Downhole method and associated apparatus
AssigneeHydropulsion Limited
InventorsBrian Storie, Barry Reid
Life of this patent
Estimating the term…
Abstract
A circulating downhole tool utilising a variable fluid pressure regulated cycle valve device that can be attached to the borehole assembly BHA of a coiled tubing and used down an offshore or onshore wellbore is disclosed. The circulating downhole tool utilising a variable fluid pressure regulated cycle valve device can be remotely operated by an operator on the surface as many times as required in either the through-flow, intermediary or circulatory modes-of-operation, by simply varying the drilling fluid flow rate and pressure being supplied from the pump located on the surface and interconnected to the coiled tubing and the BHA that will include the circulating downhole tool utilising a variable fluid pressure regulated cycle valve device.
Claims12
A circulating downhole tool for selectively diverting fluid to one of:
- below the circulating downhole tool;
- or into an annulus between the circulating downhole tool and a wellbore;
- wherein the tool comprises a cycle valve device that is cyclable utilising a change in pressure above and/or below a pre-determined fluid pressure to trigger the cycle valve device to vary fluid flow diversion cyclically between below the tool and the annulus;
- wherein the cycle valve device comprises a plurality of axial through holes;
- wherein the tool comprises a plurality of channel holes comprising a first set of channel holes in fluid communication with a region below the circulating downhole tool and a second set of channel holes in fluid communication with one or more side ports;
- wherein the tool is configured to selectively open and close the one or more side ports by rotational movement of the cycle valve device about a centre-line axis of the tool, the rotational movement being responsive to a longitudinal movement of at least a portion of the cycle valve device, the longitudinal movement being associated with or triggered by a change in fluid flow or pressure by turning on or off a pump, wherein the rotation of the cycle valve device is configured to selectively align the plurality of axial through holes with the first and/or second set of channel holes;
- and
- wherein the tool is configured to be remotely operated from surface by an operator to allow selective and unlimited activation of the tool without having to be tripped or pulled out of the wellbore.
Dependencies are inferred from the claim text.