Ultralow-density ceramsite proppant prepared from silica and preparation method of ceramsite proppant

Abstract

The invention relates to an ultralow-density ceramsite proppant prepared from silica and a preparation method of the ceramsite proppant. The ceramsite proppant consists of the following raw materials in parts by weight: 60-80 parts of silica, 5-30 parts of low-aluminum and high-iron bauxite, 1-7 parts of limestone, 1-6 parts of talcum and 1-7 parts of forsterite powder. The preparation method comprises the following steps: breaking and intermediately crushing the raw materials, proportioning the raw materials in proportion, grinding the raw materials by virtue of a wet-process ball mill, removing large particles by virtue of a sieve of 80-110 mesh, and spray-drying so as to obtain a powdery material; forcedly balling the powdery material, drying the material until water content is less than 5wt%, and sieving by virtue of 18-30 mesh so as to obtain a half-finished product; and calcining the half-finished product to obtain a product, cooling the product to room temperature and sieving the product by virtue of 20-40 mesh so as to obtain a finished product with proper grain size, wherein the grain size of the broken raw materials is less than 0.056mm. The ceramsite proppant disclosed by the invention is low in apparent density, high in strength, low in turbidity, relatively low in acid solubility, and the ceramsite proppant is excellent in roundness and sphericity; and the preparation method is simple and is easy to operate.

Description

technical field

[0001] The invention relates to a ceramsite proppant, in particular to an ultra-low-density ceramsite proppant using silica as a raw material and a preparation method thereof. Background technique

[0002] Low-density ceramsite proppant has been used as a substitute for quartz sand and other types of proppants. It not only has high strength and good roundness, but more importantly, its conductivity has been greatly improved. It has been used in fracturing operations in oil and gas fields for a long time Of course, it is also widely used in fracturing operations in shale gas fields. With the breakthrough and innovation of hydraulic fracturing technology, the unprecedented demand for ultra-low-density ceramsite proppant has surfaced, especially for shale gas and coalbed methane mining.

[0003] However, at present, most of the proppant products produced by a large number of ceramsite proppant manufacturers use high-alumina bauxite with an aluminum content of 5...