| 摘要 |
<p num="1"><br/>A real time telemetry system is disclosed for use with a drilling system <br/>including a <br/>rotary valve 28 controlling the supply of drilling fluid or mud to a downhole <br/>tool. <br/>The system comprises receiving data to be transmitted, encoding the data as a <br/>duration, and controlling the rotation the rotary valve 28 such that the <br/>rotary valve 28 <br/>is rotated for the said duration at a predetermined rotary speed to cause the <br/>formation <br/>of pressure fluctuations or waves in the drilling fluid or mud.<br/>
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