Evaluation of Drag Reduction of Commonly Used Polymers in Drilling Fluid

With the ongoing advancement in the drilling and development of unconventional oil and gas resources in deep water and specialized structural wells, accurately controlling wellbore pressure has become increasingly challenging. This difficulty heightens the risk of severe downhole incidents, including pump jumping, lost circulation, well collapse, sticking, well kicks, and even blowouts. This paper addresses the issue of fine regulation of dynamic wellbore fluid pressure (Equivalent Circulating Density, ECD) by examining the microscopic mechanisms of drag reduction within drilling fluid flow. We analyze the drag reduction effects of various typical additives and their relationships with parameters such as test solution concentration, flow rate, temperature, and rheology. This analysis is conducted using a newly developed simulation experimental device designed to assess drilling fluid flow pressure consumption, thereby offering a novel technical approach for the precise control of drilling fluid pressure.