WELLHEAD FOR OIL AND GAS WELL.pptx

Wellhead For Oil and Gas Well

1. Wellheads

2. 1. Tubing (perforated) 2. Casing 3. Annular seal 4. Wellhead 5. Tubing suspension 6. Master valve 7. Master valve 8. Upper valve 9. Wing valve 10. Flow bean 11. To manifold 12. Operator 13. Hand wheel 14. Pressure gage 15. Annular space outlet valve 16. Cellar Sumur Produksi Penyelesaian sumur meliputi pemasangan casing dan rangkaian pipa produksi , serta mengupayakan agar cairan dapat mengalir ke permukaan , dimana dipasang kepala sumur lengkap dengan Christmas tree. Christmas tree merupakan sekumpulan valve, alat ukur tekanan , penyangga tubing, dll .

3. 3 What is a wellhead ? The wellhead is the surface foundation on which the well is built up during the drilling operations and the base for the Xmas tree for production operations.

4. 4 Wellheads - Drilling During drilling process : The well is controlled by a BOP and choke manifold As the well is drilled : Each annulus is sealed off by the wellhead

5. 5 Wellheads - Completed well Xmas Tree The BOP's are removed After the tubing is installed : The Christmas tree is installed to control the flow from the well Wellhead

6. 6 Wellhead systems must be designed to : Withstand tensile loads of suspended tubulars 1 2 Provide a pressure sealing capability ISOLATE the well from the external environment ISOLATE between casings and downhole formations MAINTAIN PRESSURE during well control operations, well testing or shut in periods. Life of Well Drilling Production Workover Suspension Abandonment

7. 7 What does a wellhead do ? HANG-OFF WEIGHT 1 2 3 4 CONTAINS PRESSURE MONITOR THE WELL SAFETY PROVIDE A BASE FOR THE XMAS TREE

8. Surface Wellheads

9. 9 Conventional spooled system Casing Head Housing Casing Head Spool Tubing Head Spool BOP Stack

10. 10 What are the main components ? Casing Head Housing Casing Head Spool Tubing Head Spool Xmas Tree

11. 11 Surface Wellhead schematic Medium cost spool system

12. 12 Casing Head Housing First element of the wellhead

13. 13 Casing Head Housing - Functions It is normally connected to the surface casing Supports the next string of casing Provides connection to the BOP and together with it can: Seal the wellbore (from the atmosphere) Control access to the wellbore : for pressure control or fluid returns during drilling operations.

14. 14 Casing Head Housing - Description Slip-on weld or threaded bottom connection Test port Side outlets threaded or studded Top connection flanged (standard) Ring groove Landing area for Casing Hanger

15. 15 Starter Head Threaded onto surface casing Can provide a landing plate to sit on the conductor Internal profile for next casing string

16. 16 CHH - Bottom Connection Slip-on weld bottom connection (standard) Threaded bottom connection

17. 17 Starter Head options Top connection Tie-down bolts To hold in a wear bushing To activate seals around next casing

18. 18 CHH - Base Plate The casing head may be used in conjunction with a base plate for more effective weight distribution. Conductor pipe Surface casing Cellar

19. 19 What happens after installing the Casing Head Housing ? Nipple up and test BOPs Install wear bushing. The next hole section is drilled. The intermediate casing is run in the hole and is cemented. P/U BOPs A rough cut is performed to allow retrieving remaining casing and removing BOPs

20. 20 Casing hung on Casing Hanger Housing

21. 21 Casing Hangers - Functions Suspends intermediate or production casing string Centres the casing string in the head (or spool) Seals off the casing annulus. ( It is the primary seal )

22. 22 Starter Head summary

23. 23 Casing Hangers

24. 24 Casing Hangers

25. 25 Casing Hangers

26. 26 Casing Hangers

27. 27 Casing Head Spools Second element of the wellhead Normally not threaded as pressures higher Eg >3000psi.

28. 28 Next Section is Installed Casing Spool

29. 29 Casing Head Spools - Functions Seals off (packs off) surface casing string Provides support (landing bowl) for next casing string Provides support for well control equipment (BOP Stack) Sealing the wellbore (from the atmosphere) Controlling access to the wellbore : for pressure control or fluid returns during drilling operations.

30. 30 Casing Head Spools - Description Pack Off or Secondary Seal. Designed to fit around OD of current casing Test port Side outlets threaded or studded / flanged (threaded not common) Top connection flanged (standard) Ring groove Landing area for Casing Hanger Bottom connection compatible with the top connection on the previous casing head or spool

31. 31 Casing Head Spools - Description LOCK SCREW (not very common) PRIMARY LOAD SHOULDER VALVE REMOVAL PLUG THREADS SEALANT INJECTION PORT TEST PORT

32. 32 What Seals Pressure Between Flanges ? Achieved using API ring gaskets

33. 33 What happens after installing the Casing Spool Housing ? Nipple up and test BOPs Install wear bushing. The next hole section is drilled. The intermediate/Production casing is run in the hole and is cemented. P/U BOPs A rough cut is performed to allow retrieving remaining casing and removing BOPs. Casing Hanger is installed

34. 34 Casing Hangers Intermediate or Production Casing Landing area

35. 35 Casing Pack-offs Fits inside the lower flange of the casing spool

36. 36 Casing Pack-offs Fits inside the lower flange of the casing spool

37. 37 Casing Pack-offs Fits inside the lower flange of the casing spool

38. 38 Casing Spools summary

39. 39 Tubing Head Spools Third element of the wellhead

40. 40 Tubing Head Spools - Functions Seals off (packs off) production casing string Provides support and lockdown for tubing hanger Provides support for the BOP Stack

41. 41 Tubing Head Spools - Description TUBING HANGER LOCK DOWN BOLT TOP BOWL FOR TUBING HANGER VALVE REMOVAL PLUG THREADS TEST PORT Pack off designed to fit around OD of production casing

42. 42 Tubing Hangers Tubing Production casing Tubing Head Spool Tubing Hanger Tubing Hanger Tubing Head Spool Tubing Bonnet

43. 43 Tubing Hangers Functions Suspends the tubing Seals off the annulus Provides a seat for a back pressure valve (BPV) that can be temporally installed allowing the BOP stack or X-mas tree to be removed

44. 44 Tubing Head Tubing hangs in this spool Tubing hanger will be proud of the top flange

45. 45 Tubing Head options Will accept a casing pack-off at the lower flange

46. 46 Dual Tubing Head Locator pins to orient the dual hanger

47. 47 Tubing Hanger

48. 48 Tubing Heads summary

49. 49 Tubing Bonnet Seats over the tubing hanger neck Xmas tree on top of this