3.7 PowerV Lock/Unlock
PowerV mode is a vertical drilling mode using Gravity Tool Face (GTF) with a tool face of 180 degrees
and a steering ratio of 100%. The result of this setting is that PowerDrive will continuously seek to drill
vertical without further input from the directional driller at surface. The tool can either be configured in
PowerV mode at the shop or downlinked to engage PowerV while drilling. When the tool is in PowerV
mode it only responds to the downlink commands given in the following table:
Disengage PowerV
To disengage PowerV mode two consecutive downlink commands are necessary. It is critical that the
time constraints are strictly followed. The image at the end of these steps shows the entire process in its
entirety.
1. After ensuring that the tool has been powered up and the correct quiet time has passed, as shown
in the following chart, send command 2-29, PowerV Unlock/Engage to the tool.
2. Stabilize the stand pipe pressure by keeping steady flow for the quiet period given in the following
table:
3. Send a fixed steering setting command to the tool (1-0 to 2-12). Note: It is critical that this downlink
is started within the range provided in the table.
When the tool disengages from PowerV mode, it engages MTF mode.
Engage PowerV
To engage PowerV mode two consecutive downlinks are necessary. Both commands are the command
2-29, PowerV Unlock/Engage. The two PowerV Unlock/Engage commands must be sent consecutively.
To engage PowerV mode, do the steps that follow:
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