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Composite particle, and preparation method and application thereof

A technology of composite particles and elastic particles, applied in the field of oil and gas well cementing, can solve the problems of limited use, easy to float, temperature resistance, poor temperature resistance, etc., and achieves improved mechanical properties, improved hydrophilic properties, and good stability. Effect

Active Publication Date: 2017-04-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the materials commonly used to improve the elastic properties of cement stone mainly include: styrene-butadiene latex latex, styrene-acrylic latex, rubber particles and organic resins, etc., but the high price of latex and organic resins limits their wide use. The application of granular and resin materials in oil and gas well cementing is affected due to their poor temperature resistance and their own defects.
Among them, rubber particles have become the preferred material for many elastic cement slurry systems due to their wide range of sources and low price. However, their surface is hydrophobic, easy to float and poor in temperature resistance, which has greatly restricted their application.

Method used

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  • Composite particle, and preparation method and application thereof
  • Composite particle, and preparation method and application thereof
  • Composite particle, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 100 parts by weight, average particle size of 120 microns, particle size d 50 = 123 microns, elastic modulus of 0.6GPa, Shore hardness of 70, and 30 parts of nitrile rubber particles with a carbon content of 0.5wt% added to the spherical silica fume (average particle size is 1.45 microns, particle size d 50 =1.40 microns, stir uniformly, and adjust the composite particle mixing system (Tsinghua University, PCS-1) to rotate at 2500 rpm, control the feed rate to 5kg / min, and cover for 30 minutes. The average particle size is 180 microns. Path d 50 = 175 micron composite particles.

Embodiment 2

[0035] 100 parts by weight, average particle size of 180 microns, particle size d 50 = 165 microns, elastic modulus of 0.8GPa, Shore hardness of 85, 0.5% carbon content of styrene butadiene rubber particles added to 20 parts by weight after spheronization, average particle size is 5.6 microns, particle size d 50 =5.4 microns, 0.5% carbon content of fly ash, stir evenly, and adjust the PCS-1 rotation speed 2000 rpm, control the feed rate 5kg / min, the coating time 20 minutes, the average particle size of the collected product is 250 Micron, particle size d 50 = 240 micron composite particles.

Embodiment 3

[0037] 100 parts by weight, average particle size of 120 microns, particle size d 50 = 125 microns, elastic modulus of 0.5 GPa, Shore hardness of 60, 0.5% carbon content of styrene butadiene rubber particles added to 10 parts by weight after spheronization, the average particle size is 1.6 microns, particle size d 50 =1.2 micron metakaolin, stir evenly, and adjust the PCS-1 rotation speed to 1000 rpm, control the feed rate 5kg / min, the coating time 20 minutes, the average particle size of the collected product is 215 microns, the particle size d 50 = 220 micron composite particles.

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Abstract

The invention relates to the technical field of oil gas well cementing, and especially relates to a composite particle, and a preparation method and an application thereof. The composite particle comprises a core which is an elastic particle and a shell layer which is a rigid particle and coats the external surface of the core. The preparation method of the composite particle is characterized in that airflow entrainment is used to drive the elastic particle and the rigid particle to move relative to each other in order to form the composite particle. The composite particle has high temperature resistance, improves the acid and alkali resistance of the elastic particle, has good stability, has good compatibility with cement mortar, has no floatation phenomenon, has no thickness increase phenomenon in the curing process, obviously reduces the elastic modulus of set cement, increases the deformation ability of the set cement, is spherical, and facilitates increase of the fluidity of the cement mortar.

Description

Technical field [0001] The invention relates to the technical field of oil and gas well cementing, in particular to a composite particle, a preparation method and application thereof. Background technique [0002] As the pressure phenomenon in gas well annulus becomes more and more common, the sealing quality and durability of cement annulus has attracted more and more attention in the industry. However, conventional cement stone is a brittle material, and the cement ring is prone to cracks or micro-annular gaps during long-term production or operation of oil wells, resulting in wellhead pressure. In particular, the current application of staged fracturing technology for shale oil and gas and tight oil and gas wells has higher requirements on the elastic deformability of cement, which requires the cement to be able to couple with casing deformation. Therefore, in order to effectively improve the long-term sealing ability of cement stone, it is necessary to effectively improve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G5/00C05G3/00
Inventor 陶谦周仕明刘伟刘建
Owner CHINA PETROLEUM & CHEM CORP
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