High-temperature-resistant plugging agent capable of realizing quick-filtration, and preparation method thereof

Abstract

The invention relates to a high-temperature-resistant plugging agent capable of realizing quick-filtration, belonging to the field of auxiliary materials for petroleum drilling. The high-temperature-resistant plugging agent comprises reticular sponge, ultra-short fibers, a bridging adsorbent, ultrafine calcium carbonate, elastic graphite and water. Meanwhile, the invention also provides a preparation method of the high-temperature-resistant plugging agent. The plugging agent is prepared from a high-temperature-resistant material and clear water, and realizes rapid filtration at the position ofa leakage layer, so a plugging layer is formed, the success rate of plugging can be effectively increased, and repeated leakage is avoided. Meanwhile, the plugging agent is single in formula, does not need to be compounded of various plugging materials, simplifies a plugging construction procedure, has good temperature resistance, does not lose efficacy at high temperature, and has a good plugging effect on fracture-cavity type leakage and permeable leakage.

Description

technical field [0001] The invention relates to the field of petroleum drilling auxiliary materials, in particular to a plugging agent for drilling fluid loss and a preparation method thereof. Background technique [0002] Lost circulation is the phenomenon that various working fluids leak into the formation under the action of pressure difference during various downhole operations such as drilling, cementing and completion, testing or workover. Once lost circulation occurs, it will not only delay drilling time, lose drilling fluid, damage oil and gas layers, interfere with geological logging work, increase drilling costs, but also easily cause a series of complicated situations such as pipe sticking, blowout, and well collapse, and even lead to the scrapping of the wellbore. cause huge economic losses. At present, the commonly used plugging materials in the plugging construction are mostly permanent bridging plugging materials and chemical gel plugging materials. Chemical...

AI Technical Summary

Problems solved by technology

However, some materials have poor temperature resistance, and are prone to decomposition and failure at high temperatures, resulting in repeated leakage of the leakage layer.

At the same time, these materials have problems such as sealing the door and not being able to soak for a long time, and the plugging effect is sometimes not ideal