Post Trip Fuel Calculation


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What is Post Trip Fuel Calculation?

The gas that enters the well when the mud pump shuts off and the pipe is removed from the well bore is called trip fuel / gas.

When the pump shuts off, gas may enter due to a decrease in the pressure in the bottom hole, due to sweeping, or both.

Avgas (100-130 or 100-130LL) weight is calculated at 6 pounds per gallon; Jet A (jet fuel) 6.84 pounds per gallon. Weights are accepted based on specific gravity and other variables, such as temperature and climate.

Trip margin

The extra sludge weighs a small amount which is needed to balance the pressure of the formation when sweeping after exiting the hole to control the effects of the pressure drop created by the sweep.

Bottom up

1. A complete journey from the bottom of the wheel to the top. The mud and cuttings that are calculated or measured to come from under the hole since the beginning of the rotation are called bottom ups.

Bottom hole pressure test

A test that measures the pressure of a well's reservoir is obtained at a certain depth or in the middle of a production zone. The bottom hole pressure test measures the pressure during the flow of the well. A shut-in bottom hole pressure test measures the pressure after closing the well for a certain period of time.


The process of waving the drill stem and returning it to the well. V: Abbreviation for "Take a Journey".

Gas anchor

A tubular, perforated device attached to the bottom of a sucker-rod pump that helps prevent gas locks. This device works on the principle that gas rises because it is lighter than oil.

Shut down bottom hole pressure test

A lower hole pressure test that measures the pressure after closing a well for a certain period of time. See the hole pressure test below.

Trip tank

A small earthen tank with a capacity of 10 to 15 barrels, usually with 1-barrel or h-barrel divisions, is used to determine the amount of sludge required to fill a well. Removed by drill pipe.


Calculate fuel consumption after travel.

Enter the fuel capacity in gallons for all tanks = 25.

Enter gallon per hour (GPH) consumption rating = 1.

Enter the travel time in hours = 15.

Enter the start of trip fuel in gallons in all tanks = 25.


Apply the formula:

Weight of aviation petrol per gallon (gw) = 6.00

Jet A weight per gallon (dw) = 6.84

Total Capacity (AvGas) Fuel Load Weight = (Fuel Weight) * (gw)

Calculated fuel raining = (st) - ((tt) * (gph))

Initial fuel load = fuel weight * tank

Current fuel load = fuel by weight of fuel;

Your calculated fuel ramming = 10.00 (gallons)

Initial fuel load = 0.00 (gallon)

Current fuel load = 15.00 (gallons)

Topping tanks (AvGas) will increase the current weight = 90.00 (pounds)

Topping tank (Jet A) will increase the current weight = 102.60 (pounds)