Main functions

Christmas tree has the following functions:

(1) Connect each layer of casing under the well, seal the annular space of each layer of casing, and hang the weight of casing.

(2) Hang tubing and downhole tools, support the weight of all tubing strings in the well, and seal the annular space between tubing and casing.

(3) Control and regulate the production of oil wells.

(4) Ensure the construction of various downhole operations, facilitate the construction of well killing operations, tripping operations and other measures, and carry out daily production management such as pressure measurement and wax removal.

(5) Record oil pressure and casing pressure data.

Christmas tree is also called Christmas tree. It is a kind of wellhead control device when testing oil and gas after the completion of oil (gas) wells, or when producing oil from flowing wells and mechanical production wells. It is composed of tubing hanger, many gates and tees or crosses, and is directly installed on the casing head. A Christmas tree with an oil outlet pipe on only one side is called a single winged Christmas tree; Those with oil outlet pipes on both sides are called Double winged Christmas trees. The Christmas tree is equipped with nozzles (choke nozzles), and the oil and gas production is controlled by replacing nozzles with different inner diameters.