Low-density ceramsite propping agent taking low-aluminum high-silicon alumyte as major raw material and preparation method thereof

Abstract

The invention belongs to the technical field of solid propping agents for an oil / gas well fracturing technology, and discloses a low-density ceramsite propping agent taking low-aluminum high-silicon alumyte as a major raw material and a preparation method thereof. The low-density ceramsite propping agent is prepared from the following raw materials in percentage by mass: 90-96 percent of alumyte, 1-4 percent of manganese ore, 0.5-2 percent of hematite, 0-2 percent of clay and 0-2 percent of dolomite, wherein the alumyte is low-aluminum high-silicon alumyte; the mass percent of Al2O3 is 50-60 percent; and the mass percent of SiO2 is 12 percent. The method comprises the following steps of: smashing raw materials respectively; mixing according to a certain mixture ratio, grinding, and performing spray granulation; and sintering at the temperature of 1,320-1,380 DEG C for 0.5-2.5 hours. Crude low-aluminum high-silicon alumyte is adopted, so that the problem of supply tension of raw materials is solved, the production cost of alumyte is reduced by about 350 yuan / ton in comparison to alumyte of which the alumina content is over 65 percent, and the propping agent has a wide development prospect; and moreover, the bulk density and apparent density indexes of the ceramsite propping agent are reduced remarkably, and the cost of well fracturing is reduced simultaneously.

Description

technical field [0001] The invention belongs to the technical field of solid proppant for oil and gas well fracturing technology, and in particular relates to a low-density ceramsite proppant using low-alumina and high-silicon bauxite as a main raw material and a preparation method thereof. Background technique [0002] In the fracturing process of oil and natural gas deep well exploitation, fracturing proppants are used to provide high-permeability channels for the circulation of oil and gas flows, maintain high conductivity, and increase oil and gas production. In my country's petroleum industry, the bulk density is generally not greater than 1.65g / cm 3 , the apparent density is not more than 3.00g / cm 3 , when the closure pressure is 52Mpa, the ceramsite proppant with a fracture rate of no more than 9.0% is called a low-density ceramsite proppant. When low-density ceramsite proppant is used as oil well fracturing to extract crude oil, it has the characteristics of less c...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of utilization of low-alumina and high-silicon bauxite, and also to solve the problem of insufficient raw materials and high production costs of low-density ceramsite proppant, the purpose of the present invention is to provide a low-alumina and high-silicon bauxite Low-density ceramsite proppant with ore as main raw material and preparation method thereof