Introduction
The most accurate pressure test is a direct measurement of pressure at the perforated interval. This can be accomplished with a pressure transducer lowered on wireline or a transmitter installed in the tubing string. In some cases, usually for offshore wells, a pressure transmitter is installed downhole permanently, and pressure is recorded continuously. The type of
Static Gradient
The simplest wireline pressure test is the static gradient (SG) test. An example SG is provided below.
In a SG test, pressures are recorded at several different depths as the tool is lowered into the well. The density of the fluids in the wellbore can then be determined.