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API 6A Wellhead Christmas Tree / Wellhead X Tree For Drilling Operation
The wellhead Christmas Tree sits on top of the actual oil or gas
well that leads down to the reservoir.It consists of all permanent
equipment between the uppermost portion of the surface casing and
the tubing head adapter connection.
The wellhead christmas tree assembly consists of various equipment
components that include flanges,pressure gauges,valves,casing
hanger,and secondary seal.
A wellhead x - tree serves numerous functions.Some of these are:
1)Suspending casing(casing is a concentric pipe that is installed
in the drilled hole after drilling to control pressure and prevent
the drilled hole from collapsing.Casing installation is
permanent-it is cemented).
2)Allowing tubing to be suspended in the well and the flow of oil
gas to be controlled via chokes at the surface(Tubing is a small
diameter
removable pipe installed in the well).
3)Means of well pump attachment,pressure monitoring,and creating
pumping access to annulus.[Annulus:The area between the outside
diameter(O.D.)of an inside string and the inside diameter(I.D.)of
an outside string]between the different casing/tubing strings could
be
achieved through wellhead.
Technical parameter of Wellhead Christmas Tree
Working pressure | 2000psi-20000psi. |
Working Media | Petroleum,Natural gas,Mud and other gas containing H2S And CO2 |
Working Temperature | L-U |
Material Grading | AA,BB,CC,DD,EE,FF. |
Specification Class | PSL1-4 |
Performance Class | PR1-2 |