In order to investigate the effect of weight in horizontal drilling, the deviation on the drill string must be examined as an effective parameter.
Several performance criteria were analyzed and it was observed that a minimization of the mean deviation of the drill-bit angular velocity relative to the target one would provide the best operating condition.
These functions evaluate the square differences between the simulated and nominal radii and diameter values, minimize the maximum values of the latter quantities, and minimize the deviations of the drilled surface from a perfect cylinder.
Another possibility could have been the deviation of the existing drilled well toward easterly direction, covering high-amplitude anomalies.
The red curve shows the standard deviation of the stretching coefficients measured before the drilling activities.
Shows the difference between the average of the drill size and the mean of the measurements for each method with respective standard deviations.
the correct centering of the targeted site, the presence or absence of perforation, the drilling depth, the deviation of the vestibulolingual direction relative to a reference axis on the control model, the deviation of the mesiodistal direction relative to a reference axis on the control model, the global drilling time.
The evaluation was focused on the correct centering of the targeted site, the presence or absence of perforation, the drilling depth, the deviation of the vestibulolingual direction relative to a reference axis on the control model, the deviation of the mesiodistal direction relative to a reference axis on the control model, the global drilling time.
The standard deviation of the SCs obtained before the first drilling (190 days) is also displayed as a function of local hour (Figure 9, right side, red curve).
