The liquid lubricant used for drilling fluid is mainly used to reduce the flow resistance of drilling fluid and filter cake friction coefficient, reduce the bit torque well to improve its water horsepower, to prevent sticking treatment agent.
Most of the liquid lubricants for drilling fluid are made of animal and plant oil derivatives, synthetic compounds and surfactants.Liquid lubricants for drilling fluid mostly have very good lubrication;There is another type which is solid lubricants, such as graphite, Glass Microsphere, plastic Microsphere etc., which are specially used to reduce the torque of drill pipe. Some lubricants have the function of anti - drilling mud coating, also known as anti - mud coating agent.
Liquid lubricants and treatment agents for drilling fluids at home and abroad have experienced continuous progress and improvement. Their development is closely related to the development of petroleum exploration and development of drilling engineering. Every progress is based on the premise of needs, and it is a process of improving the understanding of the performance of liquid lubricants for drilling fluids. The bentonite content control level is the fundamental symbol in the development process of the liquid lubricant used for drilling fluid ,from dispersion (coarse and fine dispersion) to non-dispersion, and then to low clay phase or even no clay phase. The liquid lubricant used for drilling fluid has gradually moved to scientific . Due to different habits, complexity and local materials, the technical level of liquid lubricants for drilling fluids in different regions at home and abroad is also different, but all of them are developing in the direction of safe, high quality and green environment protection
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