Analysis of potential acid gas leakage from wellbores in Alberta, Canada

LeNeveu, D.M.

doi:10.1016/j.ijggc.2011.01.009

Cited by 11 publications

(1 citation statement)

References 57 publications

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“…Most of these projects are about the geological sequestration of CO 2 . The major challenges in geological sequestration are to map the movement of CO 2 in the subsurface (Carpenter et al 2011) and to demonstrate that CO 2 is safely contained within the reservoir (Benson et al 2005;LeNeveu 2011). Many gas reservoirs produce substantial amount of CO 2 that has to be disposed off, in which.…”

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confidence: 99%

On seismic monitoring of $$\hbox {CO}_{2}$$ CO 2 leakage from geological storages and its primary detection

et al. 2014

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Geological storage of CO 2 in mature sedimentary basins and deep saline water aquifer requires special considerations on the potential leakage pathways. Early detection of CO 2 leakage from geological storage is one of the primary objectives of any carbon capture and storage technique. Thermodynamic properties of injected CO 2 and formation fluid, and change in in-situ conditions may act as driving agent to CO 2 leakage. Therefore, it is important to monitor the saturation of CO 2 and identify the phase of CO 2 during the injection, storage and after storage stages in order to monitor its possible migration and leakage risks. Seismic monitoring of sequestrated CO 2 in subsurface is in practice in which Gassmann fluid substitution model is used to estimate porous rock and pore fluid properties. The seismic properties of CO 2 contaminated fluids are predicted by Wood's volume average formula. The analysis reveals that Wood's approach is unable to account properly the properties of fluid mixture especially near bubble point pressure of CO 2 /water mixture, thus unable to monitor primary leakage of CO 2 . A modified approach based on thermodynamics is adopted for the detection of primary leakage of CO 2 . The analysis shows that for a minute amount of free CO 2 , the P-wave velocity is much lower than the values predicted by the GassmannWood approach. The resulting normal reflectivity and AVO anomalies are much stronger than attained by conventional Gassmann-Wood approaches.

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On seismic monitoring of $$\hbox {CO}_{2}$$ CO 2 leakage from geological storages and its primary detection

et al. 2014

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Review of Mechanical Properties Related Problems for Acid Gas Injection

Liu

et al. 2014

Gas Injection for Disposal and Enhanced Recovery

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Potential for environmental impact due to acid gas leakage from wellbores at EOR injection sites near Zama Lake, Alberta

LeNeveu¹

2012

Greenhouse Gases

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The potential for environmental impact from future leakage of toxic hydrogen sulfide (H2S) at an enhanced oil recovery (EOR) and acid gas sequestration site near Zama Lake, Alberta, is examined. Over 800 pinnacle reefs are potentially suitable for EOR by injection of acid gas. Leakage rate as a function of time through a reference wellbore is determined for various scenarios including leakage through the annulus of the wellbore and leakage through the central plug seal of the wellbore with an intact and failed wellbore casing. Potential plumes of H2S in the air and in shallow aquifers emanating from a single reference wellbore and from 350 wellbores are modeled. Leakage rates from the 350 wellbores are calculated from randomly sampled wellbore seal failure times, reservoir permeability, and initial amounts of acid gas, and from reference values of other reservoir parameters. Results indicate that for hundreds of years after injection, the entire Zama Lake area of 12 000 km2 could have lethal concentrations of H2S over each of the leaking wellbores. The shallow aquifers over the entire Zama area and over 30 kilometres in the direction of aquifer flow could be undesirably tainted with dissolved H2S. The entire Zama Lake area and hundreds of kilometres beyond could become uninhabitable for more than 1000 years after injection due to toxic plumes of H2S in the air and in shallow aquifers. This analysis has implications for the potential use of acid gas for EOR and for subsurface sequestration in general in areas with large numbers of abandoned wells. © 2012 Society of Chemical Industry and John Wiley & Sons, Ltd

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Analysis of potential acid gas leakage from wellbores in Alberta, Canada

Cited by 11 publications

References 57 publications

On seismic monitoring of $$\hbox {CO}_{2}$$ CO 2 leakage from geological storages and its primary detection

On seismic monitoring of $$\hbox {CO}_{2}$$ CO 2 leakage from geological storages and its primary detection

Review of Mechanical Properties Related Problems for Acid Gas Injection

Potential for environmental impact due to acid gas leakage from wellbores at EOR injection sites near Zama Lake, Alberta

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