Originally Posted by
Skysooner
No since the gravity feed means that the pressure of the water in the well is higher than the pressure in the zone. Eventually this changes and when they equalize, it won't flow anymore. Remember also there are frictional forces in the pipe as well. Even if you are using a pressure pump on the surface at least part of that pressure is going to friction, the rest is going to get a high enough rate of injection into the formation so that it will enter. If you use too much pressure though, you can overpressure a zone and fracture it. That is basically what fracking is anyway. Once the pressure drops though the zone heals itself and generally won't allow flow since the rock above and below oil zones is pretty impermeable.