Oil and gas fag here. Too hot at 40,000
74 deg F +1.6 deg F /100 feet.
Example-
Given a 10,000 feet well. What temperature is expected at bottom?
74 def F + 1.6 deg F X (10,000/100)= 74 + 160 = 234 deg F.
74 def F+ 1.6 deg F X (40000/100)= 74 + 640 = 714 deg F