Quick Summary: An Authorization for Expenditure (AFE) is the budget document that controls every dollar spent on an oilfield project. As a subcontractor, you rarely see it directly, but it dictates whether your invoices get approved, whether change orders move forward, and whether the project continues at all. Understanding how AFEs work gives you a real advantage in billing, scope negotiation, and cash flow planning.
If you have ever submitted a change order and watched it disappear into a black hole, or pushed back on an operator’s pricing objection and hit a wall, there is a good chance an AFE was involved. The AFE authorization for expenditure oilfield process sits at the center of how operators manage project spending, and it shapes almost every financial decision you interact with, even when no one tells you it exists.
This guide explains what an AFE is, how it affects your ability to bill, and what you can do practically to protect your cash flow when a project goes over budget.
What Is an AFE in Oil and Gas?
An AFE, or Authorization for Expenditure, is a formal cost estimate and approval document that an operator prepares before beginning a project. A well drilling program, a pipeline installation, a facility upgrade: all of these require an AFE before a single dollar gets committed.
The document itemizes every expected cost on the project, organized into categories. It then goes to the operator’s working interest partners for review and approval. Once partners sign off, the AFE becomes the financial ceiling for the project. Spending beyond that ceiling requires additional approval, and that process has real consequences for everyone on the project, including you.
Think of the AFE as the project budget your invoices are measured against, even though you never hold a copy of it.
Why operators use AFEs:
- To get financial commitment from joint venture partners before work begins
- To control cost exposure across multiple stakeholders
- To create accountability for every line item of spending
- To satisfy internal governance and audit requirements
In the Permian Basin, a standard horizontal well AFE might run $6 million to $10 million. A Gulf Coast deepwater well can exceed $100 million. Your share of that budget as a service subcontractor might be anywhere from $50,000 to several million dollars, depending on your trade and scope.
Why Subcontractors Need to Understand AFEs (Even Without Seeing One)
Here is the core reality: your Master Service Agreement (MSA) establishes your rates, but the AFE determines whether there is budget to pay them.
When an operator’s project manager tells you your day rate is too high, they are often not negotiating for sport. They are working within a specific AFE line item that was fixed weeks or months before you showed up. When a change order takes three weeks to approve instead of three days, it is frequently because the project is trending toward the AFE ceiling and someone upstream needs to authorize additional spend.
Understanding this dynamic changes how you operate:
- You stop taking budget pushback personally and start treating it as a constraint to solve
- You recognize when slow change order approvals signal a deeper budget problem
- You know when to escalate and when to hold
- You make smarter decisions about when to submit invoices and how to sequence work
The AFE is also why field ticket accuracy matters far more than most subcontractors realize. Every cost code on your field ticket maps to a line item in the operator’s AFE tracking system. Tickets with missing codes, wrong categories, or incomplete data create reconciliation problems that slow your payment down.
What Goes Into an AFE Budget
AFEs are typically structured around two major cost categories: tangible costs and intangible costs.
| Cost Category | What It Includes | Subcontractor Relevance |
|---|---|---|
| Tangible costs | Casing, tubing, wellhead equipment, surface facilities, pumps | Equipment suppliers, fabricators, materials vendors |
| Intangible costs | Drilling services, cementing, logging, completions, labor, fracking | Most service subcontractors fall here |
| Operator overhead | Administrative, supervision, project management | Typically 3-8% of total AFE value |
| Contingency | Buffer for unknowns and scope changes | Usually 5-15% of total; this is what saves you when overruns happen |
Your services as a subcontractor almost always fall into the intangible cost category. This matters because tangible and intangible costs are tracked separately and often have different approval thresholds.
The contingency line is worth understanding closely. A 10% contingency on a $7 million Permian well gives the operator $700,000 in buffer before they need to go back to partners for more money. If you submit a legitimate change order for $50,000, and the project is still within contingency, approval is usually straightforward. If that contingency is already burned, your change order becomes a negotiation about priorities.
How AFE Budgets Affect Your Billing
Operators track actual costs against AFE line items continuously, often in real time using job costing software such as Aimsio. The project manager reviewing your invoice is not just looking at whether the work was done. They are asking whether approving your invoice keeps their project inside the AFE.
A few practical patterns you will see in the field:
The 110% rule. Most operators have internal policies that require additional partner or executive approval once total project costs reach 110% of the approved AFE. Once that threshold is approaching, change order approvals slow dramatically. Expect pushback even on legitimate, well-documented scope additions.
Line item exhaustion. Even if the overall AFE has budget remaining, a specific line item can be exhausted. If your service category is at or over its budgeted amount, you may face delays even when the project overall is healthy. This is why you need to understand which line item your work falls under.
Cash call timing. Operators fund AFE spending by issuing cash calls to working interest partners. If a partner is slow to fund or disputes the call, the operator may delay payments downstream. This is one of the less obvious ways that AFE mechanics affect your DSO (Days Sales Outstanding).
What you can do: Ask your operator contact, directly and professionally, how the project is tracking against budget. Most project managers will tell you. That information is genuinely useful for deciding when to push on a change order and when to be patient.
What Happens to Subcontractor Payments When a Project Goes Over AFE Budget
When a project exceeds its AFE budget, the operator cannot simply keep spending. They must seek additional authorization through either a supplemental AFE or a formal AFE revision. This involves re-presenting revised cost estimates to working interest partners and getting new sign-offs.
Depending on the number of partners involved and the required approval thresholds, this process can take anywhere from a few days to several weeks. During that window, your pending change orders and additional scope invoices typically sit in limbo.
The scenarios you need to prepare for:
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Supplemental AFE gets approved. Work continues, invoices clear, life goes on. This is the most common outcome.
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Project gets descoped. The operator cuts lower-priority work to stay within the revised budget. If your scope is on the chopping block, you may have completed work that becomes disputed.
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Project gets suspended or cancelled. Rare, but it happens. This is the scenario where unpaid work in progress becomes a serious collection problem.
How to protect yourself:
- Track your own costs and progress against your original work order scope, not just the AFE you cannot see. Your LEM (Labour, Equipment, Materials) records are your evidence if a dispute develops.
- Submit change orders the moment scope expands, not at the end of the project. Waiting consolidates your billing risk and makes it easier for an operator to dispute the work when the AFE is already stressed.
- Never rely on verbal approvals for additional scope. Get written confirmation, even a text or email, before committing resources.
- Review your MSA for provisions on payment obligations when a project is suspended. Some MSAs include standby day rate provisions that protect you during delays.
- Use your price book consistently so your billing never surprises anyone on the operator side.
AFE vs. Lump-Sum Contracts: How Your Risk Profile Changes
Understanding the difference between working under an AFE-driven contract and a lump-sum contract changes how you should price and manage your work.
Under an AFE-driven (cost-reimbursable) contract:
- You bill for actual time and materials, typically at a unit rate or day rate schedule
- Your exposure to AFE overruns is real: change orders compete for remaining budget
- Accurate field documentation is critical because every line item is reviewed against the AFE
- You share the budget risk with the operator to some degree
Under a lump-sum contract:
- Your price is fixed regardless of AFE status
- In theory, AFE overruns are the operator’s problem, not yours
- In practice, an operator under budget pressure will still push back on scope interpretations
- Your risk is scope creep: work that was not in your lump-sum price but that you did anyway
Neither structure eliminates AFE-related risk. The practical difference is where that risk sits. Cost-reimbursable work gives you flexibility to bill for actual costs but exposes you to approval delays when the AFE is stressed. Lump-sum work gives you billing certainty but requires you to define and defend your scope aggressively.
The takeaway: regardless of contract type, you need to document your work with the same precision. Revenue leakage happens in both models when documentation fails.
How to Request an AFE Amendment as a Subcontractor
You cannot request an AFE amendment directly. You do not have standing in that process because you are not a working interest partner. But you can influence it.
When you have legitimate additional scope that requires more budget than the AFE allows, the path forward looks like this:
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Document the scope change precisely. Quantity, reason, cost impact, timing. Your field tickets and LEM records are the foundation here.
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Submit a formal change order to your direct operator contact. Make the financial impact explicit. Do not bury the number.
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Give the operator the business case. If the additional work protects a capital asset, prevents a worse cost, or is genuinely required to complete the original scope, say so clearly. Operators use exactly this kind of justification when presenting a supplemental AFE to partners.
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Set a response deadline. A change order that sits without a response is not a pending approval. It is a problem waiting to get worse. Give the operator a reasonable but firm timeline, consistent with your MSA payment terms.
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Escalate if necessary. If your direct contact cannot approve the additional budget, ask them to identify who can. Sometimes the right move is a conversation at the project manager or VP level, not the field level.
The operators who go to bat for a supplemental AFE do so because their subcontractors gave them something to work with. Your documentation is their ammunition.
Practical AFE Checklist for Subcontractors
Before and during any AFE-driven project, use this checklist to protect your billing and cash flow:
- Confirm which AFE line item your work falls under before the project starts
- Verify your cost codes match the operator’s tracking categories
- Submit an accurate baseline scope estimate so your line item is funded correctly from day one
- Set up a simple internal tracking system to compare your actual costs against your work order value
- Submit field tickets daily or weekly, not at the end of the project
- Submit change orders immediately when scope expands, with full documentation
- Ask your operator contact periodically how the project is tracking against AFE budget
- Review your MSA for payment terms that apply if the project is suspended or descoped
- Never perform out-of-scope work based on a verbal request alone
- Keep LEM records for every day on-site, even when nothing unusual happens
Bottom Line
The AFE is the financial backbone of every oilfield project, and it shapes your billing environment whether you know it or not. Subcontractors who understand how AFEs work submit cleaner invoices, win change order battles more often, and get paid faster. Your job is not to manage the AFE. Your job is to document your work so precisely that your invoices are impossible to dispute, and to recognize the signals that tell you when budget pressure is about to slow your cash flow down.
