At 38,000 square feet in size, they produced average weekly sales of $564,000 translating to sales per square foot of $777, and generated a contribution margin of approximately 6%. These outstanding results, combined with lower average capital investment and pre-opening expenses per store, are driving solid returns.
Drilling rigs commonly operate 24 hours per day, 7 days per week with either three crews working 8 hour shifts or two crews working 12 hour shifts. Most often day crews and night crews will alternate weekly so each crew has a chance to work during both the day and night.
Assume a 2.25 inch pump bore, running 10 strokes per minute, with 30 inches of fluid entering the pump bore each stroke, you would move about 177 barrels of fluid per day. A normal oil well might have an oil cut of 10%, so that well would produce about 18 barrels of oil a day, or about .75 barrels per hour.