E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
73/168, 255/25,
E21B 47/10 (2006.01) E21B 7/128 (2006.01) E21B 21/00 (2006.01) E21B 21/08 (2006.01)
Patent
CA 1057081
Abstract of Disclosure Method and apparatus for determining on board a heaving drilling vessel, the flow rate of drilling fluid flowing from a wellhole and into a telescoping marine riser connect- ing the wellhole with the vessel. A measuring apparatus is associated with a drilling fluid return conduit of the riser in such a position that the measuring apparatus and the portion of the conduit between the measuring apparatus and the riser are at all times filled with drilling fluid. The measuring apparatus generates a first signal proportioned to the flow rate of drilling fluid flowing therethrough, measures the drilling fluid level in the riser and generates a second signal proportional to the change in volume of the drilling fluid contained therein above the point at which the conduit intersects the riser. The telescoping movement of the riser is measured and a third signal is generated proportional to the change in volume of the flow path pro- vided by the riser between the wellhole and said point. The first, second and third signals are correlated with each other whereby the measured flow rate of the drilling fluid is modified to compensate for the telescoping of the marine riser and the drilling fluid stored in the marine riser above the point the conduit intersects with the marine riser, whereby the true flow rate of the drilling fluid flowing out of the wellhole and into the marine riser is determined onboard the heaving vessel.
260894
Barton Charles E.
Maus Leo D.
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