Silane coupler-coated self-repairing agent as well as preparation and application thereof

A silane coupling agent, self-healing technology, applied in chemical instruments and methods, wellbore/well components, drilling composition, etc., can solve problems such as self-healing efficacy not mentioned, and achieve guaranteed service life and mining. Safety, the effect of improving toughness and crack resistance

Inactive Publication Date: 2013-12-25
XI'AN PETROLEUM UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] It can be seen that the silane coupling agent is not used in the cementing slurry system, but in other fields, most of the emphasis is on improving the adhesion, and the self-healing effect is not mentioned.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A silane coupling agent-coated self-healing agent, which consists of 100 parts by weight of slag and 1.0 parts by weight of silane coupling agent KH560. The main function of the slag is to form the potential activity of the self-healing agent. Once the surface is coated with waterproof Once the layer is damaged, it can undergo hydration reaction with calcium hydroxide crystals and other unhydrated products in the cement sheath to repair the damaged part of the cement sheath.

[0025] The preparation method of this self-healing agent comprises the steps:

[0026] 1. Put the slag into a solid mixer (high-speed solid mixer, V-shaped solid mixer, etc.), keep the mixer speed at 4000 rpm for stirring, spray the silane coupling agent KH560 directly on the slag and stir for 30 minutes.

[0027] 2. Put the mixture obtained in step 1 into a solid pulverizing mixer, keep the rotating speed of 40000 rpm, pulverize and stir for 30 minutes.

Embodiment 2

[0029] A silane coupling agent-coated self-healing agent, which consists of 100 parts by weight of slag and 2.0 parts by weight of silane coupling agent KH560. The main function of the slag is to constitute the potential activity of the self-healing agent. Once the layer is damaged, it can undergo hydration reaction with calcium hydroxide crystals and other unhydrated products in the cement sheath to repair the damaged part of the cement sheath.

[0030] The preparation method of this self-healing agent comprises the steps:

[0031] 1. Put the slag into a solid mixer (high-speed solid mixer, V-shaped solid mixer, etc.), keep the mixer speed at 4000 rpm for stirring, spray the silane coupling agent KH560 directly on the slag and stir for 30 minutes.

[0032] 2. Put the mixture obtained in step 1 into a solid pulverizing mixer, keep the rotating speed of 40000 rpm, pulverize and stir for 30 minutes.

Embodiment 3

[0034] A silane coupling agent-coated self-healing agent, which consists of 100 parts by weight of slag and 3.0 parts by weight of silane coupling agent KH570. The main function of the slag is to form the potential activity of the self-healing agent. Once the surface is coated with waterproof Once the layer is damaged, it can undergo hydration reaction with calcium hydroxide crystals and other unhydrated products in the cement sheath to repair the damaged part of the cement sheath.

[0035] A preparation method of a silane coupling agent-coated self-healing agent, comprising the steps of:

[0036] 1. Put the slag into a solid mixer (high-speed solid mixer, V-shaped solid mixer, etc.), keep the mixer speed at 4000 rpm for stirring, spray the silane coupling agent KH570 directly on the slag and stir for 30 minutes.

[0037] 2. Put the mixture obtained in step 1 into a solid pulverizing mixer, keep the rotating speed of 40000 rpm, pulverize and stir for 30 minutes.

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PUM

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Abstract

The invention relates to a silane coupler-coated self-restoration agent which is prepared from the following components in parts by weight: 100 to 130 parts of active mineral and 0.2 to 7.0 parts of silane coupler, wherein the active mineral is of mineral residues, coal ash, cement or coal gangue; and the KH560 silane coupler and the KH570 silane coupler are adopted. The invention further provides a preparation method and an application of the silane coupler-coated self-repairing agent. The active mineral is coated by the silane couplers, so that a waterproof protective film is formed on the surface of the active mineral. Thus, the activity of the active mineral is changed into the potential activity. Therefore, the active mineral cannot participate in a hydration reaction in a cement slurry system for well cementation, and can perform the hydration reaction only when the surface film of the active mineral is damaged due to the damage of a cement ring for the well cementation, so that a hydration product is formed so as to automatically repair the damaged position of the cement ring. As a result, the silane coupler-coated self-restoration agent has a great significance for guaranteeing the service life and the mining safety of oil and gas wells.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling and cementing, and in particular relates to a silane coupling agent-coated self-healing agent and its preparation and application. Background technique [0002] The cement sheath of oil and gas well cementing is a brittle material that is easy to shrink like the cement-based material on the building. In addition to the influence of various well tests, tests, production, production operations and formation conditions, the casing and cement sheath are affected. The impact of large changes in various factors such as temperature and pressure and the corrosion of various acidic fluids (such as carbon dioxide, hydrogen sulfide, etc.) in the well will inevitably produce micro-cracks inside the cement sheath. Micro-gap will be generated at the cemented interface, or the porosity of the cement sheath will increase, resulting in damage to the cement sheath of oil and gas well cementing. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467E21B33/16
Inventor 杨振杰吕志贤刘善广许波梅露强姜晓强
Owner XI'AN PETROLEUM UNIVERSITY
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