Final answer:
In primary recovery's water drive, natural reservoir pressure drives oil and natural gas to the surface, with water moving to replace extracted oil. Recovered water from this process is stored in open pits and sent to a treatment plant for removal of contaminants.
Step-by-step explanation:
In water drive during primary recovery, natural pressure in the reservoir pushes hydrocarbons towards the surface. As oil is extracted, water in the reservoir moves to replace the oil that has been removed. This water is often referred to as the 'aquifer'. The natural gas flows out of the well along with the oil, driven by the same pressure. However, sometimes the recovered water is produced with the oil and gas. This recovered water needs to be stored and managed properly to minimize environmental impact. Typically, it is temporarily stored in open pits, before being transported to a treatment facility, where it undergoes various processes to remove oil, chemicals, and other contaminants.