Coal gangue ceramsite proppant and preparation method thereof

A coal gangue ceramsite and proppant technology, applied in chemical instruments and methods, earth square drilling, clay products, etc., can solve the problems of adapting to high closing pressure, low crushing rate, high volume density and high crushing rate, and achieve pressure reduction Cracking costs, the effect of environmental protection

Inactive Publication Date: 2019-04-16
攀枝花秉扬科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ceramsite of the invention has high strength, low density, and is suitable for ceramsite proppant used in deep oil and gas well fracturing with high closure pressure and low permeability; and the sintering temperature is relatively lower, ranging from 1300 to 1380 ° C, effectively reducing energy consumption. energy consumption, can save energy by 20%; at the same time achieve the effect of small crushing rate, but only use coal gangue as the inner core, the sintering temperature is relatively high, the heat consumption is high, and its volume density and crushing rate are high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] After mixing 40% coal gangue and 55% hard clay by weight (the same below), pre-sintering in a shaft furnace at 800°C for 2 hours, then adding 1.5% molding agent and 3.5% sintering aid, Further grinding, mixing evenly, the fineness of the powder is controlled below 400 mesh, the moisture content is 9%, and the uniformity of the mixture after mixing is greater than 98%. The ball core with a particle diameter of ≤0.2mm is generated in the disc granulator with a revolution / minute, and the fine powder is coated successively. The ore phase structure is consistent and uniform, and the sphericity of the particles reaches above 0.85. The sintering is carried out in a rotary kiln, the sintering temperature is controlled at 1350-1390° C., and the sintering time is 2.5 hours to obtain the low-density and high-strength ceramic particles of the present invention.

[0057] The acid solubility of the test product is 5.3%, and the bulk density is 1.5g / cm 3 , the particle size is 30-50 ...

Embodiment 2

[0059] After mixing 55% coal gangue and 40% hard clay by weight (the same below), pre-sinter in a shaft furnace at 850°C for 1.5 hours, then add 1.5% forming agent and 3.5% sintering aid , further grinding, mixing evenly, the fineness of the powder is controlled below 400 mesh, the moisture content is 10.5%, and the uniformity of the mixed material after mixing is greater than 98%. The 60 rpm disc granulator generates ball cores with a particle size of ≤0.2mm, and the fine powder is coated successively, and the ball cores are densely grown to make balls with a diameter of ≤1.0mm. The chemical composition of ceramsite, ore The phase structure is consistent and uniform, and the sphericity of the granulated particles reaches more than 0.85. Sintering is carried out in a rotary kiln, the sintering temperature is controlled at 1310-1350 ° C, and the sintering time is 3 hours to obtain the low-density and high-strength ceramic particles of the present invention.

[0060] The acid so...

Embodiment 3

[0062] After mixing 60% coal gangue and 35% hard clay by weight (the same below), pre-sinter in a shaft furnace at 850°C for 1.5 hours, then add 2% molding agent and 3% sintering aid , further grinding, mixing evenly, the fineness of the powder is controlled below 400 mesh, the moisture content is 11%, and the uniformity of the mixture after mixing is greater than 98%. The 60 rpm disc granulator generates ball cores with a particle size of ≤0.2mm, and the fine powder is coated successively, and the ball cores are densely grown to make balls with a diameter of ≤1.0mm. The chemical composition of ceramsite, ore The phase structure is consistent and uniform, and the sphericity of the granulated particles reaches more than 0.85. Sintering is carried out in a rotary kiln, the sintering temperature is controlled at 1290-1320° C., and the sintering time is 3.5 hours to obtain the low-density and high-strength ceramic particles of the present invention.

[0063] The acid solubility of...

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Abstract

The invention relates to a coal gangue ceramsite proppant and a preparation method thereof. The proppant comprises, by weight, 30%-70% of coal gangue, 20%-65% of flint clay, 5%-10% of a sintering aidand 1-3% of a forming agent. The coal gangue is solid wastes which are discharged in coal collecting process and coal washing process, the silica content is higher, the aluminum content is lower, thecalorific value of the solid waste coal gangue is fully utilized in the preparation process, meta components of the coal gangue are completely utilized again to reduce the volume density of sintered ceramsite to better adapt to the technical demands of oil well fracturing construction, fracturing cost is reduced, and the use of high-grade bauxite resources is reduced to help to protect the environment.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and relates to a coal gangue ceramsite proppant and a preparation method thereof. Background technique [0002] Coal gangue is solid waste discharged during coal mining and coal washing, and it is also one of the largest industrial wastes currently discharged. The cumulative stock in China is billions of tons, occupying a large amount of land, causing waste of resources and affecting production development. The treatment and comprehensive utilization of coal gangue has become an urgent problem to be solved. The calorific value remaining in coal gangue is about 5000kJ / kg, of which Al 2 o 3 , SiO 2 It is the main chemical component of the mineral phase of ceramic particles, other CaO, MgO, K 2 O, Na 2 O, etc. are important auxiliary components involved in the sintering process. [0003] Fracturing proppants play an important role in oil and gas production and are one of the key...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C09K8/80
CPCC04B33/1324C04B2235/3201C04B2235/3232C04B2235/3239C04B2235/3267C04B2235/3272C04B2235/3409C04B2235/656C04B2235/6567C04B2235/6583C04B2235/77C04B2235/95C04B2235/96C09K8/80Y02P40/60
Inventor 樊荣李华彬
Owner 攀枝花秉扬科技股份有限公司
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