BOP Testing Best Practices

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Thomas Dalton
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1 BOP Testing Best Practices Ocean Endeavor and Ocean Baroness Andrew Hunter and Derek Ridgway Updated 12/21/08 NYSE: DVN page 1

2 Background & Scope Excessive BOP testing times on Ocean Baroness Consistent performance on Ocean Endeavor What are we doing differently? Review, compare & analyze data Make recommendations & implement Identify Best Practices NYSE: DVN page 2

3 Endeavor Average Hours per Stack Test ~ Entire Jack 3 Well ENDEAVOR - Hours per Stack Test Hours Test Number Protected choke manifold; tests are performed off-line when possible Consistent performance (0.9 hrs/test) NYSE: DVN page 3

4 Baroness Average Hours per Stack Test ~ Bass well to date Hours Baroness - Hours per Stack Test 11/20/ hrs/test 12/12/ hrs/test 6,000 6,000 6,000 10,000 psi 10,000 psi HP test Test Number High Pressure = 10,000 psi on Tests #6 and #7 Excessive time on Test #6 and #7 Why?? NYSE: DVN page 4

5 Preliminary Conclusions Causes of Excessive BOP Test Time on Baroness 1. Unprotected choke manifold; all tests over 10,000 psi must be on-line 2. Inefficient pump operation (see following slides for examples) NYSE: DVN page 5

6 Efficient Pump Operation on Endeavor ~ Test #13 to 9,000 psi on 10/28/08 Endeavor operator bumps pressure 5 times in ±25 minas soon as a rapid decline is noticed More efficient method of compressing synthetic base mud Good test in 35 min NYSE: DVN page 6

Baroness operator waiting too long to bump up pressure Good test in 125 min (over twice as

7 Inefficient Pump Operation on Baroness ~ Test #6 to 10,000 psi on 12/13/08 (1.97 hrs/test) Operator bumps pressure 5 times in ±65 min(half the frequency of Endeavor) Baroness operator waiting too long to bump up pressure Good test in 125 min (over twice as long as Endeavor) Same pattern seen when comparing most high-pressure tests NYSE: DVN page 7

8 Inefficient Pump Operation on Baroness ~ Test #8 to 10,000 psi on 12/14/08 (1.97 hrs / test) As per SLB operator on Endeavor, the 5 min high pressure test could have ended at either noted interval Baroness operator unnecessarily spent ± 55 min NYSE: DVN page 8

pressure test could have ended at the noted interval Baroness

9 Inefficient Pump Operation on Baroness ~ Re-test #9 to 10,000 psi on 12/14/08 As per SLB operator on Endeavor, the 5 min high pressure test could have ended at the noted interval Baroness operator unnecessarily spent ± 40 min NYSE: DVN page 9

10 On-line Test Optimization Comparison of Baroness tests #6 & #7 Hours Baroness - Hours per Stack Test Test Number 11/20/ hrs/test 12/12/ hrs/test Both tests to 10,000 psi using 14.9 ppg SBM At first glance test #6 looks much better than test #7 However, test #7 total time was ~10 hours less than test #6 This was done by combining component testing which reduced the total number of on-line tests performed from 19 to 11. NYSE: DVN page 10

11 Team Recommendations 1. Review each rig s test charts with Baroness Halliburton pump operator & company men 2. Identify unacceptable decline more quickly and bump pressure (±100 psi) more frequently (not an exact science) 3. HES to review test charts with MMS to better understand what makes a good test Note: MMS inspectors are invited to SLB quarterly safety meetings to review test requirements 4. Use water in surface lines and cement unit to minimize compression time 5. Optimize on-line testing. Maximize number of tests performed off-line Combine on-line tests to test multiple components at once Post-job evaluation: Evaluate number of tests performed and time per test to find optimal testing procedure 6. Investigate modifications that would allow for off-line high pressure testing on Baroness 7. Review performance of next BOP test on Baroness (due 12/28/08) 8. Identify Best Practices NYSE: DVN page 11

Contact Information Ocean Baroness Derek.Ridgway@dvn.

com Safety tip of the day: BE SURE TO OPEN RAMS BEFORE POOH

12 Contact Information Ocean Baroness Safety tip of the day: BE SURE TO OPEN RAMS BEFORE POOH Ocean Endeavor NYSE: DVN page 12

1. The well has been shut in on a kick and the kill operation has not started.

Well Control Methods Day 2 1. The well has been shut in on a kick and the kill operation has not started. Shut in drill pipe pressure Shut in casing pressure 500 psi 700 psi After stabilization, both pressures