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Method for preparing fracturing propping agent specially used for shale gas from poor bauxite

The technology of fracturing proppant and bauxite is applied in the field of preparing proppant and preparing special fracturing proppant for shale gas by using poor bauxite, which can solve the problem of unstable proppant performance, high sintering temperature and production cost. High problems, to achieve the effect of being conducive to environmental protection, reducing the crushing rate, easy to operate and easy to control

Inactive Publication Date: 2014-07-02
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two proppant ceramsites all use high-quality bauxite as the main raw material, which has played a positive role in the rational use of resources, but the performance of the proppant is unstable, the production cost is high, the output is low, the energy consumption is large, and the thermal efficiency is low. , the firing temperature is high (1400°C-1450°C), especially the heat loss is as high as more than 50% by ordinary heating methods, so that fuel accounts for more than half of the total production cost

Method used

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  • Method for preparing fracturing propping agent specially used for shale gas from poor bauxite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Put industrial coke into a ball mill and use alumina balls as balls to add water to wet mill for 1 hour to form powdered carbon slurry, which passes through a 180-mesh sieve; among them, when industrial coke is wet-milled, alumina balls and industrial coke are controlled The mass ratio with water is 2:1:0.6;

[0028] 2) According to the mass percentage, 60% active Al 2 o 3 Powder and 40% silicon micropowder are evenly mixed to obtain a highly active composite sintering aid; among them, the active Al 2 o 3 Powder and silica powder particle size are less than 5μm;

[0029] 3) According to the mass percentage, mix 94% of low-grade bauxite and 6% of composite sintering aid to obtain a mixture, put the mixture into a ball mill, use alumina balls as balls and add water to wet mill for 3 hours, Form a mixed slurry, and the mixed slurry is passed through a 320-mesh sieve; wherein, when the mixed material is wet-ground, the mass ratio of the alumina ball stone, the mixed ...

Embodiment 2

[0034] 1) Put industrial coke into a ball mill and use alumina balls as balls to add water to wet mill for 0.9h to form powdered carbon slurry, which passes through a 180-mesh sieve; among them, during wet grinding of industrial coke, control alumina balls, industrial The mass ratio of coke and water is 2.2:1:0.7;

[0035] 2) According to the mass percentage, 65% active Al 2 o 3 Powder and 35% silicon powder are evenly mixed to obtain a highly active composite sintering aid; among them, the active Al 2 o 3 Powder and silica powder particle size are less than 5μm;

[0036] 3) According to the mass percentage, mix 95% of low-grade bauxite and 5% of composite sintering aid to obtain a mixture, put the mixture into a ball mill, use alumina balls as balls and add water to wet mill for 2.5 hours , form mixed mud, mixed mud crosses 320 mesh sieves; Wherein, when mixed material wet grinding, the mass ratio of controlling alumina ball stone, mixed material and water is 2.2:1:0.6; ...

Embodiment 3

[0041] 1) Put the industrial coke into the ball mill, use alumina balls as the balls and add water for wet grinding for 0.8h, and the grinding time is 20 to form powdered carbon slurry, which passes through a 180-mesh sieve; among them, during wet grinding of industrial coke, control alumina The mass ratio of ball stone, industrial coke and water is 2.3:1:0.7;

[0042] 2) According to the mass percentage, 70% active Al 2 o 3 Powder and 30% silicon micropowder are evenly mixed to obtain a highly active composite sintering aid; among them, the active Al 2 o 3 Powder and silica powder particle size are less than 5μm;

[0043] 3) According to the mass percentage, mix 96% of aluminum ore waste and 4% of composite sintering additives to obtain a mixture, put the mixture into a ball mill, use alumina balls as balls and add water to wet mill for 2 hours to form Mix the mud, and pass the mixed mud through a 320-mesh sieve; wherein, when the mixed material is wet-ground, the mass ra...

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Abstract

The invention relates to a method for preparing a fracturing propping agent specially used for a shale gas from poor bauxite. The method comprises the following steps of: placing poor bauxite and a high-activity compound type sintering additive into a ball grinding mill and carrying out wet grinding to form mixed mud; with the mixed mud as a coating solution, carrying out primary pelletizing by adopting a fluidized bed mist spray pelletizer; with burgy slurry formed after the wet grinding as a coating solution, carrying out secondary pelletizing, carrying out moulding for twice, putting the obtained ball-like particles into a crucible, then putting the crucible into an electric furnace and carrying out ultralow temperature self-propagating sintering; and naturally cooling and then taking out to obtain the fracturing propping agent specially used for the shale gas. According to the method for preparing the fracturing propping agent, a poor bauxite resource is developed and utilized, raw materials are well-sourced, less kinds of the raw materials are adopted, a burdening process is simple, a self-propagating sintering temperature is low, a sintering period is short, energy is saved, the purposes of low carbon and environmental protection are achieved, and combination properties of the fracturing propping agent are improved; the adopted moulding method is low in energy consumption, a production process is simple and easy to control, and product quality is stable; and the prepared propping agent is low in density and high in strength and has the characteristics of high temperature resistance and corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a method for preparing a proppant, in particular to a method for preparing a special fracturing proppant for shale gas by utilizing poor bauxite. Background technique [0002] Fracturing technology is an effective weapon for increasing production and efficiency in the development of low-porosity and low-permeability shale gas reservoirs. Shale gas is different from conventional gas reservoirs in that shale is not only the source rock for natural gas generation, but also the reservoir and caprock for accumulating and preserving natural gas. Shale gas reservoirs have low permeability and are difficult to exploit. Shale gas reservoirs generally have low porosity and low permeability physical properties, and the resistance to gas flow is greater than that of conventional natural gas. Therefore, the ultimate recovery of shale gas rate depends on effective fracturing measures. In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622C09K8/80
CPCY02P20/10
Inventor 陈平殷海荣
Owner SHAANXI UNIV OF SCI & TECH
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