1 / 27

Dual Casing Running for deep water spud in

Dual Casing Running for deep water spud in. Presentation. Focusing the issue Deep water operation: Riserless top hole section Deep Water Dual Casing: MAIN PHASES OPTIONS REQUIRMENTS Applications Conclusions. Deep water activities: extreme environment

nico
Download Presentation

Dual Casing Running for deep water spud in

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Dual Casing Runningfor deep water spud in

  2. Presentation • Focusing the issue • Deep water operation: Riserless top hole section • Deep Water Dual Casing: MAIN PHASES • OPTIONS • REQUIRMENTS • Applications • Conclusions

  3. Deep water activities: • extreme environment • heavy load conditions with unconsolidated sea bed • high daily spread rate The improvement of operations with the aim to increase the efficiency can produce a time reduction and as consequence a cost saving

  4. Conventional technique Jetting & Drill-Ahead • Drill 36” hole • Run and cement • 30” CP • Drill 26” hole • Run and cement • 20” csg • Jet 30” CP and • drill 26” hole • Run and cement • 20”csg

  5. Traditional techniques – CONSTRAINS: • uncertainty about the formation to cross • perfect verticality of WH and correct stick up • not granted Deep Water Dual Casing

  6. Conventional technique Jetting & Drill-Ahead Deep Water Dual Casing • Drill 36” hole • Run and cement • 30” CP • Drill 26” hole • Run and cement • 20” csg • Jet 30” CP and • drill 26”or 23” • Run and cement • 20”csg • Drill 23” x 36” hole with HO in tandem • Run and cement 30” CP and 20” csg • 1 jetting phase • 1 drilling phase • 1 cementing job • 2 round trips • 1 drilling phase • 1 cementing job • 2 round trips • 2 drilling phases • 2 cementing jobs • 4 round trips

  7. Drill 23” or 17 1/2” hole No Rotation by using straight hole drilling device and motor

  8. Drill 23” or 17 1/2” hole Start Rotation for 42” or 36” Hole

  9. Drill 23”or 17 1/2” hole + 42” or 36” hole With Rotation for 36”/42” Hole The hole inclination approximately 0° (zero degree)

  10. End of 23” or 17-1/2” hole + 42” or 36” hole POOH

  11. 36” or 42” hole + 23” or 17 1/2” hole

  12. Ready to Run: Combination 36” or 30” C.P. + 20” csg or 20”+13 3/8” Tapered csg

  13. MS 700 Wellhead SystemsGuidelineless Type Drilling System without Guide structure Cement Port Low-pressure Housing Lowered into Mud Mat Hydrate Gas Seals Shown with mud mat & ball valve

  14. CART 18” 3/4 DA COMPLETARE Housing 18” 3/4 Housing 30” • Standard cement • DeepCRETE • Foam cement Mud Mat Casing 20” Conductor pipe 30” 36” Hole Casing 13 3/8” Inner string DP 5” 17 1/2” Hole

  15. Case History ENI Angola 1 Job: 30”x20”x13 3/8” Casing 2 Jobs: 30”x20” Casing

  16. ANGOLA OFFSHORE – CASE HISTORY # 1: Standard cement WD: 1300 m; Sea-bed temperature: 4 °C Shallow water risk: no Cement job: 30” C.P.x 20” x 13 3/8” tapered combined string Lead slurry: 1.44sg (12ppg) LiteFIL Tail slurry: 1.90sg (15.9ppg) Displacement: no cement returns at seabed WOC: 13 hrs Slack-off: casing string unstable WOC: additional 6 hrs Slack-off: OK Top job: cement job performed to ensure cement to sea bed

  17. ANGOLA OFFSHORE – CASE HISTORY # 2: DeepCRETE Cement WD: 500 m; Sea-bed temperature: 6 °C Shallow water risk: yes Cement job: 30” C.P. x 20” casing Lead slurry: 1.20sg (10ppg) DeepCRETE with D500 GASBLOK Tail slurry: 1.90sg (15.9ppg) with D500 GASBLOK Displacement: returns at seabed WOC: 15 hrs Slack-off: casing string 1 cm “sink” WOC: additional 3 hrs Slack-off: OK Top job: no top job performed

  18. ANGOLA OFFSHORE – CASE HISTORY # 3: Foam Cement WD: 1070 m; Sea-bed temperature: 5 °C Shallow water risk: no Cement job: 30” C.P. x 20” casing Lead slurry: 1.25sg (10.4ppg) Foam cement Tail slurry: 1.90sg (15.9ppg) Displacement: partial returns at seabed WOC: 15 hrs Slack-off: OK Top job: no top job performed

  19. CART 18” 3/4 Housing 18” 3/4 Housing 30” Mud Mat Casing 20” 36” Hole Conductor pipe 30” Casing 13 3/8” Inner string DP 5” 17 1/2” Hole Wellhead cut and retrieved Annulus 20” - 30”

  20. 3 different options: • M/U C.P. and surf. csg during flat time and hang up them on Moon Pool trolley • M/U C.P. during flat time but surface casing on line after drilling tapered hole • M/U C.P. and surf. csg on line after drilling tapered hole

  21. Requirements for full application: • VDL to load spud in materials • Motion compensator capability • Moon pool trolley capacity > (C.P.+surface csg+inner string) weight w/S.F. • Distance moon pool – sea bed > lenght of surface casing

  22. If all requirements are NOT fully satisfied: • Partial time saving but all other advantages are exploited: • no C.P. sinking can occur • housing pre-fixed stick up and verticality near to 0° is granted • applicability in all lithology types • latch between LP and HPWH Housing performed at surface, ensuring mechanical structural integrity

  23. Dual Activity rig:

  24. Drill 8 ½” P.H. • M/U 36” C.P. • Run BOP • Drill 23”x42” hole • Run BOP • Run Dual csg string • Run BOP • Cementing op.

  25. Operating time during riserless phase (drilling pilot hole and running BOP not included)

  26. Deep water Dual Casing, a patented technology, is the most efficiency alternative to conventional techniques. • Advantages: • Hole inclination approximately 0 deg • Reduction of risk assessment in C.P. setting for unknown lithology • No subsidence events • Top Cement Job feasibility • LP HSG and HP HSG latch performed at surface • Time reduction • Constrain: • Water depth longer than surface casing setting depth (Reduction of system efficiency) • Rig technical characteristics • If shallow hazard phenomena imposes the use of 26” intermediate casing (36” LP HSG & CP)

More Related