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When Rocks Stop Leaks: Geological Barriers In Well Integrity

Recorded On: 01/24/2018

Annular isolation is a fundamental aspect of well integrity, the discipline that aims to keep well fluids under control. This is particularly true when wells are abandoned and we need to prevent leaks for a very long time: requirements to log and fix defects clash with time and budget constraints.

Flow from permeable formations is prevented (and mitigated) through the use of barriers. Traditionally the separation of roles between natural and man-made barriers has been clear cut: once the original impermeable caprock has been pierced by drilling, the annulus must be isolated by pumping cement.

However this simple picture has evolved through the recognition that some rocks can also act as annular barriers. Creeping formations such as halides, mudstones and possibly ice can seal uncemented sections and large defects in the cement sheath. More importantly, the radial stress they exert reduces debonding and the barrier heals itself again and again, making it robust.

If creeping formations are to become a fundamental element in well design and evaluation, they need to be properly understood and modeled. From an engineering point of view, we need answers to three questions: how can we recognize a geological barrier? How hard it will grip casing and cement, and how fast can it bridge a gap? How will it fail, and how much can leak past it? This presentation will review what we know and try to answer these questions so we can truly "engineer" geological barriers and achieve effective and robust well integrity.

Matteo Loizzo

Well Integrity Consultant/Trainer

Mr. Loizzo provides technical and process consulting to operators and service companies, helping them extract value from well integrity. His previous career with Schlumberger spanned field operations, research & development, QHSE and carbon dioxide (CO2) geological storage. His current research interests include harnessing geological barriers, modeling leaks through cement, risk management and methane emissions from oil & gas wells. Loizzo has authored and/or coauthored 29 technical papers, a book chapter on CO2 geological storage and 7 patent applications. He holds an master’s degree in aerospace engineering from Rome university “La Sapienza”, Italy and is a member of SPE. Mr. Loizzo is also the incoming Membership Chair of SPE’s Well Integrity Technical Section.

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01/24/2018 at 9:30 AM (EST)   |  90 minutes
01/24/2018 at 9:30 AM (EST)   |  90 minutes
Certificate
0.15 CEU/1.5 PDH credits  |  Certificate available
0.15 CEU/1.5 PDH credits  |  Certificate available