Fluid Identification - Cased-Hole Log Analysis and Reservoir Performance Monitoring - page 98

Fig. 7.16 The fluid sampler
tool. Courtesy Schlumberger

Tool

Air Pressure
Bleed Valve

Air

Explosive
Valve

Flow Regulator

Latch
Hydraulic
Filling Valve

Floating Piston

Sample
Entrance Port
Sample Port
Closing Piston

Transfer Valve

Manometer

The manometer is a pressure gauge. It may be used in two ways, either to provide a
continuous recording of pressure against depth or to provide a recording of pressure
versus time at some fixed point in the well. When used in the continuous logging
mode, the manometer will show a pressure gradient reflecting the density of the
fluid in the well. Changes in this gradient indicate density changes in the well fluids
and thus serve to pick up fluid entries. When used in the stationary mode, the
manometer can be used in the familiar mode of a pressure bomb. Either the well can
be shut in for a pressure buildup test, or the well can be flowed on different chokes
for a step-rate test. Figure 7.17 shows a pressure buildup test recorded with a
manometer, and Fig. 7.18 a pressure buildup plot used to interpret the data.