Omega Propagation Resistivity Tool

Omega Propagation Resistivity Tool
Omega Propagation Resistivity Tool

Specifications

Collar O.D. :
3.75”, 4.75”, 6.75” and 8”
Tool Length :
138.31” (3.513 m)
Collar Length :
130.5’’(331cm)
Max Dogleg :
15°/30 m (100ft)
Max Operating Temp :
175 °C(347°F)
Max Operating Pressure :
20,000 psi
Max Sand Content :
0.50%
Recorder Capacity :
40000 Records
Power Source :
4-28V Lithium Batteries 25AH
Input Voltage Range :
18.5 - 30 VDC

Description

The patented Omega resistivity tool uses propagating radio frequency (RF) to determine the resistivity of the surrounding formation. The probe lands into a slotted collar, which allows the RF to pass into the formation.

These readings are fully compensated against borehole effects by combining the results from two symmetrically placed transmitters. Attenuation and phase shift resistivity are measured at 400 kHz and 2 MHz.

Measurements can be made in oil- and water-based mud. The tool is a fully retrievable configuration, and makes it the better choice over collar-mounted resistivity tools.

 

Features & Benefits

  • Four depths of investigation.
  • Memory Recordable Measurements.
  • Fully Retrievable.
  • A single tool can operate in multiple collar sizes, thus reducing cost.
  • Modular design allows adaptive bit-to-sensor placement.
  • Works in water/oil based drilling muds.
  • Can be used in conjunction with other Q-bus or CAN-bus based MWD tools.

 

Applications

  • Oil-water contact detection.
  • Bed boundary mapping.
  • Logging while tripping.
  • MAD PASS (Measurement after drilling)

 

Sensor Measurements

The Omega has a vibration sensor that can measure the following:

  • Peak Z Vibration (raw)
  • Peak X-Y Vibration (raw)
  • Z Vibration (raw)
  • X-Y Vibration (raw)
  • Z Vibration Flag
  • Z Shock (Counts)
  • X-Y Shock Flag
  • X-Y Vibration Flag
  • Z Shock Flag

 

Depth of Investigation

MeasurementRadius of Investigation
1 Ω · m		Radius of Investigation
10 Ω · m
2 MHz Phase Shift18″ (45.5 cm)28″ (71.0 cm)
400 kHz Phase Shift24″ (62.5 cm)37″ (94.0 cm)
2 MHz Attenuation30″ (72.75 cm)48″ (122.0 cm)
400 kHz Attenuation41″ (104.5 cm)76″ (193.0 cm)

Resistivity depth of investigation is the radius at which the integrated geometrical factor reaches 0.5 in the specified formation resistivity.

 

Vertical Resolution

MeasurementVertical Resolution
1 Ω · m		Vertical Resolution
10 Ω · m
2 MHz Phase Shift12″ (30.5 cm)21″ (53.5 cm)
400 kHz Phase Shift16″ (40.5 cm)28″ (71.0 cm)
2 MHz Attenuation22″ (56.0 cm)40″ (102.0 cm)
400 kHz Attenuation33″ (84.0 cm)58″ (147.0 cm)

Vertical Resolution is the width at 50% of the vertical response function.

 

Resistivity Range and Precision

MeasurementCenter Resistivity± % Variation
2 MHz Phase Shift150 Ω · m1.0
2 MHz Phase Shift400 Ω · m2.6
2 MHz Phase Shift1000 Ω · m13
400 kHz Phase Shift100 Ω · m2.9
400 kHz Phase Shift150 Ω · m4.2
400 kHz Phase Shift400 Ω · m11
2 MHz Attenuation10 Ω · m0.5
2 MHz Attenuation150 Ω · m5.5
400 kHz Attenuation1 Ω · m0.2
400 kHz Attenuation10 Ω · m1.7
400 kHz Attenuation25 Ω · m10

 

Ideal Operating Range

MeasurementIdeal Operating Range
2 MHz Phase Shift0.4 to 2000 Ω · m
400 kHz Phase Shift0.1 to 1000 Ω · m
2 MHz Attenuation0.4 to 200 Ω · m
400 kHz Attenuation0.1 to 50 Ω · m

 

 

  •  10933A - 166A, Edmonton, NW,
    Alberta, T5P 3V4, Canada
  •  Call us:
    +1 780 238 1478
  •  Email us:
    office@epcosolutions.net
MWD services and Oil & gas well drilling equipment and spare parts supply.

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