Mud Removal Efficiency of Weighted Cement Spacer System

During and after drilling to the desired depth, the well completion step begins. One of the key parameters in a successful well completion is an effective cementing job. The quality of cementing job is strongly dependent on the removal of the drilling fluid, which already presents in the wellbore. Spacer fluids are used to remove the mud from the well before cementing the well. Different types of spacers are available in the oil and gas industry. When a high-pressure condition is expected along the cementing interval, high density or weighted spacers are used. Although they can resist the formation pressure by their high density, but they may have some trouble in an effective mud removal from the wellbore due to their high density and viscosity. In this paper an experimental study has been carried out to optimize the mud removal efficiency of weighted spacer systems. The experiments show that the proposed composition of the weighted spacer has a reliable removing ability, which makes it applicable for cementing operation in hostile conditions.