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Opportunity

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Opportunity
Specific Challenge

Identify and interpret fractures and bedding features in high-angle OBM well

REGION - USA / TEXAS REGION - USA / TEXAS

Oil-Based Mud

REGION - USA / TEXAS

Challenge

  • Identify and interpret fractures and bedding features in OBM, in a near-horizontal wellbore
  • Remove the risks, well time, and costs associated with running a wireline OBM imager

Solution

Engineer a drilling solution that included:

  • PixStar™ high-resolution ultrasonic imaging service to improve wellbore stability
  • Logging-while-drilling (LWD) measurements configured with a bottomhole assembly that included:
    • 4¾-inch TerraForce™ positive displacement motor
    • DGR™ dual gamma ray sensor
    • ADR™ azimuthal deep resistivitysensor

Result

  • Eccentricity-normalized, highresolution reflection amplitude images identified fractures and bed boundaries
  • Interpretation from ultrasonic images removed the need for a separate wireline run

Overview 

A near-horizontal 6 1⁄8-inch well was drilled in Texas in oil-based mud (OBM), and a PixStar™ high-resolution ultrasonic imaging service was used to assess fractures and bedding features across multiple lithologies, including chalk, shale, and limestone. The service included a bottomhole assembly (BHA) with a 4¾-inch TerraForce™ positive displacement motor, a DGR™ dual gamma ray sensor, and an ADR™ azimuthal deep resistivity sensor. Inclination was built from vertical to 87 degrees, drilling 2,965 feet (904 meters), using 9.6-ppg OBM.

Enhance reservoir understanding with high-resolution images

The high-resolution reflection amplitude images revealed fractures, bedding features, and drilling induced features, highlighting the potential use of real-time images for geosteering applications. The four-transducer design of the PixStar sensor section enables accurate assessment of tool position within the borehole, allowing an eccentricity normalization to be applied to remove the potentially detrimental effect of lateral tool motion and eccentricity on the reflection amplitude images.

By enhancing reservoir understanding through interpretation of the high-resolution images, the need for a separate wireline run, and the associated risk and cost, was removed.

The PixStar™ service was used to improve wellbore stability

PixStar™ high-resolution ultrasonic imaging service was used to assess fractures and bedding features across multiple lithologies, including chalk, shale, and limestone.

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