Modeling the Affect of a Downhole Vibrator

Abstract Downhole vibration tools are becoming an accepted method of extending the reach of coiled tubing (CT) and jointed pipe (JP) in extended reach wells. They are being used in both well service and well drilling operations. Experimental work was done which shows how the energy generated by dynamic excitation mitigates a certain amount of friction. A tubing forces (torque and drag) model was modified to include friction mitigation due to the vibration. This modification to the model was much more complex than simply modifying the friction coefficient as has been done in the past. This paper will discuss the experimental work, the modifications to the model, and case histories in which a vibration tool was used. Model results will be compared to actual field results.