The effect of CO2 sequestration on oll well cements

Duguid, Andrew; Radonjic, Mileva; Bruant, Robert G.; Mandecki, Thomas; Scherer, George W.; Celia, Michael A.

doi:10.1016/b978-008044704-9/50258-5

Cited by 30 publications

(20 citation statements)

References 3 publications

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“…Numerous laboratory studies have addressed the chemical interaction between cured cement and carbon dioxide (Duguid et al, 2004;Barlet-Gouédard et al, 2007, 2009Carey et al, 2007;Kutchko et al, 2007Kutchko et al, , 2008Kutchko et al, , 2009Garcí a-González et al, 2008; fronts penetrating up to 1-25 mm into the cement after one year of reaction (Duguid et al, 2004;Barlet-Gouédard et al, 2006;Kutchko et al, 2008). By contrast, carbonation under confined conditions approaching those expected in situ results in a decrease in porosity and permeability, thereby improving sealing capacity (Bachu and Bennion, 2009;Liteanu and Spiers, 2011).…”

Section: Introductionmentioning

confidence: 95%

Pore-scale modeling of reactive transport in wellbore cement under CO2 storage conditions

Raoof

Nick

Wolterbeek

et al. 2012

International Journal of Greenhouse Gas Control

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Section: Introductionmentioning

confidence: 95%

Pore-scale modeling of reactive transport in wellbore cement under CO2 storage conditions

Raoof

Nick

Wolterbeek

et al. 2012

International Journal of Greenhouse Gas Control

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“…These wells have endured changes in thermal stresses, cyclic stressing due to injection and production, formation pressure, and geomechanical stresses during the lifecycle of exploration and production. Although sealed and plugged with wellbore cement upon abandonment, wells still experience damage arising from chemical reactions of wellbore cement or mechanical failure [Bruckdorfer, 1986;Bui and Tutuncu, 2013;Duguid et al, 2005;Onan, 1984;Sauki and Sonny, 2010]. Possible leakage pathways include annular spaces or degraded zones between cement and rock, between the cement and the casing, or the cement plug itself [Celia and Bachu, 2003].…”

Section: Introductionmentioning

confidence: 99%

Self‐healing of cement fractures under dynamic flow of CO₂‐rich brine

Cao

Karpyn

2015

Water Resources Research

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Fractures and defects in wellbore cement can lead to increased possibilities of CO 2 leakage from abandoned wells during geological carbon sequestration. To investigate the physicochemical response of defective wellbore cement to CO 2 -rich brine, we carried out a reactive flow-through experiment using an artificially fractured cement sample at a length of 224.8 mm. A brine solution with dissolved CO 2 at a pH of approximately 3.9 was injected through the sample at a constant rate of 0.0083 cm 3 /s. Surface optical profilometry analysis and 3-D X-ray microtomography imaging confirmed fracture closure and selfhealing behavior consistent with the measured permeability decrease. Visual inspection of the reacted fracture surface showed the development of reactive patterns mapping the flow velocity field inside the fracture, as well as restricted flow toward the sample outlet. The postexperiment permeability of the core sample was measured at half of its initial permeability. A reactive transport model was developed with parameters derived from the experiment to further examine property evolution of fractured cement under dynamic flow of CO 2 -rich brine. Sensitivity analysis showed that residence time and the size of initial fracture aperture are the key factors controlling the tendency to self-healing or fracture opening behavior and therefore determine the long-term integrity of the wellbore cement. Longer residence time and small apertures promote mineral precipitation, fracture closure, and therefore flow restriction. This work also suggests a narrow threshold separating the fracture opening and self-sealing behavior.

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“…Given the very large number of pre-existing wells in depleted oil and gas reservoirs that might be considered for long term storage of CO 2 , it is important to have a suite of monitoring strategies in place to assure that migration is not occurring through the caprock, along pre-existing sub-vertical faults or fracture zones or along pre-existing oil and gas production wells that may have been improperly plugged or whose cements may have been incomplete or corroded (e.g. Celia et al, 2004;Duguid et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Seismic detection of CO2 leakage along monitoring wellbores

Bohnhoff

Zoback

Chiaramonte

et al. 2010

International Journal of Greenhouse Gas Control

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A pilot carbon dioxide (CO 2 ) sequestration experiment was carried out in the Michigan Basin in which ~10,000 tonnes of supercritical CO 2 was injected into the Bass Island Dolomite (BILD) at 1050 m depth. A Passive Seismic Monitoring (PSM) network was operated before, during and after the ~17 day injection period. The seismic monitoring network consisted of two arrays of eight, three-component sensors, deployed in two monitoring wells at only a few hundred meters from the injection point. 225 microseismic events were detected by the arrays. Of these, only one event was clearly an injectioninduced microearthquake. It occurred during injection, approximately 100 m above the BILD formation. No events, down to the magnitude -3 detection limit, occurred within the BILD formation during the injection. The observed seismic waveforms associated with the other 224 events were quite unusual in that they appear to contain dominantly compressional (P) but no (or extremely weak) shear (S) waves, indicating that they are not associated with shear slip on faults. The microseismic events were unusual in two other ways. First, almost all of the events occurred prior to the start of injection into the BILD formation. Second, hypocenters of the 94 locatable events cluster around the wells where the sensor arrays were deployed, not the injection well. While the temporal evolution of these events show no 2 correlation with the BILD injection, they do correlate with CO 2 injection for enhanced oil recovery (EOR) into the 1670 m deep Coral Reef formation that had been going on for ~2.5 years prior to the pilot injection experiment into the BILD formation. We conclude that the unusual microseismic events reflect degassing processes associated with leakage up and around the monitoring wells from the EOR-related CO 2 injection into the Coral Reef formation, ~700 m below the depth of the monitoring arrays. This conclusion is also supported by the observation that as soon as injection into the Coral Reef formation resumed at the conclusion of the BILD demonstration experiment, seismic events (essentially identical to the events associated with the Coral Reef injection prior to the BILD experiment) again started to occur close to a monitoring arrays. Taken together, these observations point to vertical migration around the casings of the monitoring wellbores. Detection of these unusual microseismic events was somewhat fortuitous in that the arrays were deployed at the depth where the CO 2 undergoes a strong volume increase during transition from a supercritical state to a gas. Given the large number of pre-existing wellbores that exist in depleted oil and gas reservoirs that might be considered for CO 2 sequestration projects, passive seismic monitoring systems could be deployed at appropriate depths to systematically detect and monitor leakage along them.

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The effect of CO2 sequestration on oll well cements

Cited by 30 publications

References 3 publications

Pore-scale modeling of reactive transport in wellbore cement under CO2 storage conditions

Pore-scale modeling of reactive transport in wellbore cement under CO2 storage conditions

Self‐healing of cement fractures under dynamic flow of CO₂‐rich brine

Seismic detection of CO2 leakage along monitoring wellbores

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The effect of CO2 sequestration on oll well cements

Cited by 30 publications

References 3 publications

Pore-scale modeling of reactive transport in wellbore cement under CO2 storage conditions

Pore-scale modeling of reactive transport in wellbore cement under CO2 storage conditions

Self‐healing of cement fractures under dynamic flow of CO2‐rich brine

Seismic detection of CO2 leakage along monitoring wellbores

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Resources

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Self‐healing of cement fractures under dynamic flow of CO₂‐rich brine