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Since the inclination is constant (refer rows in the table below) and only the azimuth changes, thus, substituting the values of I, A and MD in Equation 1 and calculating DLS, the result obtained is as tabulated below : One can easily imagine a situation when DLS is high ..

You can even perform a home based experiment to experience this situation.

Since the drill pipe is in rotational as well as performs linear motion, the drill string experiences both TORQUE & DRAG.

Torque and drag are caused by the friction between the drill string and the borehole wall.

In the above three equations, the “100” changes the dogleg severity to “per 100 feet”.

If metric system is used, the “100” should be changed to “30” for dogleg severity in degrees per 30 meters or “10” for dogleg severity in degrees per 10 meters.

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The lateral force causes the drill string to cut into the wellbore wall at the dogleg (refer figure below).

The dogleg severity is low if the changes in inclination and/or azimuth are small or occur over a long interval of course length.

The dogleg severity is high when the inclination and/or azimuth changes quickly or occur over a short interval of course length.

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