What are the application changes of Wellhead assy and X-mas Tree in different stages of oil and gas well exploitation?

In different stages of oil and gas well exploitation, Wellhead assy and X-mas Tree have different application changes.
In the drilling stage, Wellhead assy plays a key role. It hangs the casing and provides pressure sealing for the casing string. At the same time, it supports the blowout preventer to ensure the safety of the drilling process and prevent accidents such as blowouts.
In the completion stage, Wellhead assy needs to support the installation and connection of the frac Christmas tree to prepare for subsequent production. X-mas Tree begins to play a role at this time. Its main valve, wing valve and other components can control and adjust the flow of oil, gas and water in the wellbore to prepare for production.
Entering the production stage, the role of X-mas Tree is more important. It accurately controls the flow and pressure of oil and gas through various valves to ensure stable and safe production. At the same time, it also provides interfaces for water injection, gas injection, acidizing and other well repair operations, which is convenient for production increase and maintenance operations.
During the maintenance and overhaul phase of oil and gas wells, the various valves and components of the Wellhead assy and X-mas Tree can be easily operated and maintained. For example, the swabbing valve can be used to perform well intervention, maintenance or logging operations without killing the well.