A microemulsion type lubricant used for a drilling fluid and a preparing method thereof

Abstract

The invention relates to a microemulsion type lubricant used for a drilling fluid and a preparing method thereof. The lubricant includes mineral oil or refined gutter oil, a surfactant, an inorganic salt, n-butanol and water. The method includes firstly adding water into a reaction kettle, slowly adding the surfactant into the reaction kettle with the stirring speed being 2000-3000 r / min; after the water and the surfactant are fully mixed, slowly adding the inorganic salt; after the inorganic salt is fully dissolved, adding the n-butanol and the mineral oil or refined gutter oil; and allowing the mixture to stand for 5-10 h. The lubricant and the method are advantageous in that industrial production of the lubricant can be achieved and the environment protection problem of the gutter oil is solved; the lubricant has good compatibleness with a water-based drilling fluid, has low influences on rheological properties of the drilling fluid, and can effectively reduce the frictional resistance coefficient and the mud cake adhesion coefficient; and by adding the lubricant into the drilling fluid, the mud cake adhesion coefficient can be effectively reduced. Experiment measurement shows that the highest reduction rate of the mud cake adhesion coefficient is 52.3%.

Description

technical field

[0001] The invention relates to a microemulsion lubricant for drilling fluid in the field of chemical additives for drilling engineering, in particular to a microemulsion lubricant with stable thermodynamic performance for water-based drilling fluid and a preparation method thereof. Background technique

[0002] Water-based drilling fluid is the most widely used type of drilling fluid, and has always occupied a dominant position in actual field applications. However, in the construction process of horizontal wells and highly deviated wells, its friction coefficient is difficult to control, so it is necessary to develop efficient Lubricants for stable water-based drilling fluids are necessary.

[0003] At present, a lot of research work has been done on improving the lubricity of drilling fluids in China, but there is a lack of research on microemulsion lubricants with thermodynamic stability systems that can be widely used in a wide temperature range. In "Re...