The phrase "a third well" is correct and usable in written English.
It can be used when referring to the existence of three wells, specifically indicating the third one in a sequence or group.
Example: "After inspecting the first two wells, we finally reached a third well that was hidden behind the trees."
Alternatives: "the third well" or "one more well".
Two had re-creations of the skin on the original craft, and a third — well, we'll get to that one.
It's not that I need a third well; my elaborate underground irrigation system has so many branches a schematic of it would resemble the genealogy of the Windsors.
In the 1970's, a third well was shut down, he said, while a fourth is "questionable" and must be infused with treated water.
The port has been up and running for almost two years, with two of its six berths now complete and a third well on the way.
The petrophysical logs from two wells were used for constructing the intelligent models and a third well from the field was used to evaluate the reliability of the developed models.
A dirt side road, flanked by an orchard of two-year-old almond trees and a field of alfalfa plants, leads to a two-acre patch where workers were drilling a third well.
A third, well-known risk is debt deflation: debts become more onerous because the amount that is owed does not fall, even as earnings do.
A third well-known figure, former Prime Minister Faustino Embali, was arrested, according to the United Nations, though several news reports said he had also been killed.
A third well-known commentator in the Chinese media, Li Qianfan, wrote: "In a country guided by the rule of law, people would not clap their hands in joy over soon being executed.
Each region has a chairperson, who appoints thirty-six voters (he or she being one of them), of whom roughly a third are chefs and restaurateurs, a third food journalists, and a third "well-travelled gastronomes".
Palmer also had two passes dropped that would have resulted in gains of 40 yards or more, and a third well-thrown deep pass fell incomplete because of a botched pass route.
