Pipes Functions
Drilling KPI
Mechanical Specific Energy - MSE
Calculates the mechanical specific energy for the given well
og.model.general.mse(
newmap("wellId", "{well_id}",
"weightOnBit", value_N,
"rotarySpeed", value_rad/s,
"torqueOnBit", value_N.m,
"rateOfPenetration", value_m/s)
)
Output: MSE (Pa)
Hydraulic Mechanical Specific Energy - HMSE
Calculates the hydraulic mechanical specific energy for the given well
og.model.general.hmse(
newmap("wellId", "{well_id}",
"weightOnBit", value_N,
"rotarySpeed", value_rad/s,
"torqueOnBit", value_N.m,
"rateOfPenetration", value_m/s,
"fluidFlow", value_m3/s,
"bitPressureLoss" value_Pa,
"energyReductionFactor", value)
)
Output: HMSE (Pa)
Drilling Specific Energy - DSE
Calculates the drilling specific energy for the given well
og.model.general.dse(
newmap("wellId", "{well_id}",
"weightOnBit", value_N,
"rotarySpeed", value_rad/s,
"torqueOnBit", value_N.m,
"rateOfPenetration", value_m/s,
"bitHydraulicPower", value_,
"lambda" value)
)
Output: DSE (Pa)
d-Exponent
Calculates the d-exponent for the given well
og.model.general.dExponent(
newmap("wellId", "{well_id}",
"weightOnBit", value_N,
"rotarySpeed", value_rad/s,
"rateOfPenetration", value_m/s)
)
Output: d-exponent (-)
Volumes and Sizes
Well Volume
Given a well, this function computes the volume between two well locations.
Obs: These methods (well, Well between, and Well in Region) do not take into account the material of the work column, it only considers the space available for fluid (drilling mud, cement, etc). For work column volume, refer to og.model.general.pipeDisplacement.
og.model.general.wellVolume(
newmap("wellId", "{well_id}")
)
Well Volume Between
Given a well, this function computes the volume between two well locations.
startPosition: Starting location where volume will be computed ({measuredDepth: number, isAnnular: boolean})
endPosition: Starting location where volume will be computed ({measuredDepth: number, isAnnular: boolean})
og.model.general.wellVolumeBetween(
newmap("wellId", "{well_id}",
"startPosition", {measuredDepth: number, isAnnular: boolean},
"endPosition", {measuredDepth: number, isAnnular: boolean},
)
)
Well Volume in Region
Given a well, this function computes the volume between two well locations. The expected parameters are: isAnnular: flag indicating if region is annular or not (boolean)
og.model.general.wellVolumeInRegion(
newmap("wellId", "{well_id}",
"isAnnular", value_boolean
)
)
Pipe Displacement
Calculates the pipe displacement (steel total volume) for the given well
og.model.general.pipeDisplacement(
newmap("wellId", "{well_id}",
"bitDepth", value_m)
)
Output: Pipe Displacement (m3)
Open Hole Start Depth
Shows the last casing shoe measured depth
og.model.general.openHoleStartDepth(
newmap("wellId", "{well_id}")
)
Well JSON
og.model.general.wellJSON(
newmap("wellId", "{well_id}")
)
Equivalent Geometry
og.model.general.equivalentGeometry(
newmap("wellId", "{well_id}")
)
Bottom’s up time
Calculates the time the fluid takes to travel through a well portion. For this function, the flow rate and depth are fixed during all periods of time.
og.model.general.fluidCourseTime(
newmap("wellId", "{well_id}"
"bitDepth", value_m,
"fluidFlow", value_m3/s,
"isAnnular", boolean)
)
Output: Bottom’s up time (s)
Example Pipes:
=> og.model.general.fluidCourseTime( newmap(
'wellId', '11',
'bitDepth', BITDEP#*0.3048, --ft to meters
'fluidFlow', FLOWIN#*0.000063090196, -- gpm to m3/s
'isAnnular', true)
) every minute -- output is in seconds
=>_#/60 as {bottom_up [min]}
Example Pipes
Calculate annular volume and annular velocity
-- Annular Volume
def @@fluid_flow: 0.05; --m3/s
def @@bit_depth: 1000; --m
=> og.model.general.fluidCourseTime(
newmap("wellId", "1"
"bitDepth", @@bit_depth,
"fluidFlow", @@fluid_flow,
"isAnnular", true)
)->result/@@fluid_flow as annular_volume
--Annular Velocity (average)
=> og.model.general.fluidCourseTime(
newmap("wellId", "1"
"bitDepth", @@bit_depth,
"fluidFlow", @@fluid_flow,
"isAnnular", true)
)->result as bottom_up_time
=>@@bit_depth/bottom_up_time as annular_velocity
Lag Depth and Lag Time (only Fluid)
Calculates lag time and lag depth for a given interval of data, only using the information of fluid flow, i.e, do not take into account the cuttings velocities (see on cuttings this feature).
og.model.general.lagTime(
newmap("wellId", "{well_id}"
"bitDepth", value_m,
"intervalData</span>", value)
)
Fluid Properties
Rheometer Calculations
Calculate shear rate and Shear Stress from rheometer readings
og.model.general.shearRateShearStressFromRheometer(
newmap(
"rheometerReadings", newmap(
3.0, value_theta_rpm3,
6.0, value_theta_rpm6,
100.0, value_theta_rpm100,
200.0, value_theta_rpm200,
300.0, value_theta_rpm300,
600.0, value_theta_rpm600
),
"powerLawExponent", value_exponent
))
Calculate Rheological Parameter from rheometer readings
og.model.general.rheologicalModelCalibration(
newmap(
"rheometerReadings", newmap(
3.0, value_theta_rpm3,
6.0, value_theta_rpm6,
100.0, value_theta_rpm100,
200.0, value_theta_rpm200,
300.0, value_theta_rpm300,
600.0, value_theta_rpm600
),
"fluidType", "FluidType"
))
Fluid Types:
HERSCHEL_BULKLEY
POWER_LAW
BINGHAM
NEWTONIAN
Example

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