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

被引:61
作者
Cao, Peilin [1 ]
Karpyn, Zuleima T. [1 ,2 ]
Li, Li [1 ,2 ,3 ]
机构
[1] Penn State Univ, John & Willie Leone Family Dept Energy & Mineral, State Coll, PA 16801 USA
[2] Penn State Univ, Energy & Mineral Sci Energy Inst, State Coll, PA USA
[3] Penn State Univ, Earth & Environm Syst Inst, State Coll, PA USA
关键词
carbon sequestration; cement; fractures; wellbore integrity; CO2 GEOLOGICAL STORAGE; WELL CEMENT; DISSOLUTION KINETICS; SEQUESTRATION; WATER; INTEGRITY; PERMEABILITY; DEGRADATION; MAGNESITE; CALCITE;
D O I
10.1002/2014WR016162
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Fractures and defects in wellbore cement can lead to increased possibilities of CO2 leakage from abandoned wells during geological carbon sequestration. To investigate the physicochemical response of defective wellbore cement to CO2-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 CO2 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 self-healing 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 CO2-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.
引用
收藏
页码:4684 / 4701
页数:18
相关论文
共 74 条
[1]  
[Anonymous], 10A API
[2]  
[Anonymous], 1984, PERM BAS OIL GAS REC
[3]  
[Anonymous], DATING DURATION FLUI
[4]  
[Anonymous], 2006, P 8 C GREENH GAS TEC
[5]  
[Anonymous], UNC RES C CAN SOC PE
[6]  
[Anonymous], THESIS PRINCETON U
[7]  
[Anonymous], REC PRACT TEST WELL
[8]  
[Anonymous], IADC SPE DRILL C SOC
[9]   Screening and ranking of sedimentary basins for sequestration of CO2 in geological media in response to climate change [J].
Bachu, S .
ENVIRONMENTAL GEOLOGY, 2003, 44 (03) :277-289
[10]   CO2 storage in geological media:: Role, means, status and barriers to deployment [J].
Bachu, Stefan .
PROGRESS IN ENERGY AND COMBUSTION SCIENCE, 2008, 34 (02) :254-273