Arrangement for preventing collection of debris and cuttings on the top of a riser closure device
AssigneeEnhanced Drilling AS
InventorPer Christian STENSHORNE
Life of this patent
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Abstract
An arrangement and a method for preventing collection of debris on or for removing debris, such as cuttings, from the top of a closed riser sealing device (215) in a subsea riser (1). The arrangement comprises a flushing line and at least one flushing fluid inlet (294) to direct a jet of flushing fluid into said riser (1). The inlet (294) directs flushing fluid into a space in the riser (1) immediately above said closing element. The invention also relates to a swirl element (351) located immediately above the riser sealing device (215) and being rotationally coupled to a drillstring (11).
Claims20
An arrangement for preventing collection of debris on or for removing debris from the top of a closed riser sealing element in a subsea riser, comprising a flushing line and at least one flushing fluid inlet into the riser, the inlet directing a jet of flushing fluid into a space in the riser immediately above the closing element.
An arrangement for preventing collection of debris on or for removing debris from the top of a closed riser sealing device in a subsea riser, comprising a swirl element located immediately above the riser sealing device, the swirl element being rotationally coupled to a drill string but being allowed to slide axially with respect to the drill string.
A method for preventing collection of debris on or for removing debris from the top of a closed closing element in a subsea riser, wherein the debris is agitated by a jet of fluid being injected into a space in the riser immediately above the closing element, to stir up any debris from the top of the closing element.
Dependencies are inferred from the claim text.