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Nanometer and micron water-soluble microgel reservoir oil material and preparation method thereof

A microgel flooding, water-soluble technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve problems such as inability to enter deep formations, small gel particle size, and loss of plugging effect, etc. It is beneficial to the control of particle size, small impact and stable effect

Active Publication Date: 2007-03-14
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.
Moreover, due to formation shear, the size of gel particles will become smaller and smaller, and finally lose the plugging effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Preparation of monomer solution

[0052] Dissolve acrylamide accounting for 27% of the reaction system into deionized water accounting for 28% of the reaction system, stir to dissolve it, add 0.5% of the reaction system sodium acrylate, and then add 0.1% of the reaction system N-vinylpyrrolidone , after completely dissolving, add N, N-methylenebisacrylamide accounting for 0.01% of the total mass of the reaction monomers, stir well until the solution is clear and free of solid insolubles, and adjust the solution to pH = 7 with 1% NaOH aqueous solution .

[0053] (2) Preparation of inverse emulsion system

[0054] Dissolve the surfactant (Span-80: 6%, Tween-60: 3%) accounting for 9% of the reaction system into the diesel oil accounting for 35% of the reaction system, and after being fully dispersed and dissolved, the step (1) Slowly add the aqueous monomer solution and stir well to obtain an opaque inverse emulsion polymerization reaction system.

[0055] (3) therm...

Embodiment 2

[0058] (1) Preparation of monomer solution

[0059] Dissolve acrylamide accounting for 20% of the reaction system into deionized water accounting for 30% of the reaction system, stir to dissolve it, add 2-acrylamido-2-methylpropanesulfonate sodium accounting for 1% of the reaction system, and then Add 0.5% of N-hydroxyethylacrylamide to the reaction system, and after it is completely dissolved, add 0.1% of diallyldimethylammonium chloride to the total mass of the reaction monomers, and stir well until the solution is clear and there is no solid insoluble The solution was adjusted to pH=7 with 1% NaOH aqueous solution.

[0060] (2) Preparation of inverse emulsion system

[0061] Dissolve the surfactant (Span-85: 6%, EL-40: 5%) accounting for 11% of the reaction system into the mixed solvent of diesel oil and 17% white oil accounting for 20% of the reaction system, and wait until it is fully dispersed and dissolved Finally, slowly add the aqueous monomer solution in step (1) a...

Embodiment 3

[0065] (1) Preparation of monomer solution

[0066] Dissolve acrylamide accounting for 25% of the reaction system into deionized water accounting for 26% of the reaction system, stir to dissolve it, add sodium allyl sulfonate accounting for 5% of the reaction system, and then add β -Aminoethyl acrylate, after it is completely dissolved, add polyethylene glycol diacrylate 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 with 1% NaOH aqueous solution to pH=7.

[0067] (2) Preparation of inverse emulsion system

[0068] Dissolve the surfactant (Span-60: 7%, cetyltrimethylammonium bromide (CTAB): 3.7%) accounting for 10.7% of the reaction system into the kerosene accounting for 30% of the reaction system, and wait until fully dispersed After uniform dissolution, slowly add the monomer aqueous solution in step (1) and stir thoroughly to obtain an opaque inverse emulsion polym...

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Abstract

The present invention relates to nanometer and micron polymer material, and is especially one kind of nanometer and micron water soluble microgel oil-displacing material with wide size range and its reverse emulsion polymerizing preparation process. In the reverse emulsion polymerization process, water soluble monomer and cross-linking agent react to form pre-crosslinked spheroid water soluble microgel polymer with certain elasticity. As one kind of oil-displacing material, the nanometer and micron water soluble microgel material is opaque reverse emulsion, and has excellent flowability and stability, viscosity at 25 deg.c lower than 400 mPa.s, no obvious delamination. When the material and water soluble surfactant are injected simultaneously into water, the material will disperse fast and swelled to form microgel grains of 100 nm to 20 micron size.

Description

technical field [0001] The invention belongs to the field of water-soluble functional polymer nano-micron materials, in particular to a water-soluble microgel flooding material with a wide size range of nanometer and micron, and a stable nano-micron wide-size range water-soluble microgel flooding material prepared by inverse emulsion thermal polymerization. method of oil material. Background technique [0002] As a new type of material that can effectively improve oil recovery, water-soluble polymer microgel profile control and water shutoff agent has been applied in most oilfields in my country in recent years. At present, there are three main methods for the preparation of this particulate water-soluble cross-linked polymer material: (1) online cross-linking polymerization, that is, the dilute polymer / cross-linking agent solution undergoes internal cross-linking on-site in the injected formation to form microcoagulation glue. e.g. partially hydrolyzed polyacrylamide (HPA...

Claims

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Application Information

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IPC IPC(8): C08F20/56C08F2/26E21B43/22
Inventor 施盟泉吴飞鹏张云龙
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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