Drill challenging S-shaped well trajectory
An operator in Russia planned to drill a challenging S-shaped,
extended-reach well with a drop from 86°to 55° inclination. To achieve
this, the operator had to minimize tortuosity and maintain trajectory while
drilling through hard stringers at a drop rate of 2°/30 m.
In addition, while drilling the operator needed to capture in-depth
formation data, including density and caliper measurements for the geomechanics
mud-weight window, pinpoint the correct liner setting depth, and calculate
equivalent circulating density (ECD). Accuracy was critical because of the
risks of losses and to guide completion design. Setting the liner at the right
depth would maximize the success of future fluid production.
Use PowerDrive Xcel RSS to optimize steering
Schlumberger recommended drilling with the recently introduced
PowerDrive Xcel RSS with real-time gamma ray because the point-the-bit
technology performs reliably in high-profile directional drilling operations.
It also senses magnetic and inertial stick/slip as well as shock and vibration
on three axes.
Given anticipated hard stringers and the S-shaped extended reach
drilling, the PowerDrive Xcell RSS will provide the operator with crucial
monitoring for optimal placement of the 94/8-in liner, while the advanced
directional control will enable confident drilling of the complex section
without compromising LWD data acquisition.
Drilled and logged section in one run
The PowerDrive Xcel RSS drilled the 2,000-m interval from shoe to shoe
in just one run with little or no shock and vibration. The high-quality,
real-time data captured by the BHA enabled the drilling team to land the well
at the planned 55° inclination and determine the liner setting depth
without any additional logging runs. The azimuthal hold feature of the
PowerDrive Xcel RSS minimized tortuosity and enabled the operator to float the
liner to total depth.