High-temperature high-salinity oil reservoir polymer microsphere dispersed system modifying and flooding agent, and preparation method and application thereof

A dispersion system, high temperature and high salt technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of dispersion polymerization that has not been disclosed, and achieve the effect of improving oil recovery

Active Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Throughout the above studies, there are only a few reports on the use of alcohol / water as the dispersion system, or the introduction of hydrophobic monomers but the use of organic solvents as dispersants to prepare acrylamide polymer microsphere dispersion systems, but those containing hydrophobic monomers Alcohol-water system dispersion polymerization that can meet the requirements of high-salinity reservoirs has not been published, and there is no research report on the application of such microspheres to profile control and water shutoff in oilfields

Method used

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  • High-temperature high-salinity oil reservoir polymer microsphere dispersed system modifying and flooding agent, and preparation method and application thereof
  • High-temperature high-salinity oil reservoir polymer microsphere dispersed system modifying and flooding agent, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] First add 1000g of deionized water, 2.5g of methylenebisacrylamide (MBA), 0.3g of disodium ethylenediaminetetraacetic acid (EDTA), 2-acrylamido-2-methylpropanesulfonic acid (AMPS) into the container ) 125g, acrylamide (AM) 375g, sodium 2-acrylamidotetradecylsulfonate 5g, stir until completely mixed, neutralize with AMPS equimolar sodium hydroxide (NaOH) and adjust the pH to 7. Add 1,300 g of tert-butanol (TBA) and 250 g of polyethylene glycol (PEG) with a molecular weight of 20,000 and stir until completely mixed. Put this solution into the reaction kettle, and pass nitrogen gas for 30min. Turn on the stirring at 15°C, keep the rotation speed at 300rpm, and drop in 1.25% ammonium persulfate (APS) aqueous solution, 0.75% sodium bisulfite (MBS) aqueous solution and 2.5% 2,2'-even Nitrogen[2-(2-imidazolin-2-yl)propane] dihydrochloride (AIBA) aqueous solution 10g, and keep continuing nitrogen and stirring, stop nitrogen after 30min, raise the temperature to 30°C for 1h, I...

Embodiment 2

[0050] First add 1000g of deionized water, 2.2g of pentaerythritol triacrylate, 0.22g of disodium ethylenediamine tetraacetate (EDTA), 90g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), acryloyl Oxyethyltrimethylammonium chloride 30g, acrylamide (AM) 330g, octyl acrylate 4g, stir until completely mixed, neutralize with AMPS equimolar sodium hydroxide (NaOH) and adjust the pH to 6.5 , then add 775g of tert-butanol (TBA) and 25g of polyvinylpyrrolidone (PVP) of K30 and stir until completely mixed. Put this solution into the reaction kettle, and pass nitrogen gas for 30min. Turn on the stirring at 15°C, keep the rotation speed at 280rpm, and drop in 5.5% ammonium persulfate (APS) aqueous solution, 3.3% sodium bisulfite (MBS) aqueous solution and 11% 2,2'-even Nitrogen[2-(2-imidazolin-2-yl)propane] dihydrochloride (AIBA) aqueous solution 10g, and keep continuing nitrogen and stirring, stop nitrogen after 30min, raise the temperature to 30°C for 1h, It was then raised to 45...

Embodiment 3

[0053] First add 880g of deionized water, 3.2g of divinylbenzene, 0.28g of disodium ethylenediaminetetraacetic acid (EDTA), 80g of methacryloyloxyethyltrimethylammonium chloride, acrylamide (AM ) 480g, tert-butyl styrene 6g, stir until completely mixed evenly, neutralize with AMPS equimolar sodium hydroxide (NaOH) and adjust the pH to 5.5, then add tert-butanol (TBA) 1590g and the grade is 17-88 polyvinyl alcohol (PVA) 25g and stir until completely mixed. Put this solution into the reaction kettle, and pass nitrogen gas for 30min. Stirring is started at 30°C, the rotating speed is kept at 280rpm, 10 g of azobisisobutyronitrile (AIBN) ethanol solution with a concentration of 4% is added dropwise, and the nitrogen flow and stirring are continued, and the nitrogen flow is stopped after 30 minutes, and the temperature is raised to Raise to 55°C and keep for 3 hours, during which time it can be seen that the reaction solution gradually changes from transparent to translucent until...

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Abstract

The invention relates to a high-temperature high-salinity oil reservoir polymer microsphere dispersed system modifying and flooding agent, and a preparation method and an application thereof. In prior arts, polymer microsphere system prepared with an inverse emulsion method has low compounding performance with a flooding surfactant, such that chromatographic separation might occur after long-term aging, and flooding efficiency is reduced. The high-temperature high-salinity oil reservoir polymer microsphere dispersed system modifying and flooding agent provided by the invention comprises the following components, by weight: 0.3-3 parts of a polymer microsphere dispersed system, 0.5-5 parts of a flooding surfactant, and 92-99.2 parts of water. The dispersed system is polymer microsphere with an submicron-grade to micron-grade initial particle size and with monodispersity, prepared with an alcohol-water system dispersion polymerization method. According to the invention, the above problem is well solved. The high-temperature high-salinity oil reservoir polymer microsphere dispersed system modifying and flooding agent can be applied in on-site high-temperature high-salt-infiltration oil reservoir tertiary oil recovery deep profile control, water plugging and flooding applications for improving recovery rate.

Description

technical field [0001] The invention relates to a high-temperature high-salt oil reservoir polymer microsphere dispersion system flood control agent and a preparation method thereof. Background technique [0002] Polyacrylamide microspheres are polyacrylamide spherical particles containing cross-linking agents, which can be prepared by homogeneous and heterogeneous methods. The former mainly includes inverse emulsion polymerization and inverse microemulsion polymerization, and the product is generally latex or microlatex; the latter includes dispersion polymerization, precipitation polymerization, inverse suspension polymerization, etc., and the product is generally solid particles. Due to different polymerization methods, the particle size of the reaction product is also different. [0003] After primary and secondary oil recovery in major domestic oil fields, the water content of crude oil continues to increase, and some large oil fields have entered the stage of tertiary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C09K8/584C09K8/508
Inventor 夏燕敏于志省蔡红李晓东
Owner CHINA PETROLEUM & CHEM CORP
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