Which mechanisms of water intrusion into oil wells are relatively easily controlled (select four only):
__ Watered-out layer without crossflow.
__ Fractures between injector and producer.
__ Moving oil/water contact.
__ Coning.
__ Cusping.
__ Casing leaks.
__ Edge water from poor areal sweeps.
__ Gravity segregated layer in a thick reservoir layer with high-vertical permeability.
__ Channel flow behind the casing from primary cementing that does not isolate water-bearing zones from the pay zone.
__ Fractures or faults from behind the water zone.
A fairly straighforward problem; you will either know it or you won't (depending on how well read or experienced one is). I'll update this problem answer later, to let the problem "sink in" and become ingrained in your mind. Remember, there are a dozen ways this probllem could be asked, so one must have a true understanding if it to be safe!
