Lubricant for drilling fluid

Abstract

The invention discloses a lubricant for drilling fluid and belongs to the technical field of chemical agents for petroleum drilling engineering. The lubricant for the drilling fluid contains the following ingredients in parts by weight: 35-90 parts of vegetable oil, 10-25 parts of synthesized ester type oily agent, 9-21 parts of emulsifier, 3-8 parts of extreme-pressure antiwear agent, 6-18 parts of organic molybdenum compound, 10-12 parts of nano metal powder, 7-15 parts of dispersant, 5-9 parts of graphite powder, 3-8 parts of antifoamer, 4-7 parts of surfactant and 4-8 parts of antioxidant. According to the lubricant for the drilling fluid, disclosed by the invention, the vegetable oil serves as a main raw material, and other additives are added as adjuvants, so that the lubricating property of the drilling fluid can be remarkably improved after the lubricant is added into the drilling fluid; and meanwhile, the lubricant has high-temperature and high-pressure resisting characteristics and antiwear and antifriction properties and is free of a mineral oil ingredient, and the additives are also free of sulfur and phosphorus, so that the lubricant is environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling engineering chemicals, in particular to a lubricant for drilling fluid. Background technique [0002] Lubricants are widely used in machining, transportation, metallurgy, coal, construction and other industries, as liquid lubricants used on various types of machinery to reduce friction and protect machinery and processed parts. Lubricants are mainly used to reduce moving parts Friction between surfaces, while cooling, sealing, anti-corrosion, anti-rust, insulation, power transmission, cleaning impurities and other functions for machinery and equipment. Although the functions of lubricants are the same, the lubricants used in different industries are different due to the different products used, so the components of the lubricants will also be different. [0003] In the oil field development industry, the lubricating performance of drilling fluid has a great influence on the drilling wo...

AI Technical Summary

Problems solved by technology

However, at present, most animal and vegetable oil lubricants do not have the characteristics of high temperature and high pressure resistance. Once they encounter high temperature and high pressure, they will degrade and reduce the lubricating performance. As a result, the lubricating performance of the drilling fluid is not enough to meet the above requirements.

At the same time, although some vegetable oil lubricants for drilling fluids have the characteristics of high temperature and high pressure resistance, they do not have good anti-wear and anti-friction properties.