Schlumberger Technology Corporation

Juergen Zach

Erwann Lemenager

Matthe Contant

Yves G Mathieu

A downhole electromagnetic telemetry unit for use with a tubing string () includes an insulated electrically conductive member () and a processing unit (). The insulated electrically conductive member () is electrically coupled to the tubing string () at an upper measuring point () and a lower measuring point (). The processing unit () is configured to process a voltage difference measured between the upper measuring point () and the lower measuring point () across the insulated electrically conductive member () and to derive therefrom a signal transmitted from a surface location ().

Growing community of inventors

Munich, Georgia

Juergen Zach