Development of a Reactive Transport Model for Field-Scale Simulation of Microbially Induced Carbonate Precipitation
Development of a Reactive Transport Model for Field-Scale Simulation of Microbially Induced Carbonate Precipitation
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DOI：
10.1029/2019wr025153
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发表时间：
2019-08-01
影响因子：
5.4
通讯作者：
El Mountassir, Grainne
中科院分区：
文献类型：
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作者：
Minto, James M.;Lunn, Rebecca J.;El Mountassir, Grainne
微生物诱导碳酸盐沉淀（Microbially induced carbonate precipitation，MICP）是一种很有前途的技术，可用于土壤稳定、多孔和裂缝介质中的渗透性控制、密封泄漏的烃类威尔斯井以及固定污染物。在确定最佳治疗策略之前，还需要进行许多进一步的田间试验。这些现场试验将是昂贵和耗时的\进行，目前是一个障碍，从实验室规模的过程过渡到一个实用的现场规模的部署技术的MICP。为了缩小范围内的潜在的治疗方案到一个可控的数量，我们提出了一个现场规模的反应运输模型的MICP，捕捉细菌运输和附着，尿素水解，易处理的CaCO 3沉淀的关键过程，并修改多孔介质的孔隙度和渗透性。该模型，命名为MIProutFoam，在OpenFOAM中实现，并在平面裂缝，三维砂介质孔隙尺度，并在连续尺度的9个注入/提取威尔斯井阵列的MICP治疗的结果。结果表明，它是必要的细菌附着模型，细菌附着应该是流体速度的函数，和分阶段注射策略可能会导致最均匀的沉淀在多孔介质中。
Microbially induced carbonate precipitation (MICP) is a promising technique that could be used for soil stabilization, for permeability control in porous and fractured media, for sealing leaky hydrocarbon wells, and for immobilizing contaminants. Many further field trials are required before optimum treatment strategies can be established. These field trials will be costly and time consuming to\carry out and are currently a barrier to transitioning MICP from a lab-scale process to a practical field-scale deployable technology. To narrow down the range of potential treatment options into a manageable number, we present a field-scale reactive transport model of MICP that captures the key processes of bacteria transport and attachment, urea hydrolysis, tractable CaCO3 precipitation, and modification to the porous media in terms of porosity and permeability. The model, named biogroutFoam, is implemented in OpenFOAM, and results are presented for MICP treatment in a planar fracture, three-dimensional sand media at pore scale, and at continuum scale for an array of nine injection/abstraction wells. Results indicate that it is necessary to model bacterial attachment, that bacterial attachment should be a function of fluid velocity, and that phased injection strategies may lead to the most uniform precipitation in a porous media.