Method of using coal gangue to prepare fracturing propping agent

A technology for fracturing proppant and coal gangue, which can be used in earth-moving drilling, fluid production, wellbore/well components, etc., and can solve the problems of poor mechanical properties and high brittleness of proppant.

Active Publication Date: 2012-10-10
SHAANXI UNIV OF SCI & TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0010] At present, low density, high strength, low brittleness and corrosion resistance have become the main research trend of proppant ceramsite. In order to achieve this goal, different high-temperature fluxes were introduced into the proppant formula and the way of ceramsite molding was optimized, which improved to a certain extent. The mechanical properties of the proppant improve the acid resistance and salt resistance of the material. However, it still cannot fundamentally solve the shortcomings of the poor mechanical properties (brittleness) of the ceramsite proppant

Method used

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  • Method of using coal gangue to prepare fracturing propping agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Put coal gangue and alumina powder into a ball mill for dry grinding, use alumina ball stone as the grinding medium, control the mass ratio of balls and raw materials to 2:1, ball mill for 0.5h to 2h respectively, and then pass through 120 Mesh sieve;

[0028] 2) According to mass percentage, mix 40% sieved coal gangue, 45% alumina powder, 5% barium carbonate and 10% alumina chopped fiber to obtain a mixture, put the mixture into a ball mill and then add Mix the gum solution with a mass concentration of 10%, use alumina ball stone as the grinding medium, control the mass ratio of the grinding ball, the mixture and the gum solution to 2:1:0.3, grind for 0.5h to 3h to form a mixed slurry, and the slurry is over 300 Mesh sieve;

[0029] Among them, the alumina powder is α-alumina for industrial use, that is, corundum powder, its corundum content is >98%, and the particle diameter of the powder is <10μm; The obtained slag-free unidirectionally extended fibers have a di...

Embodiment 2

[0033] 1) Put coal gangue and alumina powder into a ball mill for dry grinding, use alumina ball stone as the grinding medium, control the mass ratio of balls and raw materials to 2.5:1, ball mill for 0.5h to 2h and pass through 120 meshes respectively sieve;

[0034] 2) According to mass percentage, mix 55% sieved coal gangue, 35% alumina powder, 3% barium carbonate and 7% alumina chopped fiber to obtain a mixture, put the mixture into a ball mill and then add Mix the gum water solution with a mass concentration of 10% and use alumina ball stone as the grinding medium, control the mass ratio of the grinding ball, the mixture and the gum water solution to 2.5:1:0.35, grind for 0.5h to 3h to form a mixed mud, and the mud is over 300 Mesh sieve;

[0035] Among them, alumina powder is α-alumina or corundum powder for industrial use, its corundum content is > 98%, and the particle diameter of the powder is < 10 μm; The obtained slag-free unidirectionally extended fibers have a d...

Embodiment 3

[0039] 1) Put coal gangue and alumina powder into a ball mill for dry grinding, use alumina ball stone as the grinding medium, control the mass ratio of balls and raw materials to 3:1, ball mill for 0.5h to 2h respectively, and then pass through 120 Mesh sieve;

[0040] 2) According to mass percentage, mix 45% sieved coal gangue, 40% alumina powder, 8% barium carbonate and 7% alumina chopped fiber to obtain a mixture, put the mixture into a ball mill and then add Mix the gum water solution with a mass concentration of 10% and use alumina ball stone as the grinding medium, control the mass ratio of the grinding ball, the mixture and the gum water solution to 3:1:0.38, grind for 0.5h to 3h to form a mixed mud, and the mud is over 300 Mesh sieve;

[0041] Among them, alumina powder is α-alumina or corundum powder for industrial use, its corundum content is > 98%, and the particle diameter of the powder is < 10 μm; The obtained slag-free unidirectionally extended fibers have a d...

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Abstract

The invention discloses a method of using coal gangue to prepare fracturing propping agent. The method includes: mixing coal gangue, alumina powder, barium carbonate and alumina chopped fibers, adding the mixture into gum aqueous solution to be subjected to uniform mixing and wet grinding to form mixed slurry, using a pressure atomizing granulator for granulating, putting particles into an alumina crucible which is positioned in a silicon carbide rod resistance furnace, heating from the room temperature to 1230 DEG C at the speed of 5 DE G C / min-10 DE G C / min, preserving heat for 0.5-1h, heating to 1350-1400 DE GC at the speed of 5 DE G C / min-7 DE G C / min, preserving heat for 2-3h, taking out after natural furnace cooling, and screening with a 20mesh-40mesh sieve to obtain the composite fracturing propping agent. The alumina chopped fibers are introduced, the concept of composite materials is integrated into the noncompact ceramsite propping agent, and fibers (whiskers) necessary for strength and toughness improvement are provided by means of self-generation in high-temperature reaction, and the composite fracturing propping agent which is high in strength and toughness and low in density and breakage rate is prepared by means of fiber enhancement and particle enhancement.

Description

technical field [0001] The invention relates to a method for preparing a ceramic composite material by using industrial waste, in particular to a method for preparing a fracturing proppant by using coal gangue. Background technique [0002] As a new industry, fracturing proppant has not been developed for a long time in my country, its product structure and varieties are still far from perfect, and the processing scale and level of the industry are in the initial stage of development. Most oil and gas fields are of medium depth, requiring fracturing proppants to have high strength and low fragmentation rate to withstand the huge pressure of the rock formation and various corrosions in the formation environment. In the world, sintered corundum products are often used as fracturing proppants in medium and deep oil and gas fields. Although this product can meet the requirements in terms of physical and chemical properties, the source of raw materials is difficult, the processin...

Claims

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Application Information

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IPC IPC(8): C04B35/78C04B35/80C04B35/00C04B35/622C09K8/80
Inventor 陈平殷海荣
Owner SHAANXI UNIV OF SCI & TECH
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