Schlumberger

Mnemonics, Software product, DRILLSAFE


CodeDRILLSAFE
NameDrill String Analysis using Finite Element
DisciplineDrilling
TypeAPPLICATION
DescriptionDetermination of BHA tendencies and Drillstring Torque and Drag.

Related channels
ChannelDescription
AXIAL_LOAD Axial component of the applied force at a point of the drill string to maintain the same deformation if one cuts the drill string at this point
AXIAL_STRESS Axial Component of the applied stress vector
AZIMUTH_TURN_RATE Azimuth Turn Rate of the BHA (variation of azimuth angle per unit length)
BENDING_STRESS Stress generated by applying a bending moment (tensile stress on one side of the cross section, compressive stress on the other side
BIT_MD Measured Depth of the Bit
CRITICAL_BUCKLING_LOAD Maximum allowed compressive force. When this value is exceeded, high bending stress will be generated and could exceed the elastic limit
CRITICAL_BUCKLING_STRESS Critical Buckling Stress: critical value of compressive axial stress where the bending stiffness becomes very small. When this value is exceeded, high bending stress will be generated and could exceed the elastic limit
DRAG_LOSS Friction forces generated during trip in / trip out operations
DSF_AVG_ROT_FRIC Average Rotational Friction Factor for the Wellbore
DSF_AVG_SLID_FRIC Average Drag (Sliding operation) Factor for the wellbore
DSF_AVG_TRANS_FRIC Average Translation (Reaming operation) Friction Factor for the Wellbore
DSF_BIT_INCLINATION Inclination at the Bit
DSF_BIT_VERTICAL_DEPTH True Vertical Depth corresponding to the Bit Measured Depth
DSF_COM_STRING_WEIGHT Computed String Weight
DSF_CUTTINGS_DENSITY Density of the Cuttings
DSF_CUTTINGS_DIAMETER Size of the Cuttings
DSF_DCAL Difference between the hole diameter and the maximum Bit OD
DSF_DRVA_OFF_BOT Rotary table motor current, measured while off bottom
DSF_DTOR Downhole Torque on Bit Input for DrillSAFE
DSF_DWOB Downhole Weight on Bit Input for DrillSAFE
DSF_FLOW_RATE Mud Flow Rate In
DSF_FORMATION_STIFFNESS Formation Stiffness
DSF_LITHO_TYPE Description of the Lithology drilled
DSF_LOC_ROT_FRIC Local Rotational Friction Factor for a zone defined by its top and bottom depths
DSF_LOC_SLID_FRIC Local Drag (Sliding operation) Factor for a zone defined by its top and bottom depths
DSF_LOC_TRANS_FRIC Local Translation (Reaming operation) Friction Factor for a zone defined by its top and bottom depths
DSF_MUD_DENSITY Mud Density
DSF_MUD_LUBRICITY_COEFFICIENT Mud Lubricity Coefficient
DSF_MUD_PLASTIC_VISCOSITY Mud Plastic Viscosity
DSF_MUD_TYPE Mud Density
DSF_MUD_YIELD_POINT Mud Yield Point
DSF_PICK_UP_WEIGHT Pick Up Weight measured with drillstring off bottom and moving up
DSF_REL_TF1 Relative Toolface Angle of the Bend 2 versus Bend 1
DSF_REL_TF2 Relative Toolface Angle of the Bend 3 versus Bend 2
DSF_ROP Rate of Penetration Input for DrillSAFE
DSF_RPM Rotational Speed (at the rig floor) Input for DrillSAFE
DSF_SLACK_OFF_WEIGHT Slack Off Weight measured with drillstring off bottom and moving down
DSF_STOR_OFF_BOT Torque Off Bottom measured on the rig floor
DSF_STRING_WEIGHT Actual String Weight measured while Rotating Off-Bottom
GTF Gravity Toolface Angle
HKLD Hook Load
HOOP_STRESS Hoop Stress: azimuth component of the applied stress vector
INCLINATION_BUILD_RATE Inclination Build Rate of the BHA (variation of inclination angle per unit length)
RADIAL_STRESS Radial component of the applied stress vector
SIDE_FORCE Contact Forces applied on a drill string by the wellbore
STOR Surface Torque
TORSION_STRESS Torsional Stress: stress generated by applying torque on a cross section of a drill string component
TQLS Torque loss
VON_MISES_STRESS Von Mises Stress
VON_MISES_TO_YIELD_RATIO Ratio between Computed Von Mises Stress and Yield stress
XSTQ Excess torque

Related parameters
ParameterDescription
BIT_END_DEPTH Ending point in Measured Depth
BIT_INCR_MD Bit Measured Depth increment
BIT_START_DEPTH Starting point in Measured Depth
BLOCK_WEIGHT Block Weight (including the Kelly)


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