Composite flocculating agent for flocculation treatment of fracturing flow-back fluid and preparation method thereof

Abstract

The invention provides a composite flocculating agent for flocculation treatment of a fracturing flow-back fluid and a preparation method thereof. The composite flocculating agent comprises the following raw materials: water glass, a coupling agent, an acrylamide monomer, a cationic monomer, a crosslinking agent and an initiating agent, wherein according to amounts of substances, the ratio of water glass to the acrylamide monomer is 1 to (1-10), and the ratio of the acrylamide monomer to the cationic monomer is (0.5-10) to 1; and according to mass, the amount of a silane coupling agent KH570 accounts for 0.005-0.05% of that of water glass, the amount of the crosslinking agent accounts for 0.005-0.1% of that of the acrylamide monomer, and the amount of the initiating agent accounts for 0.005-0.1% of the total mass of the acrylamide monomer and the cationic monomer. The preparation method disclosed by the invention is used for preparing the SiO2-cationic polyacrylamide composite flocculating agent by adopting an aqueous solution polymerization process, does not introduce an organic solvent, cannot cause pollution to the environment, and is simple in production process, mild in reaction and easy to perform; and the flocculating agent disclosed by the invention has a good flocculation treatment effect in a flocculation treatment process of a shale gas fracturing flow-back fluid.

Description

technical field [0001] The invention relates to a composite flocculant for flocculation treatment of shale gas fracturing flowback fluid and a preparation method thereof, belonging to the technical field of chemical preparations for oil field sewage treatment. Background technique [0002] At present, the key issues in the on-site treatment of shale gas fracturing flowback fluid are the improvement and optimization of flocculation technology and the development and application of high-efficiency flocculants. The coagulation process has many advantages such as good treatment effect and low treatment cost, and if this process is organically combined with other treatment processes, it will greatly improve production efficiency and effectively improve and reduce environmental hazards. High-efficiency flocculants play a key role in the coagulation process. Selecting a suitable flocculant to prepare an aqueous solution and adding it to the fracturing flowback fluid will generate a...

AI Technical Summary

Problems solved by technology

[0005] Although a single flocculant can achieve a certain effect under certain conditions, with the improvement of environmental protection requirements, these flocculants can no longer meet the requirements of various types of wastewater treatment. In order to further improve the performance of flocculants, many studies will be different. The flocculant is compounded to achieve good flocculation effect and degradation performance, so it has been valued by the majority of researchers.