This article appears to be a dictionary definition. Please rewrite it to present the subject from an encyclopedic point of view.(May 2023)
(a) is an imaginary line representing the true vertical depth, while line (b) is the borehole itself, and its length is called the measured depth.
True vertical depth[1] is the measurement of a straight line perpendicularly downwards from a horizontal plane.
In the petroleum industry, true vertical depth, abbreviated as TVD, is the measurement from the surface to the bottom of the borehole (or anywhere along its length) in a straight perpendicular line represented by line (a) in the image.
Line (b) is the actual borehole and its length would be considered the "measured depth"[2] in oil industry terminology. The TVD is always equal to or less than (≤) the measured depth. If one were to imagine line (b) to be a piece of string, and further were to imagine it being pulled straight down, one would observe it to be longer than line (a). This example oil well would be considered a directional well because it deviates from a straight vertical line.
^"True vertical depth". Schlumberger. Archived from the original on January 13, 2006. Retrieved June 7, 2023.
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