Preparation method of plugging agent

Abstract

The invention discloses a preparation method of a plugging agent and belongs to the technical field of high molecular materials. The preparation method comprises the following steps: mixing a modifiedpolyvinyl alcohol mixture and borax according to the mass ratio ranging from (100 to 1) to (100 to 2); adding a mixed treatment agent which is 0.05 to 0.06 time of the modified polyvinyl alcohol mixture in mass, and a plasticizer which is 0.01 to 0.03 time of the modified polyvinyl alcohol mixture in mass; after stirring and mixing, obtaining a plugging agent blank; drying the plugging agent blank until the weight is constant; crushing to obtain a pre-treated plugging agent blank; mixing the pre-treated plugging agent blank and water-absorption resin according to the mass ratio ranging from (30 to 1) to (40 to 1); adding an additive which is 0.3 to 0.5 time of the pre-treated plugging agent blank in mass; and stirring and mixing to obtain the plugging agent. The plugging agent disclosed by the invention has excellent plugging effect and compression strength.

Description

technical field

[0001] The invention discloses a preparation method of a plugging agent, which belongs to the technical field of polymer materials. Background technique

[0002] Large cracks, karst caves, sand egg layers and formations containing dynamic water are often encountered in geological drilling. Quick-setting cement slurry or mortar plugging and bridge plugging are often used for plugging of drilling losses in these formations, but cement or mortar The slurry is easy to separate, and the slurry is often rejected due to the blockage of the slurry inlet channel, or the slurry part of the slurry diffuses too far, resulting in waste, and sometimes the treated pores are not fully filled. In addition, quick-setting cement slurry or mortar cannot be accumulated in high-speed dynamic water in formations containing dynamic water, and the water-separating property is very large, and the stability is not good so that plugging cannot be performed. During the process of bridge...