Essar Oil Well Head and X-Mas Tree 4.1 4. Well Head and X-Mas Tree Well Head: The surface termination of a wellbore that incorporates facilities for installing casing hangers during the well construction phase. The wellhead also incorporates a means of hanging the production tubing and installing the Christmas tree and surface flow-control facilities in preparation for the production phase of the well. A wellhead is a general term used to describe the component at the surface of an oil or gas well that provides the structural and pressure-containing interface for the drilling and production equipment. Figure 4.1: Line diagram of a well head with 2 casing policy. The well head installed in well no. 3 has the following details: 1. Casing policy 2. Casing head housing details Casing head top flange: 11” X 3000 psi Surface Casing: 9 ⅝“ Outside (Gate valve): 2 1/16” X 3000 psi Sr. No. Hole size, in Casing size, in Setting Depth, m 1 12 ¼ “ 9 ⅝“ 800 +/- 50 m 2 8 ½ “ 5 ½ “ 1400-1900 (+/- 50 m)
Transcript
Essar Oil Well Head and X-Mas Tree
4.1
4. Well Head and X-Mas Tree
Well Head: The surface termination of a wellbore that incorporates facilities for installing casing
hangers during the well construction phase. The wellhead also incorporates a means of hanging the
production tubing and installing the Christmas tree and surface flow-control facilities in
preparation for the production phase of the well.
A wellhead is a general term used to describe the component at the surface of an oil or gas well that
provides the structural and pressure-containing interface for the drilling and production equipment.
Figure 4.1: Line diagram of a well head with 2 casing policy.
The well head installed in well no. 3 has the following details:
1. Casing policy
2. Casing head housing details
Casing head top flange: 11” X 3000 psi
Surface Casing: 9 ⅝“
Outside (Gate valve): 2 1/16” X 3000 psi
Sr. No. Hole size, in Casing size, in Setting Depth, m
1 12 ¼ “ 9 ⅝“ 800 +/- 50 m
2 8 ½ “ 5 ½ “ 1400-1900 (+/- 50 m)
Essar Oil Well Head and X-Mas Tree
4.2
3. Tubing spool details
Casing spool top flange: 7 1/16 X 5000 psi
Casing spool bottom flange: 11” X 3000 psi
Outside (Gate valve): 2 1/16” X 5000 psi
4. Tubing adapter details
Adapter flange: 7 1/16” X 2 9/16” X 5000 psi
Tree adapter bottom flange: 7 1/16” X 5000 psi
Tree adapter top flange: 2 9/16 X 5000 psi
Christmas tree: A Christmas tree, or "tree", is an assembly of valves, spools, and fittings used for an oil well, gas well, water injection well, water disposal well, gas injection well, condensate well and other types of wells. It was named for its crude resemblance to a decorated tree. The primary function of a tree is to control the flow, usually oil or gas, out of the well. When the well and facilities are ready to produce and receive oil or gas, tree valves are opened and the formation fluids are allowed to go through a flow line. This leads to a processing facility, storage depot and/or other pipeline eventually leading to a refinery or distribution centre (for gas). Figure 4.2: Line diagram of a Christmas tree with 1 master valve.
Essar Oil Well Head and X-Mas Tree
4.3
Well Head and Christmas tree showing various components
