Abstract: For milling a window into a casing that has been cemented in a well, a whipstock and a mill bit are connected at the end of a Bottom-Hole-Assembly, which includes downhole sensors. The mill bit cuts an exit window into and out of the casing. Preferably, the operation of the drilling equipment that actuates the mill bit is controlled based on measurements performed by the downhole sensors, and the control takes into account changes in the interface between the mill bit and the material (e.g., the casing steel, the cement) being milled and/or the changes in the volume of milled material as the mill bit penetrates through the casing. The control can minimize a difference between the mechanical specific energy values calculated in real-time and a predetermined target value.

Abstract: Methods and systems for conducting downhole operations including collecting downhole dynamic event data using a downhole tool, wherein the downhole dynamic event data is time-domain data, processing the collected downhole dynamic event data using a computing system located downhole to convert the time-domain data into frequency-domain data, and extracting digital filter coefficients from the frequency-domain data.

Abstract: Methods and systems for conducting downhole operations including collecting downhole dynamic event data using a downhole tool, wherein the downhole dynamic event data is time-domain data, processing the collected downhole dynamic event data using a computing system located downhole to convert the time-domain data into frequency-domain data, and extracting digital filter coefficients from the frequency-domain data.