Sphaerotilus is a kind of filamentous bacterium with typical sheath forming. It occurs mainly in activated sludge and polluted water.
球衣菌是一种具有典型鞘结构的丝状细菌，广泛存在于活性污泥以及受污染的水体中。
The purpose of perforation is penetrating the casing tube, cement sheath and a certain depth of the formation and forming unhindered channels for oil and gas flowing into the well casing.
射孔目的就是射穿套管、水泥环和地层内一定的深度，为地层的油气流入至井筒，形成一个顺畅的通道。
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