LUBRICANT FOR DRILLING AND DRILL-IN FLUIDS

摘要

A lubricant composition containing a vegetable oil, and at least two nonionic surfactants. The vegetable oil may be castor oil, and the nonionic surfactants may include sorbitan esters and polyethoxylated sorbitan esters. Also provided is a wellbore fluid containing a base fluid and a lubricant containing vegetable oil and at least one nonionic surfactant. Methods of introducing the lubricant composition and wellbore fluids containing the lubricant composition into a subterranean formation zone are also provided.