Fluid Identification - Cased-Hole Log Analysis and Reservoir Performance Monitoring - page 87

Table 7.1 summarizes the fluid-typing tools available. The following devices are
discussed in this chapter:

Table 7.1 Fluid identiicatio n tools
Tool type Parameter measured Service company name

Density Pressure differential Gradiomanometer

Gamma ray absorption Fluid density tool

Vibration Densimeter

Dielectric Electrical capacitance Watercutmeter

Hydrolog

Manometer Pressure Manometer

HP quartz gauge Pressure Quartz pressure

Noise Noise frequency spectrum BAT S

Thermometer Temperature

Differential temperature
Radial temperatures

Fluid sampler PVT sample recovery Borehole fluid sampler

Gradiomanometer
Gamma ray absorption
Gamma ray back scattering
Resonators (vibrators)
Capacitance (dielectric)
Optical fluid density
Fluid resistivity
Fluid samplers
Manometers and other measurements

Gradiomanometer

The gradiomanometer tool (see Fig. 7.1 ) effectively measures the pressure
difference between two points by measuring the expansion or contraction of a metal
bellows system filled with oil. In a vertical wellbore, the pressure difference mea-
sured may be directly converted into a pressure gradient, and hence to a fluid den-
sity in grams per cubic centimeter.