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A downhole-to-surface communication channel consisting of a long vertical cylinder (the stem) and an isolated downhole in-line cylinder (the electrode) embedded in a homogeneous Earth is considered in this work. A signal voltage is applied between the electrode and stem, and the received voltage is picked up at the surface between the stem and a ground point or between two ground points. The analysis includes consideration of conductor longitudinal and surface impedance, joint resistance, voltage source resistance, and Earth propagation effects to provide a realistic model for assessing the performance of the communication channel for measurement-while-drilling, drill stem testing, and production testing in oil and gas industry applications. Simulation results indicate that consideration of all of these effects is imperative for satisfactory modeling.
Geoscience and Remote Sensing, IEEE Transactions on (Volume:38 , Issue: 6 )
Date of Publication: Nov 2000