Operations Manual
10. If the downlink needs to be restarted press stop, the app will remind you to shut the pumps down for 30 seconds before restarting. 11. After each downlink look at the EDR data there should be 4 uniform pulses dropping 25% from the drilling flowrate. 12. Use WITS decoder/viewer to confirm that the correct downlink sequence was performed.
If any unexpected fluctuations in standpipe pressure, differential pressure, or flowrate are observed before or during the downlink, this may result in the downlink being missed or an incorrect steering mode interpreted. If there is any doubt regarding the downlink sequence sent, recycle the pumps and return to drilling flowrate for 90 seconds before resending the downlink. Coming To Bottom Before Downlinking Tagging bottom after a connection at a rate greater than 150 ft/hr can cause disruption to the flow rate seen at the generator impeller prematurely inducing a downlink command. If a downlink is to be carried out the following guidelines should be followed. 1. Bring BHA 1-2 ft from bottom, engage rotary to desired RPM, and set ROP limiter on auto driller to a maximum of 150 ft/hr (45 m/hr). Zero weight on bit as required. 2. Once weight on bit begins to increase indicating bottom has been tagged, increase drilling parameters to desired levels.
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