Mount Sopris Instruments

QL40-IND

Dual Induction

Two simultaneous conductivity logs corresponding to "medium" and "deep" radii of investigation

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Description

The QL40-IND dual focused induction probe provides two simultaneous conductivity logs, corresponding to “medium” and “deep” radii of investigation into the formation. The two depths of penetration are useful in porous, permeable formations where displacement of formation fluids by drilling mud creates an “invasion zone” with different electrical properties. High stability and exceptionally wide dynamic range allow the user to carry out precise measurements of conductivity in formations with sand-clay layers and mineralised water-soaked sands. The probe can be used in water filled, dry and plastic cased boreholes. The QL40-IND is supplied as a bottom sub can be combined with other logging tools of the QL product line or can be operated as a standalone tool. It is compatible with ALT/MSI acquisition systems.

Applications

  • Indicator of permeable zones and porosity
  • Formation water salinity
  • Long-term well monitoring
  • Correlation
  • Ore identification and quality
  • Indication of hydrocarbons

Downloads

QL40-IND — Dual Induction — Two simultaneous conductivity logs corresponding to "medium" and "deep" radii of investigation

Technical Specifications

Tool

  • Diameter: 45mm (1.77”)
  • Length: 1.92m (75.78”)
  • Weight: 7kg (15.4lbs)
  • Max. Temp: 70°C (158°F)
  • Max. Pressure: 200bar (2900psi)

Sensor

Based on W&R design

  • Intercoil spacing: 50 & 80cm (20 & 31”)
  • Operating Frequency: 100kHz
  • Conductivity range: 1-3000 mS/m
  • Temperature stability: < 0.5 mS/m/10°C

Operating conditions

  • Cable type: Mono, multi-conductor, coax
  • Compatibility: Scout Pro / Opal (Scout / Bbox / Matrix)
  • Digital data transmission Telemetry: Variable baudrate telemetry according to cable length/type & surface system
  • Logging speed: 5-6m/min recommended
  • Centralisation: Decentralized
  • Borehole conditions:
    • Dry or fluid-filled borehole
    • Open or plastic cased borehole

Principle of measurement

An oscillating high-frequency magnetic field from a transmitter coil within the probe induces an alternating electrical current within the surrounding conductive formation. This current, in turn, induces voltages within receiver coils proportional to the formation conductivity. The transmitter receiver spacings determine the depth of investigation of the measurements.

Measurements features

  • Deep Induction (mS/m)
  • Medium Induction (mS/m)
  • Deep resistivity (Ohm.m)
  • Medium resistivity (Ohm.m)