Petromium Tools / Formula set TDRAG-001

Torque & Drag

3D quasi-static soft-string planning · pickup / rotating / slack-off kept separate· V2.0

Context

Units

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Animated calculation view

Trajectory, contact, and load profiles

Vertical string configuration

surface · section composition and critical intervals

ControlledTDRAG-001 v1.0.0

1× · arrows pan, +/− zoom, 0 resets, m measures

Figure data

String sections behind the configuration figure
Section	Contact OD (in)	Length (ft)	Top MD (ft)	Bottom MD (ft)
BHA	8	600	0	600
HWDP	5.5	1,200	600	1,800
Drill pipe	5	8,200	1,800	10,000

Axial load profile

Tension positive · compression negative · measured depth downward

ControlledTDRAG-001 v1.0.0

Figure data

Load summary behind the axial envelope
Quantity	Value
Neutral point MD (ft)	4,158.49
Rotating surface torque (ft-lbf)	10,804.07
Maximum normal force (klbf)	12.07

Review · not an approval

Surface load comparison

Pickup indicated hookload

223.1 klbf

Rotating indicated hookload

172.3 klbf

Slack-off indicated hookload

115.3 klbf

Rotating surface torque

10.8 klbf-ft

Indicated hookload adds only the entered traveling-assembly tare. User-entered limits change margins, never the calculated profiles.

All assumptions remain editable

Torque and drag worksheet

Worksheet nameTop referenceAzimuth referenceMaximum element length

Buoyancy basis

Mode

Fluid density

Steel density

Selected buoyancy factor: 0.816826

Boundary loads and tare

Bottom axial force

Entered bit torque

Traveling-assembly tare

Positive axial force is tension; negative is compression. Tare is separate from every downhole force profile.

Minimum-curvature survey

MD increases from the declared top reference. No uncertainty or tortuosity smoothing is inferred.

StationMeasured depth

Inclination

Azimuth

StationMeasured depth

Inclination

Azimuth

StationMeasured depth

Inclination

Azimuth

StationMeasured depth

Inclination

Azimuth

String tally — bit upward

Lengths must sum to bit MD. Effective contact OD remains explicit.

SectionLength

Dry linear mass

Effective contact OD

SectionLength

Dry linear mass

Effective contact OD

SectionLength

Dry linear mass

Effective contact OD

Wellbore intervals — top downward

Cased, open-hole, and riser factors retain separate provenance.

IntervalEnvironmentTop MD

Bottom MD

Hole / casing ID

Axial μRotational μ

IntervalEnvironmentTop MD

Bottom MD

Hole / casing ID

Axial μRotational μ

Optional user-entered limits

Allowable top tensionOptional

Allowable surface torqueOptional

The tool does not derive API ratings or select these limits. Enabled values affect margins only.

Optional measured surface values

Measured pickupOptional

Measured rotatingOptional

Measured slack-offOptional

Measured torqueOptional

Measurement / tare reference

Engineering notesOptional

Calculation complete

Calculation audit

1 warnings

Pickup drag

50.8 klbf

Slack-off drag

56.9 klbf

Max tension

173.1 klbf

Min axial force

-24.1 klbf

Max normal force: 12.1 klbf at 9,467.74 ft MD (slackoff).

Calculation observations

SOFT_STRING_ONLY

Results use a quasi-static soft-string model; stiffness, buckling, dynamics, hydraulics, and marine-riser structural effects are excluded.

SOFT_STRING_COMPRESSION_LIMITATION

Negative axial force is reported as a soft-string compression observation, not a buckling or reach approval.

Operational use warning: verify survey quality, tally, effective contact OD, interval coverage, buoyancy and friction basis, measurement reference, limits, equipment ratings, and approved program. This soft-string worksheet does not authorize rotation, sliding, tripping, backreaming, or overpull.

TDRAG-001 v1.0.0 · Johancsik soft string · minimum curvatureReference example loaded — replace every value with verified well data.