Reactive transport of CO2-rich fluids in simulated wellbore interfaces : Flow-through experiments on the 1–6 m length scale

Debonding at casing-cement interfaces poses a leakage pathway risk that may compromise well integrity in CO2 storage systems. The present study addresses the effects of long-range, CO2-induced, reactive transport on the conductance of such interfacial pathways. This is done by means of reactive flow-through experiments, performed on simulated wellbore systems consisting of cement-filled steel tubes, measuring 1.2–6.0 m in length. These were prepared by casting Class G HSR Portland cement into steel tubes (inner diameter 6–8 mm), followed by curing for 6–12 months. The tubes were subsequently pressurized to permanently inflate them off the cement, creating debonded cement-steel interfaces. Four experiments were performed, at temperatures of 60–80 °C, employing flow-through of CO2-bearing fluid at mean pressures of 10–15 MPa, controlling the pressure difference at 0.12–4.8 MPa, while measuring flow-rate. The results show decreases in sample permeability of 2–4 orders, which microstructural observations reveal to be associated with downstream precipitation of calcium carbonates, possibly aided by migration of fines. This demonstrates that reactive-flow on the metre-scale significantly enhances the self-sealing potential of cement-casing interfaces relative to near-static reaction experiments. The results and method presented can be used not only to understand the long-range behaviour of annuli in wells qualitatively, but also to test reactive transport models which can then be applied at the field scale.

[1]  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 .

[2]  James P. Carson,et al.  Wellbore cement fracture evolution at the cement-basalt caprock interface during geologic carbon sequestration , 2014 .

[3]  David J. Young,et al.  Wellbore integrity and corrosion of carbon steel in CO2 geologic storage environments: A literature review , 2013 .

[4]  J. D. Bredehoeft,et al.  A transient laboratory method for determining the hydraulic properties of ‘tight’ rocks—II. Application , 1981 .

[5]  J. Bear.  Dynamics of Fluids in Porous Media , 1975 .

[6]  H. Alsaiari.  Iron (II)-calcium carbonate: Precipitation interaction , 2008 .

[7]  Mileva Radonjic,et al.  Experimental study on a single cement-fracture using CO2 rich brine , 2011 .

[8]  Mark D. Semon,et al.  POSTUSE REVIEW: An Introduction to Error Analysis: The Study of Uncertainties in Physical Measurements , 1982 .

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

[10]  S. Bryant,et al.  Dynamic alteration along a fractured cement/cement interface: Implications for long term leakage risk along a well with an annulus defect , 2011 .

[11]  Jonny Rutqvist,et al.  The Geomechanics of CO2 Storage in Deep Sedimentary Formations , 2012, Geotechnical and Geological Engineering.

[12]  J. Carey.  Geochemistry of Wellbore Integrity in CO2 Sequestration: Portland Cement-Steel-Brine-CO2 Interactions , 2013 .

[13]  P. Longuemare,et al.  Analyzing the Risk of Well Plug Failure after Abandonment , 2007 .

[14]  G. Hagen,et al.  Ueber die Bewegung des Wassers in engen cylindrischen Röhren , 1839 .

[15]  Christos Tzimopoulos,et al.  A new explicit relation for the Friction coefficient in the Darcy – Weisbach equation , 2010 .

[16]  R. Jeanloz,et al.  Introduction to the physics of rocks , 1994 .

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

[18]  Rick Chalaturnyk,et al.  A decade of CO2 injection into depleting oil fields: Monitoring and research activities of the IEA GHG Weyburn-Midale CO2 Monitoring and Storage Project , 2011 .

[19]  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.

[20]  Jiabin Han,et al.  Degradation Of Cement-Steel Composite At Bonded Steel-Cement Interfaces In Supercritical CO 2 Saturated Brines Simulating Wellbore Systems , 2012 .

[21]  B. Lothenbach,et al.  Thermodynamic Modelling of the Effect of Temperature on the Hydration and Porosity of Portland Cement , 2008 .

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

[23]  G. Scherer,et al.  Degradation of cement at the reservoir/cement interface from exposure to carbonated brine , 2011 .

[24]  Bogdan Orlic,et al.  Some geomechanical aspects of geological CO2 sequestration , 2009 .

[25]  Peter C. Lichtner,et al.  Wellbore integrity and CO2 -brine flow along the casing-cement microannulus , 2009 .

[26]  B. Allard,et al.  Chemical composition of cement pore solutions , 1989 .

[27]  S. Bryant,et al.  The influence of confining stress and chemical alteration on conductive pathways within wellbore cement , 2009 .

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

[29]  B. Kutchko,et al.  Rate of CO2 attack on hydrated Class H well cement under geologic sequestration conditions. , 2008, Environmental science & technology.

[30]  Carlos García,et al.  Microstructural changes induced in Portland cement-based materials due to natural and supercritical carbonation , 2008 .

[31]  S. Nešić.  Key issues related to modelling of internal corrosion of oil and gas pipelines - A review , 2007 .

[32]  A. Bunger,et al.  Interface debonding driven by fluid injection in a cased and cemented wellbore: Modeling and experiments , 2013 .

[33]  C. Spiers,et al.  Pore-scale modeling of reactive transport in wellbore cement under CO2 storage conditions , 2012 .

[34]  B. Kutchko,et al.  CO2 reaction with hydrated class H well cement under geologic sequestration conditions: effects of flyash admixtures. , 2009, Environmental science & technology.

[35]  P. Nawrocki,et al.  Why Oilwells Leak: Cement Behavior and Long-Term Consequences , 2000 .

[36]  Frank Winnefeld,et al.  Effect of temperature on the pore solution, microstructure and hydration products of Portland cement pastes , 2007 .

[37]  F. Brunet,et al.  Heterogeneous Porosity Distribution in Portland Cement Exposed to CO2-rich Fluids , 2008 .

[38]  R. Zwanzig,et al.  Modifications of the Stokes-Einstein formula , 1985 .

[39]  G. Scherer,et al.  Degradation of oilwell cement due to exposure to carbonated brine , 2010 .

[40]  A. Grandi,et al.  4D reservoir geomechanics: a case study from the HP/HT reservoirs of the Elgin and Franklin fields , 2008 .

[41]  R. Skalak,et al.  THE HISTORY OF POISEUILLE'S LAW , 1993 .

[42]  N. Kampman,et al.  Pulses of carbon dioxide emissions from intracrustal faults following climatic warming , 2012 .

[43]  A. Battistelli,et al.  Modeling of Rocks and Cement Alteration due to CO2 Injection in an Exploited Gas Reservoir , 2011 .

[44]  Steven L. Bryant,et al.  Reactive transport of CO2-saturated water in a cement fracture: Application to wellbore leakage during geologic CO2 storage , 2016 .

[45]  G. Rimmelé,et al.  A solution against well cement degradation under CO2 geological storage environment , 2009 .

[46]  Gian Piero Celata,et al.  EXPERIMENTAL INVESTIGATION OF HYDRAULIC AND SINGLE-PHASE HEAT TRANSFER IN 0.130-MM CAPILLARY TUBE , 2002, Proceeding of Heat Transfer and Transport Phenomena in Microscale.

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

[48]  Glenn O. Brown.  The History of the Darcy-Weisbach Equation for Pipe Flow Resistance , 2002 .

[49]  B. Orlic,et al.  Characteristics of mechanical wellbore failure and damage: Insights of discrete element modelling and application to CO2 storage , 2015 .

[50]  F. Mulders,et al.  The feasibility of effective and safe carbon dioxide storage in the De Lier gas field , 2008 .

[51]  P. Gouze,et al.  Characterization and modeling of the alteration of fractured class-G Portland cement during flow of CO2-rich brine , 2016 .

[52]  S. Walsh,et al.  Experimental calibration of a numerical model describing the alteration of cement/caprock interfaces by carbonated brine , 2014 .

[53]  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 .

[54]  Li Li,et al.  Self‐healing of cement fractures under dynamic flow of CO2‐rich brine , 2015 .

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

[56]  M. Celia,et al.  Permeability evolution due to dissolution and precipitation of carbonates using reactive transport modeling in pore networks , 2013 .

[57]  S. Walsh,et al.  Mechanical and hydraulic coupling in cement–caprock interfaces exposed to carbonated brine , 2014 .

[58]  Jeffrey J. Thomas,et al.  Solubility behavior of Ca-, S-, Al-, and Si-bearing solid phases in Portland cement pore solutions as a function of hydration time , 2002 .

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

[60]  Yves Bernabé,et al.  The effective pressure law for permeability in Chelmsford granite and Barre granite , 1986 .

[61]  N. Huerta,et al.  Fracture opening or self-sealing: Critical residence time as a unifying parameter for cement–CO2–brine interactions , 2016 .

[62]  Jan M. Nordbotten,et al.  Risk of Leakage versus Depth of Injection in Geological Storage , 2009 .

[63]  J. D. Bredehoeft,et al.  A Transient Laboratory Method for Determining the Hydraulic Properties of "Tight"Rocks-I, Theory , 1981 .

[64]  M. Fleury,et al.  Electrical Conductivity and Viscosity of Aqueous NaCl Solutions with Dissolved CO2 , 2008 .

[65]  M. Loizzo,et al.  Stability of a leakage pathway in a cemented annulus , 2011 .

[66]  J. Carey,et al.  A coupled electrochemical–geochemical model of corrosion for mild steel in high-pressure CO2–saline environments , 2011 .

[67]  R. E. Jackson,et al.  Gas Release Mechanisms from Energy Wellbores , 2014 .

[68]  Zhenhao Duan,et al.  An improved model calculating CO2 solubility in pure water and aqueous NaCl solutions from 273 to 533 K and from 0 to 2000 bar , 2003 .

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

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

[71]  A. Islam,et al.  Viscosity Models and Effects of Dissolved CO2 , 2012 .

[72]  D. Draẑić,et al.  The anodic dissolution process on active iron in alkaline solutions , 1982 .

[73]  Mickaël Thiery,et al.  Measurement methods of carbonation profiles in concrete: Thermogravimetry, chemical analysis and gammadensimetry , 2007 .

[74]  Suzanne Hangx,et al.  Effect of CO2-induced reactions on the mechanical behaviour of fractured wellbore cement , 2016 .

[75]  Andrew Duguid.  An estimate of the time to degrade the cement sheath in a well exposed to carbonated brine , 2009 .

[76]  Michael A. Celia,et al.  Wellbore integrity analysis of a natural CO2 producer , 2009 .

[77]  J. Sulem,et al.  Experimental investigation of particle suspension injection and permeability impairment in porous media , 2015 .

[78]  Seth B C Shonkoff,et al.  Assessment and risk analysis of casing and cement impairment in oil and gas wells in Pennsylvania, 2000–2012 , 2014, Proceedings of the National Academy of Sciences.

[79]  Matteo Loizzo,et al.  Interface debonding as a controlling mechanism for loss of well integrity: Importance for CO2 injector wells , 2011 .

[80]  Zhenhao Duan,et al.  The Viscosity of Aqueous Alkali-Chloride Solutions up to 623 K, 1,000 bar, and High Ionic Strength , 2009 .

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