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Nano oil displacement and profile control agent as well as preparation method and application thereof

A technology of regulating and displacing agents and nanometers, which is applied in the field of nanomaterials, can solve the problems of fragile microspheres, complex post-production treatment, large original particle size of microspheres, etc., and achieve the effect of improving oil recovery

Pending Publication Date: 2021-11-12
NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process requires too much organic solvent, the post-production treatment is complicated, not environmentally friendly, and the cost is high, so it is not suitable for large-scale promotion and use
The original particle size of the prepared microspheres is relatively large, so it is not suitable for injection into low-permeability reservoirs with permeability less than 100mD
And under the condition of high temperature salinity, the stability is poor, and the microspheres are easy to break under a certain shear force and cannot play the role of plugging

Method used

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  • Nano oil displacement and profile control agent as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0056] Preparation of core-shell nanomaterials, the steps are as follows:

[0057] Step (1) Weigh 75g of deionized water, then add 5g of Tween 80 and heat and stir until dissolved.

[0058] Step (2) Weigh 7 g of styrene and 3 g of stearyl acrylate and add them to the solution in step (1) and heat and stir at a stirring speed of 500 rpm, a temperature of 50° C., and a stirring time of 30 min to form a stable oil-in-water emulsion. Then add 0.01 g of N-N methylenebisacrylamide and stir to dissolve.

[0059] Step (3) Put the emulsion obtained in step (2) into a three-necked flask, place it in an oil bath and install a stirrer, pass nitrogen gas to exhaust oxygen for 30 minutes, then raise the temperature to 70°C, and stir at a speed of 250rpm.

[0060] Step (4) Weigh 0.05g of potassium persulfate, dissolve it with 10g of deionized water, pass nitrogen gas to exhaust oxygen for 15min, after the oxygen exhaust is completed, wait for the temperature of the solution in the flask in ...

Embodiment 2

[0065] Preparation of core-shell nanomaterials, the steps are as follows:

[0066] Step (1) Weigh 70g of deionized water, then add 10g of emulsifier and heat and stir until the emulsifier dissolves.

[0067] Step (2) Weigh 9 g of methyl styrene and 1 g of octadecyl acrylate and add to the solution of step (1) and heat and stir at a stirring speed of 300 rpm, a temperature of 25° C., and a stirring time of 60 min to form a stable oil-in-water emulsion. Then add 0.05 g of methylene acrylamide and stir to dissolve.

[0068] Step (3) Put the emulsion obtained in step (2) into a three-necked flask, place it in an oil bath, install a stirrer, pass nitrogen gas to exhaust oxygen for 20 minutes, then raise the temperature to 80°C, and the stirring speed is 300rpm.

[0069] Step (4) Weigh 0.1g of potassium persulfate, dissolve it in 10g of deionized water, pass nitrogen gas to exhaust oxygen for 20min, after the oxygen exhaust is completed, add it after the temperature of the solution...

Embodiment 3

[0074] Preparation of core-shell nanomaterials, the steps are as follows:

[0075] Step (1) Weigh 65g of deionized water, then add 10g of emulsifier and heat and stir until the emulsifier dissolves.

[0076] Step (2) Weigh 7.5 g of styrene-propylene and 7.5 g of octadecyl acrylate into the solution of step (1) and heat and stir at a stirring speed of 600 rpm, a temperature of 60° C., and a stirring time of 20 min to form a stable oil-in-water emulsion. Then add 0.075g of N-N methylenebisacrylamide and stir to dissolve.

[0077] Step (3) Put the emulsion obtained in step (2) into a three-necked flask, place it in an oil bath and install a stirrer, pass nitrogen gas to exhaust oxygen for 30 minutes, then raise the temperature to 70°C, and stir at a speed of 250rpm.

[0078] Step (4) Weigh 0.015g of potassium persulfate, dissolve it with 10g of deionized water, pass nitrogen gas to exhaust oxygen for 10min, after the oxygen exhaust is completed, add it after the temperature of t...

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Abstract

The invention discloses a nano oil displacement and profile control agent agent, which is characterized in that the nano oil displacement and profile control agent agent comprises a core-shell nano material and a surfactant; the core-shell nano material comprises an oil-soluble core which is obtained by reaction of materials containing an olefine acid ester compound, a styrene compound, an emulsifier, a cross-linking agent and an initiator; and the oil-soluble core is coated with a shell obtained through a polymerization reaction of a water-soluble monomer. According to the invention, an oil-soluble core is firstly synthesized through emulsion polymerization, then a water-soluble monomer is added, and the core-shell nano material is prepared through polymerization reaction. The particle size and the thickness of the core-shell material can be controllably adjusted by regulating and controlling the type, the proportion and the concentration of the shell monomers, the concentration of the core and the reaction time. The core release time is adjusted by regulating and controlling the temperature, the mineralization degree and the shearing force, and deep oil displacement and profile control agent is achieved.

Description

technical field [0001] The application relates to a nanometer displacement agent and its preparation method and application, belonging to the technical field of nanomaterials. Background technique [0002] With the deepening of low-permeability exploration and development, the proportion of old oil areas has increased year by year, and the problem of water channeling and flooding has become an urgent task to be solved in water flooding development of low-permeability old oil areas. Profile control is the main method adopted at home and abroad to control the problem of water channeling and flooding. Low-permeability reservoirs are characterized by fine pores, low permeability, poor physical properties, strong heterogeneity, and low productivity. [0003] For heterogeneous formations, water injection well profile control and production well water plugging technology are generally used, but the effective range of this technology is limited to the near wellbore area, and cannot...

Claims

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Application Information

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IPC IPC(8): C08F257/02C08F220/56C08F220/58C08F228/02C08F212/08C08F220/18C08F222/38C08F212/12B82Y40/00C09K8/508C09K8/516C09K8/584C09K8/588
CPCC08F257/02C08F212/08C08F212/12B82Y40/00C09K8/588C09K8/584C09K8/5083C09K8/516C08F220/1818C08F222/385C08F220/56C08F220/585C08F228/02
Inventor 刘艳华邓青春吴向阳方叶青俞波田玉芹王耀国
Owner NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST CO LTD