12.11.24 StimJobStep

Topic Version	1	Published	11/11/2016	Topic Change History
For Standard	WITSML v2.0
Type:	Class		Stereotype:	«XSDcomplexType»

A step in the treatment of a stage for a stimulation job.

Table 12.11.24-1 Attributes
Name	Type	Notes
AvgBaseFluidQuality	VolumePerVolumeMeasure	Base quality percentage of foam.
AvgCO2BaseFluidQuality	VolumePerVolumeMeasure	Base quality carbon dioxide percent of foam.
AvgHydraulicPower	PowerMeasure	Average hydraulic horse power used.
AvgInternalPhaseFraction	VolumePerVolumeMeasure	Internal gas phase percentage of the foam.
AvgMaterialUsedRate	StimMaterialQuantity	Average material used per minute entering the flow stream.
AvgMaterialUseRateBottomhole	StimMaterialQuantity	Average material amount used (pumped) per minute at bottomhole.
AvgN2BaseFluidQuality	VolumePerVolumeMeasure	Base quality nitrogen percentage of foam.
AvgPresBottomhole	PressureMeasure	Average bottomhole pressure.
AvgPresSurface	PressureMeasure	Average surface pressure.
AvgPropConc	MassPerVolumeMeasure	Average proppant concentration at the wellhead. ppa: pounds proppant added per volume measure kgpa: kilograms proppant added per volume measure
AvgProppantConcBottomhole	MassPerVolumeMeasure	The average proppant concentration at bottomhole.
AvgProppantConcSurface	MassPerVolumeMeasure	The average proppant concentration at the surface.
AvgSlurryPropConc	MassPerVolumeMeasure	Average proppant concentration exiting the equipment.
AvgSlurryRate	VolumePerTimeMeasure	Average slurry return rate.
AvgTemperature	ThermodynamicTemperatureMeasure	Average fluid temperature.
AvgVolumeRateWellhead	VolumePerTimeMeasure	Average volume per minute at the wellhead.
BallsRecovered	NonNegativeLong	Balls recovered during execution of the step.
BallsUsed	NonNegativeLong	Balls used during execution of the step.
BaseFluidBypassVol	VolumeMeasure	Base fluid volume recorded after equipment set to bypass.
BaseFluidVol	VolumeMeasure	Base fluid volume entering the equipment.
Description	String2000	A short description of the step.
DTimEnd	TimeStamp	Date and time the step ended.
DTimStart	TimeStamp	Date and time the step started.
EndDirtyMaterialRate	VolumePerTimeMeasure	Ending dirty fluid pump volume per minute.
EndMaterialUsedRate	StimMaterialQuantity	Ending quantity of material used per minute entering the flow stream.
EndMaterialUsedRateBottomhole	StimMaterialQuantity	Ending quantity of material used per minute at bottomhole.
EndPresBottomhole	PressureMeasure	Final bottomhole pressure.
EndPresSurface	PressureMeasure	Final surface pressure.
EndProppantConcBottomhole	MassPerVolumeMeasure	The final proppant concentration at bottomhole.
EndProppantConcSurface	MassPerVolumeMeasure	The final proppant concentration at the surface.
EndRateSurfaceCO2	VolumePerTimeMeasure	Final CO2 pump rate in volume per time at the surface.
EndStdRateSurfaceN2	VolumePerTimeMeasure	Final nitrogen pump rate in volume per time at the surface.
ExtensionNameValue	ExtensionNameValue	Extensions to the schema based on a name-value construct.
FluidVolBase	VolumeMeasure	The step volume of the base step.
FluidVolCirculated	VolumeMeasure	Fluid volume circulated.
FluidVolPumped	VolumeMeasure	Fluid volume pumped.
FluidVolReturned	VolumeMeasure	Fluid volume returned.
FluidVolSlurry	VolumeMeasure	The volume of the slurry (dirty) step.
FluidVolSqueezed	VolumeMeasure	Fluid volume squeezed.
FluidVolWashed	VolumeMeasure	Fluid volume washed.
FractureGradientFinal	ForcePerVolumeMeasure	The fracture gradient when the step ends.
FractureGradientInitial	ForcePerVolumeMeasure	The fracture gradient before starting the step.
FrictionFactor	DimensionlessMeasure	Numeric value used to scale a calculated rheological friction.
Kind	String2000	The type of step.
MaxHydraulicPower	PowerMeasure	Maximum hydraulic power used during the step.
MaxPresSurface	PressureMeasure	Maximum pumping pressure on surface.
MaxProppantConcBottomhole	MassPerVolumeMeasure	Maximum proppant concentration at bottomhole during the stimulation step.
MaxProppantConcSurface	MassPerVolumeMeasure	Maximum proppant concentration at the wellhead.
MaxSlurryPropConc	MassPerVolumeMeasure	Maximum proppant concentration exiting the equipment.
MaxVolumeRateWellhead	VolumePerTimeMeasure	Maximum volume per minute at the wellhead.
PipeFrictionPressure	PressureMeasure	The friction pressure contribution from pipes.
PumpTime	TimeMeasure	Total pumping time for the step.
StartDirtyMaterialRate	VolumePerTimeMeasure	Starting dirty fluid volume per minute.
StartMaterialUsedRate	StimMaterialQuantity	Starting quantity of material used per minute entering the flow stream.
StartMaterialUsedRateBottomHole	StimMaterialQuantity	Starting quantity of material used per minute at bottomhole.
StartPresBottomhole	PressureMeasure	Starting bottomhole pressure.
StartPresSurface	PressureMeasure	Starting surface pressure.
StartProppantConcBottomhole	MassPerVolumeMeasure	The beginning proppant concentration at bottomhole.
StartProppantConcSurface	MassPerVolumeMeasure	The beginning proppant concentration at the surface.
StepName	String2000	A human readable name for the step.
StepNumber	PositiveLong	Step number.
uid	String64	Unique identifier for this instance of StimJobStep.
WellheadVol	VolumeMeasure	Slurry volume entering the well.

Table 12.11.24-2 Associations
Association	Notes
From: StimJobStep.Fluid 0..1To: StimFluid Association
From: StimJobStep.MaterialUsed 0..*To: StimMaterialQuantity Association	This is the total quantities of materials pumped—water, proppant and additives—over just this step.
From: StimJobStep.MaxMaterialUsedRate 0..*To: StimMaterialQuantity Association
From: StimJobStage.JobStep 0..*To: StimJobStep Association