because the datum surface is perpendicular tothe direction of gravity at any point on it.but the horizontal surface is perpendicular to vertical at one point on it :D
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In perfectly vertical wells, the TVD equals the MD; otherwise, the TVD is less than the MD measured from the same datum. Common datums used are ground level (GL), drilling rig floor (DF), rotary table (RT), kelly bushing (KB) and mean sea level (MSL).
'Range' is the difference between the lowest datum and the highest. When dealing with a set of data, it is often convenient to first arrange the datum from lowest to highest: 149, 247, 327, 470, 498, 562, 568 The range is 568 minus 149, or 419.
Range is a concept in math, which is defined as the difference of the highest and the lowest number in data.For example, you have the averages of the number of ants per square foot in several areas:87156223504337If you arrange it from lowest to highest, it will be easier to solve for the range.22387156337504Since range = highest datum (singular of data) - lowest datum, 504 - 2 = 502.In this data, the range is, therefore, 502.
14 is 125 % of the number 14/1.25 = 11.2, where the digit after the decimal point is depressed because it may not be significant. (The datum 14 has only two significant digits.)
DataFacts, statistics used for reference or analysis.Numbers, characters, symbols, images etc., which can be processed by a computer.Data must be interpreted, by a human or machine, to derive meaning"Data is a representation of information" *Latin 'datum' meaning "that which is given"Data plural, datum singular (M150 adopts the general use of data as singular. Not everyone agrees.)InformationKnowledge derived from study, experience (by the senses), or instruction.Communication of intelligence."Information is any kind of knowledge that is exchangeable amongst people, about things, facts, concepts, etc., in some context." *"Information is interpreted data"