Method for preparing silicon-free or low-silicon acidproof ceramic fracturing propping agent

Abstract

The invention discloses a method for preparing a silicon-free or low-silicon acidproof ceramic fracturing propping agent, which comprises the following steps of: (1) preparing the following raw materials in percentage by weight: 30 to 95 percent of alumina, 5 to 70 percent of barium carbonate and 0 to 10 percent of sintering aid, wherein the sintering aid is one or more of titanium dioxide, boric acid, calcium carbonate, magnesium oxide and dolomite; (2) performing ball milling on the raw materials in the step (1) in a ball mill for 24 to 48 hours; (3) preparing the raw materials obtained in the step (2) into semi-finished product particles; and (4) sintering the semi-finished product particles obtained in the step (3) at the temperature of between 1,500 and 1,800 DEG C for 1 to 3 hours, and cooling to the room temperature. The method has simple process; the barium carbonate is decomposed at high temperature to generate barium oxide, and the barium oxide is fully reacted with alumina to generate stable barium aluminate; and the barium aluminate has strong acidproof performance and protects other components in the finished product against corrosion of acid liquor, so the acidproof performance of the finished product is greatly improved.

Description

technical field [0001] The invention relates to a preparation method of a silicon-free or low-silicon acid-resistant ceramsite fracturing proppant. Background technique [0002] Fracturing proppants are necessary special materials in fracturing operations in oil and gas fields. They are used to support rock fractures, provide high-permeability channels for oil and gas flow, maintain high conductivity, and increase oil and gas production. Acid resistance is a very important indicator of fracturing proppant, which has an important impact on fracturing effect, service life of proppant and oil and gas conductivity. At present, most domestic manufacturers use bauxite or industrial solid waste as the main raw material to produce fracturing proppant with other inorganic materials. The products produced generally contain silicon components, and these components can react with hydrofluoric acid to a certain extent. The reaction produces a series of compounds such as silicon tetraflu...

AI Technical Summary

Problems solved by technology

At present, most domestic manufacturers use bauxite or industrial solid waste as the main raw material to produce fracturing proppant with other inorganic materials. The products produced generally contain silicon components, and these components can react with hydrofluoric acid to a certain extent. reaction to produce a series of compounds such as silicon tetrafluoride, so that the acid solution penetrates into the proppant, greatly reducing its acid resistance

The oil and gas industry standard SY / T5108-2006 implemented on January 1, 2007 has reduced the acid resistance of fracturing proppants, but our investigation and testing found that the acid solubility of domestic ceramsite fracturing proppants is relatively high still more common