Compact Dual Laterolog Tool

Delivers accurate formation resistivity measurements regardless of wellbore geometry in conductive-mud environments


  • Determining formation conductivity in conductive-mud environments
  • Determining water saturation (Sw)
  • Providing well-to-well correlation
  • Identifying moveable fluids and fluid contacts
  • Creating an invasion profile to indicate permeability

Features and Benefits

  • A unique electrode arrangement on the Compact dual laterolog (MDL) tool detects the Groningen effect, which enhances quality control and provides accurate, real-time, deep-resistivity readings.
  • The MDL runs with the Compact microlaterolog (MMR) pad to obtain an independent, shallower data set, which improves the accuracy of flushed-zone resistivity (Rxo) and formation resistivity (Rt) data in complex invasion profiles.
  • Data from the Compact shallow-focused electric (MFE) tool can enhance the vertical resolution of the MDL to 6 in. (0.15 m), which improves thin-bed analysis and reserve estimates.
  • The small diameter of the MDL tool facilitates deployment in wireline or memory mode to mitigate the risk of bridging events and to reduce nonproductive time.
  • The MDL is fully combinable with the Compact array induction (MAI) tool to provide a unique invasion profiling.
  • The tool runs without wireline when used with the Compact memory logging (CML) system.

Tool Description

The Weatherford Compact dual laterolog (MDL) tool provides accurate resistivity measurements in high-contrast conductive-mud environments. The MDL tool provides individually optimized deep- and shallow-penetration curves that share a common 2-ft (0.6-m) vertical resolution. The deep measurement provides the Groningen curve and detects anomalous responses when the tool approaches nonconductive formations, such as salt caps.

Optimized-electrode geometry and digital-measurement sequence control enhance performance over a wide range of mud resistivities (Rm) and hole sizes and virtually eliminate electrode-polarization effects. The voltage reference and simultaneous SP electrodes are incorporated into a stiff bridle at the top of the toolstring to optimize reliability. 




Deep and shallow resistivity, Groningen, SP

Logging speed

3,600 ft/hr (18 m/min)

Measurement range

0.1 to 40,000 ohm-m


1% of measured value


0.00075 s/m or 2% (whichever is greater)

Depth of investigation

Deep: 50.4 in. (1.27 m)
Groningen: 50.4 in. (1.27 m)
Shallow: 16.2 in. (0.41 m)

Borehole fluids

WBM, salt



Maximum outer diameter

2.25 in. (57 mm)


29.31 ft (8.93 m)

Weight (air)

109 lb (49 kg)

Maximum temperature

320°F (160°C)

Maximum pressure

15,000 psi (103 MPa)

Maximum borehole diameter

19 in. (483 mm)

Minimum borehole diameter

2.8 in. (70 mm)

Compact Dual Laterolog Tool

The Compact dual laterolog (MDL) tool provides accurate, real-time, deep-resistivity readings.

Reach out to optimize reservoir performance

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