Patent ID: 8453738

Claim:
A subterranean tool configured to operate at elevated temperatures downhole in a well traversing a formation, comprising: a tool conveyance configured for deployment in the well; a downhole tool comprising high-temperature sensitive components attached to the tool conveyance; and a downhole cooling system, comprising: a cooling fluid conduit having a first end configured for fluid connection with a source of cooling fluid and a second end configured for discharging cooling fluid in a region of the downhole tool, wherein the cooling fluid conduit is structured or arranged to discharge cooling fluid at at least an upper portion of a subterranean high-temperature zone such that cooling fluid circulates in the high-temperature zone, the subterranean tool further comprising: an inverted Y tubular junction, wherein an upper end of the Y tubular junction is configured for connection with an upper portion of the tool conveyance extending from the surface of the well; a first lower end of the Y tubular junction is configured for connection with a lower portion of the tool conveyance extending downhole into the well, the lower portion of the tool conveyance comprising a plurality of tool cartridges or shuttles for deployment in the well; a second lower end of the Y tubular junction is configured for connection with the cooling fluid conduit, the cooling fluid conduit being attached to the lower portion of the tool conveyance; and a plug in the inverted Y tubular junction such that cooling fluid flowing through the upper portion of the tool conveyance flows into the cooling fluid conduit and does not flow into the lower portion of the tool conveyance.