Elastic-plastic plugging particle for oil-based drilling fluid and preparation method of elastic-plastic plugging particle

Abstract

The invention discloses an elastic-plastic plugging particle for oil-based drilling fluid. The inner core of the elastic-plastic plugging particle is an elastic-plastic rubber particle, and the shell of the elastic-plastic plugging particle is coated with inert nanoparticles. Meanwhile, the invention further provides a preparation method of the elastic-plastic plugging particles for the oil-based drilling fluid. The preparation method comprises the steps of selecting the rubber particles, cleaning, wetting the surfaces, performing ultrasonic vibration spraying and the like. Under the condition of temperature or pressure, the rubber coated with the inert nano-particles can generate elastic deformation, the aperture plugging effect is good, and due to the fact that the shell is coated with the inert particles, the rubber cannot be dissolved in an oil phase, and the rubber still has good elastic deformation capacity and plugging performance under the condition of long-time high-temperature and high-pressure soaking in oil-based drilling fluid.

Description

technical field [0001] The invention relates to an elastic-plastic plugging particle for oil-based drilling fluid and a preparation method thereof, in particular to a plugging material with good elastic-plastic performance for oil-based drilling fluid. Background technique [0002] In recent years, with the progress of oil and gas exploration and development, the number of deep wells and wells in complex formations has gradually increased; various complex accidents have occurred frequently during the drilling construction process, especially the problem of lost circulation. The number of lost wells, the amount of lost wells, and the lost time are all high, and the plugging effect is not ideal, which not only causes huge economic losses, but also greatly delays the process of exploration and development. [0003] At present, the commonly used plugging materials mainly include bridging plugging materials, high water loss plugging materials, temporary plugging materials to prot...

AI Technical Summary

Problems solved by technology

In the current shale oil and gas development process, oil-based drilling fluid is usually used. Due to the special geological structure and lithological development characteristics of shale formations, lost circulation often occurs, but there is currently no special oil-based drilling fluid for oil-based drilling fluid plugging Plugging materials, still use conventional water-based drilling fluid plugging materials, and some elastic plugging materials for water-based drilling fluids are oil-soluble, will dissolve in oil-based drilling fluids, do not have pressure-bearing plugging performance, and cannot be applied Oil-based drilling fluid plugging

Even oil-resistant rubber, soaked in oil-based drilling fluid for a long time, will partially dissolve, causing the rubber strength, elasticity and other properties to decline, resulting in the inability to form effective plugging or causing re-leakage during drilling

Moreover, water-based drilling fluid plugging materials are mostly hydrophilic materials, which are poorly compatible with oil-based drilling fluids, and are easily contaminated by drilling fluids, affecting the plugging effect or adversely affecting the performance of drilling fluids, resulting in complex downhole accidents

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