10.1-1

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4/3/2012. 10.1-2. Outline. Deep Water Blowouts and BridgingWellbore Bridging ModelBridging ScenariosCurrent ActivityConclusions. 4/3/2012. 10.1-3. Deep Water Blowouts. FOR MORE INFO.... Flak L.: ?Control of Well Issues", ?Marine Insurance ? Facing the Changed World", International Union of Mari

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10.1-1

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1. 4/4/2012 10.1-1

2. 4/4/2012 10.1-2 Outline Deep Water Blowouts and Bridging Wellbore Bridging Model Bridging Scenarios Current Activity Conclusions Brief outline where this presentation comes from.Brief outline where this presentation comes from.

3. 4/4/2012 10.1-3 Deep Water Blowouts

4. 4/4/2012 10.1-4 Deep Water Blowouts

5. 4/4/2012 10.1-5 Fastest and Least Expensive Skalle : Bridging is the most common method of blowout control in OCS (39.6%). Flak : Natural well bridging would shut off most blowouts. Adams and Kuhlman : Formation bridging is responsible for stopping many shallow blowouts. Skalle : Bridging is the most common method of blowout control in OCS (39.6%). Flak : Natural well bridging would shut off most blowouts. Adams and Kuhlman : Formation bridging is responsible for stopping many shallow blowouts.

6. 4/4/2012 10.1-6 Bridging Models

7. 4/4/2012 10.1-7

8. 4/4/2012 10.1-8 Model Concept

9. 4/4/2012 10.1-9 Model Concept

10. 4/4/2012 10.1-10

11. 4/4/2012 10.1-11

12. 4/4/2012 10.1-12 The plot on the left is one of the outputs from the model. The Blue line is the inflow performance curve at low drawdown. If the formation is instable and flows into the wellbore, it may or may not bridge. If the outflow performance with the produced volume of formation shown in red is completely above the reservoir performance curve a bridge will form. This is because more solids are being produced into the wellbore than the formation fluids can remove from the wellbore. The solids will accumulate and eventually bridge, stopping flow.The plot on the left is one of the outputs from the model. The Blue line is the inflow performance curve at low drawdown. If the formation is instable and flows into the wellbore, it may or may not bridge. If the outflow performance with the produced volume of formation shown in red is completely above the reservoir performance curve a bridge will form. This is because more solids are being produced into the wellbore than the formation fluids can remove from the wellbore. The solids will accumulate and eventually bridge, stopping flow.

13. 4/4/2012 10.1-13 Here are sub-routines for the model.Here are sub-routines for the model.

14. 4/4/2012 10.1-14

15. 4/4/2012 10.1-15

16. 4/4/2012 10.1-16 Here are the required input for IPRHere are the required input for IPR

17. 4/4/2012 10.1-17 Input for outflow.Input for outflow.

18. 4/4/2012 10.1-18 Here the model plots flow rate, and pressure distribution along the well. Here the model plots flow rate, and pressure distribution along the well.

19. 4/4/2012 10.1-19 FEA Subroutines

20. 4/4/2012 10.1-20 FEA Inputs for the FEA preprocessor. On the left is an example of the output plots.Inputs for the FEA preprocessor. On the left is an example of the output plots.

21. 4/4/2012 10.1-21

22. 4/4/2012 10.1-22 Here is a flow chart showing how all the subroutines link together. Each step will be discussed separately.Here is a flow chart showing how all the subroutines link together. Each step will be discussed separately.

23. 4/4/2012 10.1-23 1. Well is out of Control Since this is predominantly a blowout model at this point, we will assume the well is flowing out of control. However, the model can also be used as a borehole stability model for UBO.Since this is predominantly a blowout model at this point, we will assume the well is flowing out of control. However, the model can also be used as a borehole stability model for UBO.

24. 4/4/2012 10.1-24 2. Wellbore Instability Stress strength relations are calculated, and solid production potential is calculated from the wellbore stability model.Stress strength relations are calculated, and solid production potential is calculated from the wellbore stability model.

25. 4/4/2012 10.1-25 3. Solid Production Solid production potential and actual solid production are calculated and plotted.Solid production potential and actual solid production are calculated and plotted.

26. 4/4/2012 10.1-26 4a. Wellbore Collapse The actual solid production calculated is now used to calculate the outflow performance.The actual solid production calculated is now used to calculate the outflow performance.

27. 4/4/2012 10.1-27 4b. Bridge Formation Then the Inflow performance and outflow performance are compared and the model predicts whether a bridge will form or not. The model can also predict how much solids and for how long the solids will be produced.Then the Inflow performance and outflow performance are compared and the model predicts whether a bridge will form or not. The model can also predict how much solids and for how long the solids will be produced.

28. 4/4/2012 10.1-28 5. Bridge Stability In the event that a bridge is formed, the model will predict if an underground blowout or formation fracture below the bridge will occur.In the event that a bridge is formed, the model will predict if an underground blowout or formation fracture below the bridge will occur.

29. 4/4/2012 10.1-29 Deep Water Tendency

30. 4/4/2012 10.1-30

31. 4/4/2012 10.1-31 Numerical Procedure Subroutines Debugging Default FEA Meshes: - clean wellbore; - bridged wellbore; - wellbore bottom. At the current time, we are debugging the software.At the current time, we are debugging the software.

32. 4/4/2012 10.1-32 Testing hollow core samples in a rock properties lab, and comparing the results to the simulator.Testing hollow core samples in a rock properties lab, and comparing the results to the simulator.

33. 4/4/2012 10.1-33 Conclusions

34. 4/4/2012 10.1-34 Conclusions

35. 4/4/2012 10.1-35 Conclusions

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