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Microcapsules for expansion-delayed pore-sealing materials

A technology of sealing material and microcapsules, which is applied in sealing/isolation, wellbore/well parts, earthwork drilling and production, etc. It can solve the problems of long condensation time, achieve low price, stable gas drainage, and improve expansion performance Effect

Active Publication Date: 2021-07-20
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this material is that quicklime and sodium hydroxide are alkaline substances that need to be strictly controlled in dosage, and the coagulation time is relatively long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A microcapsule for an expansion-delayed sealing material, comprising the following components by weight: 0.5-1. part of capsule core, 10 parts of capsule wall, capsule core is HCSA expansion agent, capsule wall is styrene and acrylate class of copolymers.

[0027] The capsule wall includes styrene, acrylate, dispersant and initiator, and the volume ratio of styrene: acrylate: dispersant is 1:1:4, and the mass of initiator accounts for the mass of monomer styrene and acrylate and 1%.

[0028] The acrylate is butyl acrylate; the dispersant is glycerol; the initiator is azobisisobutyronitrile.

[0029] The capsule wall was prepared by solution polymerization, the reaction temperature was 70°C, and the reaction time was 4h.

[0030] An expansion-delayed sealing material comprises the following components in parts by weight: 1 part of microcapsules, 20 parts of water, and 60 parts of Portland cement.

Embodiment 2

[0032] A microcapsule for expansion-delayed sealing material, comprising the following components by weight: 1.5 parts of capsule core, 12 parts of capsule wall, capsule core is HCSA expansion agent, capsule wall is styrene and acrylic ester copolymer .

[0033] The capsule wall includes styrene, acrylate, dispersant and initiator, and the volume ratio of styrene: acrylate: dispersant is 4:1:10, and the mass of initiator accounts for the mass of monomer styrene and acrylate and 5%.

[0034] The acrylate is methyl acrylate; the dispersant is isopropanol; the initiator is benzoyl peroxide.

[0035] The capsule wall was prepared by solution polymerization, the reaction temperature was 90°C, and the reaction time was 6h.

[0036] An expansion-delayed hole-sealing material comprises the following components in parts by weight: 12 parts of microcapsules, 30 parts of water, and 70 parts of Portland cement.

Embodiment 3

[0038] A microcapsule for an expansion-delayed sealing material, comprising the following components by weight: 1 part of capsule core, 11 parts of capsule wall, the capsule core is HCSA expansion agent, and the capsule wall is styrene and acrylic ester copolymer .

[0039] The capsule wall includes styrene, acrylate, dispersant and initiator, and the volume ratio of styrene: acrylate: dispersant is 2:1:5, and the mass of initiator accounts for the mass of monomer styrene and acrylate and 3%.

[0040] The acrylate is ethyl acrylate; the dispersant is glycerol and isopropanol at a mass ratio of 1:2; the initiator is potassium persulfate.

[0041] The capsule wall was prepared by solution polymerization, the reaction temperature was 80°C, and the reaction time was 5h.

[0042] An expansion-delayed sealing material comprises the following components in parts by weight: 7 parts of microcapsules, 25 parts of water, and 65 parts of Portland cement.

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PUM

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Abstract

The invention discloses a microcapsule for an expansion-delayed hole-sealing material, which comprises the following components in parts by weight: 0.5-1.5 parts of a capsule core and 10-12 parts of a capsule wall. The material of the invention has remarkable expansion performance, delays expansion, and reduces early invalid expansion and loss of expansion performance. Compared with HCSA not coated with microcapsules, the swelling can be delayed up to 4.93h, and the swelling rate of the slurry increased from 3.01% to 3.39%. The improvement of the expansion performance can lead to the improvement of the compactness of the cement, which in turn can lead to the improvement of the strength, and the expansion rate of the capsule core material HCSA is moderate, which can improve the crack resistance and impermeability of the sealing material, and improve the quality and success rate of the sealing .

Description

technical field [0001] The invention relates to the technical field of sealing materials, in particular to a microcapsule for an expansion-delayed sealing material and a preparation method thereof. Background technique [0002] Coal mine is the main energy source in our country. However, in the process of mining, it is often accompanied by various disasters and accidents. Gas outburst is a prominent problem that seriously restricts the safety of coal mine production. Borehole drainage is the basic means of controlling gas outburst. The sealing of the drilled hole is a key part, and the sealing material affects the sealing effect. [0003] At present, there are mainly three kinds of the most common sealing materials: clay sealing materials, cement mortar sealing materials, and polyurethane sealing materials. The softness and hardness of clay sealing materials are difficult to control, the sealing length is short, and the sealing effect is not ideal; polyurethane sealing mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B20/10C04B22/14E21B33/13
CPCC04B20/1033C04B28/04C04B2111/00663C04B2111/00724E21B33/13C04B22/142C04B22/064
Inventor 吉小利刘健马梦晓罗麒卢婷范春阳
Owner ANHUI UNIV OF SCI & TECH
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