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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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916 Drilling and Well Completions<br />

Hx = 0.1 G<br />

HY = -0.2 G<br />

Hz = 0.484 G<br />

Earth magnetic field amplitude: 0.52 G<br />

Earth magnetic field inclination/vertical: 32"<br />

High Side<br />

I<br />

Figure 4-231. Vector diagram for the tool-face determination.<br />

Table 4-118<br />

Accelerometer Output for 0" Tool-Face Angle and Various Tool-Face Angles<br />

Hole AXIS x Axis y Axis z<br />

Devlation (") Tool Face (") (mA) (mA) (mA)<br />

0 0 0.00 0.00 3.00<br />

15 0 0.78 0.00 2.90<br />

30 0 1.50 0.00 2.60<br />

45 0 2.12 0.00 2.12<br />

60 0 2.60 0.00 1.50<br />

75 0 2.90 0.00 0.78<br />

90 0 3.00 0.00 0.00

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