Azimuth of the hole
AZIMUTH OF THE HOLE (EN: hole azimuth; DE: Bohrlochazimut; FR: azimut de puits; ES: azimut del pozo; RU: азимут скважины) is the angle, which is measured clockwise between the certain direction, which is passing through the axis of the well, and the projection of the well on the horizontal plane (Figure).
Depending on the adopted direction of reference (geographical meridian, magnetic meridian, or arbitrary direction), they distinguish the types of the azimuth of the hole, namely true, magnetic, or angular.
The azimuth of the hole is the important parameter during the drilling; for example, when the azimuth of the hole changes by 10, the deviation of the well from the designed direction for the depth of 1 kilometre would be 17.5 metres. They monitor the azimuthal direction of the well during the process of the drilling by the inclinometer at the every 50-100 metres, and in the complicated geological conditions at the every 20-25 metres.
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