Research on the influence of dynamic contact angle of mercury meniscus on the interpretation of rock pore throat radius in mercury intrusion experiments

IF 2 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Frontiers in Earth Science Pub Date : 2024-08-05 DOI:10.3389/feart.2024.1434211

Jinyou Dai, Sha Pi, Junzhe Wu, Yang Zhang

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Abstract

Addressing the lack of measurement methods for dynamic contact angles of mercury meniscus in mercury intrusion porosimetry experiments and the unclear understanding of the impact of dynamic contact angles on the interpretation of pore throat radius in rocks, a new type of closed mercury intrusion characteristic curve (O-R curve) is constructed utilizing the withdrawal curve O and the secondary injection curve R obtained from the experiments. Based on the excellent wetting and de-wetting correlation characteristics at the equal mercury saturation points on this curve, a method for measuring the dynamic contact angles of mercury meniscus (O-R loop method) is established. Taking the Chang 63 tight oil reservoir samples from the Nanliang Oilfield in the Ordos Basin of China as an example, this method is applied to investigate the dynamic contact angles of mercury meniscus in mercury intrusion porosimetry experiments and the impact on the interpretation of pore throat radius in rocks. The results indicate that the dynamic contact angles of mercury meniscus changes significantly during the experiments, which cannot be ignored. And the smaller pore throats lead to more severe deformation of mercury meniscus, resulting in higher wetting resistance coefficients and hysteresis angles. Calculations reveal that the pore throat radius interpreted using the modified Washburn equation (which adopts dynamic contact angles) are generally larger than those interpreted using the conventional Washburn equation (which adopts static contact angles), with relative errors ranging from 12.2% to 54.7%. The smaller the pore throats, the larger the relative errors. The analysis shows that the conventional Washburn equation significantly underestimates the reservoir pore throat radius due to the neglect of the dynamic contact angle, while the modified Washburn equation provides more accurate interpretation. Overall, this research provides a method for calculating the dynamic contact angle in mercury intrusion porosimetry experiments and has important reference significance for the accurate interpretation of rock pore throat radius.

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汞侵入实验中汞半月板动态接触角对岩石孔喉半径解释的影响研究

针对汞侵入孔隙模拟实验中缺乏汞半月板动态接触角的测量方法，以及对动态接触角对岩石孔喉半径解释的影响认识不清的问题，利用实验得到的抽出曲线 O 和二次注入曲线 R，构建了一种新型闭合汞侵入特征曲线（O-R 曲线）。根据该曲线上汞饱和度相等点的优异润湿和脱湿相关特性，建立了一种测量汞半月板动态接触角的方法（O-R 循环法）。以中国鄂尔多斯盆地南梁油田长 63致密油藏样品为例，应用该方法研究了汞侵入孔隙模拟实验中汞半月板的动态接触角及其对岩石孔喉半径解释的影响。结果表明，汞半月板的动态接触角在实验过程中会发生显著变化，这一点不容忽视。孔喉越小，汞半月板的变形越严重，从而导致润湿阻力系数和滞后角越大。计算表明，使用修正的 Washburn 方程（采用动态接触角）解释的孔喉半径普遍大于使用传统的 Washburn 方程（采用静态接触角）解释的孔喉半径，相对误差在 12.2% 到 54.7% 之间。孔隙越小，相对误差越大。分析表明，由于忽略了动态接触角，传统的沃什伯恩方程大大低估了储层孔喉半径，而修正的沃什伯恩方程则能提供更准确的解释。总之，该研究为汞侵入孔隙模拟实验中动态接触角的计算提供了一种方法，对准确解释岩石孔喉半径具有重要的参考意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Frontiers in Earth Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

3.50

自引率

10.30%

发文量

2076

审稿时长

12 weeks

期刊介绍： Frontiers in Earth Science is an open-access journal that aims to bring together and publish on a single platform the best research dedicated to our planet. This platform hosts the rapidly growing and continuously expanding domains in Earth Science, involving the lithosphere (including the geosciences spectrum), the hydrosphere (including marine geosciences and hydrology, complementing the existing Frontiers journal on Marine Science) and the atmosphere (including meteorology and climatology). As such, Frontiers in Earth Science focuses on the countless processes operating within and among the major spheres constituting our planet. In turn, the understanding of these processes provides the theoretical background to better use the available resources and to face the major environmental challenges (including earthquakes, tsunamis, eruptions, floods, landslides, climate changes, extreme meteorological events): this is where interdependent processes meet, requiring a holistic view to better live on and with our planet. The journal welcomes outstanding contributions in any domain of Earth Science. The open-access model developed by Frontiers offers a fast, efficient, timely and dynamic alternative to traditional publication formats. The journal has 20 specialty sections at the first tier, each acting as an independent journal with a full editorial board. The traditional peer-review process is adapted to guarantee fairness and efficiency using a thorough paperless process, with real-time author-reviewer-editor interactions, collaborative reviewer mandates to maximize quality, and reviewer disclosure after article acceptance. While maintaining a rigorous peer-review, this system allows for a process whereby accepted articles are published online on average 90 days after submission. General Commentary articles as well as Book Reviews in Frontiers in Earth Science are only accepted upon invitation.