Considerations of Cementing Directional Wells in High-Pressure, High-Temperature Conditions

The high-pressure, high-temperature cement systems usually contain high concentration of solid materials to adjust their properties and meet the essential requirements of these conditions. However the presence of these solid materials limit their application for construction of directional wells, as the speed of solid material precipitation will increase by increasing the inclination angle. In this work using experimental methods the stability of specially developed cement systems have been investigated. New additives have been applied to get stable cements. Also to ensure that the problem of sedimentation instability will not occur, the filtration test has been carried out at elevated temperatures and pressures. The developed system shows high degree of sedimentation stability.