Method for preparing fracturing propping agent special for shale gas from fly ash

Abstract

The invention relates to a method for preparing a fracturing propping agent special for shale gas from fly ash. The method comprises the following steps of: performing wet grinding on the fly ash, kaolinite, a high-activity compound sintering aid and a small amount of industrial coke to form mixed slurry in a ball mill; performing primary granulation on the mixed slurry in a fluidized bed spray granulator; performing secondary granulation by using powdered coal slurry formed by wet grinding of coke as coating liquid; putting balled granules into a crucible; and putting the crucible into an electric furnace for ultralow temperature self-propagating sintering, cooling naturally and then taking the crucible out of the electric furnace to obtain the fracturing propping agent special for shale gas. By adopting the method, 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 prepared 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 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 fly ash. 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 technology is...

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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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