down-the-hole drilling
81Oil well control — is the management of the dangerous effects caused by unexpected high pressures upon surface equipment of oil or gas drilling rigs. Technically, oil well control involves preventing Formation fluid, usually referred to as kick, from entering into… …
82Completion (oil and gas wells) — This article is about the oil or gas well completion. For other uses of completion, see Completion (disambiguation) In petroleum production, completion is the process of making a well ready for production (or injection). This principally involves …
83Conasauga shale — Coordinates: 33°41′55.09″N 85°36′14.74″W / 33.6986361°N 85.6040944°W / 33.6986361; 85.6040944 The Conasauga Shale is a Cambri …
84Expandable tubular technology — is a system for increasing the diameter of the casing or liner of an oil well by up to 20% after it has been run down hole.ChallengesTwo challenges facing the Oil Gas industry are accessing new reservoirs that currently cannot be reached… …
85List of Chinese inventions — A bronze Chinese crossbow mechanism with a buttplate (the wooden components have …
86Crandall Canyon Mine — Coordinates: 39°27′36″N 111°10′04″W / 39.460000°N 111.167639°W / 39.460000; 111.167639 The Crandall Canyon Mine, formerly Genwal …
87coal mining — Coal was very important in the economic development of Britain. It was used as fuel in the factories built during the Industrial Revolution and continued to be important until the 1980s. The main coalfields are in north east England, the north… …
88Arctic Regions — ▪ 2009 The Arctic regions may be defined in physical terms (astronomical [north of the Arctic Circle, latitude 66° 30′ N], climatic [above the 10 °C (50 °F) July isotherm], or vegetational [above the northern limit of the tree line]) or in human… …
89Pumpjack — Nodding donkey redirects here. For the British Rail train, see Pacer (train). Pump jack redirects here. For the Scaffold, see Pump jack. A diagram of a pumpjack. A pumpjack (nodding donkey, pumping unit, horsehead pump, beam pump, sucker rod pump …
90Drill string — A drill string on a drilling rig is a column, or string, of drill pipe that transmits drilling fluid (via the mud pumps) and torque (via the kelly drive or top drive) to the drill bit. The term is loosely applied as the assembled collection of… …
