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Profile control oil-displacement agent for core-shell type inorganic/organic polymer composite microballoon

A technology of profile control oil displacement agent and composite microspheres, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of unstable structure and large particles, and achieve low cost, good temperature and salt resistance , the effect of good structural stability

Inactive Publication Date: 2012-06-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these composite particles also have some disadvantages. For example, the particles of clay and bentonite are relatively large, and the obtained particles are generally in the millimeter scale, which is only suitable for blocking large pores; the inorganic and organic components are physically compounded, and the structure will be relatively unstable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1. Silica / polyacrylamide-acrylic acid composite microsphere profile control and oil displacement agent

[0025] Acrylamide 5%-10% (mass fraction of solvent), acrylic acid 5%-10%, N,N'-methylenebisacrylamide 0.1%-1%, azobisisobutyronitrile 0.025%-0.1%, Polyvinylpyrrolidone K300.5%-3%, 3-(methacryloyloxy)propyltrimethoxysilane modified nano-SiO 2 (10nm-600nm) 0.25%-1%, the solvent is a mixture of ethanol and ethyl acetate (the volume ratio of ethanol and ethyl acetate is 1:0-5:95), the above components are mixed, stirred and sonicated It disperses evenly, bubbling through N 2 Oxygen removal and reaction at 60°C-80°C for 2-6 hours to prepare the desired organic / inorganic composite microspheres.

Embodiment 2

[0026] Example 2. Silica / polyacrylamide-maleic anhydride composite microsphere profile control and oil displacement agent

[0027] Acrylamide 5%-10% (mass fraction of solvent), maleic anhydride 5%-10%, N,N'-methylenebisacrylamide 0.1%-1%, azobisisobutyronitrile 0.025%-0.1 %, polyvinylpyrrolidone K300.5%-3%, 3-(methacryloyloxy)propyltrimethoxysilane modified nano-SiO 2 (10nm-600nm) 0.25%-1%, the solvent is a mixture of ethanol and ethyl acetate (the volume ratio of ethanol and ethyl acetate is 1:0-5:95), the above components are mixed, stirred and sonicated It disperses evenly, bubbling through N 2 Oxygen removal and reaction at 60°C-80°C for 2-6 hours to prepare the desired inorganic / organic polymer composite microspheres.

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Abstract

The invention discloses a profile control oil-displacement agent for a core-shell type inorganic / organic polymer composite microballoon. A preparation method of the core-shell type inorganic / organic polymer composite microballoon comprises the following steps of carrying out surface modification of inorganic cores of inorganic nano-particles such as silica particles and magnetic particles, and carrying out graft polymerisation by a dispersion polymerization method or an inverse emulsion polymerization method to form polymer shells (such as polyacrylamide cross-linked copolymers) on the surfaces of the inorganic cores. The inorganic components and the organic components bind by chemical bonds so that the core-shell type inorganic / organic polymer composite microballoon has very stale structure. The core-shell type inorganic / organic polymer composite microballoon retains the advantages of polymer microballoons and inorganic particles, and has strong heat-resistant and mineralization-resistant capabilities, high plugging strength and good dilatancy. The core-shell type inorganic / organic polymer composite microballoon can move in rock pores and can plug the rock pores. When a plugging pressure difference is improved to a certain degree, elastic deformation of the core-shell type inorganic / organic polymer composite microballoon can be produced and the deformed core-shell type inorganic / organic polymer composite microballoon sequentially moves to a deep rock stratum part so that a liquid flow direction is changed gradually and a crude oil yield is improved. The profile control oil-displacement agent provided by the invention has a large potential.

Description

Technical field: [0001] The invention relates to a core-shell type inorganic / organic polymer composite microsphere profile control and oil displacement agent. Background technique: [0002] Due to the serious heterogeneity of the oil layer, in the process of water flooding and polymer flooding, the injected water and polymer solution advance unevenly along the high-permeability layer, forming a single-layer intrusion in the vertical direction and tongue intrusion in the horizontal direction, resulting in the injection of water and polymer solution. The polymer solution breaks through ahead of time, resulting in low sweep of the middle and low permeability layers and poor oil displacement effect, which seriously affects the development effect of water flooding and polymer flooding. To fundamentally solve this problem, the method of profile control and water blocking must be adopted to improve the water absorption profile and increase the water flooding sweep coefficient. [...

Claims

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Application Information

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IPC IPC(8): C09K8/588
Inventor 涂伟霞王崇刚
Owner BEIJING UNIV OF CHEM TECH
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