Directional drilling is defined as the practice of controlling the direction and deviation of a wellbore to a predetermined underground target or location. The most common deviation tools for directional drilling are steerable motor assemblies (or so-called positive-displacement motors - PDMs) and rotary steerable systems (RSSs). Adjustable-gauge stabilizers, known as “2D rotary systems,” have become quite popular to run with the rotary and PDM assemblies to control inclination. Whipstocks, especially casing whipstocks, are used routinely to sidetrack out of cased wellbores. (Source: Petrowiki)
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Imagine drilling for thousands of feets and suddenly your drillpipe becomes stuck. You try everything possible to release your drillpipe and resume drilling, but the more you keep trying to free your pipe, the more frustrating it becomes. Starting afresh is not an option either, as it will be too expensive and time consuming. In times like this, we need to sidetrack the well. Just drill a new hole right from the troublesome one and continue our journey to the payzone. This is where a whipstock (photo) comes in. A whipstock is also used to deliberately change the direction of the well for example in directional drilling. Another example is when we discover to our horror that the bit is just drilling towards the wrong direction, we make use of a whipstock to correct this and restore the bit back to the direction that leads us to the payzone.
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