Directional drilling is how they will intercept the existing well. They know exactly where the pipe is they want to intercept in relation to the current drilling rig. By constantly taking surveys while drilling is in process they will know where they are at all times. When they get close to their target pipe they will be able to pick up magnetic anomalies which help with the precision streering of the downhole drill motor to make a perfect intercept.
At least that is how it is supposed to work.
The directional drilling technology advancement in the last few years have been tremendous. Logging while drilling, steerable drilling, directional gyros, magnetic tracking and downhole instrumentation such as temperature and pressure. It is just amazing to me.
It would seem so.