| 摘要 |
Measuring and transmitting apparatus is the subject matter of the preferred embodiment which comprises an elongate tubular member functioning as a drill collar and adapted to be placed in a drill string. The apparatus utilizes a mud driven motor, while the mud flows therethrough functioning as a drill collar and out the bottom. The motor creates electric power which is used to operate selected transducers. The transducers form measurements which are encoded. The encoding portion of the equipment utilizes an oil reservoir, a mud driven pump, a valve which dumps the oil back to the reservoir if there is no signal and which otherwise delivers it to a two-position, four-way spool valve which drives a modulated signal generator. The signal generator modulates the back pressure in the mud flow by restricting the mud flow, thereby forming a signal which is sensed in the mud flow path.
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