Nodal analysis
Match inflow performance against tubing performance to find the operating point, and see how it moves as reservoir pressure declines.
Well performance simulation
Know how your well
will produce.
WellsSim models the full production system — reservoir inflow, wellbore hydraulics, and surface constraints — so you can size equipment, plan interventions, and forecast rates before committing capital.
Run it in the browser at wellssim.app, or take the portable build — 34.7 MB, no installation and no network required.
Capabilities
Multiphase flow
Pressure traverse calculations for oil, gas, and water through tubing and flowlines, with selectable correlations for your fluid system.
Artificial lift design
Evaluate gas lift, ESP, and rod pump scenarios side by side to see which sustains production economically as the well ages.
Sensitivity analysis
Sweep tubing size, wellhead pressure, water cut, or skin, and quantify what each one actually costs you in rate.
Reserve estimation
Material balance solvers for oil and gas — Tarner and Walsh recovery prediction, and gas p/Z to back GIIP out of production history.
Production forecasting
Project rates and cumulative recovery over time to support reserves work and development planning.
Reporting
Export results, curves, and case comparisons in a form you can hand straight to a partner or an approval committee.
Download
WellSim 2.8 portable
Unpacks to a single WellSim-2.8\ folder holding the program, the
signing certificate and the manual. Unzip it anywhere — a USB stick is fine;
nothing is installed and nothing is written outside the folder. Double-click
WellSim.exe: a console window opens and the app appears at
localhost:3355 in your browser. Closing that console window
stops WellSim. Cases are saved as ordinary JSON in a cases\
folder beside the exe, so keep it somewhere writable — not in
Program Files.
SHA256
7C1C0E80D4F898E1278F3E6831158B566F6130172B8F782E8D97A8DCB89EB2F5
Verify with Get-FileHash .\WellSim-2.8-distribution.zip -Algorithm SHA256.
Signed CN=M. El-Ashry, timestamped, thumbprint
78974137A5BE991462A896EBF7FB25F17DC6FDC6.
What changed in 2.8
The PostgreSQL boundary is gone — the server now has no runtime dependencies
at all. The export contract was reimplemented from a written specification,
with its formula-injection defence explicitly tested: a cell beginning
=, +, - or @ is neutralised
so a spreadsheet cannot execute it on open, while a negative number stays a
number rather than being mangled into text.
Nine MARCH defaults that were never the analyst's to set are now fixed rather than editable, and lift-gas SG appears only when the water well is actually gas lifted. The manual and the interface differ from 2.7; the physics does not — every verified answer matches.
Windows will show two warnings — here is why
The certificate is self-signed rather than issued by a commercial authority.
Until you install the included .cer, Windows reports that the
signature “terminated in a root certificate which is not trusted”.
That is the trust store talking, not a problem with the file — and the SHA256
above does not depend on it.
SmartScreen warns either way, for the same reason. To have Windows report the
signature as fully trusted: double-click the .cer → Install
Certificate → Local Machine → Place all certificates in the following
store → Trusted Root Certification Authorities.
Would rather not download anything? Run WellSim in your browser at wellssim.app
About
WellsSim is built for production and reservoir engineers who need dependable answers about well behaviour without wrestling the software to get them.
The aim is a tool that is quick enough for a screening study in the morning and rigorous enough for the case you defend in the afternoon.
Request a demo
Tell us about your wells and we will show you how WellsSim handles them.
Get in touch