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Scsssv surface control subsurface safety valve
The document discusses subsurface safety valves (SSSVs), which are installed downhole to allow emergency shutdown and prevent uncontrolled hydrocarbon release from a well. SSSVs were not in place during the Piper Alpha platform disaster, exacerbating the accident. SSSVs come in two types: wireline-retrievable, which can be easily installed/removed via wireline but restrict flow; and tubing-retrievable, which are integral to the tubing and avoid flow restrictions but require pulling tubing for repair. Recommended minimum setting depths are 50m below the deepest pile for offshore and 100m below ground level for onshore. [/SUMMARY]
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Scsssv surface control subsurface safety valve
- 1. Subsurface Safety Valves Do w n h o l e E q u i p m e n t Eng. El Sayed Amer 9
- 2. Eng. El SayedAmer Page 101 Why a Sub-Surface Safety Valve (SSSV)? applications • Piper Alpha was an oil production platform in the North Sea. • on 6 July 1988, killing 167 people. • Catastrophic platform accident due to explosion in process facility and release of gas in pipeline. • Almost all of the wells controlled below seabed with SC-SSSVs!. • Only well that burnt was being worked over – no SSSV in place. Piper Alpha tragedy
- 3. Eng. El SayedAmer Page 102 Why Sub-Surface Safety Valve (SSSV)? applications • Persian Gulf War. 1991 • The Kuwaiti oil fires were caused by Iraqi military forces setting fire to a reported 605 to 732 oil wells Kuwait oil well fires
- 4. Eng. El SayedAmer Page 103 Kuwaiti oil fires
- 5. Eng. El SayedAmer Page 104 Kuwaiti oil fires
- 6. Eng. El SayedAmer Page 105 Kuwaiti oil fires
- 7. Eng. El SayedAmer Page 106 Kuwaiti oil fires
- 8. Eng. El SayedAmer 09 Subsurface Safety Valves applications • shutdown valve installed at the upper wellbore for emergency shutdown to protect the production tubing and wellhead in case of overpressure. • To prevent uncontrolled release of hydrocarbons from the well if something catastrophic occurs at surface. Operation Control Line Casing SCSSV Tubing Packer
- 9. Eng. El SayedAmer Flapper Open Flapper Close
- 10. Eng. El SayedAmer 109 Flapper type
- 11. Eng. El SayedAmer
- 12. Eng. El SayedAmer SC-SSSV Tubing Retrievable type Flapper closedFlapper open
- 13. Eng. El SayedAmer 112 WELLHEAD control panel
- 14. Eng. El SayedAmer Control line connection to downhole safety valve applications • a 1/4″ inch stainless steel control line is attached • it may be necessary to keep as much as 4000 to 5000 psi on the control line to keep the valve open.
- 15. Eng. El SayedAmer SCSSSV control line port at tubing hanger
- 16. Eng. El SayedAmer SCSSSV control line port at tubing hanger
- 17. Eng. El SayedAmer SSSV Annulus SV W/L Retrievable Tub. Retrievable Surface Controlled Hydraulic Control line Tubing SV W/L Retrievable Tub. Retrievable Surface ControlledSub-S Controlled Hydraulic WirelessCableControl lineAnnulus Electric Excess flow Pressure drop Ball Flapper Application Running Means of Activation Communication route Open & Close Element Poppet
- 18. Eng. El SayedAmer 09 Subsurface Safety Valves applications 1. Wireline retrievable (WLRSV) Deploying and retrieving • Deployed on a wireline running tool to be installed in an appropriate landing nipple. • Easy installation and removal by W/L. • A significant restriction in flow path. 2. Tubing Retrievable (TRSV) • integral part of tubing • no restriction in flow path ID • must pull tubing to repair. TRSV WLRSV
- 19. Eng. El SayedAmer 09 Subsurface Safety Valves Types
- 20. Eng. El SayedAmer 119 TR & WLR Safety Valve Landing Nipple Top Sub Functional Sub-assembly Bottom Sub LOCK MANDREL SAFETY VALVE
- 21. Eng. El SayedAmer WRSV Applications TRSV Applications General application: where intervention by wireline is available General application: where larger flow area is desired for the tubing size High pressure gas wells High volume oil and gas wells Extreme hostile environments where well fluids or temperatures tend to shorten the life of component materials Subsea completions High velocity wells with abrasive production Multiple zone completions where several flow control devices are set beneath the TRSV Greater depth setting capabilities Wireline and Tubing Retrievable Sub-Surface Safety Valve Criteria
- 22. Eng. El SayedAmer 121 Flapper type
- 23. Eng. El SayedAmer 122 Ball type A steel ball with a vertical axial hole of the same ID as the valve, rotates on its horizontal axis for closure. Rapidly being replaced by the flapper system
- 24. Eng. El SayedAmer 09 Subsurface Safety Valves applications Offshore • 50 meter below the deepest pile penetration Onshore • 100 meter below ground level Recommended minimum setting depth
- 25. Eng. El SayedAmer 09 Subsurface Safety Valves applications • The average setting depth for surface-controlled subsurface safety valves is approximately 500 feet. • factors that contribute to this setting depth. 1.hydrate formation 2.paraffins, 3.drilling kick-off points 4.government regulations. Recommended minimum setting depth
- 26. Eng. El SayedAmer
- 27. Eng. El SayedAmer Casing Tubing valve control line TR-SCSSV Annulus valve control line Annulus Safety Valve Concentric tubing anchor Pack-off tubing hanger Integral annulus safety valve Casing Tubing valve control line TR-SCSSV Annulus valve control line Wireline Retrievable Annulus Safety Valve Concentric Tubing Anchor Pack-off tubing hanger Tubing Wire line retrievable annulus safety valve
- 28. Eng. El SayedAmer 127 Self-Equalizing SC-SSSV