Abstract: Described are various embodiments of a coiled tubing bottom hole assembly system adapted for insertion into a borehole and determining parameters of interest within the borehole. The bottom hole assembly comprises a pressure sensor array for providing differential pressure measurements across the milling assembly, at least one accelerometer for providing acceleration measurements near the bottom hole assembly indicative of at least one of vibration, bit condition, rotational speed and translational parameters and a sensor assembly for providing a measurement of weight-on-bit and applied torque. A data processor adapted to receive inputs from the pressure sensor array, the at least one accelerometer and the sensor assembly.