Lead wires are electrically connected with the detecting section and outwardly extend through an axially other end side of the casing.
引线电连接探测部分，并在外壳的轴向另一末端向外伸出。
2
Casing corrosion could lead to cross-flow of re-injected sewage and even threatens fresh drinking water layers.
套管腐蚀会导致回注污水窜层，甚至威胁到饮用淡水层。
3
The casing-patch tool is lowered into the well where rubber or lead on the end of the tool is used to seal against the top of the cut casing remaining in the well.