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2. Completion (oil and gas wells) - Wikipedia

   en.wikipedia.org/wiki/Completion_(oil_and_gas_wells)

   It is a cylindrical valve with either a ball or flapper closing mechanism. It is installed in the production tubing and is held in the open position by a high-pressure hydraulic line from surface contained in a 6.35 mm (1/4") control line that is attached to the DHSV's hydraulic chamber and terminated at surface to a hydraulic actuator. The ...

3. Wellhead - Wikipedia

   en.wikipedia.org/wiki/Wellhead

   API 6A, 20th Edition, October 2010; Specification for Wellhead and Christmas Tree Equipment; ISO 10423:2009 Wellhead and Christmas Tree Equipment; In general well heads are five nominal ratings of wellheads: 2, 3, 5, 10 and 15 (×1000) psi working pressure. They have an operating temperature range of −50 to +250 degrees Fahrenheit. They are ...

4. Casing head - Wikipedia

   en.wikipedia.org/wiki/Casing_head

   Casing heads are the primary interface for the surface pressure control equipment, for example blowout preventers (for well drilling) or the Christmas tree (for well production). The casing head, when installed, is typically tested to very strict pressure and leak-off parameters to insure viability under blowout conditions, before any surface ...

5. Christmas tree (oil well) - Wikipedia

   en.wikipedia.org/wiki/Christmas_tree_(oil_well)

   A wellhead is used without a Christmas tree during drilling operations, and also for riser tie-back situations that later would have a tree installed at riser top. Wells being produced with rod pumps (pump jacks, nodding donkeys, grasshopper pumps, and so on) frequently do not utilize any tree owing the absence of a pressure-containment ...

6. Casing string - Wikipedia

   en.wikipedia.org/wiki/Casing_string

   A liner is a casing string that does not extend to the surface, being hung instead from a liner hanger set inside of the previous casing string but usually within about 300 feet (91 m) of its bottom. Other than the obvious cost savings, the liner installation allows larger drill pipe or production tubing to be used in the upper portions of the ...

7. Downhole safety valve - Wikipedia

   en.wikipedia.org/wiki/Downhole_safety_valve

   This means that they are installed as a component of the completion string and run in during completion. Retrieving the valve, should it malfunction, requires a workover . The full name for this most common type of downhole safety valve is a Tubing Retrievable Surface Controlled Sub-Surface Valve, shortened in completion diagrams to TRSCSSV.