Pratt may refer to Charles M. Pratt -
an early oilman, he joined up with John D. Rockefeller and became Secretary of Standard Oil. Pratt Institute in Brooklyn is named after him because - well, it seemed a cool thing to do. I don't find any mention of his starting or being in a "Petroleum Club" but it's possible; equally possible that some club founded after his death was named in his honor.
By the looks of it, you have had a busy weekend, my friend.