How to identify and describe low and non-effective circulation layers is one of important challenges of high efficient oilfield development in ultra-high water cut stage.

如何识别描述低效、无效循环层已经成为油田特高含水期水驱高效开发的一个重要问题。

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To research a waste water treatment technology of low energy consumption, ABR acidification and two-stage constructed wetlands method was used to treat sewage.

为研究低能耗污水处理技术，采用ABR(厌氧折流板)酸化反应器-两级人工湿地工艺处理生活污水。

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The basic law of injection development is the injection development at the early stage, fast water-cut rising and low recovery degree at middle stage.

注水开发的基本规律是：注水开发早、中期含水上升速度快，采出程度低，相当多的水驱可采储量要在高含水期采出。

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Other improvements to the harbour include a low-water landing stage, lighting, signage and CCTV.

BBC: Newquay harbour