Geosteering involves taking petrophysical measurements via MWD and LWD at or near drill bit and sending data back to the drilling team in real time. The drill bit is steered optimally through formation and enables to handle geological uncertainties. As a result is smaller and deviated targets are achieved successfully. In conventional deviated drilling, the well path is steered according to a predetermined geometric plan defined by rigid boundaries. Geosteering is a departure from this convention because it involves the use of LWD data to place the wellbore in the proper position when the geological marker is ill defined, target tolerances are tight, or the geology is complicated as to make conventional deviated drilling impractical. The Geosteering involves calculation of the orientation of the deflection tools; control of actual hole.
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