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SC-10 Subcommittee on Well Cements: Triaxial Mechanical Properties Testing of Oilwell Cements, 2017 Summer Meeting Progr

This progress report provides an update on the activities and test results of the SC-10 subcommittee on well cements. The report focuses on the triaxial mechanical properties testing of oilwell cements, including test data collection and analysis. The report also discusses the impact of mechanical properties on cement mechanical integrity modeling.

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SC-10 Subcommittee on Well Cements: Triaxial Mechanical Properties Testing of Oilwell Cements, 2017 Summer Meeting Progr

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  1. API Subcommittee on Well Cements (SC-10) Triaxial Mechanical Properties Testing of Oilwell Cements 2017 Summer Meeting Progress Report

  2. Today • Workgroup charge • Members • Year to date activities review • Discussion

  3. Workgroup Charge • Investigate and develop a technical report on the characterization of the mechanical behavior of cement under confinement • Workgroup deliverable “Submit a standardized process to be incorporated into the existing TR related to “Mechanical Behavior of Cement” by 2018 Winter Meeting.”

  4. WorkGroup Members

  5. 2017 WG Activities To Date • Phase 1 testing program • Test data collection and analysis

  6. Mechanical Testing Program – Phase 1 • Curing Temperature = 50 deg. C • Curing Pressure = 3000 psi • Curing Time = 14 days • Temperature and pressure to be reduced over a 72 hour period to minimize induced stress on the samples. • Confining Pressures • All Labs are to test using the following confining pressures • 250 psi, 500 psi, and 1000 psi. • Test Specimens should adhere to a 2:1 ratio (length to diameter)

  7. Mechanical Testing Program – Phase 1 • Labs are to follow their established testing procedures • All labs have the freedom to add additional confining pressures beyond the three required pressures stated above. Tests results can be submitted as well. • All tests will be tested under a “drained condition”. • Labs have freedom to test under an “un-drained condition” as well and test results can be submitted • Phase 1 Testing Deadline: April 01, 2017

  8. Phase 1 Testing Program Summary • Targeted Phase 1 completion April 01, 2017 was not achieved • Delay releasing final cement design • All companies reported extensive use of triaxial load frames to support business units • 8 labs participating • 4 Service Companies • 3 Technology Companies • 1 Major Operator • Phase 1 testing extended to June 30, 3017 to give all labs time to complete and submit tests.

  9. Phase 1 Testing Program Summary • To date 23 data sets have been received • Expect 5 additional data sets by end of June • Phase 1 Data Received (slides 9-14)

  10. Summary of all submitted data

  11. Test Results Averages MECHANICAL PROPERTIES PRESSURE REGIMES

  12. Young’s Modulus All Data Points Avg. + 10% Avg. = 3.064 Avg.-10%

  13. Poisson’s Ratio All Data Points Avg.-10% Avg. + 10% Avg. = 0.220

  14. U.C.S All Data Points Avg. + 10% Avg. = 11,847 Avg. -10%

  15. Data compared to averages

  16. Is a +/-10% Difference in Cement Mechanical Properties Significant? Cement Mechanical Integrity (CMI) Modeling was performed using a standard well architecture, standard well events, and changes in cement mechanical properties • #1 Base Case cement mechanical properties • #2 Reduction of 10% of mechanical properties • #3 Increase of 10% of mechanical properties

  17. Example Well:Well Architecture & Cement Properties

  18. Example Well:Fluids Positions and Well Temp,

  19. Example Well:Operational Events

  20. Base Case – Micro Annulus Inner Micro Annuli (Cement to Casing) Outer Micro Annuli (Cement to Formation) Well Events Well Events

  21. Base CaseShear Failure & Radial Cracking Shear Failure Radial Cracking Well Events Well Events

  22. Base CaseDisking Failure Well Events

  23. CMI Sensitivity ModelingYoung’s Modulus Changes Only

  24. Young’s Modulus Sensitivity Cement to Casing Micro-Annulus Base Case E=9 E=10 E=11 Minimum Effect

  25. Young’s Modulus Sensitivity Cement to Formation Micro-Annulus Base Case E=9 E=10 E=11 Minimum Effect

  26. Young’s Modulus Sensitivity Shear Failure Base Case E=9 E=10 E=11 Strong Effect

  27. Young’s Modulus Sensitivity Radial Cracking Base Case E=9 E=10 E=11 Strong Effect

  28. Young’s Modulus Sensitivity Disking Failure E=9 E=10 E=11 Strong Effect

  29. Is a +/-10% Difference in Cement Mechanical Properties Significant? • Initial CMI modeling indicates that a 10% change in mechanical properties can affect simulation results • Additional CMI modeling is needed to further quantify simulation effects

  30. Going forward

  31. Summary • Phase 1 testing has required more time than anticipated • 2018 Winter meeting deliverable will not be achieved • WG requesting deliverable extension to 2019 Winter meeting • Discussion and Questions

  32. QUESTIONS AND DISCUSION

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