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no edit summary
|+ {{table number|1}}Definitions of terms and abbreviations used in this chapter
|+ {{table number|1}}Definitions of terms and abbreviations used in this chapter
|-
|-
! Term
! Term || Definition || Unit
|-
|-
| P
| P || Hydrostatic pressure at depth d || psi
| Hydrostatic pressure at depth d
| psi
|-
|-
| MW
| MW || Mud weight || lb/gal
| Mud weight
| lb/gal
|-
|-
| D
| D || Vertical depth || ft
| Vertical depth
| ft
|-
|-
| V<sub>bpf</sub>
| V<sub>bpf</sub> || Volume || bbl/ft
| Volume
| bbl/ft
|-
|-
| <sup>D</sup><sub>1</sub>
| <sup>D</sup><sub>1</sub> || Larger diameter || in.
| Larger diameter
| in.
|-
|-
| <sup>D</sup> s
| <sup>D</sup> s || Smaller diameter || in.
| Smaller diameter
| in.
|-
|-
| V<sub>h</sub>
| V<sub>h</sub> || Hole volume; the volume of the open or cased hole || bbl/ft
| Hole volume; the volume of the open or cased hole
| bbl/ft
|-
|-
| V<sub>a</sub>
| V<sub>a</sub> || Annular volume; the volume of the annulus, the area between the outside of the drillpipe or collar and the open or cased hole || bbl/ft
| Annular volume; the volume of the annulus, the area between the outside of the drillpipe or collar and the open or cased hole
| bbl/ft
|-
|-
| V<sub>d</sub>
| V<sub>d</sub> || Displacement volume; the volume displaced by the steel volume of drillpipe or collar. Displacement is the volume between the outside diameter and inside diameter of a drillpipe or collar. || bbl/ft
| Displacement volume; the volume displaced by the steel volume of drillpipe or collar. Displacement is the volume between the outside diameter and inside diameter of a drillpipe or collar.
| bbl/ft
|-
|-
| V<sub>c</sub>
| V<sub>c</sub> || Capacity volume; the volume contained inside a drill pipe or collar || bbl/ft
| Capacity volume; the volume contained inside a drill pipe or collar
| bbl/ft
|-
|-
| W
| W || Weight of collars or casing || lb/ft
| Weight of collars or casing
| lb/ft
|-
|-
| od
| od || Outside diameter of pipe || in.
| Outside diameter of pipe
| in.
|-
|-
| id
| id || Inside diameter of pipe || in.
| Inside diameter of pipe
| in.
|-
|-
| D<sub>t</sub>
| D<sub>t</sub> || Triplex mud pump output || bbl/stroke
| Triplex mud pump output
| bbl/stroke
|-
|-
| D<sub>d</sub>
| D<sub>d</sub> || Duplex mud pump output || bbl/stroke
| Duplex mud pump output
| bbl/stroke
|-
|-
| L<sub>s</sub>
| L<sub>s</sub> || Length of pump stroke || in.
| Length of pump stroke
| in.
|-
|-
| D<sub>1</sub>
| D<sub>1</sub> || Diameter of pump liner || in.
| Diameter of pump liner
| in.
|-
|-
| D<sub>r</sub>
| D<sub>r</sub> || Diameter of pump rod (duplex only) || in.
| Diameter of pump rod (duplex only)
| in.
|-
|-
| AV
| AV || Annular velocity || ft/min
| Annular velocity
| ft/min
|-
|-
| GPM
| GPM || Mud pump output || gal/mi n
| Mud pump output
| gal/mi n
|-
|-
| Dh
| Dh || Hole diameter || in.
| Hole diameter
| in.
|-
|-
| An
| An || Jet nozzle area || in.<sup>2</sup>
| Jet nozzle area
| in.<sup>2</sup>
|-
|-
| J<sub>1</sub> … J<sub>n</sub>
| J<sub>1</sub> … J<sub>n</sub> || Size of jet nozzles, “32nd” omitted || 32nd in.
| Size of jet nozzles, “32nd” omitted
| 32nd in.
|-
|-
| JNV
| JNV || Jet nozzle velocity || ft/sec
| Jet nozzle velocity
| ft/sec
|-
|-
| THhp
| THhp || Total hydraulic horsepower || hp
| Total hydraulic horsepower
| hp
|-
|-
| Pp
| Pp || Mud pump pressure || psi
| Mud pump pressure
| psi
|-
|-
| JNPL
| JNPL || Jet nozzle pressure loss || psi
| Jet nozzle pressure loss
| psi
|-
|-
| % Hhpb
| % Hhpb || Percentage of total horsepower expended at bit || %
| Percentage of total horsepower expended at bit
| %
|-
|-
| BHhp
| BHhp || Hydraulic horsepower at the bit || hp
| Hydraulic horsepower at the bit
| hp
|-
|-
| Hhp/in.<sup>2</sup>
| Hhp/in.<sup>2</sup> || Hydraulic horsepower per square inch area of bit || hp/in.<sup>2</sup>
| Hydraulic horsepower per square inch area of bit
| hp/in.<sup>2</sup>
|-
|-
| Ob
| Ob || Bit diameter || in.
| Bit diameter
| in.
|-
|-
| JIF
| JIF || Jet impact force || lb
| Jet impact force
| lb
|-
|-
| FFP
| FFP || Formation fracture pressure || psi
| Formation fracture pressure
| psi
|-
|-
| T% Hhpb
| T% Hhpb || Total percentage hydraulic horsepower at the bit || %
| Total percentage hydraulic horsepower at the bit
| %
|}
|}