Precise landing operation is critical for horizontal well placement. Conventionally, the operators rely on the real-time logging while drilling which used to confirm the markers above target formation according to offset wells correlation, combine with surface seismic data to predict the depth of target zone, optimize the trajectory plan and ensure accurate landing.

However, few offset wells information, no clear markers above target formation, poor quality seismic data, uncertainty of lateral sand body distribution and unstable disturbance layers above target zone etc. further increase the risk of landing operation.

This paper will feature the successful landing using innovative logging while drilling technology. This innovative solution reduces uncertainties of structural depth and formation properties by forecasting the formation boundaries using ultradeep resistivity measurement and upgraded inversion method. The how-to-execute of the well placement will be detailed through the description of the case encountered.

The operator has observed the outstanding result from the application of the innovative technology during landing operation:

  • Reduction of the need for pilot wells.

  • Improve the drilling efficiency by proper landing, avoid unnecessary adjustments and sidetrack.

  • Real-time detection of the target up to 20m during landing.

  • Delineation of >10m thick sand bodies up to 10m above the sand.

The successful implementation of the ultra-deep high definition reservoir mapping while drilling measurements leads to improve drilling efficiency, reduce cost and mitigate drilling risk for landing operation. In addition, the ultradeep mapping capability of the service can help delineate the reservoir profile with more accurate models and help to understand the complex subsurface conditions.

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