For decades the uppermost assembly of gate valves installed on a oil or gas well has been referred to as a “Christmas tree”. A Christmas tree or more generically, a production tree, is used to control the flow of oil or gas from a well during production. Today’s oil & gas production tree has become more sophisticated and technologically advanced.
Can also be used to control the flow of gas, water or steam into a well. These media or others can be used in conjunction with enhanced oil recovery techniques
Tree design depends on the number of tubing strings used for completion, tubing bore size, maximum anticipated production pressure, trim requirements and flow rates
The bottom connection of the tree matches the top connection to the tubing head adapter
The tree and adapter are normally installed as a unit immediately after landing the tubing hanger