SGMG-20A2AB Yaskawa 1800w High Power Electronic Brushless Motor

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The bit tilt angle α is the resulting angle between bit axis and a line through the centers of the top and bottom stabilizers. The calculation is dependent on assumptions regarding stabilizer gauge, hole gauge, and stiffness of the Navi-Drill components. Advanced analytical software is available to calculate the theoretical DLS for a specific BHA even more precisely by using a Finite Element approach and considering the entire BHA and the wellpath.

Due to the high effort for each calculation, this procedure is only used for specific applications. The 3-point geometry approach is generally the standard procedure used to predict the dogleg severity of a tilted motor.

It is normal practice to configure a steerable system so that its DLS capability in oriented mode slightly exceeds the maximum required in the well plan. This allows for higher than planned doglegs to be drilled if it becomes necessary.

An obvious advantage of a steerable system is that the same steerable assembly can be used in rotary mode for a tangent or horizontal section without the need for a trip to change or adjust the BHA. Minor course adjustments can be made with occasional oriented sections.