Study on the Dynamic Prediction Method of ECD in Horizontal Well Drilling

摘要

Well pressure and ECD control is one of the most important things in horizontal well drilling. This paper establish horizontal borehole pressure and ECD management considered seaside, temperature, drill pipe eccentric, drill pipe rotation and cutting bed though research horizontal well drilling. Sensitive factors like drill fluid density, drill fluid viscosity and so on has been found though analyzed the sensitive of ECD to drilling parameter. ECD real-time correction with different condition has been proposed though dimensionless comparison of factors. The first correction based on measured export parameters on the ground and use pump pressure to verify the correction. The second correction use trial method after compared pressure curve measured in down hole with model curve, verify the correction by pattern contrast. Precise ECD data can obtained use real-time correction mentioned to correct ECD management, ensure drilling safety in narrow density window.