Search “oil and gas software free” and most of the results are either free trials of paid platforms or open-source petroleum engineering simulators that nobody in a real independent operation uses daily. If you are hoping to run a production operation on free software, the honest answer is that the serious production, accounting, and allocation categories have no real free option. A few useful free tools exist for specific engineering jobs, and we list them below. But for daily field capture and back-office reporting, there is no free version that a producing company can rely on.

This page separates what actually exists from what people wish existed.

What Free Actually Means in This Category

“Free” in oil and gas software falls into four buckets, and only the first is truly free in any useful way.

  1. Open-source petroleum engineering tools. Free as in no license cost. Useful for reservoir simulation and academic modeling. Not for daily production operations.
  2. Free trials of paid platforms. Usually 14 to 30 days. Useful for evaluation. Not a long-term answer.
  3. Free tiers of paid platforms. Limited well count, limited users. Sometimes useful for micro-operators with fewer than 5 wells.
  4. Free templates and spreadsheets. Free in license cost, expensive in month-end reconciliation and data errors.

If your goal is to run a 30-well operation without paying any software, you are in bucket four, and that is the most expensive software in the world. Paper and Excel cost real money in lost hours and missed barrels.

The Free Tools That Actually Work

These are useful in the right hands.

Petroleum engineering and reservoir simulation

  • OPM (Open Porous Media). Open-source reservoir simulator. Free. Used by academic researchers and a handful of engineering firms. Not a production-ops tool.
  • UTCHEM. Chemical flooding simulator from UT Austin. Free for academic use. Highly specialized.
  • Boast. DOE-released black oil simulator. Free. Dated but still works for certain workflows.
  • CMG Launcher (free academic license). Not open-source, but free academic licenses exist for students and universities.

If you are a reservoir engineer or a grad student, those tools do real work. If you are a producing company trying to replace a paper gauge sheet, none of them apply.

Decline curve analysis and reserves

  • Spreadsheet-based Arps decline templates. Free templates circulate on oilfield forums and LinkedIn. They handle Arps exponential and hyperbolic math correctly if you set them up right. Fine for a small operation that needs a decline plot once a quarter.
  • Python decline-curve libraries. Open-source. Useful if you have someone on the team who can code.

If you need decline plots for ten wells once a quarter, a spreadsheet is fine. Once you are presenting reserves to a lender or doing regular acquisition work, paid tools (OFM, ComboCurve) are the answer.

Regulatory form templates

  • State regulator-published forms. Texas RRC, Oklahoma OCC, New Mexico OCD, Louisiana SONRIS, California CalGEM, and others publish their production report forms free. Free to fill out by hand or in spreadsheet. Not free in time.
  • ONRR federal forms. Published free. Same deal.

If you have fewer than 20 wells and file one state’s production report monthly, the state forms plus a spreadsheet work. Once you are filing across multiple states or tracking 50+ wells, the time cost passes the software cost quickly.

Why the Production Category Has No Real Free Option

Field data capture software has to work when the pumper drives into a canyon in south Texas with no cell signal. It has to sync every gauge, every run ticket, and every downtime code the minute signal returns. If it loses a barrel, the operator loses money. If the app crashes on a Friday night, someone has to answer the phone.

Free software does not come with a phone. It does not come with a guaranteed sync path. It does not come with an SLA when the back office cannot close at month-end because the data did not make it off the lease. For an operation where the wrong number on a single run ticket costs a real amount of money, free is not cheap. Free is risky.

The paid production apps in the independent-operator market (GreaseBook, Scout FDC, FieldCap) price at a few dollars per well per month. For a 30-well shop that is under $200 a month. The math against “free” Excel is not close.

What About Free Trials of Paid Platforms?

Free trials are useful for evaluation, not for running a production operation. Thirty days is long enough to test the field workflow and see whether the pumpers adopt the tool. It is not long enough to close a full month end-to-end through the platform.

If you want a free way to evaluate production software, a free trial is the right path. GreaseBook offers a free trial you can spin up on a single route with one pumper before committing to a rollout. The 200% money-back guarantee on top of the paid contract covers the rest. If the tool is the wrong fit, we refund twice the purchase price and part ways friendly.

Why “Free” Sometimes Means “Costs You More”

Most of the hidden cost of free oil and gas software lives in three places.

  • Pumper time. A pumper on paper spends 30 to 60 extra minutes a day on admin. Across a five-pumper team over a year, that is roughly 750 hours of windshield time and re-keying. Pumper time is not free.
  • Month-end reconciliation. Back-office reconciliation of paper gauge sheets, run tickets, and Excel summaries consumes a week of accountant time at month-end. That is not free either.
  • Missed barrels. The 6% pump-to-net improvement we see on leases that move off paper is not magic. It is the barrels that were being lost to bad gauge reads, forgotten downtime codes, and reconciliation errors on paper workflows.

If you sum those numbers for a 30-well operation, “free” Excel costs more per year than a paid production app by a factor of five or ten.

Who This Page Is Not For

This page is not for reservoir engineers or academic researchers shopping open-source simulators. Those tools are real and useful in that world. It is also not for enterprise shops with compliance-driven platform choices. If you must run a specific enterprise platform for audit or private-equity reasons, “free” is not the relevant conversation.

This page is for independent operators asking whether they can avoid paying for software, and the honest answer is: you can avoid paying for production, allocation, and accounting software, but the hidden cost is higher than the license.

Frequently Asked Questions

What software do oil and gas companies use?

The common stack is a mobile production capture app (GreaseBook, Scout FDC, FieldCap), a production accounting platform (WolfePak, PakAccounting, OGSYS, Bolo), a reserves tool (OFM or ComboCurve), and QuickBooks or an ERP for corporate books. Most independents use three or four of those. Majors and large independents run Quorum, P2 (Enverus), or SAP for enterprise ERP plus the same specialized production and reserves tools.

Is there any free simulation software?

Yes. OPM (Open Porous Media) is an open-source reservoir simulator. UTCHEM covers chemical flooding. Boast is a DOE black-oil simulator. These are reservoir engineering tools, not production operations tools. A producing company running wells daily does not use them.

Will AI take over petroleum engineering?

Not in the next decade in any wholesale way. AI and machine learning are already improving decline forecasting, anomaly detection on production, and some interpretation work. The core engineering judgment (what to do with a poorly performing well, how to design a workover, whether a reserve estimate defends to a lender) still requires an engineer.

What is CMMS in oil and gas?

CMMS stands for computerized maintenance management system. It tracks equipment maintenance, work orders, parts inventory, and inspections. eMaint, Fiix, and UpKeep are common. Most small operators do not run a CMMS because the work-order volume does not justify the software cost. There is no serious free CMMS in oil and gas.

About the author: Greg Archbald is the founder of GreaseBook. He built the product from inside the oil patch and has spent 15+ years on the operator side of oil and gas technology.

Ready for a Real Free Trial?

If you want to try a production app on one route with one pumper before committing to anything, take the 60-second quiz. You get pointed at the right free trial for your operation and a straight answer on what to pay for when the trial ends.

Take the GreaseBook quiz.

Two minutes. No sales call, no pushy follow-up.

If GreaseBook lands and the fit turns out wrong inside year one, the 200% money-back guarantee refunds you twice the contract price. That is how confident we are in the pumper-adoption bar.

P.S. This page is not for operators with zero software budget running fewer than 10 wells, who should use a spreadsheet. No hard feelings. If you are still deciding, the quiz gives you a straight answer in the time it takes to refill your coffee.

**P.S.** Free software in this space is almost always freemium, legacy, or abandoned. None of those three serve an operating business well. Pay for the tool that fits. The cost of the wrong free tool is bigger than the price of the right paid one.