It could also be الاختراق
Drilling Technology for construction of wells
Specialized equipment for drilling (perforation)

While the concept for rotary drilling - using a sharp, spinning drill bit to delve into rock - is quite simple, the actual mechanics of modern rigs are quite complicated. In addition, technology advances so rapidly that new innovations are being introduced constantly. The basic rotary drilling system consists of four groups of components. The prime movers, hoisting equipment, rotating equipment, and circulating equipment all combine to make rotary drilling possible

Low-cost shallow tube well construction in West Africa, M. Sonou
... Materials and equipment (Kana State Agricultural and Rural ... method should be considered
where full penetration of the ... Dig pits for drilling fluid and place a ...
www.fao.org/docrep/W7314E/w7314e0v.htm - 49k - Cached - Similar pages

NaturalGas.org
... uses a sharp, rotating drill bit to dig down through ... of the drill bit allows for
penetration of even ... which is attached to the hoisting equipment, carries the ...
www.naturalgas.org/naturalgas/extraction_rotary.asp - 36k - Cached - Similar pages

Arcs in Action Spring 2001
... takes about two days to dig, reinforce and ... these cross braces require a full-penetration
weld 4 ... concrete decking that allows construction equipment and traffic ...
www.appliedwelding.com/arcs_in_action/arc1sp01.html - 29k - Cached - Similar pages



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Note added at 2004-02-20 00:40:11 (GMT)
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http://www.naturalgas.org/naturalgas/extraction_rotary.asp