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Priority to FR7905568ApriorityCriticalpatent/FR2449749A1/fr
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Publication of FR2449749B1publicationCriticalpatent/FR2449749B1/fr
E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
E21B19/087—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods by means of a swinging arm
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Engineering & Computer Science
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Life Sciences & Earth Sciences
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General Life Sciences & Earth Sciences
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Agricultural Machines
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Lifting Devices For Agricultural Implements
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