Measuring and transmitting apparatus for use in a drill string

Details Measuring and transmitting apparatus for use in a drill string Measuring and transmitting apparatus for use in a drill string

E - Fixed Constructions

21

B

255/1

E21B 7/12 (2006.01) E21B 47/022 (2006.01)

Patent

CA 1109452

MEASURING AND TRANSMITTING APPARATUS FOR USE IN A DRILL STRING Abstract of the Disclosure Measuring and transmitting apparatus is the subject matter of the preferred embodiment which comprises an elon- gate tubular member functioning as a drill collar and adapted to be placed in a drill string. The apparatus utilizes a mud driven motor, while 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 other- wise 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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