Which type of cable is referred to as the main line that drops down into the well?

The main line that drops down into the well is referred to as the drill line. This type of cable is specifically designed for drilling operations and is used to transmit torque and lift the drilling tools or equipment out of the well or down into it. The drill line is robust and has high tensile strength to handle the significant stresses and loads associated with drilling, including the weight of the drill string and the associated equipment.

In the context of well drilling, the drill line serves as the primary means of control over the drilling apparatus, making it critically important for the efficiency and safety of the drilling operation. Its construction typically involves multi-strand wire rope, which provides the durability needed for repeated use in the challenging conditions of well drilling.

Other types of lines mentioned, such as the sand line, wire rope, and overshot line, serve different functions. For example, the sand line is often used for lighter applications, such as retrieving tools from shallow wells or handling lighter loads. Wire rope is a general term that encompasses various uses beyond just drilling, and an overshot line is specifically used for deploying an overshot tool, which is a type of fishing tool used to recover stuck equipment from a well. Thus, while these other lines may be important in various contexts