###
工程科学与技术:2022,54(1):167-176
←前一篇   |   后一篇→
本文二维码信息
码上扫一扫!
提高CO2封存强度的多层协同抽注技术
(1.中国科学院 武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071;2.中国科学院大学,北京 100049)
Improvement of CO2 Sequestration Intension with Collaborative Pumping-injection Technologies in Multi-formations
(1.State Key Lab. of Geo-mechanics and Geo-technical Eng., Inst. of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;2.Univ. of Chinese Academy of Sciences, Beijing 100049, China)
摘要
图/表
参考文献
相似文献
附件
本文已被:浏览 1545次   下载 979
投稿时间:2021-06-25    修订日期:2021-09-12
中文摘要: 中国已提出2030年碳达峰、2060年碳中和的碳减排目标,提高CO2捕集、地质利用与封存(CCUS)技术发展水平与商业化规模,是实现中国碳减排目标的关键所在。“十四五”规划已明确提出要开展碳捕集利用与封存(CCUS)重大项目示范。然而,由于中国大多数CO2储层的低渗透、非均质等特征,导致单一储层的CO2封存能力有限,无法满足CCUS重大项目示范所需的CO2地质封存量。本文提出将CO2封存强度(单位土地面积的CO2封存量)作为评价CCUS项目储层封存能力的关键指标,并计算了中国主要CO2咸水层封存和CO2强化驱油场地的CO2封存强度,结果表明,现有CO2咸水层封存和CO2强化驱油项目的封存强度大多在105 t/km2以下,无法满足中国双碳目标的需要。为显著提高CO2封存强度,提出CO2多层协同抽注技术的概念,通过注入井在多个储层射孔注入CO2,并利用采水井从多个储层中采出咸水,实现储层可用孔隙和储层压力的最优化调控,最终实现CO2封存强度的大幅度提高。为验证CO2多层协同抽注技术的效果,利用T2Well模拟软件,构建3种CO2多层统注及协同抽注的数值模型,模拟了CO2定压注入过程,分析了注入60 d后的储层压力分布、储层内CO2饱和度分布及CO2累计注入量。结果表明:在多层协同抽注条件下,储层压力聚集现象有明显缓解,从而降低了封存区域因压力聚集导致的力学不稳定性。通过分析CO2饱和度可知,注入CO2后,在抽注井间压力差的驱使下,羽流将向采出井偏移;此外,受岩石性质的影响,羽流形状和范围略有差异。根据3种条件下的模拟结果计算CO2封存强度可知,各向异性砂岩条件下多层协同抽注的封存强度最高达到1.115×106 t/km2,远大于现在已实施项目的封存强度。因此,多层协同抽注技术将较大地提高CO2封存强度,有利于节约中国国土资源,促进CO2封存技术的推广。
中文关键词: 碳中和  CCUS  封存强度  协同抽注技术
Abstract:China has put forward a carbon emission reduction target to reach CO2 emission peak in 2030 and carbon neutrality in 2060. It is vital for China to improve the development and commercialization scale of carbon capture, utilization and storage (CCUS) technology, to achieve the carbon emission reduction target. According to the 14th Five-Year Plan, large-scale demonstration CCUS projects will be carried out in China. However, due to the low permeability and heterogeneity of most CO2 storage formations in China, the capacity of CO2 storage is limited, which cannot provide enough subsurface CO2 storage space for the operation of large-scale CCUS projects. In this study, the concept of CO2 storage intensity (the amount of CO2 storage per unit area) was proposed to evaluate the CO2 storage capacity of China’s ongoing CCUS projects as the key indicator. The CO2 storage intensity indicator was calculated in both deep saline aquifer CO2 storage and CO2–EOR projects. The results showed that the CO2 storage intensities of all the listed projects were lower than 105 t/km2, which was unable to meet the needs of China’s dual carbon target. To substantially improve the CO2 storage intensity, a multi-layer coordinative injection and pumping technology was proposed in this study. This technology can substantially improve the CO2 storage intensity by injecting CO2 through multiple perforation tunnels and extracting saline water from multiple formations. The available pore spaces are increased and the formation pressure is optimized with this technology, which favors improvement of the CO2 storage intensity. To validate the performance of this technology, a multi-layer CO2 injection model was built by T2Well code for the numerical simulations of three different scenarios. CO2 injection was set as a constant pressure process during the 60 days injection. By looking at the pressure and CO2 saturation distributions, it was noted that the accumulation of pressure was reduced by the cooperation of injection and pumping, which decreased geomechanically instability. Based on the CO2 saturation distribution maps, migration of CO2 was driven by the pressure difference between the injection and pumping wells, which made the plume move toward the pumping wells. In addition, rock properties changed the shape and migration range of the plume during CO2 injection. The CO2 storage intensities were calculated under the three simulated conditions. Among them, the CO2 storage intensity for the heterogeneous sandstone was the highest, which reached 1.115×106 t/km2. This value was far larger than China’s existing CCUS projects. In summary, the multi-layer injection and pumping technology can greatly increase the amount of CO2 injection, which is beneficial for the conservation of land in China and promotes the deployment of large-scale CCUS projects in China.
文章编号:202100601     中图分类号:    文献标志码:
基金项目:
作者简介:第一作者:李小春(1964-),男,研究员,博士.研究方向:二氧化碳地质利用与封存相关技术研发与推广.E-mail:xcli@whrsm.ac.cn;通信作者:张力为,E-mail:lwzhang@whrsm.ac.cn
引用文本:
李小春,梅开元,蔡雨娜,张力为.提高CO2封存强度的多层协同抽注技术[J].工程科学与技术,2022,54(1):167-176.
LI Xiaochun,MEI Kaiyuan,CAI Yuna,ZHANG Liwei.Improvement of CO2 Sequestration Intension with Collaborative Pumping-injection Technologies in Multi-formations[J].Advanced Engineering Sciences,2022,54(1):167-176.