Analysis of solid concentration profiles in particle sedimentation in directional reservoirs using the gamma-ray attenuation technique

Sedimentation of solid particles in drilling fluids poses significant challenges in directional drilling operations. This study investigates the dynamics of solid sedimentation in directional wells, considering various fluid rheologies. Experimental tests were conducted using three types of suspensions: aqueous media with calcium carbonate, aqueous media with glycerin, and aqueous media with xanthan gum, the latter two containing glass microspheres. These experiments were conducted across inclinations ranging from 0° to 60°, employing the gamma-ray attenuation technique. Results revealed that inclination intensifies the Boycott effect and alters concentration curve behaviors. Particularly, fluids with re-established gel structures exhibited accelerated sedimentation velocities, indicating the profound influence of fluid rheology on sedimentation dynamics. These findings underscore the pivotal roles of inclination and fluid rheology in governing sedimentation behavior, critical for designing directional wells and optimizing oil extraction processes. Insights from this study offer potential to mitigate operational risks, enhance drilling efficiency, and advance drilling practices for challenging environments.