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Experimental Study of Genesis of a Geologically Activated and Self-Sealing Cementing Material for Deep Wellbore Plugging and Abandonment

Lu, Yunxing and Spencer-Williams, Isaiah and Chang, Nina and Bunger, Andrew (2022) Experimental Study of Genesis of a Geologically Activated and Self-Sealing Cementing Material for Deep Wellbore Plugging and Abandonment. (Submitted)

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Harsh subsurface conditions pose a widespread challenge for permanently plugging and abandoning (P&A) oil and gas wells. A new, cement-free plugging material is proposed and demonstrated using Nature-inspired geochemical prosesses to generate stable and resilient, rock-like material that is ideally suited to acidic geofluid, high-pressure, and high-temperature (AG-HP-HT) conditions. These conditions accelerate hydration and carbonation reactions that turn granular ultramafic raw materials into competent rock, dubbed here as "Geologically Activated Cement" (GAC). The results show that within hours to days, and hence relevant to P&A operational timeframes, a magnesium silicate-based, solid, rock-like material can be produced from Mg2SiO4-CO2 mixtures. Furthermore, the GAC can self-seal within a few hours when subjected to damage and subsequent flow of acidic fluid under HPHT conditions. This self-sealing behavior provides the potential for a resilient cementing system over geological timescales.


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Item Type: Article
Status: Submitted
CreatorsEmailPitt UsernameORCID
Lu, Yunxingyul184@pitt.eduyul184
Spencer-Williams, Isaiahims17@pitt.eduims17
Chang, Ninansc22@pitt.edunsc22
Bunger, Andrewbunger@pitt.edubunger0000-0002-0696-7066
Centers: Other Centers, Institutes, Offices, or Units > Center for Aging and Population Health
Date: 3 March 2022
Date Type: Submission
Schools and Programs: Swanson School of Engineering > Civil and Environmental Engineering
Refereed: No
Uncontrolled Keywords: Resilient Plug and Abandonment (P&A) System; Acidic Geofluid, High-Pressure, High-Temperature (AG-HP-HT); Ultramafic Mineral Carbonation; Self-sealing; Carbon Sequestration, Storage and Utilization (CSSU)
Funders: National Academies of Science, Engineering, and Medicine Gulf Research Program
Article Type: Research Article
Date Deposited: 26 Apr 2022 17:49
Last Modified: 26 Apr 2022 17:49


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