"Oil wells" refers to holes dug into the ground to extract oil. These wells allow oil companies to access underground oil reserves that are used to produce fuel for our cars, heat for our homes, and many other products. Full definition
Really, a powerful sales letter is like having a little oil well in the backyard, pumping out money for you, day and night. (entrepreneur.com)
Not only acute sufferers get to effectively relieve their constipation, chronic sufferers find eating coconut oil good for their chronic condition too. (fussybody.com)