The TerraVici RSS can be sent a command at any time to enter Vertical Hold mode. In this mode the tool will automatically detect any deviation from vertical and steer to the low side of the wellbore to correct the deviation. This allows the driller to drill ahead with parameters optimized for ROP, there is no need to slow down or feather Weight on Bit through problematic zones.
When requested the Rotary Steerable can be set up in Vertical Hold mode when it leaves the shop. This allows the tool to be used at the rig site without any intervention from the surface crew. The tool can be picked up, run in hole and will seek vertical immediately once drilling commences.
Utilizing the RSS in vertical sections also avoids costly directional correction runs. Vertical well sections can be drilled from shoe to TD in the least amount of time possible.
Like Vertical Hold Mode, the RSS can be sent a command to hold any inclination. The tool will automatically detect a drop or build in the well and will steer back to the desired inclination. This is especially useful in slant, S-well, and horizontal wells where there are long intervals at a constant inclination.
The target inclination can be changed at any time, in increments as small as .25 degrees, in order to follow the well plan or respond geo steering information in the pay zone.
While in Inclination Hold mode, the tool can also execute azimuth turns as well. This allows for complex 3D well profiles to be drilled accurately.
Since the TerraVici rotary steerable is internally steered, all external components of the RSS rotate with the drill string. This maximizes hole cleaning and reduces the chances of becoming differentially or mechanically stuck.
Internal steering allows the RSS to point bit regardless of the formation hardness. The tool will steer in both hard and soft formations.
All TerraVici Rotary Steerable tools offer exceptional Dog Leg Severity capability. The tool can be used to drill the curve section of a horizontal well and in many cases offers a substantial time savings over a conventional bent housing mud motor.
Once the curve has been landed, then same tool can be used to drill out into the lateral section. This allows for the vertical, curve and lateral sections to be drilled using one Bottom Hole Assembly.
There is no specialized surface equipment required to send commands to the RSS. All commands are sent by flow rate changes using the rig mud pumps. Downlinks can be sent while drilling on bottom. A Downlink confirmation receipt is sent from the tool to surface confirming acceptance of the each downlink and the new settings.
- Through the Real Time link to the surface, the RSS can communicate:
- Target Toolface and Toolface Accuracy
- Bit Speed
- Stick Slip Magnitude and Frequency
- Rotating Inclination
- Downhole Shock and Vibration
- RSS Health
- Downlink Confirmation
Virtually all BHA equipment is compatible with the RSS including but not limited to:
- MWD Tools
- LWD Tools
- Hole Enlarging Reamers
- Roller Reamers
- String Stabilizers
- Shock Subs
- Downhole Filters
The RSS has been engineered with maximized 3rd party equipment compatibility in mind. The uphole end of the RSS has a industry standard 8-pin rotatable electrical connector housed in a 1 7/8″ pressure barrel . It has been adapted to communicate to numerous M/LWD systems and downhole wireless communication devices.
Electrical power for the RSS is provided by a turbine generator. This means there are no lithium batteries to handle at the wellsite, and there is not a practical limit to the amount of time that the tool can be run downhole.
Auxiliary electrical power is available to a hard connected M/LWD string above the tool. This reduces battery consumption, which is one of the highest costs in operating an M/LWD string.
Since the RSS is a true point the bit system it is compatible with both Fixed Cutter and Roller Cone drill bits. The tool drills rock with the face of the bit meaning that aggressive, active gauges are not needed to help the tool steer. As a result the bit typically stays in gauge for the entire run and bit wear is minimized.
Due to the smooth nature of the borehole the RSS creates, back reaming operations are often unnecessary. This eliminates the need for up drill and gauge cutters , allowing for simpler, more cost effective bits to be run.