RAT meaning in oil and gas

Resistance Array Tool

Phase segregation occurs in many wells, including those with little deviation from vertical; the lighter phases migrate to the high side of the well, the heavier phases to the low side. The Resistance Array Tool differentiates between conductive water and hydrocarbons which are non-conductive, and will detect very small, fast moving bubbles. This allows determination of the water hold-up cross-sectional profile in wellbores of any deviation from vertical to horizontal and in any flow regime. Combined with data from the Spinner Array Tool (SAT) and Capacitance Array Tool (CAT), the tool allows quantitative estimations of volumetric flow rate for each phase with a much higher degree of certainty and thus provides vital and more precise information for reservoir management.