Resin fiber, plugging agent for petroleum drilling and processing technology of plugging agent

Abstract

A resin fiber, a plugging agent for petroleum drilling and a processing technology of the plugging agent belongs to the technical field of plugging materials for petroleum drilling. The formula of the resin fiber comprises the following components of: by weight, 71-73% of cellulose, 18-20% of phenolic resin and 8-10% of terpolycyantoamino-formaldehyde resin. The plugging agent is a thermosetting sheet, its surface length is 1-5mm and its thickness is 0.5+ / -0.1mm. The petroleum drilling plugging agent prepared from the resin fiber can be inert in weak acid and alkaline environments, is stable at the high temperature of 278 DEG C and is not soluble in cold water, hot water, methanol, diethyl ether, n octanol and acetone. The plugging agent is characterized by high hardness, no swelling performance, chemical inertness and special shape. The structured thermosetting sheet can be effectively embedded into stratum cracks and part of stratum interface, thus effectively raising interface strength. Therefore, the plugging agent has a good plugging effect and has long service life.

Description

technical field [0001] The invention relates to the technical field of oil drilling plugging, in particular to a resin fiber, a plugging agent for oil drilling and a processing technology of the plugging agent. Background technique [0002] During oil drilling operations, due to the existence of cracks or pores in the formation, low formation pressure coefficient and other reasons, lost circulation occurs from time to time. At present, the plugging technology is mainly based on bridging plugging technology, in which bridging plugging materials are mainly mixed with walnut shells, fibers, mica and other conventional material particles in a certain proportion. Due to the lack of self-strength of walnut shell, fiber, mica and other plugging materials and because these plugging materials are granular, under the conditions of high temperature, high pressure and corrosion in the well, with the increase of time, the particles of conventional plugging materials are easy to Softenin...

AI Technical Summary

Problems solved by technology

Due to the lack of self-strength of walnut shell, fiber, mica and other plugging materials and because these plugging materials are granular, under the conditions of high temperature, high pressure and corrosion in the well, with the increase of time, the particles of conventional plugging materials are easy to Softening and corrosion, resulting in plugging failure or secondary leakage, which cannot fundamentally solve the problem of low formation pressure bearing capacity

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