Definition - What does Christmas Tree mean?
A Christmas tree in trenchless construction is a set of valves, chokes, and other fittings at the top of a well to control production or flow in oil and gas wells, water injection wells, etc.
A Christmas tree also ensures well safety and acts as access for measurement tools into the well. A Christmas tree should not be confused with a wellhead as they are separate pieces of equipment. The wellhead is necessary to use a Christmas tree and work together to bring up oil and gas to the surface.
Trenchlesspedia explains Christmas Tree
A Christmas tree has five different valves namely, kill king valve, swab valve, production wing valve, and upper and lower master valve. Valves are opened once the facility is ready to produce and receive oil or gas. The functions of a Christmas tree are:
- For injecting chemicals in producing wells to solve production issues such as blockages.
- To sustain economical production volume from surrounding wells by controlling the injection of gas or water in a producing or non-producing well.
- The control system of the tree controls the downhole safety valve and the tree acts as a conduit for the control system to the downhole safety valve.