Oilfield Maintenance Log: Template, Fields and Checklist
What is an oilfield maintenance log?
An oilfield maintenance log is the dated record of every inspection, repair, replacement and workover done on a well, tank or piece of lease equipment, written by whoever did the work and tied to that specific asset. A good log answers four questions later: what was done, on which asset, by whom, and what it cost.
How to keep an oilfield maintenance log in six steps:
- Pick from one asset list. Every entry names a well or tank from your master list, never a free-text lease name.
- Use a fixed work type: inspection, repair, replacement, workover, test, cleaning.
- Write the finding and the action in specific words, not "fixed pump."
- List parts and labor with quantity and unit cost.
- Attach photos of the failure, the tag, or the finished work.
- Tie the entry to the invoice when it arrives, then book the cost to the same well.
What fields does every maintenance log entry need?
| Field | Why it matters later |
|---|---|
| Asset (well or tank ID) | Puts the cost on the right well and the history in one place |
| Date performed | Puts the cost in the right month on the lease operating statement |
| Work type (fixed list) | Lets you count repairs by type and spot repeats |
| Performed by (vendor or pumper) | Who to ask, and whose invoice to expect |
| Finding | What was wrong, in specific words |
| Action taken | What was done to fix it |
| Parts and materials | Part, quantity, unit cost; checks the invoice |
| Labor and equipment | Crew hours, rig or truck hours |
| Photos and files | Evidence for a partner, vendor, or insurer |
| Next due date (if recurring) | For inspections and tests on a schedule |
| Revision history | What changed after submission, and who changed it |
A small operator can start with the first eight. Add photos and revision history as soon as more than one vendor works on your wells, because more people touch the same record and nobody can call the person who was there.
Free oilfield maintenance log template
Copy this into a spreadsheet or your field ticket tool. One row per job.
| Date | Well or tank | Work type | Performed by | Finding | Action taken | Parts (qty x unit cost) | Labor and equipment (hrs x rate) | Photos | Invoice no. | Reviewed by |
|---|---|---|---|---|---|---|---|---|---|---|
| 2026-10-14 | Example Lease A #2 | Repair | ABC Well Service | Pump stuck, no fluid at surface | Pulled rods, replaced insert pump, replaced 4 rods | Pump repair 1 x $1,180; rods 4 x $62 | Pulling unit 6 x $245; trucking 1 x $310 | 3 |
Use the same columns for every vendor. An equipment maintenance log for compressors, separators or tanks uses the same template; only the asset changes.
Worked example: from log entry to well cost
The entry above is a hypothetical rod pump repair. Here is how it becomes a cost a partner can check.
1. Total what the log says.
- Pulling unit: 6 hrs x $245 = $1,470
- Insert pump repair: 1 x $1,180 = $1,180
- Rods: 4 x $62 = $248
- Trucking: $310
- Logged total: $3,208
2. Compare the invoice. The vendor invoice arrives at $3,453. The difference is $245, exactly one pulling unit hour: the invoice bills 7 hours, the log says 6. Because the log was written on location with photos, the office has something specific to ask about before approving.
3. Book the approved cost to the well. Once the hours are settled (say the log is right), book $3,208 to Example Lease A #2 as repairs and maintenance, with the invoice number and the log entry attached. It flows into that month's lease operating statement under a fixed LOE category.
4. Show each partner's share. A partner with 25% working interest carries $3,208 x 0.25 = $802.00 of the repair.
Use the log to spot repeat failures
A log with dates and work types tells you when a well keeps breaking. Suppose the same well logged pump repairs on 2026-02-11, 2026-06-02 and 2026-09-14.
- Feb 11 to Jun 2: 111 days
- Jun 2 to Sep 14: 104 days
- Average run time between pump failures: (111 + 104) / 2 = 107.5 days
If each repair costs about $3,200, that well is spending roughly $3,200 every 3.5 months on the same failure. That is the point to ask whether a larger job is worth it; see workover cost and payback math for how to run that decision, and equipment downtime tracking for counting the lost production days too.
Paper, spreadsheet, or software?
| Paper log | Spreadsheet | Field ticket or maintenance software | |
|---|---|---|---|
| Cost to start | None | None | Subscription |
| Written when | On location, if someone remembers | Later, at a desk | On location, from a phone |
| Photos | Separate, often lost | Separate files | Attached to the entry |
| Ties to the well cost | Manual | Manual | Depends on the product |
| Search by well and date | Hard | Possible | Built in |
| History of edits | None | Weak | Depends on the product |
Software is worth it once vendors, pumpers and office staff all touch the same wells. For what to require and how to test vendors, see the field ticket software buyer's guide. Ask every vendor directly what happens with no cell signal and test it in the demo.
Common maintenance log mistakes
- Free-text asset names. "The unit on Lease 12" cannot be reported on. Use a well master list.
- Vague findings. "Fixed leak" says nothing. Write where, what failed, and what was replaced.
- No parts or hours. Then the invoice cannot be checked against the log.
- No photos on failures. A photo settles severity and vendor questions months later.
- Entries written at the end of the week. Dates and quantities drift. Write it on the truck.
- Edits that overwrite. Keep the earlier version and who changed it.
Oilfield maintenance log checklist
- Every entry picks a well or tank from one master list
- Work type comes from a fixed list
- Date performed recorded, not date entered
- Finding and action written in specific terms
- Parts with quantity and unit cost
- Labor and equipment hours with rates
- At least one photo on any failure or repair
- Invoice compared to the log before approval
- Approved cost booked to the same well with the log attached
- Repeat failures reviewed monthly by well
Where WellsManager fits
WellsManager's Field Log is a mobile portal for vendors and pumpers. They sign in from the phone's browser (no app to install), pick the well or tank, choose a maintenance type from a fixed list, describe the inspection, repair or workover, add parts as material lines, and attach photos. The record lands where office staff review it. Vendors can revise their own submissions, and revisions are kept rather than overwritten.
When the invoice arrives, you book it as a well cost with the vendor, invoice number and date, and link it to the maintenance record, so "what did that workover cost?" is one well page. A workover cost report pulls those jobs together. Notification rules for a field or well can send scheduled reminders by email or in the app, and field staff can log maintenance through Claude with a confirmation before anything is written.
Field Log is not a production gauging app or a refinery CMMS: no gauge sheets, no SCADA tags, no preventive-maintenance engineering. See how wells and tanks are set up in asset management or get a price for your operation.
Frequently asked questions
What is an oilfield maintenance log?
A dated record of each inspection, repair, replacement or workover on a well, tank or lease equipment, tied to that asset, with who did the work, what was found, what was done, and parts and labor used.
What should be included in a maintenance log?
Asset, date performed, work type, who performed it, finding, action taken, parts with quantity and unit cost, labor and equipment hours, photos, and a history of later edits.
Is there a free maintenance log template?
Yes. The template in this article has one row per job with columns for date, well or tank, work type, vendor, finding, action, parts, labor, photos, invoice number and reviewer.
What is the difference between an equipment maintenance log and a well maintenance log?
The fields are the same. An equipment log tracks a compressor, separator or tank; a well log tracks work on the well itself. Use one template and one asset list for both.
How does a maintenance log help with invoices?
It records hours, parts and quantities on location, so the office can compare the vendor invoice to what was logged before approving it and booking it to the well.
How do you find wells with repeat failures?
Filter the log by well and work type, then measure the days between failures. Short and shrinking intervals point to a well that may justify a larger repair or workover.
Should oilfield maintenance logs be paper or digital?
Paper works for one or two wells. Once several vendors and office staff share the work, a digital log with photos, one asset list and edit history is easier to search and tie to costs.