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Ultralow-density proppant and preparation method thereof

An ultra-low density, proppant technology, applied in chemical instruments and methods, earthwork drilling, mining fluids, etc., can solve the problems of high density of ceramsite proppant, limited bauxite resources, high cost, and improve the anti-fragmentation. capacity, lower construction cost, good acid resistance

Inactive Publication Date: 2015-11-18
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Quartz sand can only be used for shallow well fracturing with low closure pressure due to its low strength. Ceramsite is mainly prepared from bauxite or other high-alumina materials. The prepared ceramsite proppant has a relatively high density, mostly at 3.2g / cm 3 Above, and bauxite resources are limited, the cost is also higher

Method used

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  • Ultralow-density proppant and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] A kind of ultra-low density proppant, preparation method is as follows:

[0030] (1) Preparation of ceramsite green body: mix the raw materials for preparing porous ceramsite evenly, put them into a granulator, add water to granulate, and sieve to obtain ceramsite green body. The method of adding water is to spray and add an appropriate amount of water to prepare porous ceramsite. The weight ratio of each component of the raw material is: 93 parts of fly ash, 5 parts of potassium feldspar, 2 parts of manganese powder, and 2 parts of SiC micropowder;

[0031] (2) Preparation of porous ceramsite: after drying the ceramsite green body obtained in step (1), calcining at 1300° C. for 2 hours, passing through a 20 / 40 mesh sieve to obtain porous ceramsite;

[0032] (3) Preparation of epoxy resin-coated ceramsite intermediate: After cleaning and drying the porous ceramsite obtained in step (2), take 100 g and modify it with a silane coupling agent solution, and immerse the poro...

Embodiment 2

[0035] A kind of ultra-low density proppant, preparation method is as follows:

[0036](1) Preparation of ceramsite green body: mix the raw materials for preparing porous ceramsite evenly, put them into a granulator, add water to granulate, and sieve to obtain a ceramsite green body. The weight ratio of the components is: 93 parts of fly ash, 5 parts of potassium feldspar, 2 parts of manganese powder, and 30 parts of SiC micropowder;

[0037] (2) Preparation of porous ceramsite: after drying the ceramsite green body obtained in step (1), calcining at 1200° C. for 3 hours, passing through a 20 / 40 mesh sieve to obtain porous ceramsite;

[0038] (3) Preparation of epoxy resin-coated ceramsite intermediate: After cleaning and drying the porous ceramsite obtained in step (2), take 100 g and modify it with a silane coupling agent solution, and immerse the porous ceramsite in the silane coupling agent solution, and stirred at 85°C for 10 hours, dried and added to 70g epoxy resin dil...

Embodiment 3

[0041] A kind of ultra-low density proppant, preparation method is as follows:

[0042] (1) Preparation of ceramsite green body: mix the raw materials for preparing porous ceramsite evenly, put them into a granulator, add water to granulate, and sieve to obtain a ceramsite green body. The weight ratio of the components is: 65 parts of fly ash, 3 parts of potassium feldspar, 2 parts of manganese powder, and 30 parts of SiC micropowder;

[0043] (2) Preparation of porous ceramsite: after drying the ceramsite green body obtained in step (1), calcining at 1220° C. for 3 hours, passing through a 20 / 40 mesh sieve to obtain porous ceramsite;

[0044] (3) Preparation of epoxy resin-coated ceramsite intermediate: After cleaning and drying the porous ceramsite obtained in step (2), take 100 g and modify it with a silane coupling agent solution, and immerse the porous ceramsite in the silane coupling agent solution, and stirred at 85°C for 10 hours, dried and added to 80g epoxy resin di...

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Abstract

The invention relates to an ultralow-density proppant and a preparation method thereof. The proppant comprises porous ceramisite and resin films covering the porous ceramisite, wherein the porous ceramisite is obtained by mixing, granulating and calcining raw materials, and the raw materials comprise, in parts by weight, 65-94 parts of fly ash, 1-5 parts of potash feldspar, 1-3 parts of manganese powder and 2-30 parts of SiC micropowder; the resin film comprises epoxy resin on the inner layer and phenolic resin on the outer layer. The preparation method comprises steps as follows: the raw materials are uniformly mixed, granulated by a sugarcoating machine, dried and sintered at the high temperature, and the porous ceramisite is prepared and immersed in the epoxy resin diluent, a ceramsite immersion body is obtained and coated with the phenolic resin, and the ultralow-density proppant is obtained. The granularity of the proppant ranges from 20 meshes to 40 meshes, the acid resistance is good, the apparent density is as low as 1.70 g / cm<3>, the breakage rate under the pressure of 52 MPa is smaller than 4.0%, the density is low, precipitation is not easily caused, the proppant can be easily taken into a well, the use quantity of the proppant can be effectively reduced, and the fracturing construction cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of solid proppant for oil and gas well fracturing technology, and relates to an ultra-low density proppant and a preparation method thereof. Background technique [0002] Hydraulic fracturing is an important new technology for oil and natural gas low-permeability oil and gas wells to increase production, and proppant is the key material for fracturing construction. During deep well fracturing, the proppant is brought in by the fracturing fluid and supported in the fractures of the fracturing formation, preventing the closure of the fractures and providing a conduction channel for oil and gas seepage. It can increase the conductivity of the formation, improve oil and gas production and Prolonging the life of oil wells is an important factor in the application of fracturing technology. [0003] Studies have shown that the fracturing cost of oil and gas wells will increase with the increase of proppant density...

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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