A kind of solid lubricant and its preparation method and application

Abstract

The invention discloses a solid lubricant and its preparation method and application. The solid lubricant is prepared by mixing the following raw materials in parts by weight: 18-24 parts of dipentaerythritol, 28-32 parts of polytetramethylene glycol, and SG100 38~48 parts, 6~12 parts of thiourea. When preparing, add polytetramethylene glycol and SG100 into the mixing container, heat to 70-90°C, after the two melt into liquid, keep the temperature at 70-90°C, slowly add dipentaerythritol and thiourea under stirring condition, Stir for 1.5 to 2 hours to make it fully mixed and react, and cool to room temperature after the reaction to obtain a solid lubricant. The lubricant is in solid form, which is convenient for storage and transportation, has good lubricating performance, has a significant effect of reducing friction, can effectively improve the lubricating performance of drilling fluid, and has a low fluorescence level, does not affect geological logging, is non-toxic and harmless, and is environmentally friendly. The preparation method is simple, the conditions are mild, and the preparation cost is low.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling fluid materials, in particular to a solid lubricant and its application in oil and gas field drilling fluid. Background technique [0002] Drilling fluid lubricant is one of the main treatment agents for drilling fluid. It is mainly used to reduce the frictional resistance between the drilling tool and the pipe, and between the drilling tool and the well wall, so as to effectively avoid the occurrence of drilling accidents such as stuck pipe and improve the efficiency of drilling. efficiency. In recent years, with the emergence of complex wells such as deep wells, ultra-deep wells, directional wells and extended-reach wells, the high friction, high torque and high temperature conditions of drilling have put forward higher requirements for drilling fluid lubricants. At the same time, with strict environmental protection requirements, it is necessary to develop an efficient, gree...

AI Technical Summary

Problems solved by technology

Due to the limitation of solid size, lubricating materials such as plastic balls and glass balls are easy to be removed by solid control equipment during the drilling process, and under the extrusion or vibration of the drill pipe, the small ball particles are easy to be squeezed and deformed, and even Crushed and lost lubricating properties

Moreover, plastic pellets and glass pellets cannot be degraded in the environment for a long time, causing long-term pollution to the environment. Graphite powder may also bring dust pollution during use, etc.