New Insights into the Formation and Properties of Wellbore Skin: Why We Have to Rethink the Concept

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Groundwater Pub Date : 2023-12-01 DOI:10.1111/gwat.13370
Georg J. Houben, Axel Lamparter, Kristian Ufer, Christin Damian, Daniel Boz
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Abstract

The deposition of fine-grained material of low permeability on the borehole wall during drilling (wellbore skin) is a common problem affecting the operation and efficiency of water wells. Here, we present new data and novel insights from four excavated dewatering wells from a lignite surface mine. All wells have the same age, are of similar construction, and were sampled at two different depths each. The thickness of the skin layer increases with depth. Its composition and permeability is strongly influenced by the surrounding aquifer material. Nonuniform sediments of low permeability result in less permeable wellbore skin deposits. The presence of discontinuities in the skin layer may be a determining feature for the resulting flow to wells, especially with skin layers of low permeability. The presence of naturally occurring swelling clay (smectite) provides the skin layer with a significant self-sealing capacity.

Abstract Image

对井筒表皮的形成和性质有了新的认识——为什么我们必须重新思考这个概念。
钻井过程中,低渗透细粒物质在井壁上的沉积(井筒表皮)是影响水井作业和效率的常见问题。在这里,我们提出了从褐煤露天矿开挖的四个脱水井的新数据和新见解。所有井年龄相同,构造相似,每口井在两个不同的深度取样。皮肤层的厚度随着深度的增加而增加。其组成和渗透率受周围含水层物质的强烈影响。不均匀的低渗透率沉积物会导致渗透性较差的井筒表皮沉积物。表皮层中不连续性的存在可能是导致流向井的决定性特征,特别是对于低渗透率的表皮层。天然产生的膨胀粘土(蒙脱石)的存在为表皮层提供了显著的自密封能力。这篇文章受版权保护。版权所有。
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来源期刊
Groundwater
Groundwater 环境科学-地球科学综合
CiteScore
4.80
自引率
3.80%
发文量
0
审稿时长
12-24 weeks
期刊介绍: Ground Water is the leading international journal focused exclusively on ground water. Since 1963, Ground Water has published a dynamic mix of papers on topics related to ground water including ground water flow and well hydraulics, hydrogeochemistry and contaminant hydrogeology, application of geophysics, groundwater management and policy, and history of ground water hydrology. This is the journal you can count on to bring you the practical applications in ground water hydrology.
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