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Christmas tree, wellhead tree, wellhead christmas tree, api 6a christmas tree, api 6a wellhead is a wellhead assembly of flowing well and mechanical recovery well. It’s used to hang tubular column in G.I.H, seal the space of oil casing pipe, control and regulate making of wellhead and assure it normal of manufacturing, working, casing pressure, testing, paraffin removal and so on.
Main function: 1. Hanging pipe line bears all the weight of tubular column.
2. Seal the circular space between oil tube and casing pipe.
3. Control and regulate prodution of wellhead.
4. Assure the assignment normal in wellhead
5. Normally administrate pressure figure getting, casing pressure, testing. paraffin removal etc.
1.Opening and closing equipment for natural, oil, chemical pipelines, air defense systems.
2.The valve has all the advantages of directed flat gate valves.
3.This valve seal is hard seal (alloy surface), resistant to erosion, using the upstream and downstream pressure differential automatically to add sealing grease assisting sealing, can also add sealing grease from valve outside.
4.Lapping seal surface to get reliable and long service life.
5.All valve design for the sulfur resistance.
6.There are two types including a balancing pole and excluding a balancing pole, both operating torque are small.
Tubing head is installed above the casing head with the role to hang the well tubing and seal the space between the tubing and casing annular. Currently, normally adopt the jackscrew valve suspension method. That means on the casing spool installing a jackscrew valves, on the top it has a conical body. Tubing hanger is also a cone type. With a ring on, in all the wellbore tubing weight pulling force, tubing hanger is put firmly inside the seat of jackscrew valve. The jackscrew is to prevent the well pressure too high to make the tubing string out of the tubing.
Casing head is a kind of special short connector. When on land or sea drilling, in order to support, fix the casing string down into well, install BOP stack and wellhead equipments, with threaded or flange connection with the top of casing string and is located in the outer casing.
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