Continuous drilling fluid circulation unit and arrangement
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United States of America Patent
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Oct 3, 2017
Grant Date -
Feb 11, 2016
app pub date -
Apr 3, 2014
filing date -
Apr 8, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A circulation unit and an arrangement are arranged to continuously circulate drilling fluid during drilling. A housing is provided with a center bore arranged to accommodate a portion of a pipe. The center bore includes upper and lower sealing elements. The sealing elements are provided with center openings which, by the expansion of said sealing elements, are closable or fit tightly against the pipe by the abutment of an inner sealing surface against the pipe. Each of the sealing elements is connected in a fluid-tight manner to a packing pipe which is located in the housing and which is rotatable around the center axis of the center bore. The packing pipe is surrounded by a packing assembly fitting tightly between the periphery of the packing pipe and the housing.
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