Leak-stopping agent for oil-base drilling fluid

Abstract

A related leak-stopping agent for an oil-base drilling fluid comprises the following compositions in percent by weight: 15-20% of fiber, 10-25% of juglans regia vshell, 20-40% of an oil-absorptin polymer particle, and 40-60% of an oil-base juglans-regia-shell expanding plugging agent. The leak-stopping agent for the oil-base drilling fluid is obtained by uniformly mixing the above raw materials. The leak-stopping agent is simple in preparation technology, good in lipophilicity, good in suspension stability and expanding performance, and good in plugging effect.

Description

technical field [0001] The invention relates to a drilling fluid treatment agent, in particular to a plugging agent for oil-based drilling fluid. Background technique [0002] With the development of domestic shale gas wells, horizontal wells, and extended-reach wells, the utilization rate of oil-based drilling fluids is increasing year by year. However, the preparation cost of oil-based drilling fluid is much higher than that of water-based drilling fluid. If complex fractured formations are drilled, a large amount of oil-based drilling fluid will be lost, which not only affects the drilling efficiency, but also causes immeasurable economic losses. At present, the way to deal with lost circulation in oil-based drilling fluids is to add plugging materials, but these plugging materials are basically developed for water-based drilling fluid systems, and the application of water-based lost circulation agents in oil-based drilling fluid systems exists Poor dispersibility, weak ...

AI Technical Summary

Problems solved by technology

However, the preparation cost of oil-based drilling fluid is much higher than that of water-based drilling fluid. If drilling in complex fractured formations, a large amount of oil-based drilling fluid will be lost, which will not only affect the drilling efficiency, but also cause immeasurable economic losses.

At present, the way to deal with lost circulation in oil-based drilling fluids is to add plugging materials, but these plugging materials are basically developed for water-based drilling fluid systems, and the application of water-based lost circulation agents in oil-based drilling fluid systems exists Poor dispersibility, weak strength when encountering oil, easy to break when shearing, no oil resistance, and insufficient compatibility with other oil-based drilling fluid treatment agents, which affects the plugging effect in field applications to a certain extent

Images