The greatest depth reached by a well bore.
To reach the objective depth in drilling a well. Often abbreviated to "TD".
Descriptive of a well reaching the intended depth.
The target depth for a well. The achieved (drilled) depth in a well at any one time.
The final depth to which the well is drilled, that is, the depth at which the drill bit stops its forward penetration.
TD. The total depth reached by drilling tools.