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Christmas tree 5 foot. The technology of 5 and 10 ksi trees is common and is used in water depths greater than 1000 m. An xt xmas tree or tree contains seals and valves which safely isolate the product oil gas andor water within the wellhead the top of the tube that penetrates the ground and goes all the way to the reservoir. A connector 22 for locking said christmas tree to a wellhead.
Different pressure ratings are used at different water depths. A guide structure 24 consisting of a central ring attached to said connector 22 supporting arms 26 and guide funnels 28 carried by said guide structure. It controls the flow of product from the wellhead.
Christmas trees are used on both surface and subsea wells current technical limits are up to around 3000 metres and working temperatures of 500f to 3500f with a pressure of up to 15000 psi. The pressure ratings for subsea christmas trees are 5 10 and 15 ksi in accordance with api 17d 6 and api 6a 7. Simplicity and reliability as design principle applicable to most small sized wellheads to form simple christmas tree with tubing hanger interface.
It is common to identify the type of tree as either subsea tree or surface tree. The christmas or xmas tree can be used both on the surface or subsea in oil and gas operations. It is composed of a variety of valves which are used for testing servicing regulating or choking the stream of produced oil gas and liquids coming up from the well below.
To find out more about the aquasign fixing recommendations for trees both onshore and offshore please visit our trees page. Christmas trees are used on both surface and subsea wells. A protection cap 34.
A valve block 30 coupled at a top thereof to a reentry mandrel 32 and including at a bottom thereof means for coupling said valve block to said connector 22 or to a spacing spool. The shape of the wellhead structure with valves looks like a pine tree so the wellhead is called as christmas tree. Since the 1950s subsea trees have been topping underwater wellheads to control oil and gas flow to the surface.
A subsea xmas tree is basically a stack of vertical and horizontal valves installed on a subsea wellhead. In petroleum and natural gas extraction a christmas tree or tree is an assembly of a multi valved structure consisting of valves spools and fittings used to control the ow of oil from the well. The only subsea vertical christmas tree with concentric structure in the world at present leading the design trend of the future subsea vertical christmas trees.
Each of these classifications has a number of variations. The deepest installed subsea tree is in the gulf of mexico at approximately 9000 feet.
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