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。
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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