Method for preparing special fracturing propping agent for shale gas by utilizing industrial waste

Abstract

The invention provides a method for preparing a special fracturing propping agent for shale gas by utilizing industrial wastes. The method comprises the following steps of: calcining fly ashes and / or coal gangues, grinding by using an air-current mill, screening, so as to form waste residue powders; weighing the waste residue powders, kaolin and polycrystalline silicon powders in proportion, putting in a mixer to mix uniformly, and prilling to balls; putting particles after balling into a crucible, sintering in an electric furnace, and taking out after natural cooling, thereby obtaining the special fracturing propping agent for the shale gas. The method provided by the invention has the advantages that the raw material is extensive in source, the micro structure of a porcelain body is improved, the firing temperature is low, the firing period is short, the method is energy-saving, low-carbon and environment-friendly, and the integrated performance of products is improved; the prepared propping agent has the excellent characteristics of low density, high intensity, high-temperature resistance and corrosion resistance and the like, and can provide a fracturing material with good performance for middle / deep-layer shale gas fields.

Description

technical field [0001] The invention relates to a method for preparing a fracturing proppant, in particular to a method for preparing a special fracturing proppant for shale gas by using industrial waste. Background technique [0002] As a new industry, fracturing proppant has not been developed for a long time in my country, its product structure and varieties are still far from perfect, and the processing scale and level of the industry are in the initial stage of development. Most oil and gas fields are of medium depth, requiring fracturing proppants to have high strength and low fragmentation rate to withstand the huge pressure of the rock formation and various corrosions in the formation environment. In the world, sintered corundum products are often used as fracturing proppants in medium and deep oil and gas fields. Although this product can meet the requirements in terms of physical and chemical properties, the source of raw materials is difficult, the processing tech...

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Problems solved by technology

Chinese patent CN201010136972.5 discloses "low-density ceramsite proppant and its preparation method", which changes the molding method and uses the ingenious way of multi-layer cladding to synthesize a nodular reinforced proppant with an inner core and an outer shell, which improves the Product performance, but the molding method is too complicated and the handling is not strong, which affects the prospect of industrial production and promotion and application

[0009] At present, low-density, high-strength and corrosion resistance have become the main research trend of proppant ceramsite. To achieve this goal, different high-temperature fluxes are introduced into the proppant formula, which improves the mechanical properties of the proppant to a certain extent and improves the material quality. However, it still cannot fundamentally solve the shortcomings of poor mechanical properties and high sintering temperature of ceramsite proppant.

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