Operating Method of oil systemWeighing drilling stringIn order to determine the drilling pressure i.e. to determine the pressure gain or deficit according to the formations, bore hole conditions and drilling methods, the drilling string should be weighed before starting drilling. This should be done after lowering down the drilling string, but before starting around trip and at the status of flushing, rotating and floating the drilling string. At first, pull the direction control handle to lift the drilling string from the hole bottom, then star flushing and rotating and lower the drilling string slowly, meanwhile pull the control handle in "weighing" position,
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