Operations Manual
3. Check differential pressure on EDR chart, if a large increase is seen when going to bottom, it is likely that the flow to the turbine has been disrupted.
Steering Modes
Below is a detailed description of all D-Tech steering modes available.
Open Loop Modes – Open loop steering modes are used to define where the user determines how much input is required to achieve desired steering. This is done by setting a steering percentage and targeted toolface. The D-Tech tool has 2 open loop modes for the user. In the open loop modes, the user will determine a steering percentage required to meet the directional requirement. Magnetic Toolface (MTF) – In MTF mode the user will select a desired toolface target from 0-345 degrees in 15-degree increments and a command percentage from 20-100% in 20% increments. This is the recommended mode to kick off from vertical. However, the tool is not internally corrected for magnetic declination; this should be noted when working in high declination areas and the targeted toolface will need to be accounted for. Gravity Toolface (GTF) – In GTF mode the user will select a targeted toolface from 0 to +/- 180 degree in 15-degree and a command percentage from 20-100% in 20% increments. This is the recommended mode when steering above 20 degrees inclinations and MTF should be used up to 20 degrees inclination. Demand Percentage – Demand percentage is used to tell the tool how often it should steer not the force of the pads. Demand is based on a 5-minute drilling cycle, if you set the tool for 40% demand the tool will steer for 2 minutes out of the 5-minute cycle and the rest of the time the tool will function in neutral. Closed Loop Modes – A closed loop mode operates independent of user input, this is best described as goal seeking . The user will set a targeted goal for the tool to achieve where the tool will determine toolface placement and steering percentage to achieve the set target/goal. These modes are your inclination and azimuth seeking modes.
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