Study on High Temperature Resisting Drilling Fluids with High Density

A new type of drilling fluid system is designed which is treatment agent and excellent performance is an important for solving problems in deep and ultra-deep wells drilling.The deeper the well is,the higher the temperature would be.High temperature has serious effect on drilling fluids.The higher the density is,the more difficult proeperty is controlled for rheological.The drilling fluid additives are chosen,including viscosity reduction agent of high temperature calcium and salt resistant,filtration reducer,borehole stabilizers.The high temperature resisting drilling fluids are compounded,the function mechanism of the treatment agent is preliminarily analyzed,a series of the high temperature resistance(200℃) and high density(2.2g/cm3) drilling fluids are developed,and the properties of the drilling fluids are comprehensively evaluated.The results indicate that this system is steady.It can meet the needs for deep drilling.