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(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.
In the oil industry measured depth (commonly referred to as MD, or just the depth) is the length of the drilled borehole.[1] In conventional vertical wells, this coincides with the true vertical depth, but in directional or horizontal wells, especially those using extended reach drilling, the two can deviate greatly. For example, at the time of writing (2012) a borehole in Odoptu field, Sakhalin-I, has the greatest measured depth of any borehole at 12,345 m, but most of this is horizontal, giving it a true vertical depth of only 1,784 m. For comparison, the Kola Superdeep Borehole has a slightly shorter measured depth at 12,262 m, but since this is a vertical borehole, this is also equal to the true vertical depth, making the Kola Superdeep Borehole deeper by a factor of 6.9.
^Schlumberger (2011). "Measured depth". Oilfield Glossary. Retrieved 3 February 2011.
In the oil industry measureddepth (commonly referred to as MD, or just the depth) is the length of the drilled borehole. In conventional vertical wells...
given point in a wellbore: the measureddepth (MD) measured along the path of the borehole, and the true vertical depth (TVD), the vertical distance between...
would be considered the "measureddepth" in oil industry terminology. The TVD is always equal to or less than (≤) the measureddepth. If one were to imagine...
drilled the deepest oil well in history at a vertical depth of 35,050 ft (10,683 m) and measureddepth of 35,055 ft (10,685 m) in the Tiber Oil Field at Keathley...
vertical depth, it remains the deepest borehole in the world. For two decades, it was also the world's longest borehole in terms of measureddepth along...
directly measureddepth of 10,714 m (35,151 ft) is third only to the Challenger Deep and Horizon Deep, currently the deepest known directly measured places...
19111, offers the following two definitions: depth: "distance of a point from a chosen reference surface measured downward along a line perpendicular to that...
although its exact geodetic location remains inconclusive and its depth has been measured at 10,902–10,929 m (35,768–35,856 ft) by deep-diving submersibles...
rain on accumulated snow. Most precipitation records are based on a measureddepth of water received within a fixed time interval. Frequency of a precipitation...
absorption. The optical depth of the atmosphere can be measured with a Sun photometer. The optical depth with respect to the height within the atmosphere is...
level alone. The initial measureddepth of the Great Blue Hole was about 125 m (410 ft) which is the most often cited depth up to this day. An expedition...
Orlan Platform in the Chayvo Field, Sakhalin-1 Project with a total measureddepth of 13,500 m (44,294 ft) and a horizontal displacement of 12,030 m (39...
title of the world's longest borehole on 27 August 2012. Z-44's total measureddepth is 12,376 m (40,604 ft). However, ERD wells are more shallow than the...
with a maximum measureddepth of 392 metres (1,286 ft). In 2022 the UNEXMIN Georobotics Ltd reached 450 metres (1,480 ft) water depth with the UX1-Neo...
conductor, between the outer surface and a level called the skin depth. Skin depth depends on the frequency of the alternating current; as frequency...
inch. In optometry depth of focus is usually measured in dioptres. The same factors that determine depth of field also determine depth of focus, but these...
key clipper is a recognised example). The key to be duplicated is measured for the depth of each notch with a gauge and then placed into a device with a...
specific measurement of liquid pressure above a vertical datum. It is usually measured as a liquid surface elevation, expressed in units of length, at the entrance...
measured at any given point in a wellbore in order to determine its position: the depth of the point along the course of the borehole (measureddepth)...
known natural caves according to maximum surveyed depth as of 2023[update]. The depth value is measured from the highest to the lowest accessible cave point...
regulations. Tonnage measured a ship's cargo capacity and was used to calculate tax and harbour dues. The new 1836 regulations measureddepth and breadth with...
linear dimensions (width, height, diameter, perimeter). Size can also be measured in terms of mass, especially when assuming a density range. In mathematical...
rests 770 metres (2,510 ft) above the sea level, and has a maximum measureddepth (as of 2007) of 464 metres (1,522 ft). Its seven branches are named...
Line (a) is an imaginary line representing the true vertical depth, while line (b) is the borehole itself, and its length is called the measureddepth...
determine the London penetration depth, and in particular its temperature dependence. London penetration depth can be measured by muon spin spectroscopy when...
device originally created for the job of reflectance capture. The depth can also be measured using the standard time-of-flight (ToF) technique, more or less...
in the municipality of Sørfold in Nordland county, Norway. It has a measureddepth of 497 metres (1,631 ft) and explored length of more than 25 kilometres...
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