Introduction:

Wellhead:the surface equipment set under the master valve which is the linking between the Christmas tree and production tubing As we can see in Fig 1.1 This assembly includes casing heads and a tubing head .

Figure 1.1 Wellhead

(B. Guo, W. C. Lyons and A. Ghalambor (2007): Petroleum Production Engineering)

1-Casing head : A flanged connection that is installed on top of a casing string for hanging a casing string ,The casing head has a bowl that supports the casing hanger.

Figure 1.2 casing head (B. Guo, W. C. Lyons and A. Ghalambor (2007): Petroleum Production Engineering)

1-A-Casing hanger: The casing hanger is a wellhead assembly which is supports the casing string , It functions to ensure that the casing is completly set.

Figure 1.3 Casing Hanger (B. Guo, W. C. Lyons and A. Ghalambor (2007): Petroleum Production Engineering)

2-Tubing Head:Is a equipment with two flange used for hanging tubing string on the production casing head, and it will provides a means of attaching the Christmas tree to the wellhead