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

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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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

Planned Cement Location

Cement Barrier Placement

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Cement Evaluation and Conclusions

• 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

Negative Pressure Test- Annual Preventer Failed to Seal

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Negative Pressure Test- Spacer Fluid in Kill Line

Report

Misinterpreted Negative Press Test Results

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

Report

Hydrocarbons Entering Well

Report

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Mud Gas Separator

Report

Well Control Response

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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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

Actions To Prevent Recurrence

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Recommendations

Report

Summary of Recommendations

(DWOP and OMS)

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

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

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