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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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MWD and LWD 939<br />

Retrievable Tools. Retrievable MWD tools similar to the steering tools are<br />

available from several service companies. They are generally battery powered<br />

and generate coded positive pressure mud pulses or continuous pressure waves.<br />

The lower part of the tool has a mule shoe that engages in a sub for orientation.<br />

Currently, tools are available for measuring directional parameters and gamma<br />

rays. A typical retrievable tool is shown in Figure 4-251.<br />

Nonretrievable sleeve<br />

Impeller<br />

Rotor<br />

Stator<br />

Centralizer<br />

Electronics module<br />

Gamma Ray<br />

Battery module<br />

Pony Monel<br />

UBHO sub<br />

Bottom landing assembly<br />

'd<br />

Figure 4-251. Retrievable MWD tool . (Courtesy Anadrill [ 1061 .)

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