Wellbore cement fracture evolution at the cement-basalt caprock interface during geologic carbon sequestration

Abstract Composite Portland cement–basalt caprock cores with fractures, as well as neat Portland cement columns, were prepared to understand the geochemical and geomechanical effects on the integrity of wellbores with defects during geologic carbon sequestration. The samples were reacted with CO 2 –saturated groundwater at 50 °C and 10 MPa for 3 months under static conditions, while one cement–basalt core was subjected to mechanical stress at 2.7 MPa before the CO 2 reaction. Micro-XRD and SEM–EDS data collected along the cement–basalt interface after 3-month reaction with CO 2 –saturated groundwater indicate that carbonation of cement matrix was extensive with the precipitation of calcite, aragonite, and vaterite, whereas the alteration of basalt caprock was minor. X-ray microtomography (XMT) provided three-dimensional (3-D) visualization of the opening and interconnection of cement fractures due to mechanical stress. Computational fluid dynamics (CFD) modeling further revealed that this stress led to the increase in fluid flow and hence permeability. After the CO 2 -reaction, XMT images displayed that calcium carbonate precipitation occurred extensively within the fractures in the cement matrix, but only partially along the fracture located at the cement–basalt interface. The 3-D visualization and CFD modeling also showed that the precipitation of calcium carbonate within the cement fractures after the CO 2 -reaction resulted in the disconnection of cement fractures and permeability decrease. The permeability calculated based on CFD modeling was in agreement with the experimentally determined permeability. This study demonstrates that XMT imaging coupled with CFD modeling represent a powerful tool to visualize and quantify fracture evolution and permeability change in geologic materials and to predict their behavior during geologic carbon sequestration or hydraulic fracturing for shale gas production and enhanced geothermal systems.

[1]  Taro Takahashi,et al.  Carbon dioxide sequestration in deep-sea basalt , 2008, Proceedings of the National Academy of Sciences.

[2]  Christopher J. Spiers,et al.  Fracture healing and transport properties of wellbore cement in the presence of supercritical CO2 , 2011 .

[3]  Wooyong Um,et al.  Imaging wellbore cement degradation by carbon dioxide under geologic sequestration conditions using X-ray computed microtomography. , 2013, Environmental science & technology.

[4]  K. Bandilla,et al.  Brine flow up a well caused by pressure perturbation from geologic carbon sequestration: Static and dynamic evaluations , 2011 .

[5]  P. Gouze,et al.  Characterization of the mechanisms controlling the permeability changes of fractured cements flowed through by CO2-rich brine. , 2013, Environmental science & technology.

[6]  S. Walsh,et al.  Chemical and mechanical properties of wellbore cement altered by CO₂-rich brine using a multianalytical approach. , 2013, Environmental science & technology.

[7]  Erika Holt,et al.  Cracking risks associated with early age shrinkage , 2004 .

[8]  Andrew P. Kuprat,et al.  Volume conserving smoothing for piecewise linear curves, surfaces, and triple lines , 2001 .

[9]  J. Carey,et al.  Geochemical effects of CO2 sequestration on fractured wellbore cement at the cement/caprock interface , 2009 .

[10]  Wooyong Um,et al.  Experimental study of potential wellbore cement carbonation by various phases of carbon dioxide during geologic carbon sequestration , 2012 .

[11]  James P. Carson,et al.  High resolution lung airway cast segmentation with proper topology suitable for computational fluid dynamic simulations , 2010, Comput. Medical Imaging Graph..

[12]  J William Carey,et al.  Experimental evaluation of wellbore integrity along the cement-rock boundary. , 2013, Environmental science & technology.

[13]  Xiangmin Jiao,et al.  Adaptive generation of multimaterial grids from imaging data for biomedical Lagrangian fluid–structure simulations , 2010, Biomechanics and modeling in mechanobiology.

[14]  Michael A. Celia,et al.  Spatial characterization of the location of potentially leaky wells penetrating a deep saline aquifer in a mature sedimentary basin , 2004 .

[15]  Frédéric Skoczylas,et al.  About Microcracking Due to Leaching in Cementitious Composites: X-ray Microtomography Description and Numerical Approach , 2010 .

[16]  John W. Morse,et al.  Crystallization pressure versus “crack seal” as the mechanism for banded veins , 2001 .

[17]  P. Gouze,et al.  Hydro-dynamically controlled alteration of fractured Portland cements flowed by CO2-rich brine , 2013 .

[18]  R. Wilkin,et al.  Geochemical impacts to groundwater from geologic carbon sequestration: controls on pH and inorganic carbon concentrations from reaction path and kinetic modeling. , 2010, Environmental science & technology.

[19]  James J. Dooley,et al.  Potential for carbon dioxide sequestration in flood basalts , 2006 .

[20]  J. Carey,et al.  Experimental investigation of wellbore integrity and CO2–brine flow along the casing–cement microannulus , 2010 .

[21]  Stefan Bachu,et al.  Aquifer disposal of CO2: Hydrodynamic and mineral trapping , 1994 .

[22]  Abraham S. Grader,et al.  Chemical diffusion between a fracture and the surrounding matrix: Measurement by computed tomography and modeling , 2003 .

[23]  David J Campbell,et al.  Natural gas plays in the Marcellus Shale: challenges and potential opportunities. , 2010, Environmental science & technology.

[24]  E. C. Sullivan,et al.  Petrophysical and geochemical properties of Columbia River flood basalt: Implications for carbon sequestration , 2012 .

[25]  Gudmundur S. Bodvarsson,et al.  Hydraulic conductivity of rock fractures , 1996 .

[26]  A. Neville.  Properties of Concrete , 1968 .

[27]  B. Kutchko,et al.  Degradation of well cement by CO2 under geologic sequestration conditions. , 2007, Environmental science & technology.

[28]  Herbert T. Schaef,et al.  Carbonate mineralization of volcanic province basalts , 2010 .

[29]  J. S. Y. Wang,et al.  Validity of cubic law for fluid flow in a deformable rock fracture. Technical information report No. 23 , 1979 .

[30]  P. Lichtner,et al.  Analysis and performance of oil well cement with 30 years of CO2 exposure from the SACROC Unit, West Texas, USA , 2007 .

[31]  S. Bachu,et al.  Experimental assessment of brine and/or CO2 leakage through well cements at reservoir conditions , 2009 .

[32]  B. Peter McGrail,et al.  Dissolution of Columbia River Basalt under mildly acidic conditions as a function of temperature: Experimental results relevant to the geological sequestration of carbon dioxide , 2009 .

[33]  Catherine A Peters,et al.  Safe storage of CO2 in deep saline aquifers. , 2002, Environmental science & technology.

[34]  François Renard,et al.  Calcite precipitation from CO2-H2O-Ca(OH)2 slurry under high pressure of CO2 , 2007 .

[35]  Li Li,et al.  Dynamic alterations in wellbore cement integrity due to geochemical reactions in CO2‐rich environments , 2013 .

[36]  Christopher J. Spiers,et al.  Reaction and transport in wellbore interfaces under CO2 storage conditions: Experiments simulating debonded cement–casing interfaces , 2013 .

[37]  C. Tsang,et al.  A study of caprock hydromechanical changes associated with CO2-injection into a brine formation , 2002 .

[38]  R. Jackson,et al.  Potential impacts of leakage from deep CO2 geosequestration on overlying freshwater aquifers. , 2010, Environmental science & technology.

[39]  Jiuping Xu,et al.  Greenhouse Gas Control , 2014 .

[40]  Jacques Desrues,et al.  3D imaging of fracture propagation using synchrotron X-ray microtomography , 2009 .

[41]  C. Steefel,et al.  Reactive transport modeling: An essential tool and a new research approach for the Earth sciences , 2005 .

[42]  S. Bryant,et al.  Experimental evidence for self-limiting reactive flow through a fractured cement core: implications for time-dependent wellbore leakage. , 2013, Environmental science & technology.

[43]  Andrew P. Kuprat,et al.  An anisotropic scale-invariant unstructured mesh generator suitable for volumetric imaging data , 2009, J. Comput. Phys..

[44]  D. Crandall,et al.  Numerical simulations examining the relationship between wall-roughness and fluid flow in rock fractures , 2010 .

[45]  S. Bachu,et al.  Review of integrity of existing wells in relation to CO2 geological storage: What do we know? , 2011 .

[46]  Eric N. Landis,et al.  Microstructure and fracture in three dimensions , 2003 .

[47]  J. Fitts,et al.  Modifications of Carbonate Fracture Hydrodynamic Properties by CO 2 -Acidified Brine Flow , 2013 .

[48]  S. Bachu,et al.  Evaluation of the Potential for Gas and CO2 Leakage Along Wellbores , 2009 .

[49]  Rony Wallach,et al.  Tracer diffusion from a horizontal fracture into the surrounding matrix: measurement by computed tomography. , 2003, Journal of contaminant hydrology.

[50]  Mark L. Rivers,et al.  Using X-ray computed tomography in hydrology: systems, resolutions, and limitations , 2002 .

[51]  Markus Häring,et al.  Characterisation of the Basel 1 enhanced geothermal system , 2008 .

[52]  William E. Lorensen,et al.  Marching cubes: A high resolution 3D surface construction algorithm , 1987, SIGGRAPH.