1. n. [Drilling Fluids]
A chemical or isotopic marker that is uniformly distributed in the continuous phase of a drilling, coring, drill-in or completion fluid and used to later identify the filtrate in cores or in fluids sampled from permeable strata. A tracer must become a part of the filtrate, remaining in true solution and moving with the filtrate into permeable zones. It must not be a component in the strata that is expected to migrate, be adsorbed on clays, or degraded. It should be measurable in trace amounts and safe to handle.
Examples of filtrate tracers include
See: bland coring fluid, completion fluid, continuous phase, core, coring fluid, drill-in fluid, dynamic filtration, low-pressure, low-temperature filtration test, mud tracer, static filtration