Compact Oil-Base Mud Microimager


Delivers high-definition, fullbore images in nonconductive muds


  • Visualizing complex structures
  • Identifying faults and fractures and their orientation
  • Determining structural dip
  • Defining crossbeds, thin beds, and net-to-gross ratio in sand-shale sequences
  • Identifying sand-shale facies and sand counts
  • Evaluating secondary porosity
  • Depth-matching, orientation and substitution of cores, structural and breakout analysis, and true vertical depth (TVD) analysis

Features and Benefits

  • Eight pads with 72 total measurement electrodes and excellent dynamic range measurement electronics provide excellent pad contact for reliable microresistivity measurements and six independent caliper readings.
  • Each pad is gimbaled, and pad pressure is selectable.
  • The unique measurement system delivers high-definition images in oil-based muds, regardless of borehole conditions that would exclude conventional tools.
  • The microimager records all high-resolution data into flash memory in the time domain, independently from the data communicated by wireline.
  • The resulting high-definition, fullbore images improve geological interpretation for confident decision making in complex reservoirs.
  • An integrated navigation package is positioned close to the pads. The microimager is fully combinable with other Compact logging tools and Assure™ conveyance for improved operational efficiency and reliability.

Tool Description

The Compact™ oil-base mud microimager (COI) provides formation images in oilbase muds (OBM) for dip and fracture detection, sedimentary structure characterization, thin-bed evaluation, facies analysis, and orientated resistivity and dipmeter computation. The excellent borehole coverage and high-resolution imaging provided by the COI enable detailed reservoir description and enhance decision making. The tool operates in any oil-, diesel-, or synthetic-based mud.

The COI consists of a memory section (MIM) and a measurement section (MOE). High-resolution, time-based data is recorded into the MIM while 3.9-in. (10-cm) depth-based data is transmitted to the surface.

The COI is compatible with Reveal 360TM image processing, a patent-pending, dynamic digital imaging technology that uses microresistivity measurements to deliver a complete 360° view.