Scope system only based on gradients of Wells SAGD applications (for Steam Assisted gravity drainage)

摘要

A Tool, method and System for estimating distance between two holes. The Hole includes a Conductive Element disposed within a portion of the hole.A Hole Inspection includes an electromagnetic Gradiometer placed inside the hole, and an emitting electrode and a return electrode Spaced along the hole Inspection, preferably in the drilling process.The position of the emitting electrode and the return electrode is selected to optimize the transmission of power to the hole with the objective to increase the electromagnetic field emanating from the Conductive element in a desired Point along the same.When the electrodes and the Gradiometer are transported using a Drill String, are Space units along the chain to minimize Driving current along the drill string. In some depictions, the Gradiometer is placed between the elect Ir Emitter and return.