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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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MWD and LWD 915<br />

Figure 4-230. Photograph of a high-temperature directional sensor with three<br />

accelerometers and three magnetometers. (Courtesy Develco [I 031.)<br />

The tool face angles are counted looking downward, clockwise positive and<br />

counterclockwise negative.<br />

We will assume a perfect accelerometer calibration line that reads 3 mA<br />

for 1 g of acceleration.<br />

Solution<br />

Tables 4-118 and 4-119 give answers to Example 1 in tabular form.<br />

Example 2: Steering Tool Measurements-Tool<br />

Face, Deviation, and Azimuth<br />

The following set of data have been recorded with a MWD directional package:<br />

Gx = -0.2 mA<br />

GY = 0.1 mA<br />

Gz = 2.99 mA<br />

Accelerometer sensitivity: 3 mA = 1 g

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