Wellbore Genius

Downhole Simulator

Performance modeling

v1.0Solver: OK

Technical coverage hub

Tutorial-grade calculators backfilling perforation erosion (Bell 1995 + Du/Ds/Dd), behind-casing crossflow & limited-entry defeat, horizontal vs vertical initiation criterion, and filtercake / wellbore skin.

Perforation erosion

Gun geometry

Gun OD(in)Wellbore ID(in)Phasing(°)

Slurry

Concentration(kg/m³)v_perf(m/s)v_well(m/s)Duration(min)

Bell (1995) initial diameter

Clearance0.563 in

Baseline diameter0.405 in

Phasing factor0.660

Effective initial D0.267 in

After evolution (eq 8-25)

D_u (upstream)0.304 in

D_s (perpendicular)0.304 in

D_d (downstream)0.312 in

C_d0.891

D_eq (eq 8-24)0.306 in

Behind-casing crossflow

Number of clustersCluster spacing(ft)Connection distance(ft)Barrier transmissibility(md·ft)

Adjacent reachable2

Bypass ratio0.057

Limited-entry effectiveness95.0%

Limited-entry largely preserved.

Horizontal vs vertical initiation

Fluid pressure(psi)Sh (min horizontal)(psi)Sv (overburden)(psi)Tstr (vertical)(psi)Tstrv (horizontal)(psi)

Dipping proppant flow

Dip angle(°)Reduction factor

Vertical threshold7,700 psi

Horizontal threshold9,800 psi

Vertical readyyes

Horizontal readyno

Margin800 psi

Preferred modevertical

Proppant flow multiplier0.875

Filtercake & wellbore skin

Filtercake (eq 9-2)

Distance to matrix centre(ft)Matrix permeability(md)Filtercake thickness(in)Filtercake permeability(md)

Wellbore skin

re (drainage)(ft)rw (wellbore)(ft)Damage skinChoked-frac skin

MD shut-in storage

Storage(bbl/psi)Viscosity(cp)Net pay(ft)

k_eff5.500e-4 md

Reduction vs k_j55.00%

Total skin5.00

Productivity ratio60.1%

τ (shut-in)0.00 h

Half-life0.00 h