Primary Recovery

New conventional oil reservoirs almost always start producing under primary recovery.

Primary recovery means that we utilize the natural energy of the fluids in the reservoir to recover the oil that is contained there. The types of oil that Zargon produces contain natural gas dissolved in the oil at reservoir conditions (temperature and pressure). As fluids are removed from the reservoir, the pressure will normally decline and cause gas to be liberated from the oil (this is called solution gas). The liberated solution gas expands and helps to push the oil in the reservoir to the producing wells.

In some cases, the oil reservoir is connected to an underground water aquifer where natural water influx helps to maintain the reservoir pressure at about the same pressure as when the reservoir was discovered. 

This primary recovery mechanism will generally lead to recovery of only 15% (or less) of the initial oil-in-place in the reservoir. In cases where the reservoir is connected to an aquifer, the extra pressure support can increase overall recovery to perhaps 40% or more of the oil-in-place, depending on the characteristics of the oil.