渗透率及其水平各向异性对CO2封存提高煤层气采收率的影响——基于阶段CH4输出抑制的定量评价

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Frontiers of Earth Science Pub Date : 2023-11-22 DOI:10.1007/s11707-022-1039-5
Ziliang Wang, Shuxun Sang, Xiaozhi Zhou, Xudong Liu, Shouren Zhang
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引用次数: 0

摘要

渗透率及其水平各向异性对阶段CH4输出抑制过程产生关键影响。然而,对这种影响的定量评价在文献中很少报道。本文研究了水平各向异性渗透率对CO2-ECBM的影响。分析了阶段CH4输出抑制的变化。首次建立了CO2-ECBM工艺的理想驱替曲线。讨论了不同井眼CH4产量的变化规律。结果表明:1)低渗透或弱各向异性储层抑制时间较长,不利于提高CH4采收率(>1091天)和高抑制水平(>36.9%)。随着渗透率和各向异性的增加,由于自由水的加速渗流,滞回时间和抑制时间可缩短至5 d和87 d,抑制水平可降低至5.00%。CH4输出量和CO2注入量显著增加。2)然而,高渗透率和强各向异性容易导致CO2突破,导致CH4产量、CO2注入和CO2储存量低于预期。同时保持CO2的高效储存(>99%),将CO2突破浓度从10%提高到20%可能会缓解这一不利趋势。3)沿流体流动方向,理想驱替剖面由CO2富滩、CO2与CH4混合滩、CH4富滩和富水滩组成,优势渗流方向和非优势渗流方向的驱替剖面存在显著差异。4)不同井眼的CH4产量潜力差异较大。沿优势渗流方向的生产者在短期内具有更大的CH4开采潜力,而沿非优势渗流方向的生产者只有采取长期注入措施才能避免失效。这些发现为在CO2-ECBM过程中了解实际复杂储层的流体渗流并开展进一步的现场项目铺平了道路。
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Effect of permeability and its horizontal anisotropy on enhanced coalbed methane recovery with CO2 storage: quantitative evaluation based on staged CH4 output inhibition

The permeability and its horizontal anisotropy induce a critical influence on staged CH4 output inhibition process. However, a quantitative evaluation of this influence has been rarely reported in the literature. In this work, the impact of horizontal anisotropic permeability on CO2-ECBM was numerically investigated. The variation in the staged CH4 output inhibition was analyzed. The ideal displacement profile of the CO2-ECBM process was established for the first time. Moreover, the variation in CH4 output of different wellbores was discussed. The results showed that 1) low-permeable or weak-anisotropic reservoirs were not conducive to enhanced CH4 recovery owing to long inhibition time (> 1091 days) and high inhibition level (> 36.9%). As permeability and anisotropy increased, due to the accelerated seepage of free water, the hysteresis time and inhibition time could decrease to as short as 5 days and 87 days, respectively, and the inhibition level could weaken to as low as 5.00%. Additionally, the CH4 output and CO2 injection could increase significantly. 2) Nevertheless, high permeability and strong anisotropy easily induced CO2 breakthrough, resulting in lower CH4 production, CO2 injection and CO2 storage than expected. While maintaining high efficiency of CO2 storage (> 99%), upregulating CO2 breakthrough concentration from 10% to 20% might ease the unfavorable trend. 3) Along the direction of fluid flow, the ideal displacement profile consisted of CO2 enriched bank, CO2 and CH4 mixed bank, CH4 enriched bank, and water enriched bank, whereas a remarkable gap in the displacement profiles of the dominant and non-dominant seepage directions was observed. 4) The potential of CH4 output might vary greatly among different wellbores. The producers along the dominant seepage direction held more potential for CH4 recovery in the short-term, while those along the non-dominant seepage direction avoided becoming invalid only if a long-time injection measure was taken for the injectors. These findings pave the way to understand fluid seepage in real complex reservoirs during CO2-ECBM and conduct further field projects.

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来源期刊
Frontiers of Earth Science
Frontiers of Earth Science GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
5.00%
发文量
627
期刊介绍: Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities
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