Deep Water Horizon Accident Investigation Lessons Learned

Deep Water HorizonLessons Learned

A Study of the BP Accident Investigation ReportSeptember 8 , 2010

J. M. Drake P.E. CSP, CQE, F.NSPE

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Deep Water Horizon Accident Investigation Report

Executive Summary


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Investigation Lines of Inquiry Key Events of the Accident Timeline Macondo Well Details, Geology and Well Design 4 Critical Factors Leading up to the Accident 8 Key Findings of the Investigation Estimates of the Total Spill Size Recommendations to Prevent Recurrence

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Presentation Agenda


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Accident Lines of Inquiry

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Critical Factors of the Accident

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I.

II.

III.

IV.

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Details of Macondo Well


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Geology and Well Design


First Key Finding of Investigation

The annual cement barrier did not isolate the hydrocarbons

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Report

Actual Macondo Well Casing Runs


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Planned Cement Location


Cement Barrier Placement


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Cement Evaluation and Conclusions


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• A Cement Bond Log was not run to evaluate the cement job

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Potential Flow Paths


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Shoe Track Cement Failure Modes


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Float Collar Failure Modes


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Negative Pressure Test- Annual Preventer Failed to Seal


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Negative Pressure Test- Spacer Fluid in Kill Line


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Report

Misinterpreted Negative Press Test Results


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Test success/fail criteria not specified


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Inflow Not Recognized


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Inflow not Recognized

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Increasing Pressure During Sheen Test


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Report

Hydrocarbons Entering Well


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Report


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Mud Gas Separator


Report

Well Control Response


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Cumulative Hydrocarbon Inflow Last Hour


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Preventable Accident


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Key Finding 6


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Time Line- Final Ten MinutesApril 20, 2010


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Predicted Flow Modeling- Time to Well Control


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Report

Possible Gas Release Locations


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Mud Gas Separator Vent Lines


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Gas Dispersion Modeling


Overview- Hydrocarbon Ignition Analysis


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Blast and Resulting Fire


Report


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BOP Well Control Modes


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BOP Annular Well Control


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Following Explosion BOP Control Lost


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BOP Rams Positions


Report

BOP Control System Failures


BOP Critical Faults-Yellow Solenoid- Blue Battery Pack


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BOP Hydraulic Leak


Report

Drill Pipe Configuration over Time


Report

Condition of Riser After Retrieval


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BOP Conclusions

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I.

II.

III.

IV.


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Flow Rate Technical Group◦ Estimated flow rates 15,000 to 40,000 brls/day

95% Confidence Interval Calculations based on the duration and flow

rates yield total spill size◦ Between 1.3 to 3.5 MMB (million barrels of oil)◦ Published media articles (NY Time and CNN) place

values between 4.1 and 4.3 MMB Ranks between the fifth to tenth largest

crude oil spills in the world

Estimates of Total Spill Size


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Actions To Prevent Recurrence

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Recommendations


Report


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Summary of Recommendations

(DWOP and OMS)


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Topics Covered: Investigation Lines of Inquiry Critical Events during the Accident Timeline Macondo Well Details, Geology and Well Design 4 Critical Factors, Lines of Inquiry, Leading up to the Accident 8 Key Findings of the Investigation Estimates of Size of Spill Recommendations of Actions to Prevent Recurrence

This study clearly demonstrates that the Deep Water Horizon accident was preventable.

With sound application of engineering and safety practices, similar accidents need never occur again.

Concluding Remarks


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Comments and Questions


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1. BP Deepwater Horizon Macondo Well Accident Report Page:http://www.bp.com/sectiongenericarticle.do?categoryId=9034902&contentId=7064891

2. Wikipedia ,Timeline, Deep Water Horizon Accident:http://en.wikipedia.org/wiki/Timeline_of_the_Deepwater_Horizon_oil_spill#Aprilhttp://en.wikipedia.org/wiki/Deepwater_Horizon_explosionhttp://en.wikipedia.org/wiki/Deepwater_Horizon

3. Wall Street Journal:http://online.wsj.com/article/SB10001424052748704302304575213883555525958.html

4. CNN:http://www.cnn.com/2010/US/05/03/timeline.gulf.spill/index.html?iref=obnetwork

5. Times Picayune:http://www.nola.com/news/gulf-oil-spill/index.ssf/2010/08/graphic_brings_together_multip.htmlhttp://media.nola.com/2010_gulf_oil_spill/photo/six-steps-that-doomed-the-rigjpg-bd73481b6f076ab0.jpg

6. Offshore Technology:http://www.offshore-technology.com/features/feature84446/

7. Energy and Commerce Committee U.S. Congress:

http://energycommerce.house.gov/index.php?option=com_content&view=article&id=1985:energy-a-commerce-committee-investigates-deepwater-

horizon-rig-oil-spill&catid=122:media-advisories&Itemid=55

8. Bureau of Ocean Energy Managementhttp://www.boemre.gov/deepwaterreadingroom/QuestionDocuments.aspx http://www.boemre.gov/DeepwaterHorizon.htm

9. Deep Water Response Unified Commandhttp://www.deepwaterhorizonresponse.com/go/site/2931/

References and Credits

http://www.bp.com/sectiongenericarticle.do?categoryId=9034902&contentId=7064891

http://www.google.com/url?q=http://en.wikipedia.org/wiki/Timeline_of_the_Deepwater_Horizon_oil_spill#April&sa=D&sntz=1&usg=AFQjCNHUZM-KCU8sguF0L-Mu-72WjsmKAg

http://www.google.com/url?q=http://en.wikipedia.org/wiki/Deepwater_Horizon_explosion&sa=D&sntz=1&usg=AFQjCNERB8Lqc34RW79GHKaoL4C3c3dCHA

http://www.google.com/url?q=http://en.wikipedia.org/wiki/Deepwater_Horizon&sa=D&sntz=1&usg=AFQjCNG-esd7AnH1lTPspku720yOsW5LCQ

http://www.google.com/url?q=http://online.wsj.com/article/SB10001424052748704302304575213883555525958.html&sa=D&sntz=1&usg=AFQjCNGfoyCVCjEXT79WyyOUgxdLJ64jsQ

http://www.google.com/url?q=http://www.cnn.com/2010/US/05/03/timeline.gulf.spill/index.html?iref=obnetwork&sa=D&sntz=1&usg=AFQjCNG_dhTp9XCaNUAo3ZORL9dJtMDrGQ

http://www.google.com/url?q=http://www.nola.com/news/gulf-oil-spill/index.ssf/2010/08/graphic_brings_together_multip.html&sa=D&sntz=1&usg=AFQjCNHQuYR8TwL12GkhWi8plR-uE9OCJA

http://www.google.com/url?q=http://media.nola.com/2010_gulf_oil_spill/photo/six-steps-that-doomed-the-rigjpg-bd73481b6f076ab0.jpg&sa=D&sntz=1&usg=AFQjCNEWGt79SuunNqegcglRjsYcF38liA

http://www.offshore-technology.com/features/feature84446/

http://energycommerce.house.gov/index.php?option=com_content&view=article&id=1985:energy-a-commerce-committee-investigates-deepwater-horizon-rig-oil-spill&catid=122:media-advisories&Itemid=55


http://www.boemre.gov/deepwaterreadingroom/QuestionDocuments.aspx


http://www.boemre.gov/DeepwaterHorizon.htm


http://www.deepwaterhorizonresponse.com/go/site/2931/

http://www.boemre.gov/DeepwaterHorizon.htm

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Deep Water Horizon Accident Investigation Lessons Learned