Schlumberger Technology Corporation

Paul A Wand

Dzevat Omeragic

Qiming Li

Jan Smits

Jean-Michel Denichou

Lawrence Chou

Peiwen Xia

James F Bristow

Ashley Bernard Johnson

John Mervyn Cook

Steven Hart

A steerable drilling system comprises a rotary drill bitsecured to a housing, a secondary rotary drill componentcarried by the housing and rotatable therewith, the second rotary drill componenthaving a gauge dimension greater than that of the rotary drill bit, and a drive arrangement operable to displace the secondary rotary drill componentrelative to the housingwhile maintaining an axisof the secondary rotary drill componentsubstantially parallel to an axisof the housing

Steerable drilling system

A method for displaying a formation model while drilling a wellbore in the formation includes operating a well logging instrument at a measurement point in the formation along a wellbore while the wellbore is being drilled. Measurement data regarding the formation are obtained from the well logging instrument. An actual orientation of a geological structure is determined from the measurement data. A trajectory of the wellbore is displayed in three dimensions as it is being drilled through the formation. While drilling the wellbore, the geological structure is displayed along the trajectory of the wellbore according to the determined actual orientation of the geological structure. The actual orientation reflects an azimuth angle of planes corresponding to the geological structure. The trajectory of the wellbore is changed in response to displaying the determined actual orientation of the geological structure relative to the trajectory.

Methods for visualizing distances between wellbore and formation boundaries

A method for displaying a formation model includes displaying a trajectory representing a three-dimensional structure of the wellbore; and displaying objects representing a bed boundary along the trajectory, wherein the objects are displayed at distances from the trajectory according to measurement data, wherein the objects are displayed in orientations reflecting azimuth angles of planes corresponding to the bed boundary.

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Cambridgeshire, United Kingdom

Paul A Wand