Optimized arrays for look ahead-of-bit applications

摘要

Various embodiments include apparatus and methods of operation with respect to well logging. Apparatus and methods include a tool having an arrangement of transmitters and receivers to capture a signal from a first region relative to the tool such that signal contributions from a second region relative to the tool are cancelable, based on placement of the transmitters and receivers with respect to each other. Additional apparatus, systems, and methods are disclosed.

主权项

1. A system to measure signals indicative of properties downhole, the apparatus comprising:
a tool having an arrangement of transmitters and receivers along a longitudinal axis of the tool to capture, when the tool is disposed downhole, signals from a first downhole region in response to activation of the transmitters; and a control unit to control activation of the transmitters and signal acquisition of the receivers to process signals received from the receivers, wherein the placement of the transmitters and receivers with respect to each other is such that signal contributions from a second downhole region in the vicinity of the tool are substantially canceled by the control unit structured to process a specified combination of the signals received from the receivers, based on the placement of the transmitters and receivers with respect to each other, the placement correlated to location of the first and second downhole regions relative to the tool.