Mud motor maintenance history: what to record between runs

An equipment number can tell a coordinator which motor is being discussed. It cannot, by itself, explain what happened on the previous job, which configuration returned or whether the work identified at inspection has been completed. Those answers depend on the history attached to the unit.

For a drilling motor that moves repeatedly between the yard, wellsite and workshop, the useful record is a sequence of identifiable events. It should allow the next person to connect the motor in front of them with its configuration, operating record, reported condition and workshop evidence.

Hafrix editorial · Initial edition: 5 November 2026. This is an operational recordkeeping guide, not a motor servicing procedure. Follow the applicable OEM instructions and approved inspection and release requirements. All examples are illustrative.

Start with the identity of the unit

Choose a stable internal equipment ID and keep the manufacturer's serial number in a separate field. The internal ID helps the business follow the same asset through its operational history; the serial number connects the record to the physical identification and supporting documents.

Record the manufacturer, model or family and the configuration information your operation uses to distinguish compatible units. A short free-text description can help someone find a record, but it should not be the only place where a configuration change is documented.

When components are exchanged, establish what the asset identity represents. Does it follow a complete assembly, a principal component or another controlled boundary? Decide this before importing old records. Otherwise a series of component swaps can look like an unchanged motor even when the equipment history needs a more precise explanation.

Give every run a reference

Use a job reference and a run reference rather than relying on a date and the well name alone. A unit may have several recorded runs during one job, and a description entered weeks later may not identify which event a field observation concerns.

The operating record should state the period, the units and the source of each quantity. Pumping hours, another recorded operating-hours measure and a commercial rental day are different quantities. A number called simply "hours" is difficult to interpret later.

Keep missing information visible. If a field record has not arrived, mark its status and owner rather than using zero. Zero suggests a known quantity; an outstanding run report means the quantity is not yet established. Corrections should retain the previous value and explain the source of the replacement.

For each run, capture the job and well or site identifiers, the supplied configuration, the dates, the agreed usage measures and the supporting report. Link return observations to the same run reference. This lets a workshop reviewer read the reported event in context without trying to match filenames by memory.

Separate observations, findings and decisions

The person returning a motor may report an unusual operating condition. That observation is valuable, but it is not an inspection result or a diagnosis. Store the original report with its author, date and source, and keep the subsequent workshop findings distinct.

The maintenance history should show which inspection or work order addressed the observation, what was found, what work was authorized and what was completed. If a component was replaced, record the reference required by your controlled component process. Attach the resulting evidence to the work it supports.

The close-out needs its own date and responsible person. "Repair complete" and "released for the next assignment" can represent different decisions. A finished workshop task may still be waiting for review, documents or another requirement applicable to the next job.

A small history that can answer a real question

Consider illustrative unit MM-204. A coordinator needs to know whether a concern from its last assignment has been addressed.

This sequence does not prove that a particular motor is fit for service. It shows where an authorized reviewer can find the evidence and which questions remain open. If FR-118 is still missing, the gap remains visible even when a workshop task has been closed.

Use a consistent handover record

Start with the following fields and adapt them to the equipment and procedures in use:

• Equipment ID, serial number and configuration reference.
• Job, well or site and run reference.
• Dispatch and return document references, with actual event dates.
• Usage quantity, unit, period and source; outstanding information if incomplete.
• Field observations and attachments, without rewriting them as diagnoses.
• Work-order reference, findings, authorized work and component changes.
• Review outcome, responsible person, date and unresolved actions.

The record should be understandable to someone who did not work on the previous job. If the explanation depends on a private message or a person's memory, bring that information into the controlled record or link to the appropriate evidence.

Check the history before planning the next job

Look for mismatched serial numbers, a configuration that does not match the returned assembly, unsourced usage quantities and workshop work without a corresponding return observation or inspection finding. Check that outstanding reports have an owner and that the decision needed for the next assignment is identifiable.

Do not invent a standard maintenance interval from another motor family or a generic article. The purpose of the history is to support the requirements that actually apply, including the relevant OEM documentation and the operation's approved procedures.

Where Hafrix helps

Hafrix connects equipment records with dispatches, field usage and maintenance work. The practical starting point is to agree the equipment identity and the meaning of each usage quantity, then follow one unit through a real job and return. A software demonstration should show the supporting records and an unresolved exception, as well as the completed path.

Explore Inventory, Field and Maintenance. Use the field-to-workshop handover guide to define the information passed between teams.

Sources and further reading

The record structure and example above are an original operational framework. GALIP's Mud Motor Handbook, section 9.1, gives an OEM example of recording tool identity, running history and the reason a motor is submitted for repair. Its technical procedures and limits must not be transferred to other motor models.

H&P's technical-paper abstract on fatigue tracking for mud motors and MWDs explains a limitation of rotating-hours-only assessment. Keeping a usage history does not mean the system predicts fatigue or failure.

Product descriptions can be checked in the Hafrix equipment documentation, field-app documentation and maintenance documentation. Use the OEM documentation for the actual motor model when deciding which configuration, operating and maintenance evidence must be recorded.

Browse all articles and guides, or continue with the pre-dispatch checklist.