Formation testing tools are used to obtain reservoir pressure, fluid samples, flow capacity, and other downhole data. They help operators evaluate reservoir productivity and make decisions on completion, stimulation, and production planning.
A typical formation tester may include packers, valves, pressure gauges, sample chambers, flow-control devices, and downhole or surface readout systems. The tool must seal against the borehole or formation interval and control fluid flow safely during the test.
Important selection factors include well depth, temperature, pressure, formation permeability, expected fluid type, sour-service conditions, and required test duration. Elastomers, metallic materials, and pressure ratings must match the working environment.
Reliable test data depends on correct tool selection, proper calibration, pressure integrity, and controlled operating procedures. After each job, sealing elements, valves, threads, and pressure-containing parts should be inspected and maintained.
