What are the classifications of Christmas trees?

There are many types of Christmas trees. According to the application area, they are divided into above-water Christmas trees (placed on the platform deck) and underwater Christmas trees (placed on the seabed); according to the installation position, they are divided into vertical (or vertical) Christmas trees, horizontal ( or horizontal) Christmas tree, plug-in (or caisson) Christmas tree; divided into dry Christmas tree, wet Christmas tree and dry/wet Christmas tree according to the structure; divided into satellite well Christmas tree and chassis well according to the layout of the well Christmas tree.