Schlumberger

Lateral Survey Optimization Services

Overview Library

Manage azimuthal uncertainty for precise well placement

With accurate azimuthal surveys, directional drillers can maximize the efficiency of operations by drilling close to lease lines and landing in smaller targets according to plan. WellDefined services provide lateral survey optimization of real-time measurements and answers that enable this precise well placement and verify the quality of MWD azimuthal measurements.

Azimuthal uncertainty can be significantly reduced with

  • correction and modeling for magnetic field components—main, crustal, and disturbance
  • time and depth varying reference
  • real-time diurnal correction using magnetic observatories
  • correction for drillstring interference, including BHA magnetization and BHA sag or deflection.

These corrections refine the understanding of magnetic fields and greatly reduce interference for real-time wellbore positioning without disruption of drilling operations.

Reduce the ellipsoid of uncertainty with geomagnetic referencing

Lateral survey optimization uses geomagnetic referencing services (GRS) to apply local magnetic field effects at the drillsite to magnetic directional survey data. This method reduces drilling risk with enhanced survey accuracy and reduces the errors that contribute to the positional uncertainty of the well path.

With lateral survey optimization, the ellipsoid of uncertainty (EOU) is significantly reduced to give directional drillers pinpoint accuracy. And as drillers' targets become smaller or more difficult to land in, shrinking the EOU is paramount to avoiding costly sidetracks or colliding with other wells.

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