RESEARCH ON INFLUENCE OF TEMPERATURE ON DRILL-STRING VIBRATION CHARACTERISTIC DURING DEEP-WELL DRILLING

Drill-string vibration is the main reason of drilling-string failure. In the process of deep-well or ultradeep well drilling, the phenomenon presents very obviously. Based on the experiment in the lab, the mechanical properties of drill-string and the change relation of rheological parameter of drilling fluid with temperature were established. Then the property of drill-string vibration was computed in an ultra-deep well.The calculation result compared with the character of drill-string vibration in the normal temperature, the result proved the temperature could affect the property of drill-string vibration.