Presentation is loading. Please wait.

Presentation is loading. Please wait.

www.eni.it Dual Casing Running for deep water spud in.

Similar presentations


Presentation on theme: "www.eni.it Dual Casing Running for deep water spud in."— Presentation transcript:

1

2 Dual Casing Running for deep water spud in

3 2 Focusing the issue Deep water operation: Riserless top hole section Deep Water Dual Casing: MAIN PHASES OPTIONS REQUIRMENTS Applications Conclusions Presentation

4 Dual Casing Running for deep water spud in 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

5 Dual Casing Running for deep water spud in 4 Conventional technique Drill 36 hole Drill 36 hole Run and cement Run and cement 30 CP 30 CP Drill 26 hole Drill 26 hole Run and cement Run and cement 20 csg 20 csg Jetting & Drill-Ahead Jet 30 CP and Jet 30 CP and drill 26 hole drill 26 hole Run and cement Run and cement 20csg 20csg

6 Dual Casing Running for deep water spud in 5 Traditional techniques – CONSTRAINS: uncertainty about the formation to cross perfect verticality of WH and correct stick up not granted Deep Water Dual Casing

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

8 Dual Casing Running for deep water spud in 7 Drill 23 or 17 1/2 hole No Rotation by using straight hole drilling device and motor

9 Dual Casing Running for deep water spud in 8 Start Rotation for 42 or 36 Hole Drill 23 or 17 1/2 hole

10 Dual Casing Running for deep water spud in 9 The hole inclination approximately 0° (zero degree) Drill 23or 17 1/2 hole + 42 or 36 hole With Rotation for 36/42 Hole

11 Dual Casing Running for deep water spud in 10 End of 23 or 17-1/2 hole + 42 or 36 hole POOH

12 Dual Casing Running for deep water spud in or 42 hole + 23 or 17 1/2 hole

13 Dual Casing Running for deep water spud in 12 Ready to Run: Combination 36 or 30 C.P csg or /8 Tapered csg

14 Dual Casing Running for deep water spud in 13 Shown with mud mat & ball valve MS 700 Wellhead Systems Guidelineless Type Drilling System without Guide structure Hydrate Gas Seals Low-pressure Housing Lowered into Mud Mat Cement Port

15 Dual Casing Running for deep water spud in 14 DA COMPLETARE Inner string DP 5 Casing 13 3/8 Conductor pipe 30 Casing Hole Housing 30 Housing 18 3/4 Mud Mat CART 18 3/4 17 1/2 Hole Standard cement Standard cement DeepCRETE DeepCRETE Foam cement Foam cement

16 Dual Casing Running for deep water spud in 15 Case History ENI Angola 1 Job: 30x20x13 3/8 Casing 2 Jobs: 30x20 Casing

17 Dual Casing Running for deep water spud in 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

18 Dual Casing Running for deep water spud in 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

19 Dual Casing Running for deep water spud in 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

20 Dual Casing Running for deep water spud in 19

21 Dual Casing Running for deep water spud in 20 Inner string DP 5 Casing 13 3/8 Conductor pipe 30 Casing /2 Hole 36 Hole Housing 30 Housing 18 3/4 CART 18 3/4 Mud Mat Wellhead cut and retrieved Annulus

22 Dual Casing Running for deep water spud in 21 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

23 Dual Casing Running for deep water spud in 22 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 Requirements for full application:

24 Dual Casing Running for deep water spud in 23 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

25 Dual Casing Running for deep water spud in 24 Dual Activity rig:

26 Dual Casing Running for deep water spud in 25 - Drill 8 ½ P.H. - M/U 36 C.P. - Run BOP - Drill 23x42 hole - Run BOP - Run Dual csg string - Run BOP - Cementing op.

27 Dual Casing Running for deep water spud in 26 Operating time during riserless phase (drilling pilot hole and running BOP not included)

28 Dual Casing Running for deep water spud in 27 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)


Download ppt "www.eni.it Dual Casing Running for deep water spud in."

Similar presentations


Ads by Google