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Drilled wells are usually cased with a factory-made pipe composed of steel or plastic. ... is billed as the world's largest hand-dug well, at 109 feet (33 m) deep and ...
A tube well is a type of water well in which a long, 100–200 millimetres (3.9–7.9 in)-wide, stainless steel tube or pipe is bored underground. The lower end is fitted with a strainer, and a pump lifts water for irrigation. The required depth of the well depends on the depth of the water table.
Casing Diameters of a Borehole Casing Diagram premium gas tight connections on a casing string. Casing is a large diameter pipe that is assembled and inserted into a recently drilled section of a borehole.
For some deep wells, e.g. 7,000 m or 25,000 ft deep, the drill pipe elongation due to its own weight and temperature must be taken into account. This can be on the order of 24 m (80 ft). Wireline does not behave this way: it tends to lengthen under tension but shorten with increasing temperature.
The well is therefore drilled in sections, with each section of the well being sealed off by lining the inside of the borehole with steel pipe, known as casing, and filling the annular space (or at least the lower portion) between this casing string and the borehole wall with cement.
The well is created by drilling a hole 12 cm to 1 meter (5 in to 40 in) in diameter into the earth with a drilling rig that rotates a drill string with a bit attached. At depths during the process, sections of steel pipe , slightly smaller in diameter than the borehole at that point, are placed in the hole. Cement slurry will be pumped down the ...
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From 2011 until August 2012 the record was held by the 12,345-metre (40,502 ft) long Sakhalin-I Odoptu OP-11 Well, offshore the Russian island Sakhalin. [11] The Chayvo Z-44 extended-reach well took the title of the world's longest borehole on 27 August 2012. Z-44's total measured depth is 12,376 metres (40,604 ft).
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