Petromium
Petromium

Petromium Tools / Formula set SURGE-SWAB-001

Surge & Swab

Steady-state tripping pressure screening · open and closed-end strings · V2.0

Context
Units
Stored only in this browser · tap any field unit for quick conversion

Moving-string pressure path

Run in hole · surge · surface

Open-hole pressure context

Running in hole · surge · surface

01,0002,0003,0004,0005,0006,0007,0008,0009,000TVD (ft)SURFACETD 9,000 ftSHOE 3,500 ftString running in holeAnnular fluid displacementBIT 9,000 ftON BOTTOMACTIVE OPEN-HOLE ZONECASEDSANDSHALESTATIC MW12 ppgEFFECTIVE AT BIT12.29 ppg

Trip-speed sensitivity

Effective density versus pipe speed · unsafe regions retained

06012018024030015.814.713.612.511.410.3Trip speed (ft/min)Equivalent density (ppg)PP 10.5 ppgFG 15.5 ppgSAFE RIH NOT FOUND · SAFE POH 238 ft/minSurgeSwab

Entered speed

90 ft/min

Pressure magnitude

133.6 psi

Surge density

12.286 ppg

Swab density

11.714 ppg

Calculated boundary

Not reached

Review · not an approval

Pressure-window snapshot

Bottom surge density

12.286 ppg

Fracture-boundary speed

Not reached

Pore-boundary speed

238 ft/min

Search ceiling

300 ft/min

The calculated boundary is not an approved trip speed. The worksheet does not choose a direction, speed, end condition, empirical factor, or pressure limit.

Direction review

Displayed direction

Both directions are always calculated and retained in the audit. This selector changes presentation only.

Explicit user assumptions

Steady-state trip model

End condition and rheology

String end
Model
Annulus
Declared model boundary: the `0.45` clinging and `1.5` peak factors are editable field-method assumptions. This release is steady-state and excludes acceleration, gel breaking, compressibility, temperature/pressure rheology, cuttings, local restrictions, losses, influx, free-surface motion, and dynamic pressure waves.

Surface-to-bottom intervals

Order rows from surface to bottom. Limits are optional and are never invented by the worksheet.

01

Interval result

7.6 psi · Re 1,271

Surge / swab 12.049 / 11.951 ppg

02

Interval result

67 psi · Re 1,386

Surge / swab 12.169 / 11.831 ppg

03

Interval result

59.1 psi · Re 2,590

Surge / swab 12.286 / 11.714 ppg

Calculation complete

Calculation audit

1 warnings

Pressure magnitude

134 psi

Governing boundary

238 ft/min

Surge density

12.286 ppg

Swab density

11.714 ppg

Calculation observations

TRANSITION_INTERPOLATION

BHA in open hole: transitional flow is represented by interpolation between the published regime boundaries.

FRACTURE_BOUNDARY_NOT_REACHED

No entered fracture boundary is reached within the declared speed-search range.

EMPIRICAL_EQUIVALENT_VELOCITY

Equivalent annular velocity uses the entered clinging factor 0.45 and peak-velocity factor 1.5; neither factor is selected or calibrated by the worksheet.

STEADY_STATE_SINGLE_PHASE_MODEL

Steady-state single-phase screening only. Acceleration, gels, compressibility, temperature/pressure rheology, cuttings, losses, influx, free-surface movement, and dynamic pressure waves are excluded.

Operational use warning: verify tally, survey TVD, end condition, float status, restrictions, representative rheology, fill-up practice, trip-tank response, and approved pore/fracture limits. The calculated boundary does not authorize a trip speed.
SURGE-SWAB-001 v1.0.0 · SPE steady-state equation family · API RP 13D landscapeReference example loaded - replace every value with verified job data.