Water coning can force oil and gas away from the pipe 3. Gas cap pressure maintenance can fail, dropping pressures to below that required to drive the oil and gas to the wellbore. Pressure compartments must be delineated, but often are guessed at 6. Leaky faults can deliver gas to oil reservoirs, water to gas, and all combinations-pressure differential across the fault, which varies with time, is the controller. Advantages of 4D 1.
Monitoring can obviously spot problems before no-monitoring can.
Remedial action often just involves regulation of the choke-sizes of the various wells producing from any given reservoir. Those chokes are not automated, and are hardly ever changed. These are seldom done because the pressure instruments are not routinely in place. Gas caps better be where you think they are, when you want them to be, or severe damage can be done to production efficiency. 4D seismic monitoring is an excellent gas locator in most rocks.