An underground layer of common rock

A code to indicate the type of fracture performed in the stage operation

The depth of the well to the top of the permanent plug for the stage

The instantaneous shut-in pressure recorded after treatment fluid has been injected into the formation.

A value for the pressure needed to break the formation. This is the minimum amount of pressure that can cause a subsurface rock layer to fracture.

Average pressure used in the stage operation

The pressure gradient at which the formation interval breaks down and accepts fluid, expressed in units of kpa/m.

The maximum, minimum, and average injection rates reached in the stage operation.

The injection rates are for slurry/dirty fluids, and for clean fluids.

A code to describe the completion design used.

The size of the ball used in the fracturing process.

The maximum, minimum, and average hydraulic horse power used in the stage operation typically expressed in units of hhp (hydraulic horse power) or kw (kilowatt).

The type of proppant used in the hydraulic fracture treatment fluid. Examples include sand, aluminum oxide pellets, glass beads, etc.

The sum of the amounts of proppant used in the treatment fluid.

The acid type used in the spearhead operation, generally denoted by a code

A code to define the type of base fluid used in the fracturing process

A code to define the type of chemical tracer used in the operation

The code assigned to the radioactive tracer used.

A code to indicate whether an energizer agent was used in the operation. Values are foam, energized, or none.

A code to indicate the type of energizer used in the operation.

A code to indicate the type of gel fluid used in the operation

The volume of material used in the spearhead stage of the fracture process, the purpose of which is to clear debris in the borehole to provide a pathway for fracture fluids to access the formation

The volumes of clean and slurry fluids pumped during the stage operation.

The total volume of CO2 or N2 pumped during the stage operation.

The temperature of the CO2 and N2 during the pumping operation.