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The Influence of Well Hydraulics on the Spatial Distribution of Well Incrustations

机译：井水力学对井壁空间分布的影响

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摘要

In many cases, the operation of wells is hampered by the formation of mineral incrustations. From field studies, it is known that the distribution of incrustations in wells is quite inhomogeneous. How models were calculated to assess the hydraulic background of this phenomenon. For horizontal flow, the screen section facing the natural flow direction receives the majority of the total inflow. This phenomenon increases with increasing natural gradients of flow. The vertical distribution of water intake is also quite inhomogeneous. In partially penetrating wells, the uppermost part of the screen receives much more inflow than the deeper screen sections. These flow in-homogenities involve elevated flow velocities and may cause increased influx of shallow, oxygenated water, all conditions favorable for incrustation growth. Field investigations on incrusting wells clearly show that the identified screen areas of elevated flow are indeed much more prone to incrustation deposition. Such sections require more attention during rehabilitations. A suction flow control device can help to homogenize the inflow but can cause elevated entrance loss when affected by incrustation buildup itself.
机译：在许多情况下，井壁的运转会因矿物结壳的形成而受到阻碍。从现场研究中可以知道，井中结壳的分布是非常不均匀的。如何计算模型以评估这种现象的水力背景。对于水平流动，面对自然流动方向的筛网部分接收了总流入量的大部分。这种现象随着自然流量梯度的增加而增加。取水口的垂直分布也很不均匀。在部分穿透的井中，筛网的最上方部分比深筛网部分的流入量大得多。这些不均匀的流动涉及较高的流速，并且可能导致浅水，氧化水的涌入量增加，所有有利于结壳生长的条件。对硬壳井的现场调查清楚地表明，确定的高流量筛网区域确实更容易产生硬壳沉积。这些部分在康复期间需要更多注意。抽吸流量控制装置可以帮助使流入量均匀化，但是当受结垢本身影响时，会导致入口损失升高。

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