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[COUNTABLE] 
At the end of 1952 there were 180 oil wells.
The question of what constituted the first commercial oil well is a difficult one to answer.
Fortunately, another oil well was found just west of the town.
From 1914 to 1939, the total number of oil wells was increased to 35.
At the end of 2008, there were only 87 oil wells still in production.
Seven oil wells in a field of 400 remained on fire today.
American intelligence reported a total of 500 oil wells on fire.
It was one of the first oil wells in Russia.
Two abandoned oil wells can be found on the island.
He supplied the working knowledge about oil wells, I believe, and the other man put up the money.
Wörterbuch für Bergbaubegriffe