FIT-A Production Logging Tool

FIT-A

Fluid Identification Tool

FIT-aThe FIT-A tool is used to make logs of the simultaneous fluid mixture Density and Capacitance.  This combination of measurements allow calculation of individual holdups in three-phase oil/water/gas mixtures.  It replaces the conventional separate fluid density and capacitance tools with realty improved accuracy and range due to new sensors and simultaneous sampling on the same sample of fluid.  Correlation of the two sensor readings may be made 16 times per second to compensate for separation of the fluid phases in slug or turbulent flow.  This is not possible when the sensors are separated by a significant distance along the tools string.

Fluid Density

This new sensor uses an internal 1 mCi Ba-133 radioactive source (50 times less strong than competing tools) and super-sensitive scintillator crystal/photomultiplier tube for maximum log quality.  In many operating conditions, it is possible to log using an exempt quantity source with minimal loss of resolution.  This is a great advantage because of licensing issues and lost-in-hole concerns.

High count-rates (typically 30,000 cps) ensure statistical errors are less than 0.01 gm/cc., with averaging over 1 second intervals and minimizes the influence of NORM (Naturally Occurring Radioactive Material) radiation.

Fluid Capacitance (Dielectric Constant)

The center-sample measurement includes a simultaneous 250 Khz capacitance measurement that senses water content from 0-100%.  Unlike competing tools, there is no “saturation effect” when water holdup reaches 60-70%.

FIT-A

Fluid Identification Tool

FIT-aThe FIT-A tool is used to make logs of the simultaneous fluid mixture Density and Capacitance.  This combination of measurements allow calculation of individual holdups in three-phase oil/water/gas mixtures.  It replaces the conventional separate fluid density and capacitance tools with realty improved accuracy and range due to new sensors and simultaneous sampling on the same sample of fluid.  Correlation of the two sensor readings may be made 16 times per second to compensate for separation of the fluid phases in slug or turbulent flow.  This is not possible when the sensors are separated by a significant distance along the tools string.

Fluid Density

This new sensor uses an internal 1 mCi Ba-133 radioactive source (50 times less strong than competing tools) and super-sensitive scintillator crystal/photomultiplier tube for maximum log quality.  In many operating conditions, it is possible to log using an exempt quantity source with minimal loss of resolution.  This is a great advantage because of licensing issues and lost-in-hole concerns.

High count-rates (typically 30,000 cps) ensure statistical errors are less than 0.01 gm/cc., with averaging over 1 second intervals and minimizes the influence of NORM (Naturally Occurring Radioactive Material) radiation.

Fluid Capacitance (Dielectric Constant)

The center-sample measurement includes a simultaneous 250 Khz capacitance measurement that senses water content from 0-100%.  Unlike competing tools, there is no “saturation effect” when water holdup reaches 60-70%.

FIT-A Specifications

SensorsFluid DensityRadioactive; Nal(TI) Scintillator; Ba-133 source
Fluid Capacitance (Dielectric)250 KHz
MechanicalDiameter (OD)1 11/16”
Length (make-up)28.0”
Weight6.5 lb.
End ConnectorsGO Single Pin
MaterialTi-6Al-4V Titanium
PerformanceSensitivity/Range0-100 D.U.
0-2 gm/cc
Accuracy+/- 2 D.U. Dielectric
/- 0.02 gm/cc Density
Resolution0.1 D.U. Dielectric
0.01 gm/cc Density
EnvironmentalOperating Temperature175°C (350°F)
Survival Temperature204°C (400°F)
Max. Temperature Ramp Rate 5°F per minute
Pressure15,000 psi
Power RequirementsInput Voltage46-48 VDC, 50VDC Max.
Input Current38mA
Output SignalDigital Telemetry

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