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Low-density coated ceramic proppant prepared through fly ash and preparation method of low-density coated ceramic proppant

A fly ash, low-density technology, applied in the field of low-density film-coated ceramsite proppant and its preparation, can solve the problems of high cost of raw materials, high density of proppant, high cost of use, etc., to reduce firing temperature and increase strength , The effect of reducing the cost of raw materials

Inactive Publication Date: 2015-01-07
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Propants are used as mineralizers or fluxes, such as manganese oxide, calcium oxide, iron oxide, magnesium oxide, zircon, etc. The prepared proppants have higher density and higher cost
In addition, there are also some patents on the use of fly ash to prepare petroleum fracturing proppants, but they only add fly ash as a doping material, and materials with high aluminum content such as bauxite need to be added to the raw materials
For example, Chinese patents with application numbers 201210353045.8, 201310148261.3 and 201310434909.3, although there is fly ash in the raw materials, all of them introduce bauxite, and the cost of raw materials is still high

Method used

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Experimental program
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Effect test

Embodiment 1

[0036] 1) Prepare the raw materials, the raw materials are as follows: fly ash 93wt%, MnO 2 powder 2wt%, potassium feldspar 5wt%; all raw materials are crushed or ground to more than 325 mesh respectively, and then mixed uniformly in proportion; the fly ash used is high alumina fly ash, and its main chemical composition (by weight percentage) For: A1 2 o3 : 45%~55%, SiO 2 : 20%~35%, Fe 2 o 3 : 1%~3%, CaO: 4%~6%, TiO 2 : 1%~4%, the balance is a small amount of Na 2 O, MgO, K 2 O. MnO used 2 Analytical pure, of which: MnO 2 The content is not less than 85.0wt%, and the alkali metal and alkaline earth metal are ≤2.0wt% in terms of sulfate.

[0037] 2) Put the mixed material into the granulator, spray into the binder aqueous solution to granulate, obtain the ceramsite green body, and obtain the ceramsite green body after passing through a 16-30 mesh sieve;

[0038] 3) Dry the screened ceramsite green body at an ambient temperature of 80°C for 4 hours, then put it into an...

Embodiment 2

[0041] 1) Prepare the raw materials, the raw materials are as follows: fly ash 97wt%, MnO 2 Powder 3wt%. All the raw materials are crushed or ground to more than 325 mesh respectively, and then mixed uniformly in proportion; the fly ash used is high-alumina fly ash, and its main chemical composition (by weight percentage) is: A1 2 o 3 : 45%~55%, SiO 2 : 20%~35%, Fe 2 o 3 : 1%~3%, CaO: 4%~6%, TiO 2 : 1%~4%, the balance is a small amount of Na 2 O, MgO, K 2 O; used MnO 2 Analytical pure, of which: MnO 2 The content is not less than 85.0wt%, and the alkali metal and alkaline earth metal are ≤2.0wt% in terms of sulfate.

[0042] 2) Put the mixed material into the granulator, spray into the binder aqueous solution to granulate, obtain the ceramsite green body, and obtain the ceramsite green body after passing through a 16-30 mesh sieve;

[0043] 3) Dry the screened ceramsite green body at 100°C for 3.5 hours, then put it into an electric furnace, raise it to 400°C at a ...

Embodiment 3

[0046] 1) Prepare the raw materials, the raw materials are as follows: fly ash 92wt%, MnO 2 Powder 1wt%, potassium feldspar 7wt%; all raw materials are crushed or ground to more than 325 mesh respectively, and then mixed uniformly in proportion; the fly ash used is high alumina fly ash, and its main chemical composition (by weight percentage) For: A1 2 o 3 : 45%~55%, SiO 2 : 20%~35%, Fe 2 o 3 : 1%~3%, CaO: 4%~6%, TiO 2 : 1%~4%, the balance is a small amount of Na 2 O, MgO, K 2 O. MnO used 2 Analytical pure, of which: MnO 2 The content is not less than 85.0wt%, and the alkali metal and alkaline earth metal are ≤2.0wt% in terms of sulfate.

[0047] 2) Put the mixed material into the granulator, spray into the binder aqueous solution to granulate, obtain the ceramsite green body, and obtain the ceramsite green body after passing through a 16-30 mesh sieve;

[0048] 3) Dry the screened ceramsite green body at 120°C for 3 hours, then put it into an electric furnace, firs...

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Abstract

The invention discloses a low-density coated ceramic proppant prepared through fly ash and a preparation method of the low-density coated ceramic proppant. The low-density coated ceramic proppant is prepared from the following raw materials in percentage by weight: 85-98 wt% of fly ash, 1-5 wt% of MnO2 powder and 0-10 wt% of potassium feldspar powder through the steps of granulation, calcination and coating. In the preparation method, the fly ash is taken as a main raw material, a small amount of additive is used as a fluxing agent, high-aluminum-content materials such as bauxite and the like are not introduced, and the coated ceramic proppant is prepared by a coating process. The prepared coated ceramic proppant has the characteristics that the particle size is 20-40 meshes, the bulk density is smaller than or equal to 1.55 g / cm<3>, the apparent density is smaller than or equal to 2.70 g / cm<3>, the breakage rate is smaller than or equal to 5% at 52 MPa and the breakage rate is smaller than or equal to 9% at 69MPa.

Description

technical field [0001] The invention belongs to the technical field of petroleum fracturing proppants, and specifically relates to a low-density film-coated ceramsite proppant prepared from industrial waste fly ash and a preparation method thereof. Background technique [0002] Hydraulic fracturing technology is an effective method to stimulate oil and gas formations, which can improve the seepage conditions of reservoirs, especially suitable for low permeability oil and gas formations, and is the preferred method and one of the important measures for coalbed methane and oil and gas stimulation. The proppant is the key factor to realize the hydraulic fracture with a certain conductivity. With the maturity of horizontal well fracturing technology in oil and gas fields and the development of shale gas, the higher the strength and the lower the density of the proppant required, the low-density proppant can greatly reduce the settlement of the proppant during the transmission of...

Claims

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Application Information

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IPC IPC(8): C09K8/80
CPCC09K8/805
Inventor 公衍生邓浩罗文君严春杰
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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