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Microstrip Resonator for Wellbore Imaging in Oil-based Mud

Conventional wellbore micro-resistivity imaging techniques are based on conduction of electric currents. These techniques only work in conductive water-based mud (WBM) and are unable to generate meaningful images in nonconductive oil-based mud (OBM). This technology is a novel design of a micro-resistivity imaging sensor based on microstrip resonator. The resonator can be easily integrated into bottom hole assembly of the drill string to provide imaging while drilling and will be able to provide borehole images in both WBM and OBM. It allows standoff up to 0.5 inch between the sensor and borehole wall so it can be used for both logging while drilling (LWD) and wireline logging.

Applications

  • Wellbore imaging in oilfield well logging
  • Pigging systems on oil pipelines

Problems Addressed

  • Micro-resistivity wellbore imaging is extremely difficult when OBM is used as drilling fluid
  • Four-terminal based sensors can only be used for wireline logging

Competitive Advantages

  • Small in size at 1”x1”x0.1”
  • Higher resolution as much as 0.1 inch under most circumstances
  • Allows standoff of up to 0.5 inch
  • Flexible enough to work in both WBM and OBM and implemented to LWD and wireline logging tools

Patents

  • Provisional Patent application filed