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GRT

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GRT  

The GRT is an advanced imaging laterolog device, incorporating four independent receiving electrodes to create an azimuthally-sensitive resistivity measurement. This capability allows the GRT to detect a nearby bed, determine whether it is conductive or resistive, and ascertain its direction and distance.

Unlike competing tools, it is not necessary to rotate the GRT to obtain directionally-sensitive resistivity measurements. Directional resistivity data from the GRT can be graphically presented on a surface display (patents pending) in an enhanced version of the familiar compass rose drillers display typically employed in directional drilling. A continuously-updated borehole image showing the distance and direction to conductive/resistive anomalies enables the operator to intelligently direct the drilling process, without having to study resistivity logs.

Aplications

  • Directional, horizontal and re-entry wells
  • Logging While Drilling (LWD), gamma, resistivity, temperature, vibration.
  • Logging While Tripping.

Features & Benefits

  • Operating temperature (150ºC) and pressure (20,000psi)
  • MWD Wireline retrievable design (minimum 2.25in I.D.)
  • Available real-time gamma measurements for LWD (focused gamma available) Downlink capability for selectable operating modes Proven software and firmware for efficient decoding.
  • Adaptable tool configurations and programming flexibility.
  

Specifications

Types of Measurement LWD Average Resistivity Log (ResB), and Real-time Resistivity Vector: Magnitude (ResV) + Angle (ResA), and Gamma-ray or Focused Gamma.
Average Resistivity 0.2 to 20,000 Ohn., +/-10% (worst case), +/-1.5% (if borehole is on gauge)
Thin Bed Resolution 17 cm / 6.75”
Maximum Operating Temperature 150ºC / 300ºF
Maximum Pressure 1400 Bar / 20,000 PSI
Detection Distance for Parallel Rock Formation Boundary >1 meter / 40 “ with >10:1 resistivity contrast
Depth of Investigation (Invasion Tolerance) 0.64 meter / 25” diameter @ 50% point on PGF curve
Internal Memory 400 hour (16.7 day) log including all resistivity, gamma and diagnostic data. Data are recorded every 4 seconds and can be downloaded through a high-speed port).
Power Supply Lithium 28VDC/3amp (21VDC/5amp available)
Battery Life 200 Hrs with one 28.8 VDC Battery Pack (50% duty cycle)
Serial ASCII +5VDC, 9600 Baud