Water-based drilling fluid plugging agent

Abstract

The invention relates to a water-based drilling fluid plugging agent. The water-based drilling fluid plugging agent comprises, by mass, 10% to 20% of fibers, 15% to 25% of walnut shells, 20% to 45% of water-absorbent polymer particles, and 40% to 55% of core-shell polymer microspheres. The water-based drilling fluid plugging agent is prepared through uniformly mixing the above raw materials in a content ratio at the normal temperature under normal pressure. The plugging agent is prepared through simple processes, and has good hydrophilicity, good suspension stability, good expansion performance and good plugging effects.

Description

technical field [0001] The invention relates to a plugging agent for water-based drilling fluid. The plugging agent for water-based drilling fluid prepared by the invention is suitable for the technical field of oil field drilling engineering. Background technique [0002] Lost circulation is a complex problem in the process of drilling, cementing, logging, and workover. It can cause drilling fluid to leak from the wellbore into the lost channel, which not only consumes a lot of mud and plugging materials, but also may cause well collapse and jamming. Drilling, blowout, and even lead to major accidents such as wellbore scrapping, resulting in huge economic losses. The plugging material used for drilling is essential in the leak prevention process of drilling, and the success rate of leak prevention and plugging in drilling directly depends on the performance of the plugging material. Therefore, it is of great significance to study the plugging materials. [0003] At presen...

AI Technical Summary

Problems solved by technology

When plugging directly with plant fibers such as cottonseed hulls, due to the inherent characteristics of these fibers: too light specific gravity, difficult to control the size, easy to knot, poor fluidity and other factors