A liquid non-fluorescent lubricant for drilling

Abstract

The invention discloses a liquid non-fluorescent lubricant for well drilling. The lubricant is prepared from 50-60 parts of white oil, 6-12 parts of sulfonated palm oil, 4-8 parts of vegetable oil acid, 5-12 parts of octaphenyl polyoxyethyiene-10, 12-18 parts of sorbide oleate, 6-15 parts of chloralkane. The lubricant is prepared by taking the white oil as an oil base, the sulfonated palm oil as asynthesized anionic surfactant and the octaphenyl polyoxyethyiene-10, the sorbide oleate and the like which are taken as a nonionic surfactant are used as auxiliary materials, finally the efficient and environmentally friendly non-fluorescent lubricant capable of resisting salt is obtained, and the extreme pressure lubrication coefficient can reach 98%; the viscosity coefficient of a mud cake canreach 70%; the lubricant can be used for horizontal wells and large inclined wells, the compatibility between the lubricant and other drilling fluid materials is good, and the lubricant has good lubricating performance in the drilling fluid system; the non-fluorescent grade or the fluorescence grade is extremely low, and the lubricant can better cooperate with the specific operation of geologicallogging and the like.

Description

technical field [0001] The invention belongs to the field of drilling fluid in petroleum and natural gas and geological exploration and development, and discloses a liquid non-fluorescent lubricant for drilling. Background technique [0002] Drilling fluid lubricant is an important additive in drilling fluid. Its function is to reduce the frictional resistance between the drilling tool and the open hole wall and between the drilling tool and the metal casing, and prevent the mud pack bit, thereby increasing the drilling speed and preventing The purpose of sticking drill and reducing drill tool wear. In recent years, due to the development of drilling technology, the lubrication performance of drilling fluid has been paid more and more attention, and various oil fields have a large demand for drilling fluid lubricants. Up to now, there are many types of drilling fluid lubricants. At present, domestic liquid lubricants are mainly synthesized from mineral oil, emulsifiers and ...

AI Technical Summary

Problems solved by technology

Up to now, there are many kinds of drilling fluid lubricants. At present, domestic liquid lubricants are mainly synthesized from mineral oil, emulsifiers and some auxiliary agents, but there are many shortcomings: ①Single lubricating performance, which only serves to reduce drilling tools and casings. The friction between the pipe and well walls, or only to reduce the friction between the drilling tool and the open hole wall, there are few lubricants with both lubricating functions; After a period of time, the lubricant decomposes, the lubricating ability is greatly reduced, and it is easy to foam; ③The fluorescence level is high, which seriously interferes with mud logging and is not convenient for use in well exploration

Since the emulsified oil cannot form an effective adsorption on the mud cake, it is difficult to meet the requirements of the mud cake's adhesion and lubrication ability

Extreme pressure lubricants are mainly oil products added with emulsifiers and extreme pressure additives. Although they have achieved the ultimate in extreme pressure lubrication, their mud cake adhesion and lubricity are the same as the emulsified oils mentioned above. Effective adsorption on the mud cake, so that the adhesion and lubrication ability of the mud cake cannot meet the requirements