Multiphase Tracer System for Drilling Lag Time Estimation

The patent introduces particulate with distinctive visual characteristics (color changes) that enable easy identification among drill cuttings. The particulate is specifically selected or treated to have color properties that contrast with natural drill cuttings, allowing operators to easily distinguish and track the introduced particulate for accurate lag time measurement without confusion with formation materials.

The patent uses an intermediary substance (introduced particulate) that behaves consistently with the drilling fluid during stoppages. The particulate is selected to have density and flow characteristics that match the drilling fluid, ensuring it remains suspended and travels with the fluid even when drilling stops. This intermediary approach allows lag time measurement to remain accurate despite operational stoppages and cuttings settling.

The patent implements a self-service measurement system where the introduced particulate automatically tracks the drilling fluid's movement without requiring external intervention. The particulate is passively carried by the drilling fluid flow, and its arrival time at the surface automatically provides the lag time measurement. This self-service approach maintains operational simplicity while achieving high measurement accuracy, as the particulate naturally follows the fluid path and timing is recorded automatically.