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WellCAD Basics - Advanced Logic Technology

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Note:<br />

1.5.12.1 Azimuth and Tilt<br />

BOOK 1 - WELLCAD BASICS - 147<br />

Azimuth is the borehole azimuth, the angle from magnetic north to the horizontal<br />

projection of the tool (borehole) axis (if we assume that tool axis and borehole axis<br />

can be seen as parallel).<br />

RBR is the angle from the high side of the tool (borehole) to the position on the<br />

tool where the first data point of each scanned circle is recorded.<br />

Tilt is the inclination of the well measured from the vertical axis (TVD) in degree<br />

(Tilt = 0� vertical well, Tilt = 90� horizontal well).<br />

This process uses the magnetometer and accelerometer (inclinometer) data recorded<br />

by the orientation device to compute an Azimuth, RBR (High-Side) and Tilt<br />

channel. The input data must be calibrated and with the following units:<br />

- Magnetometer in [�T]<br />

- Accelerometer in [g]<br />

- Inclinometer in [deg]<br />

Select the Azimuth And Tilt option from the Process > Common > Borehole<br />

Deviation menu. The following dialog box pops up.<br />

Set the input channels for azimuth and tilt computation

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