Legacy wells are present in most potential CCS fields. In this session, we will discuss issues involved with performing a risk analysis for leakage of legacy wells. While the focus of this session will be on leakage through cement, other potential leak paths will be discussed.

Chairs: David Stiles, ExxonMobil; Tracy Moffett, ExxonMobil

Presentations:

• The Role of Simulation in Assessing Leakage through Legacy Wells
  Deepak Datye, Dassault Systemes
• Considerations for Risk Assessing Legacy Wells on Land
  Marco Troiani, ExxonMobil
• A Screening Framework for Evaluating Legacy Offshore Wells in the Gulf of Mexico for Geologic Carbon Storage
  Gregory Lackey, National Energy Technology Laboratory

In this session we will discuss what options we have for remediation and abandonment of legacy wells once they are identified and assessment for leakage is established, which is covered in the Screening and Risk Analysis for Legacy Well Leakage session. Collection of field data on the history and the current state of wellbores, as well as future plans for the fields, will influence the choice to abandon or repurpose.

Chairs: Luis Padilla, Chevron; Axel-Pierre Bois, XGS Energy

Presentations:

• David Perrin, Chevron
• Cory Arceneaux, Chevron
• Axel-Pierre Bois, XGS Energy

Injecting and storing captured CO2 in subsurface reservoirs requires a thorough understanding of the impact of injected CO2 on cement in purpose-built wells (injection/monitoring) and legacy wells (active, and/or abandoned). This session will provide an overview of the current state of the knowledge of cement/CO2 interactions and the impact to well integrity in storage scenarios. Topics of interest include mechanical and chemical properties of CO2-altered cement, effectiveness of self-sealing behavior, ability of cement to protect the steel casing from corrosion, and thermal impacts of injecting cold CO2 on cement performance. In addition, this session will address future needs to ensure safe and economic storage of CO2.                     

Chairs: Barbara Kutchko, National Energy Technology Laboratory; Maggie Benge, Premier Corex 

Presentations:

• Field Investigation of CO2-Cement Interactions
  Andrew Duguid, Advanced Resources International
• Cement Selection for CO2 Wells
  Glen Benge, Benge Consulting
• Decoding Cement CO2 Interactions: Geochemical Models Illuminate Well Cement Alterations in CCUS Wells
  Sandeep Kumar, Dassault Systemes

This session will cover the unique requirements for cement job designs and isolation evaluation when cementing wells to isolate CO2.

Chairs: Travis Baughman, Oxy; Jeff Long, American Cementing

Presentations:

• Case Study: Exploratory Carbon Capture Well, Challenges, Design, and Execution
  Chad Anton, Denbury; Patrick Hahn, American Cementing
• Case Study: Exploratory Carbon Capture Well, Evaluation, and Lessons Learned
  Josh Alberson, Alberson Cement Consulting Services
• Lessons Learned From Cement Design and Evaluation on First CCUS Well in Gulf of Mexico
  Mohammed Dooply, SLB

This session will investigate the state of the regulatory requirements and solutions to those requirements around cementing in Class VI well applications. This includes both primary cementing of the injection and monitoring wells and the remedial applications for corrective action on existing artificial penetrations.        

Chairs: Andy Ellis, Lonquist; Steve Pattee, Lonquist

Speakers:

• Global CCS Regulatory and Technical Guidance for Legacy Wells
  Salvador Sandoval, ExxonMobil
• CCS Regulatory Update for the State of Texas
  Bryce McKee, Texas Railroad Commission
• CCS Regulatory Update for Several States and Parts of Canada
  Steve Pattee, Lonquist

With CCUS becoming more commercially viable, selection of materials to provide robust annular barriers will be crucial to ensure long term integrity across decades of injection cycles and corrosion. Unlike the standardized testing and analysis practices in place today for oil and gas wells construction, to date, there are no such agreed upon best practices in place for the construction of CCUS wells. This session will review a variety of exposure and analysis techniques to measure and predict permeability, porosity, and mechanical properties of cementitious materials in order to reduce risk and gain alignment within the industry.

Chairs: Misty Rowe-Davis, Halliburton; Brett Dalgety, BP

Presentations:

• Barrier Testing Standards for CO2 Injection Wells
  Sam Lewis, Halliburton
• The Need of Modern Standardization for Oil Well Cements and Their Alternatives
  Cameron Devers, University of Oklahoma
• CO2 Exposure Reactor Test Setup
  Nicolas Droger, SLB

This session will discuss zonal solation for hydrogen wells and challenges to creating a perfect seal for the smallest molecule.

Chairs: Jeff Long, American Cementing; Rick Spaulding, National Energy Technology Laboratory

Presentations:

• Underground Hydrogen Storage: Impact on Cement and Well Integrity
  Barbara Kutchko, National Energy Technology Laboratory
• Discussion Period

For this session, the workshop participants will be split into approximately seven small groups. Each group will be assigned a topic that has been captured during the Workshop. The objective will be to brainstorm ideas and evaluate possible solutions. The deliverable will be to present a suggested path forward for each topic. Each group will present their conclusions to the audience, with the possibility for additional discussion.

Chairs: Axel-Pierre Bois, XGS Energy; David Stiles, ExxonMobil; Luis Padilla, Chevron