Method for preparing fracturing propping agent special for shale gas from waste slag

A technology of fracturing proppant and waste slag, which is applied in the direction of earthwork drilling, mining fluid, wellbore/well parts, etc., which can solve the problems of high production cost of proppant, high firing temperature, and high heat loss, and achieve favorable The effects of environmental protection, reduction of broken rate and reduction of energy consumption

Inactive Publication Date: 2015-06-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method of proppant preparation has played a positive role in the rational utilization of resources, but the production cost of the proppant is still high, the output is low, the energy consumption is large, the thermal efficiency is low, and the firing temperature is high (1400°C-1450°C). In particular, the heat loss of ordinary heating methods is as high as more than 50%, 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 special for shale gas from waste slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 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 wet grinding industrial coke, control alumina balls and industrial coke The mass ratio with water is 2:1:0.6;

[0030] 2) According to the mass percentage, 60% active Al 2 o 3 Powder and 40% MgO powder are evenly mixed to obtain a highly active composite sintering aid; among them, the active Al 2 o 3 The particle size of powder and MgO micropowder are both less than 5μm;

[0031] 3) According to the mass percentage, mix 60% gold tailing waste slag, 35% raw bauxite and 5% composite sintering aid to obtain a mixture, put the mixture into a ball mill to form alumina balls Add water to the balls and wet grind for 3 hours to form a mixed slurry, and pass the mixed slurry through a 320-mesh sieve; wherein, when wet grinding the mixture, control the mass ratio of alumina balls, mix...

Embodiment 2

[0036] 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, when wet grinding industrial coke, control alumina balls, industrial The mass ratio of coke and water is 2.2:1:0.7;

[0037] 2) According to the mass percentage, 65% active Al 2 o 3 Powder and 35% MgO powder are evenly mixed to obtain a highly active composite sintering aid; among them, the active Al 2 o 3 The particle size of powder and MgO micropowder are both less than 5μm;

[0038] 3) According to the mass percentage, mix 65% lead-zinc ore tailings waste residue, 27% raw bauxite and 8% composite sintering aid to obtain a mixture, put the mixture into a ball mill and use alumina balls The stone is wet-milled with balls and water for 2.5 hours to form a mixed slurry, and the mixed slurry is passed through a 320-mesh sieve; wherein, when wet-grinding the mixture, the mass ratio of...

Embodiment 3

[0043] 1) Put industrial coke into a ball mill and use alumina balls as balls to add water to wet mill for 0.8h to form powdered carbon slurry, which passes through a 180-mesh sieve; among them, when wet grinding industrial coke, control alumina balls, industrial The mass ratio of coke and water is 2.3:1:0.7;

[0044] 2) According to the mass percentage, 70% active Al 2 o 3 Powder and 30% MgO powder are evenly mixed to obtain a highly active composite sintering aid; among them, the active Al 2 o 3 The particle size of powder and MgO micropowder are both less than 5μm;

[0045] 3) According to the mass percentage, mix 70% manganese ore waste residue, 20% raw bauxite and 10% composite sintering aid to obtain a mixture, and put the mixture into a ball mill with alumina balls as grinding balls Add water and wet grind for 2 hours to form a mixed slurry, and pass the mixed slurry through a 320-mesh sieve; wherein, when wet grinding the mixed material, control the mass ratio of a...

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Abstract

The invention relates to a method for preparing a fracturing propping agent special for shale gas from waste slag. The method comprises the following steps of: performing wet grinding on the waste slag, bauxite and a compound sintering aid to form mixed slurry; performing primary granulation in a fluidized bed spray granulator by using the mixed slurry as coating liquid; performing secondary granulation by using powdered coal slurry formed by wet grinding of coke as coating liquid; shaping for two times; putting balled granules into a crucible; and putting the crucible into an electric furnace for ultralow temperature self-propagating sintering, and cooling naturally to obtain the fracturing propping agent special for shale gas. By adopting the method, the waste slag is changed to be valuable, the raw material has a wide source, the temperature of the self-propagating sintering is low, the sintering period is short, energy resources are saved, a low-carbon environmental protection effect is achieved, and the comprehensive performance of the product is improved; a shaping method adopted in the method is low in energy consumption, the production process is simple and easy to control, and the product quality is stable; and the obtained propping agent is low in density and high in strength, has excellent characteristics of high-temperature resistance and corrosion resistance, and can provide a fracturing material with better performance for medium and deep layer shale gas fields.

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 waste slag. 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 t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/00C04B35/622C09K8/80
Inventor 陈平刘凯刘毅张小帅
Owner SHAANXI UNIV OF SCI & TECH
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