Method for preparing cation type composite flocculant for treating waste drilling fluid

Abstract

The invention relates to a composite flocculant for treating waste drilling fluid generated in the petroleum drilling process, and a preparation method thereof. The preparation method comprises the following steps of: extracting gelatin with larger relative molecular mass from waste skin collagen through alkaline hydrolysis; further hydrolyzing the extracted gelatin into collagen with moderate relative molecular mass by using different hydrolytic reagents; and loading proper metal ions on the collagen by using a tanning mechanism in tanning chemistry to obtain a cation type composite flocculant, and performing flocculation on anionic waste drilling fluid. The composite flocculant prepared by the method has the advantages of low cost, simple operation, high flocculating efficiency, safety and nontoxicity for a human body and the like, and is an environment-friendly product. Meanwhile, the waste skin collagen is reutilized, waste is used to treat contamination, and secondary pollution on the environment is avoided.

Description

technical field

[0001] The invention relates to the technical field of waste drilling fluid treatment, in particular to a preparation method of a cationic composite flocculant for waste drilling fluid treatment using waste skin collagen as a matrix. Background technique

[0002] Abandoned drilling fluid, like dirty oil and sewage, is one of the three major public hazards in the production process of oil and gas fields. It is difficult to degrade in the natural state, and it accumulates around the operation area, occupying a large amount of cultivated land or grassland, causing soil compaction, land salinization, and making the occupied land lose its use value. At the same time, the waste drilling fluid accumulates and infiltrates into the subsurface water layer for a long time or flows into rivers and creeks with rainwater overflow, polluting water sources and endangering human health. With the continuous improvement of the country's environmental protection requirements, t...