Bridging particle containing memory metal

Abstract

The invention relates to petroleum drilling materials, and particularly relates to a bridging particle for drilling fluid loss. The bridging particle comprises a memory metal frame material, a fibrousbridging material, a filling material, a suspension dispersant, a retaining agent and the like, wherein bridging can be further filled by a fiber material and a filling material based on the reticular structure formed by the memory metal frame material, and a steady bridge plug can be formed and is resistant in fluid soaking. The bridging particle has a long-time bridging effect, and can be usedfor effectively improving the bridging success rate of fractured-vuggy loss.

Description

technical field [0001] The invention relates to petroleum drilling materials, in particular to a plugging agent for drilling fluid loss. Background technique [0002] Lost circulation refers to the leakage of various working fluids (including drilling fluid, cement slurry, completion fluid and other fluids) under the action of pressure difference during various downhole operations such as drilling, cementing and completion, testing or workover into the ground phenomenon. 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 plugging construction are mostly bridging plugging materials and chemical gel plugging materia...

AI Technical Summary

Problems solved by technology

Chemical plugging has a good plugging effect on malignant leakage, but the chemical plugging reaction is more intense, the construction is complicated, and the risk is higher

The bridging plugging material has a simple construction process and low cost, and is the most commonly used in the field. However, some hard materials such as walnut shells are often used as the skeleton material. These materials have problems such as sealing the door and cannot be soaked for a long time, and the plugging effect is sometimes not ideal.