Schlumberger

Mnemonics, Software product, DRILL_HYDRAULICS


CodeDRILL_HYDRAULICS
NameDrilling Hydraulics Analysis
DisciplineDrilling
TypeAPPLICATION
DescriptionPowerPlan component for drilling hydraulics computation for the wellbore annulus

Related channels
ChannelDescription
ANNULUS_PRESSURE_DROP Computed annulus pressure drop (WITS channel PLA)
BEARING_BOX_FLOWRATE Computed PDM bearing box flowrate
BIT_FLOWRATE Computed bit flowrate
BIT_HYDRAULIC_POWER_RATIO Ratio of bit pressure loss to total system pressure loss
BIT_PRESSURE_DROP Computed bit pressure drop (WITS channel PLB)
BOTTOMS_UP_STROKE_COUNT Bottoms up - number of strokes
BOTTOMS_UP_TIME Bottoms up time
BROP Bit Rate Of Penetration
CHKP Choke Position
CHOKE_LINE_PRESSURE_DROP Computed choke line pressure drop
CHOKE_PRESSURE_DROP Computed choke pressure drop
CRITICAL_TRANSPORT_RATE Minimum flowrate necessary to carry cuttings
DRILLPIPE_PRESSURE_DROP Computed drill pipe pressure drop (WITS channel PLDS)
ECD_ADDITIONAL Computed equivalent circulating density at the additional depth
ECD_BIT Computed equivalent circulating density at the bit (WITS channel ECDBIT)
ECD_SHOE Computed equivalent circulating density at the casing shoe (WITS channel ECDCSG)
FULL_CIRC_ANNULUS_STROKE_COUNT Number of strokes for one full circulation through the annulus
FULL_CIRC_ANNULUS_TIME Time for one full circulation through the annulus
FULL_CIRC_CHOKE_STROKE_COUNT Number of strokes for one full circulation through the choke line
FULL_CIRC_CHOKE_TIME Time for one full circulation through the choke line
JET_VELOCITY Computed fluid velocity through nozzles (WITS channel JV)
LWD_PRESSURE_DROP Computed LWD pressure drop
MAX_BHPA Computed maximum bit horsepower per area
MAX_JET_FORCE Computed maximum jet impact force (WITS channel JIF)
MAX_PDM_FLOWRATE Maximum motor flowrate
MECHANICAL_HP Computed mechanical horse power
MIN_PDM_FLOWRATE Minimum motor flowrate
MWD_PRESSURE_DROP Computed MWD pressure drop (WITS channel PLMW)
OFF_BOTTOM_PRESSURE_DROP Computed off bottom PDM pressure drop
ON_BOTTOM_PRESSURE_DROP Computed On bottom PDM pressure drop
ON_BOTTOM_RPM Computed on bottom motor RPM
ON_OFF_BOTTOM_PRESSURE_DROP On/off bottom pressure drop difference across PDM
OPTIMUM_HP Computed optimum horse power
PDM_EFFICIENCY Computed motor efficiency
PDM_PRESSURE_DROP Computed motor pressure drop (WITS channel PLMM)
ROTOR_NOZZLE_FLOWRATE Computed PDM rotor nozzle flowrate
RPM Rotational Speed
SHOE_TO_SURFACE_STROKE_COUNT Number of strokes to circulate from casing shoe to surface
SHOE_TO_SURFACE_TIME Time to circulate from casing shoe to surface
SPPA Standpipe Pressure
SUBSEA_BOP_TO_SURFACE_ANNULUS_STROKE_COUNT Number of strokes from subsea BOP to surface through choke line
SUBSEA_BOP_TO_SURFACE_ANNULUS_TIME Time to circulate from subsea BOP to surface through the annulus
SURFACE_PRESSURE_DROP Computed surface equipment pressure drop (WITS channel PLSU)
SURFACE_TO_BIT_STROKE_COUNT Number of strokes to circulate from surface to bit
SURFACE_TO_BIT_TIME Time to circulate from surface to bit
SURFACE_TO_BOP_STROKE_COUNT Number of strokes to circulate from the surface to the subsea BOP
SURFACE_TO_BOP_TIME Time to circulate from the surface to the subsea BOP
TOOL_JOINT_PRESSURE_DROP Computed Total Tool Joint pressure drop
USER_LWD_PRESSURE_DROP User-supplied LWD pressure drop for non-SLB tools
USER_MWD_PRESSURE_DROP User-supplied MWD pressure drop for non-SLB tools

Related parameters
ParameterDescription
BACK_PRESSURE_DROP Constant pressure drop on a flowline used mainly to approximate any kind of restriction, choke, nozzle ...
BIT_MD Measured depth of the bit at the time of calculation
BIT_NOZZLE_COUNT Drill bit nozzle count of the specified drill bit nozzle size
BIT_NOZZLE_SIZE Drill bit nozzle size (1/32")
BIT_NOZZLE_TFA Total flow area of drill bit nozzle or jet
BOOST_LINE_PUMP_FLOWRATE Riser Boost line pump flowrate
CHOKE_LINE_ID Choke line internal diameter
CHOKE_LINE_LENGTH Choke line length
CONSISTENCY_INDEX The k parameter in the Power-Law and Herschel-Bulkley rheological models. The Power_Law model is "Shear_Stress=k times (Shear_Rate at the power of n)". The unit of k is traditionally lbf.sec^n/ft^2 or Pa.s^n.
CRITICAL_TRANSPORT_DEPTH Depth at which critical transport rate for hole cleaning occurs
CUTTINGS_DENSITY Cuttings density
CUTTINGS_DIAMETER Cuttings diameter
DOWNHOLE_TORQUE The torque on the drillstring measured downhole
DOWNHOLE_WOB The weight on bit measured downhole
ECD_ADDITIONAL_DEPTH Additional depth of interest for Equivalent Circulating Density calculations
FANN_100_SHEAR_STRESS Fann viscometer shear stress at 100 rpm
FANN_200_SHEAR_STRESS Fann viscometer shear stress at 200 rpm
FANN_3_SHEAR_STRESS Fann viscometer shear stress at 3 rpm
FANN_300_SHEAR_STRESS Fann viscometer shear stress at 300 rpm
FANN_6_SHEAR_STRESS Fann viscometer shear stress at 6 rpm
FANN_600_SHEAR_STRESS Fann viscometer shear stress at 600 rpm
FLOW_BEHAVIOR_INDEX The n parameter in the Power-Law and Herschel-Bulkley rheological models. The Power_Law model is "Shear_Stress=k times (Shear_Rate at the power of n)". n is dimensionless.
HWMU Mud Density
MAX_INPUT_HP Maximum input horse power
MAX_PUMP_PRESSURE Maximum pump pressure
MOTOR_WEAR Measure of Mud Motor age (0% is a new motor)
MUD_FLOWRATE The rate at which mud, or drilling fluid, is being pumped into, or output from, a borehole or some storage unit.
NEWTONIAN_VISCOSITY Slope of Shear Stress/Shear Rate curve for the Newtonian rheology model (Shear Stress proportional to Shear Rate)
PLASTIC_VISCOSITY Apparent viscosity of the Bingham Plastic model : Slope of the curve shear stress vs. shear rate (rheogram). Model equation is Shear_Stress= Yield_Stress + Plastic_Viscosity times Shear_Rate.
PUMP_EFFICIENCY Overall pump efficiency
RADIAL_BEARING_CLEARANCE PDM radial bearing clearance
RHEOLOGY_MODEL Mathematical model describing how the shear stress relates to the shear rate i.e. how a fluid flows and is deformed in response to applied stresses. Most popular model are Newtonian, Bingham Plastic and Power-Law
ROTOR_NOZZLE_DIAMETER Motor rotor nozzle diameter
STALL_FLAG Flag for calculation of motor stall parameters
STROKE_VOLUME Volume of a pump stroke
SUBSEA_BOP_FLAG Flag for whether subsea BOP is present
SURFACE_LINES_VOLUME Total volume of the surface lines equipment
YIELD_STRESS Shear stress at 0 shear rate for Bingham Plastic (BP) rheological model, otherwise named Bingham yield value or yield point. BP fluid remains static until applied forces build up to the point where it starts to move. See Plastic_Viscosity.


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