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首页> 外文会议>AIChE annual meeting >Laboratory and Numerical Simulation based Investigation of Two-Phase Brine-CO2 Displacement Processes Using Cores from Three CO2-Sequestration Candidate Formations
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Laboratory and Numerical Simulation based Investigation of Two-Phase Brine-CO2 Displacement Processes Using Cores from Three CO2-Sequestration Candidate Formations

机译：基于实验室和数值模拟的使用三个CO2隔离候选岩层岩心进行两相盐水CO2驱替过程的研究

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Capturing carbon dioxide (CO2) from power plants and other sources of itsemissions and injecting it into deep geologic formations for permanent storage purposeshas become an important area of research recently. Some of the good formationcandidates for CO2 sequestration are deep saline aquifers because they have a highstorage capacity and because they are available in almost all sedimentary basins of theworld. The effectiveness of the sequestration process in saline aquifers depends highlyon the two-phase CO2-brine relative permeability behavior and the latter can only bemeasured in the laboratory. Although relative permeability data for hydrocarbon bearingformations are generally available, very little is known about the relative permeability ofCO2-brine two phase systems, especially for the cases involving actual reservoir rocks.In this paper, we present relative permeability data generated on three saline formationsthat are being explored as potential candidates for CO2 capture and sequestration. Theseare - the KNO_x sandstone, the St. Peter sandstone, and the Sylvania formation. The latteris divided into an upper sandstone formation and a lower dolomite formation, and bothare investigated separately. Three 1.5 inch diameter by 2 inch long core plugs from eachformation, drilled in the direction of flow, were used to form composite cores in order toconduct drainage CO2-brine relative permeability measurements using the unsteady statemethod at simulated reservoir conditions. In order to understand the various phenomenataking place during multiphase displacement processes, all of these experiments wereconducted inside an X-ray CT (computerized tomography) scanner. Pixel-by-pixel imagesubtraction was used to calculate individual saturations of brine and CO2 at variousstages of displacement. CT-based heterogeneity measurements were used to compare theheterogeneity of different plugs and to assess the effect of heterogeneity on displacement.Additionally, the CT-based image data were used to see if capillary end effects, gravitysegregation and bypassing occurred during each test.The results indicate low CO2 end point relative permeability (k_(rg)) in the range of0.036 to 0.34 for the three formations. These low values can be attributed to rockheterogeneity as indicated by the saturation distribution determined from the scannerimages. Such low relative permeability values would tend to decrease injectivity andhence increase the displacement efficiency. This was reflected on the residual brinesaturations which were in the range of 0.25 to 0.45 indicating good storage potential for
机译：从发电厂及其其他来源捕获二氧化碳（CO2） 排放并将其注入深层地质构造中以进行永久存储 最近已成为重要的研究领域。一些良好的阵型 二氧化碳封存的候选者是深盐水层，因为它们具有较高的 的存储容量，并且因为它们几乎可以在该州的所有沉积盆地中使用 世界。盐分含水层中螯合过程的有效性在很大程度上取决于 两相二氧化碳相对盐水的相对渗透性，而后者只能是 在实验室测量。尽管碳氢化合物轴承的相对渗透率数据 地层通常是可用的，但对它的相对渗透率知之甚少 CO2盐水两相系统，特别是在涉及实际储层岩石的情况下。 在本文中，我们介绍了在三个盐层中生成的相对渗透率数据 目前正在探索将其作为二氧化碳捕集和封存的潜在候选者。这些 是-KNO_x砂岩，圣彼得砂岩和西尔瓦尼亚地层。后者 分为上层砂岩层和下层白云岩层，两者 分别进行调查。每个都有三个1.5英寸直径乘2英寸长的芯插头 在流动方向上钻孔的岩层用于形成复合岩心，以便 使用不稳定状态进行排水CO2-盐水相对渗透率测量 方法在模拟油藏条件下。为了了解各种现象 发生在多相驱替过程中，所有这些实验都是 在X射线CT（计算机断层扫描）扫描仪内进行。逐像素图像 减法用于计算不同条件下盐水和CO2的单独饱和度 位移的阶段。基于CT的异质性测量用于比较 不同塞子的异质性，并评估异质性对位移的影响。 此外，使用基于CT的图像数据来查看毛细血管末端效应，重力 在每个测试过程中都发生了隔离和旁路。 结果表明，较低的CO2终点相对渗透率（k_（rg））在的范围内。 这三个阵型为0.036至0.34。这些低值可以归因于摇滚 由扫描仪确定的饱和度分布所指示的异质性 图片。如此低的相对磁导率值往往会降低注入率，并且 因此提高了置换效率。这反映在残留的盐水上 饱和度在0.25到0.45的范围内，表明对

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