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DeploymentBorehole
Log NameTEMP
Math Symbol

LaTeX Math Inline
bodyT

Measured PropertyBorehole fluid temperature
Sensor TypePlatinum resistor
Units
SI°C
Oil Metric°C
Oil Field°F = 9/5 T [°C] + 32


Image Added


Applications



Sample Logs




Tool Schematic




Mathematical Model


Mathematical model of fluid temperature is very complex and described in following papers:

Downhole logging sensor measuring the natural gamma emission from surroundings rocks

Log Name = GR

Measured property = gamma quants per second

SIOil MetricOil FieldR/s μR/hr  = 2.8 ·10-10 R/s GAPI = 4.2* ·10-10 R/s = 1.5* μR/hr

 * – for scintillation detectors

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Scope of Applicability

Depth Matching between cased-hole and open-hole logs
Pick up radioactive anomalies caused by saline water invasion 
  • Pick up radioactive anomalies caused by water invasion or radioactive tracers 

    • Mathematical Model

    LaTeX Math Block
    alignmentleft
    GR = (1-\phi_e) \cdot GR_{m}  + \phi_e \cdot s_w \cdot GR_w

    where 

    LaTeX Math Inline
    bodyGR_w
     is natural gamma radioactivity of formation water and 
    LaTeX Math Inline
    bodyGR_m
      is natural gamma radioactivity of rocks:

    LaTeX Math Block
    alignmentleft
    GR_m = \sum_i GR_{mi}
    where 
    LaTeX Math Inline
    bodyGR_{mi}
     natural gamma radioactivity of i-th mineral.