Downhole material retention apparatus
AssigneeBaker Hughes Incorporated
InventorsGerald D. Lynde, John P. Davis
Life of this patent
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Abstract
A debris removal device features structural support from an exterior housing that allows more space for debris collection. The debris enters the collection volume from the top to eliminate debris from having to go through a valve. The screen in the device is disposed internally to protect it during handling and running. A variety of external flow diverters are used to direct debris laden fluid into the tool and to keep debris out of an annular space around the tool that could interfere with its removal. The diverters can be actuated by relative movement in the tool or applied pressure to a piston which can inflate a sleeve or orient or misalign paths through brushes for selective bypassing of fluid exterior to the tool.
Claims17
A debris removal apparatus for mounting in a tubular string downhole that supports a mill that generates the debris or another downhole tool, comprising:
- a top and a bottom end for connecting to the string, said ends structurally held together to support string weight from said lower end through an outermost exterior housing;
- a flow tube within said outermost exterior housing to conduct flow between said ends to the mill or other downhole tool, said flow tube defining an annular space with said outermost exterior housing;
- at least one diverter extending from said outermost exterior housing to divert flow and cuttings returning from the mill or tool from going past said outermost exterior housing on the outside of said outermost exterior housing and to direct flow into said annular space for retention of debris from flow that then exits said annular space;
- said diverter is selectively movable between a retracted and an extended position.
Dependencies are inferred from the claim text.