Pressure Management and Plume Control at the Devine Test Site, South Texas by Means of Brine Extraction
本研究旨在解决盐水二氧化碳封存（GCS）中因二氧化碳注入而导致的压力积累问题。通过设计卤水提取现场试验项目，研究了在德克萨斯州Devine测试点的Hosston地层进行压力管理和气流控制的可能性。研究探讨了利用地震和示踪数据监测压力前沿和注入流体羽流的可能性，并使用CMG-STARS软件进行了主动压力管理系统（APMS）和被动压力管理系统（PPMS）的模拟研究，以展示在储层中控制压力积累的可能性。研究结果表明，主动提取卤水相比被动提取能更有效地控制压力，对于不同的非均质情况，主动提取的压力控制效果比无提取情况好35-45%，而被动提取仅好2-5%。
CMG软件的应用情况
在本研究中，CMG-STARS软件被用于执行不同卤水提取情景下的数值模拟，以优化最佳的压力控制设计。通过CMG-CMOST软件的敏感性模拟，研究了渗透率、层厚、孔隙度、注入速率和岩石压缩性等主要卤水提取设计变量对压力控制的影响。所有模拟均为单相卤水流动，模拟使用CMG-STARS模拟器进行。
Abstract
A critical issue for saline CO , storage is build － up of pressure caused by CO , injection . The magnitude of the pressure build - up depends on many factors, including the injection rate, static properties of the target formation, nature of the in - situ and injected fluids , and the formation boundary conditions . Maximum pressure increase is localized at the injection well; however, a pressure front diffuses into the formation, increasing pressure regionally far from the injection well. Within the context of cO2 geological storage, excessive pressure buildup is undesirable because it increases risks of CO2 plume leak into unwanted zones, reduces the storage capacity of the formation and can limit the life of a storage project. In this study, we design a brine extraction field pilot project for pressure management and plume control at Hosston Formation in Devine Test Site in Texas. We investigated the possibility of using seismic and tracer data to monitor pressure front and injected fluids plume. Seismic surveys provide the volumetric coverage needed to understand the 3D subsurface fluid and pore pressure front movement; however, the limit of seismic detectability may be influenced by Hosston formation initial pore pressure. The range of minimum pore pressure increase needed to produce detectable P - wave and S - wave seismic velocities is investigated. Simulation study of active pressure management system APMS) and passive pressure management system (PPMS) at the Devine Test Site is performed using CMG - STARS to demonstrate the possibility of the pressure build up control in the storage formation. The estimation of pore pressure increase from flow simulations will help us to understand if the pressure changes during brine injection and extraction can be detected using seismic response.
作者单位
作者单位为德克萨斯大学奥斯汀分校海湾海岸碳中心（Gulf Coast Carbon Center, The University of Texas at Austin）。
