Operations Manual
Relogging for MWD: In order to reduce shocks and vibrations while relogging, it is recommended to pump at the minimum telemetry flow of the MWD. Minimum telemetry should be regarded as the minimum flow to decode MWD telemetry. While reaming at minimum telemetry flow do not drop below the recommended flow for reaming with the RST (see Appendix A), or the low flow limit of the mud motor. Bit RPM should be at least 40 RPM and kept as low as practically possible to reduce vibrations to the RST. Off Bottom Circulating If circulating off bottom for a period greater than 20 minutes is necessary, e.g. clean up cycle or rig repair, downlink the D-Tech RST to neutral Steering Mode until drilling operations can resume. Circulating below the minimum flow-rate for the RST for extended periods is not advisable as it can damage the tool. Clean up Cycles: • When approaching the final stand of the run, reduce the ROP to 5-8ft/hr (Depending of time of clean up cycle) and drill ahead for 6-8hrs. • Keep flow rate at drilling flow rate and pump sweeps as needed • Surface RPMs can be increased to increase the transfer of cuttings to surface. • At the end of the clean-up cycle the BHA will have efficiently cleaned the hole and we will have minimized shock and vibration to the BHA. Pump or Rig Repair: • If there are rig repairs or pump repairs, and we are circulating off bottom. Make sure that we can circulate above the low flow limit of the motor, and the minimum flow rate of the RST (see Appendix A). • Set ROP at 5-8 ft/hr and continue to drill ahead ensuring that the bit is on bottom. • When rig repairs are complete return to drilling at normal ROP.
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