### What is the difference between wellhead and Christmas tree?
**Wellhead:**.
1. **What is a wellhead?**.
- A wellhead is the equipment installed at the top of an oil or gas well to control the flow of fluids from the well.
2. **What are the main components of a wellhead?**.
- The main components of a wellhead include the casing head, tubing head, and Christmas tree.
**Christmas Tree:**.
1. **What is a Christmas tree?**.
- A Christmas tree is a set of valves, spools, and fittings that control the flow of oil or gas from a well.
2. **How is a Christmas tree different from a wellhead?**.
- While the wellhead is the equipment at the top of the well that provides support for the Christmas tree, the Christmas tree is the actual set of valves and other equipment that controls the flow of fluids from the well.
In summary, the wellhead is the structure that supports and seals the top of the well and provides a means of mounting the Christmas tree. The Christmas tree, on the other hand, is the set of valves, spools, and fittings that control the flow of oil or gas from the well to the surface. The wellhead and Christmas tree work together to ensure the safe and efficient extraction of oil or gas from a well.
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