ABSTRACT:

The capability of a new ultra-deep resistivity measurement has been studied. The new measurement targets the detection of remote bed boundaries up to 10m away from the drill bit. Based on a numerical modelling and sensitivity study, we have arrived at a set of optimal tool parameters. A three-coil system was used with transmitter-receiver spacings of 12m and 17m. Two operating frequencies were chosen: 20 and 50kHz. These parameters yield optimal performance in terms of measurement sensitivity to a remote bed boundary. To interpret the data, we implemented an inversion method to quantitatively determine the distance from the tool to a remote bed. We have also investigated the impact of the nature of the resistivity transition zone on the distance determination

This content is only available via PDF.
You can access this article if you purchase or spend a download.