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Traditionally, the steering of horizontal wells has been based<br>on logging-while-drilling measurements that rely on the<br>sensors to actually measure the formation’s characteristics<br>when drilling through it and then use this information to make<br>the correct steering decision. This approach is a reactive one,<br>however. The implementation of deep and directional<br>electromagnetic measurements that can detect approaching<br>boundaries enables us to implement a proactive steering<br>approach.