Directional Drilling Services
Gyro While Drilling (GWD)
The Gyro While Drilling service provides faster, safer and more accurate drilling from offshore multi-well platforms. Historically a wireline gyro was used to take a (single) gyro shot to orient the pipe and survey the well. In between shots, the well was steered without real-time orientation, increasing the possibility that the bend housing toolface of the mudmotor could change direction and drill into a nearby well.
A GWD tool is comparable to a standard MWD tool, but the main difference is the sensor package. A gyro sensor package is unaffected by magnetic interference, caused by steel casings from nearby wells. Especially for drilling the tophole section from multi well platforms, because at this stage of the drilling, the bit is at close range to adjacent wells.
The GWD tool has the following features:
- Eliminates the need to use wireline gyros to orient or steer the drilling assemblies, which saves considerable rig time and provides for safer operations.
- Rate gyro accuracy assures precise wellbore guidance for collision avoidance and precise trajectory placement.
- Unaffected by magnetic interference, the sensors can run closer to the bit in the MWD string by eliminating the need for non-magnetic spacing collars for the gyro sensor.
- The tool's modular design allows it to be placed anywhere in the drill collar.
- The tool may be run with either positive-pulse or negative-pulse telemetry systems.
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Gyro While Drilling
