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Preparation method and application of intelligent controlled-release targeting nanometer oil-displacing agent microcapsule

An intelligent controlled-release and oil-displacing agent technology, applied in the direction of microsphere preparation, chemical instruments and methods, microcapsule preparations, etc., can solve the problems of salt and high temperature resistance, strong heterogeneity of oil layers, loss, etc., to achieve Reduce the effect of agglomeration

Inactive Publication Date: 2021-03-23
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nano oil displacement agent is not resistant to salt and high temperature in the reservoir, and the loss is serious during the migration from the wellhead to the underground, and the loss is mainly in the area where the remaining oil is relatively small; in addition, the nano oil displacement agent has a high specific surface area. It is easy to agglomerate into large particles, which affects the oil displacement efficiency; in addition, about 70% of the oilfields in my country are low-permeability oilfields, the reservoir physical properties are poor, and the oil layer is highly heterogeneous, resulting in uneven distribution of remaining oil, which seriously affects displacement Effect

Method used

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  • Preparation method and application of intelligent controlled-release targeting nanometer oil-displacing agent microcapsule
  • Preparation method and application of intelligent controlled-release targeting nanometer oil-displacing agent microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Core material treatment: use silica spherical particles uniformly dispersed between 15nm and 30nm in particle size as a template, and use solid paraffin fixation method to embed nano-silica particles into the emulsion interface of solid paraffin / water two phases , and then use 5 parts of coupling agent to modify the surface of nano-silica particles to prepare modified nano-silica particles, rinse and dry.

[0032] (2) Configure the intermediate water phase: add 30 parts of acrylamide (AM) monomer and 5 parts of environment-responsive nanoparticles to 100 parts of distilled water, stir well to dissolve, and obtain the intermediate water phase.

[0033] (3) Preparation of magnetic nanoparticles: the nanomaterial FeSO 4 ·7H 2 O with NaOH, trisodium citrate and NaNO 3 Dissolve in deionized water, stir magnetically at 80°C until dissolved, cool to room temperature, separate, wash, and dry to obtain nanometer-scale ferric oxide.

[0034] (4) Configure the oil phase: ad...

Embodiment 2

[0038] (1) Core material treatment: use silica spherical particles uniformly dispersed between 15nm and 30nm in particle size as a template, and use solid paraffin fixation method to embed nano-silica particles into the emulsion interface of solid paraffin / water two phases , and then use 5 parts of coupling agent to modify the surface of nano-silica particles to prepare modified nano-silica particles, rinse and dry.

[0039] (2) Configure the intermediate water phase: add 35 parts of N-isopropylacrylamide (NIPAM) monomer and 5 parts of environment-responsive nanoparticles to 100 parts of distilled water, stir well to dissolve, and obtain the intermediate water phase.

[0040] (3) Preparation of magnetic nanoparticles: the nanomaterial FeSO 4 ·7H 2 O with NaOH, trisodium citrate and NaNO 3 Dissolve in deionized water, stir magnetically at 80°C until dissolved, cool to room temperature, separate, wash, and dry to obtain nanometer-scale ferric oxide.

[0041] (4) Configure the...

Embodiment 3

[0045] (1) Core material treatment: use silica spherical particles uniformly dispersed between 15nm and 30nm in particle size as a template, and use solid paraffin fixation method to embed nano-silica particles into the emulsion interface of solid paraffin / water two phases , and then use 5 parts of coupling agent to modify the surface of nano-silica particles to prepare modified nano-silica particles, rinse and dry.

[0046] (2) Configure the intermediate water phase: add 40 parts of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) monomer and 5 parts of environment-responsive nanoparticles to 100 parts of distilled water, stir well to dissolve them, and obtain the intermediate water box.

[0047] (3) Preparation of magnetic nanoparticles: the nanomaterial FeSO 4 ·7H 2 O with NaOH, trisodium citrate and NaNO 3 Dissolve in deionized water, stir magnetically at 80°C until dissolved, cool to room temperature, separate, wash, and dry to obtain nanometer-scale ferric oxide.

[...

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Abstract

The invention provides a preparation method and application of an intelligent controlled-release targeting a nanometer oil-displacing agent microcapsule. The preparation method comprises the followingsteps: embedding magnetic nanoparticles in the capsule wall of a polymer microcapsule, and conducting targeting positioning on a nanometer oil-displacing agent by using an external magnetic field; and realizing controlled-release of the nanometer oil-displacing agent through the extension-contraction characteristic of a specific polymer grafted chain in a membrane hole, wherein when oil saturation is very low and a water content is very high, a macromolecular chain in a membrane is in an extension state, so the membrane hole is closed, and the release of the nanometer oil-displacing agent inthe microcapsule is limited; when the oil saturation is increased, the macromolecular chain in the membrane is gradually changed into a shrinkage state, so membrane hole is opened; and the higher theoil saturation is, the more obvious the molecular chain shrinkage is, a release open channel for the nanometer oil displacement agent in the micro-capsule is formed, the nanometer oil displacement agent is gradually released outwards, and the purpose of targeted oil displacement is achieved.

Description

technical field [0001] The invention belongs to the field of oilfield development, and specifically relates to a preparation method and application of an intelligent controlled-release targeted nanometer oil displacement agent microcapsule, especially in improving the oil displacement efficiency of an oilfield. Background technique [0002] Petroleum is called the blood of industry and is a very important natural resource. Most oilfields in my country are in the middle and late stages of exploitation. The conventional oil recovery technology, that is, the primary oil recovery and secondary oil recovery technology that utilizes the natural energy in the reservoir and supplements energy by injecting water (gas injection) into the ground, can only make 30%~ 50% of the crude oil has been exploited, and most of the crude oil has not been effectively developed and remains in the oil reservoir in the form of residual oil. The tertiary oil recovery technology solves the main problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/56C08F220/54C08F220/58C08F2/44C08K3/22B01J13/14C09K8/588
CPCC08F292/00C08F2/44C08K3/22B01J13/14C09K8/588C08K2201/01C08K2201/011C08K2003/2275C08F220/56C08F220/54C08F220/585
Inventor 李艳段永刚魏明强陈旭盛舒遥卫诗豪李裕民伍梓健王欢王鑫岳陶谭林江
Owner SOUTHWEST PETROLEUM UNIV
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