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An experimental study on the permeability changes of anthracite reservoirs in different depths of Qinshui Basin induced by supercritical CO2 injection
Energy Science & Engineering ( IF 3.8 ) Pub Date : 2019-11-19 , DOI: 10.1002/ese3.555
Jia Jinlong 1, 2 , Cao Liwen 3
Affiliation  

Geological sequestration of supercritical CO2 (ScCO2) in deep coal seam has been considered as one of the most promising options for reducing greenhouse gas emission. The permeability of a coal seam, a key parameter estimating the CO2 injectivity, determines the success of ScCO2 storage in the deep coal seam. The deep coal seam has a low initial permeability and a further permeability loss induced by the adsorption‐swelling effects of coal during ScCO2 injection. This paper presents a set of measurements on the permeability changes of anthracite reservoirs in different depths of Qinshui Basin induced by ScCO2 injection. The results indicate that the change in anthracite permeability presents a negative exponential decrease with the buried depth increase. The depth of anthracite reservoir increases from 800 to 1400 m, and its permeability will decrease from 4.59 × 10−2 to 8.04 × 10−4 mD. The permeability change induced by ScCO2 injection is the combining effects of temperature, pressure, and adsorption‐swelling, and the permeability change can be described by a negative exponential model during ScCO2 injection to anthracite reservoir in different depths. The loss coefficient of permeability is up to three magnitudes induced by ScCO2 injection to the anthracite reservoir in the depth of 800 m, 2‐3 magnitudes in 1000‐1200 m, and 1‐2 magnitudes in 1400 m. Although the initial permeability of anthracite reservoirs in the same depth exists differences, the permeability loss coefficient almost has the same magnitudes induced by ScCO2 injection. Comparing with the permeability loss coefficient of the anthracite reservoir in different depths, the permeability variation of the shallow coal seam is more sensitive than the deep induced by ScCO2 injection. However, the deep coal seam has a relatively large fracture pressure, so the allowable ScCO2 injection pressure in the deep coal seam is greater than the shallow.

中文翻译:

超临界CO2注入引起沁水盆地不同深度无烟煤储层渗透率变化的实验研究

深煤层中超临界CO 2(ScCO 2)的地质隔离被认为是减少温室气体排放的最有希望的选择之一。煤层的渗透率是估计CO 2注入量的关键参数,它决定了深层煤层中ScCO 2储存的成功。深煤层的初始渗透率低,并且由于注入ScCO 2期间煤的吸附溶胀作用而导致的渗透率损失进一步增加。本文提出了一套由ScCO 2引起的沁水盆地不同深度无烟煤储层渗透率变化的测量方法。注射。结果表明,随着埋深的增加,无烟煤渗透率的变化呈负指数下降。无烟煤储层深度从800 m增加到1400 m,渗透率将从4.59×10 -2减小到8.04×10 -4  mD。ScCO 2注入引起的渗透率变化是温度,压力和吸附膨胀共同作用的结果,ScCO 2注入不同深度的无烟煤储层过程中的渗透率变化可以用负指数模型来描述。ScCO 2引起的磁导率损耗系数高达三个量级注入无烟煤储层的深度为800 m,1000至1200 m为2-3级,1400 m为1-2级。尽管在相同深度下无烟煤储层的初始渗透率存在差异,但渗透率损失系数几乎与注入ScCO 2引起的幅度相同。与不同深度无烟煤储层的渗透率损失系数相比,浅层煤层的渗透率变化比注入ScCO 2引起的深层更敏感。然而,深煤层具有相对较大的破裂压力,因此深煤层中的容许ScCO 2注入压力大于浅煤层。
更新日期:2019-11-19
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