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WELLBORE STABILITY FOR CARBON SEQUESTRATION IN GEOLOGICAL FORMATION

地质地层碳封存的井筒稳定性

基本信息

批准号：
2132118
负责人：
金额：
--
依托单位：
Newcastle University
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2018
资助国家：
英国
起止时间：
2018 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2132118
关键词：
WELLBORE STABILITY CARBON SEQUESTRATION GEOLOGICAL

项目摘要

1. INTRODUCTIONThe increase of knowledge of the effect of CO2 on climate change has led scientists and engineers to investigate mechanisms to control global warming by decreasing the emissions of CO2 into the atmosphere. One promising approach is Carbon Capture and Storage (CCS). In CCS schemes, CO2 is captured from large-scale industrial emitters and transported to either be used (e.g. algae cultivation) or stored permanently in geological sites, where it is injected into rock geological formation. Research studies were undertaken on how to store CO2 in geological rock formations as different stresses, fractures and pressures during CO2 injection can compromise the storage capacity of the storage site. 2. AIM AND OBJECTIVES OF THE PROJECTThe main aim of the project is to develop a CO2 injection model which will consider the thermo-hydro-mechanical coupling effect on the wellbore stability caused by intermittent injection of CO2. The main objectives of this study will be as follows:* A robust elastic-plastic damage constitutive model will be proposed. The created model will consider the irregularity of CO2 pressure and temperature inside the wellbore.* The model will be implemented into the Finite Element Method (FEM) and calibrated by existing laboratory testing results from literature. The calibrated numerical method will be used to do more analysis for various wellbore design to seek the optimised design for intermediate CO2 injection to geological formations.* Different curves will be created relating the degree of damage around the wellbore to the effects of different loadings and temperature changes. These curves can be provided to the industry in order to improve future wellbore designs. 3. METHODOLOGYThe research would be accordingly comprised of four parts as follows: * During the first two years, a constitutive model of double porosity rock under complex loading conditions will be created. The created model will describe the flow of CO2 from the ship all the way down to the wellbore. It would be also capable to predict the near-field expansion of CO2. After a 6 month literature research and publishing a general review conference paper for "ARMA symposium in New York", the constitutive model in agreement with the supervisory team was decided to follow and upgrade the study of Ma and Zhao (2018) and Khalili and Valliappan (1996). So far, the governing equations of the model used by Ma and Zhao (2018) were studied carefully in order to be able to create the appropriate coding that can reproduce their results. MATLAB software will be used for the THM constitutive modelling. Bai's (2016) PhD dissertation and Khalili's et al. (2010) research were selected as a guideline for modifications on the constitutive equations of Ma and Zhao (2018) in order to include thermal effects in the model. This will give a robust THM constitutive model for fractured porous media/rock. * The final stages of the PhD project are to further improve the numerical model. The model will be calibrated using the results of existing laboratory results in literature. Finite Element Method [FEM] will be adopted. The calibrated model will be applied to further scenarios and working conditions. A more reliable wellbore design can then be proposed under various working conditions. ReferencesBai, Y. 2016. Coupled thermos-hydro-mechanical (THM) model for multiphase flow through deformable porous media with double porosity. PhD dissertation. Khalili-Naghadeh, N. and S. Valliappan. 1991. Flow through fissured porous media with deformable matrix: Implicit formulation. Water Resources Research, 27(7), pp.1703-1709.Khalili, N., A. Uchaipichat, and A. Javadi. 2010. Skeletal thermal expansion coefficient and thermo-hydro-mechanical constitutive relations for saturated homogeneous porous media. Mechanics of Materials, 42(6), pp.593-598.Ma, J., and G.F. Zhao. 2018. Borehole Stability Analysis in Fractured Porous Media Associated with Ela

1. 引言随着人们对二氧化碳对气候变化影响的了解不断增加，科学家和工程师开始研究通过减少二氧化碳排放到大气中来控制全球变暖的机制。一种有前景的方法是碳捕获与封存（CCS）。在 CCS 计划中，二氧化碳从大型工业排放源中捕获，并运输至使用（例如藻类培养）或永久储存在地质地点，注入岩石地质构造中。人们对如何在地质岩层中封存二氧化碳进行了研究，因为二氧化碳注入期间的不同应力、裂缝和压力可能会损害封存地点的封存能力。 2. 项目的目的和目标该项目的主要目的是开发一个 CO2 注入模型，该模型将考虑间歇注入 CO2 引起的热-水-机械耦合对井眼稳定性的影响。这项研究的主要目标如下：*将提出一个稳健的弹塑性损伤本构模型。创建的模型将考虑井眼内 CO2 压力和温度的不规则性。*该模型将应用于有限元法 (FEM)，并根据文献中现有的实验室测试结果进行校准。校准后的数值方法将用于对各种井眼设计进行更多分析，以寻求中间二氧化碳注入地质层的优化设计。*将创建不同的曲线，将井眼周围的损坏程度与不同载荷和温度变化的影响联系起来。这些曲线可以提供给业界，以改进未来的井眼设计。 3.方法学相应的研究将由以下四个部分组成： * 在头两年内，将创建复杂加载条件下双孔隙岩石的本构模型。创建的模型将描述二氧化碳从船舶一直流到井眼的流动。它还能够预测二氧化碳的近场扩张。经过6个月的文献研究并发表了“纽约ARMA研讨会”的综合评审会议论文，指导小组一致决定本构模型是对Ma和Zhao（2018）以及Khalili和Valliappan（1996）研究的继承和升级。到目前为止，Ma 和 Zhu（2018）使用的模型的控制方程已经被仔细研究，以便能够创建可以重现其结果的适当编码。 MATLAB 软件将用于 THM 本构建模。 Bai（2016）的博士论文和 Khalili 等人。 (2010)的研究被选为对Ma和Zhao (2018)的本构方程进行修改的指南，以便在模型中包含热效应。这将为裂隙多孔介质/岩石提供稳健的 THM 本构模型。 * 博士项目的最后阶段是进一步改进数值模型。该模型将使用文献中现有实验室结果进行校准。将采用有限元法[FEM]。校准后的模型将应用于更多场景和工况。然后可以在各种工况下提出更可靠的井眼设计。参考文献Bai, Y. 2016。通过双孔隙可变形多孔介质的多相流的热-水-机械耦合 (THM) 模型。博士论文。 N. Khalili-Naghadeh 和 S. Valliappan。 1991.流经具有可变形基质的裂隙多孔介质：隐式公式。水资源研究，27(7)，第 1703-1709 页。Khalili, N.、A. Uchaipichat 和 A. Javadi。 2010.饱和均质多孔介质的骨架热膨胀系数和热-水-机械本构关系。材料力学，42(6)，第 593-598 页。Ma, J., 和 G.F.赵. 2018. 与 Ela 相关的裂隙多孔介质的钻孔稳定性分析