Drilling a well can cost millions, and the people paying for it usually aren't the ones running it. The AFE is how everyone agrees on the number first. Before an operator spends a partner's money, it puts the plan on paper — here's the well, here's what we think it costs, here's your share — and asks each owner to say yes or no.
What's actually on an AFE
An AFE is part cover sheet, part itemized budget. You can expect:
- Well and project details — the well name, location, depth, and what's being done (a new well, a re-completion, a workover).
- Dry-hole costs — the estimated cost to drill and evaluate the well, stopping if it's not worth completing.
- Completion costs — the additional cost to finish and equip the well if it looks productive.
- A line-item breakdown — rig, casing, cement, drilling fluids, fracturing, location and roads, and so on.
- Your share — your working interest percentage applied to the total, i.e. the dollar figure you're being asked to commit to.
The key word is estimate. An AFE is a forecast, not a final bill. Most agreements allow actual costs to run a certain percentage over the AFE before the operator has to come back for a supplemental approval.
Signing it: consent vs. non-consent
When an AFE lands, you have a real decision to make as a working interest owner. Under the joint operating agreement, you elect to participate or not:
- Consent. You sign, agree to pay your proportionate share of the estimated costs, and you share in the well's revenue normally.
- Non-consent. You decline to pay. You don't owe the costs — but you generally give up your revenue from that well until the owners who did pay recover their money plus a penalty (often a few hundred percent of the costs). That mechanism is a carried interest, and the penalty is set in the JOA.
So an AFE isn't just paperwork — it's a capital call with consequences either way. Owners read them carefully, sometimes question the line items, and weigh whether the well looks worth the spend.
From AFE to actual bills
The AFE is the estimate before the work. Once the work happens, the operator sends the real invoices. During drilling and afterward, each owner gets a joint interest billing (JIB) — the monthly statement of actual costs incurred, charged in proportion to working interest. The AFE projects the spend; the JIB collects it. (And the overhead fees an operator charges for running the well — see operated vs. non-operated working interest — show up on those JIBs too.)
On the revenue side, the same well later produces income that's split by everyone's net revenue interest. Costs flow out through JIBs; revenue flows in after royalties. The AFE is simply where that whole cycle begins.
Frequently asked questions
What is an AFE in oil and gas?
A cost estimate the operator prepares before drilling or major work, listing projected costs and sent to each working interest owner to approve their share before money is spent.
Do I have to sign an AFE?
You elect whether to participate. Consent and you pay your share; decline (non-consent) and you typically give up that well's revenue until the participating owners recover their costs plus a penalty.
What's the difference between an AFE and a JIB?
An AFE is the estimate sent before the work asking for approval; a joint interest billing is the actual invoice for real costs sent afterward.
Keep going: start with what a working interest is, read what a JOA is, or see the working interest vs. NRI math.
Educational information only. This article is not legal, tax, or financial advice. For guidance on your specific situation, consult a licensed professional.