解释正在进行封闭-非封闭转换(井损)的阶梯式降压抽水试验。

Ground water Pub Date : 2024-11-04 DOI:10.1111/gwat.13450
Lu Zhang, Hua Zhao, Ling Wang, Jianmei Liu, Qi Zhu, Na Li, Zhang Wen, Yizhao Wang, Dian Wang
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引用次数: 0

摘要

由于抽水速率不断增加,阶梯式抽水试验经常会经历从封闭条件到非封闭条件的过渡。然而,目前的油井水力学模型并不能准确解释这一现象。在本研究中,我们根据吉林斯基电位和叠加理论,开发了一种分析方法来解决阶梯式下抽测试中的致密-非致密转换问题。此外,为了应用所提出的分析解决方案,我们还进行了以封闭-非封闭转换为特征的现场步降抽水试验。采用粒子群优化算法同时估算多个参数。结果表明,与之前的模型相比,新提出的解决方案能更好地拟合抽水井中观测到的抽水情况。据估算,水文地质参数(K、S)、井损系数(B)和封闭-非封闭转换临界时间(tc)分别为 K = 7.15 m/d、S = 6.65 × 10-5、B = 7.48 × 10-6、tc = 1152 min。在阶梯式降水抽水试验中忽略承压-非承压转换,会因高估含水层厚度而低估抽水井内的降水量。从封闭条件转换为非封闭条件后,估计的水井损失系数比转换前的值降低了 88%。这突出表明,有必要调整梯级降水抽水试验模型中的水井损失系数,以考虑承压-非承压转换。总之,本研究介绍了一种解释阶梯式降水抽水试验参数的新方法,并对其有效性进行了实地验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interpreting Step-Drawdown Pumping Test Undergoing Confined-Unconfined Conversion with Well Loss.

The step-drawdown pumping test often experiences a transition from confined to unconfined conditions due to the continuously increasing pumping rate. However, the current well hydraulics model has not accurately interpreted this phenomenon. In this study, we developed an analytical solution to address the confined-unconfined conversion in step-drawdown pumping tests based on Girinskii's potential and superposition theory. Additionally, a field step-drawdown pumping test featuring confined-unconfined conversion was conducted to apply the proposed analytical solution. The particle swarm optimization algorithm was employed to simultaneously estimate multiple parameters. The results demonstrate that the newly proposed solution provides a better fit to the observed drawdown in the pumping well compared to previous models. The hydrogeological parameters (K, S), well loss coefficient (B), and critical time for confined-unconfined conversion (tc) were estimated to be K = 7.15 m/d, S = 6.65 × 10-5, B = 7.48 × 10-6, and tc = 1152 min, respectively. Neglecting the confined-unconfined conversion in step-drawdown pumping tests leads to underestimation of drawdown inside the pumping well due to an overestimation of the aquifer thickness. After the conversion from confined to unconfined conditions, the estimated well loss coefficient decreased by 88% compared to its pre-conversion value. This highlights the necessity of adjusting the well loss coefficient in the step-drawdown pumping test model to account for confined-unconfined conversion. In summary, this study introduces a new method for interpreting parameters in step-drawdown pumping tests and provides field validation for its effectiveness.

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