دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: (DST) the conventional method of formation testing. The basic drill stem test tool consists of a packer or packers, valves or ports that may be opened and closed from the surface, and two or more pressure-recording devices. The tool is lowered on the drill string to the zone to be tested. The packer or packers are set to isolate the zone from the drilling fluid column. The valves or ports are then opened to allow for formation flow while the recorders chart static pressures. A sampling chamber traps clean formation fluids at the end of the test. Analysis of the pressure charts is an important part of formation testing.

n: during drilling or affter well completation ,lower the drillstem tester into the layer to make the pressure build up test so as to eatimate the layers and the fluid parameters