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Geomechanical Assessment of Leakage through Oil Wellbores Open Access


Other title
Carbon Capture and Storage
Wellbore Leakage
Cement Hydration
Maturity Rule
Wellbore Efficiency
Wellbore Permeability
Wellbore Integrity
Type of item
Degree grantor
University of Alberta
Author or creator
Alsayed, Ahmad Nabih A.
Supervisor and department
Chalaturnyk, Rick (Civil and Environmental Engineering, University of Alberta)
Examining committee member and department
Hendry, Michael (Civil and Environmental Engineering, University of Alberta)
Sego, David (Civil and Environmental Engineering, University of Alberta)
Nygaard, Runar (Petroleum Engineering, Missouri University of Science and Technology)
Kumar, Aloke (Mechanical Engineering, University of Alberta)
Schmitt, Doug (Physics, University of Alberta)
Department of Civil and Environmental Engineering
Geotechnical Engineering
Date accepted
Graduation date
Doctor of Philosophy
Degree level
Carbon capture and storage (CCS) is an approach to reduce carbon dioxide (CO2) emissions. The approach involves three main steps; capturing, transporting, and storing of CO2. Storing is done by injecting CO2 directly into underground deep geological formations such as depleted oil and gas reservoirs, un-minable coal seams, saline formations, and declining oil and gas reservoirs. Safe storage of CO2 into oil and gas reservoirs depends mainly on the caprock sealing that provide a physical natural barrier for leakage to the surface and/or a strata where other energy, mineral and/or groundwater resources are present. Storage integrity assurance is controlled by two mechanisms; geological leakage mechanism and wellbore leakage mechanism. In all problems, dealing with CCS, safety assessment of wellbore integrity is a major challenge. Researchers’ main objective is to gain more information and knowledge to understand wellbore behavior under different states and/or conditions. However, all of these efforts are scattered and dispersed due to either the various approaches of the study and the multi-disciplinary nature of the problem. There is no unified and universally accepted procedure to investigate wellbore leakage mechanism. There is a need for a methodology to standardize the assessment of wellbore integrity in a more regulatory manner. To be a standard code of practice, key elements of the methodology must be gathered, recognized, classified, and systematically ordered. Such considerations necessitate an appropriate procedure that can be standardized and considered as a sound practical tool to check the safety evaluation of wellbores with respect to wellbore leakage mechanism. Wellbore sealing efficiency index is introduced to assess wellbore leakage mechanism with engineering rigor. It can be used as a quantification index to assess wellbore leakage failure mechanism. The index is proposed to be a criterion to rank different wellbore elements in the same formation, to compare with different elements within the same wellbore, and/or to check the safety condition of wellbore. Two indices, storage index and permeability index, are found to govern wellbore leakage mechanism and facilitate the creation of wellbore performance charts that monitor and check wellbores’ leakage mechanism and their lifecycle performance.
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
Nabih, A., and Chalaturnyk, R., (2013), Wellbore Efficiency Model for CO2 Geological Storage Part I: Theory and Wellbore Element, SPE Heavy Oil Conference-Canada, 11-13 June, Calgary, Alberta, Canada, SPE 165411, 14 p.Nabih, A., and Chalaturnyk, R., (2013), Wellbore Efficiency Model for CO2 Geological Storage Part II: Wellbore System, SPE Unconventional Resources Conference Canada, 5-7 November, Calgary, Alberta, Canada , SPE 167149, 14 p.Nabih, A., and Chalaturnyk, R., (2014), Characterization of Wellbore Cement Properties by Means of Maturity Rule and Population Growth Models, Offshore Technology Conference, Houston, Texas, USA, 5-8 May 2014, OTC 25091, 15 p.Nabih, A., and Chalaturnyk, R., (2014), Stochastic Life Cycle Approach to Assess Wellbore Integrity for CO2 Geological Storage, SPE Heavy Oil Conference Canada, Calgary, Alberta, Canada, 10-12 June 2014, SPE 170183, 17 p.A report of invention (ROI) patent application related to this study was submitted to TEC-Edmonton, ROI 2011089. A US provisional patent application numbered 61/897,617 has been filed and is titled by Full Life Cycle Assessment of Wellbore Integrity.

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File title: Dedication
File title: Chapter 1: Introduction
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