

Description

technical field [0001] The invention belongs to the field of water-soluble functional macromolecule nanomaterials, in particular to a nanometer water-soluble microgel oil displacement material and a method for preparing the nanometer water-soluble microgel oil displacement material by using an inverse microemulsion photopolymerization method. Background technique [0002] Polymer flooding has become an important technology to enhance oil recovery in today's oilfields. However, for heterogeneous formations, displacement can only act on high-permeability layers, and does not reach oil-bearing low-permeability layers, which results in poor oil recovery. Lower rates, higher costs. Generally, injection well profile control and production well water plugging technology are often used for heterogeneous formations, but the effective range of this technology is limited to the near-wellbore zone, and cannot go deep into the oil well, so it cannot achieve the purpose of greatly improvi...

Claims

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Application Information

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IPC IPC(8): C09K8/588
Inventor 吴飞鹏施盟泉张云龙张玉玺何勇
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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