Christmas tree

1. n. [Drilling]
The set of valves, spools and fittings connected to the top of a well to direct and control the flow of formation fluids from the well.

Christmas tree
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2. n. [Well Completions]
An assembly of valves, spools, pressure gauges and chokes fitted to the wellhead of a completed well to control production. Christmas trees are available in a wide range of sizes and configurations, such as low- or high-pressure capacity and single- or multiple-completion capacity.