Fremgangsmate for vaeskeloft i borestigeror

A method for drilling a well below a body of water as disclosed which includes injecting into the well, at a depth below the water surface, a liquid (74) having a lower density than a density of a drilling mud (76) producing a mixture of drilling mud (76) and low-density liquid (74) in the well. The...

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Bibliographic Details
Main Authors HOPKO SANDRA N, TSAO YUH-HWANG, DAWSON CHARLES R
Format Patent
LanguageNorwegian
Published 11.02.2008
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Summary:A method for drilling a well below a body of water as disclosed which includes injecting into the well, at a depth below the water surface, a liquid (74) having a lower density than a density of a drilling mud (76) producing a mixture of drilling mud (76) and low-density liquid (74) in the well. The mixture of drilling mud (76) and low-density liquid (74) is withdrawn from an upper end of the well. The drilling mud (76) and the low-density liquid (74) are separated, with at least a portion of the separated low-density liquid (74) returned to the depth below the water surface and at least a portion of the separated drilling mud (76) returned to an upper end of the drill string (60).
Bibliography:Application Number: NO20030003720