The Manufacturer (new values may be added in lookup data maintenance), Model, Lobes and Stages fields are important for complete and consistent mud motor record reports. The nominal rotation speed (revs/gallon or revs/liter) are input according to the ‘Volume (small)’ unit of measurement setting and will automatically be converted (as all numerical fields) if the unit is changed.
The Sealed Bearing, Short Bearing Pack and Flexed Stator Housing fields should be checked if the mud motor is equipped with these features. For example: if the motor has an open marine bearing, the Sealed Bearing field should remain unchecked. Note that the Piston Depth field on the surface tests will be labeled as Bearing Play if the Sealed Bearing field is unchecked. For both the pre-run and post run surface tests, two different values for Flow rate and Pressure may be recorded. These will be printed on the Motor Run Report.
Mean-time between failure (MTBF) tracking
For reliability tracking the Estimated Number of Stalls of Hours Jarred on the motor (if applicable) may be input. The Include in MTBF records field determines whether the motor run is included in Mean Time Between Failure (MTBF) reporting. By default this field is checked but may be left unchecked for third-party motors. For MTBF calculations one of the following values must be selected in the Failure Level field:
|
Failure level |
Description |
|
No failure |
No failure or problem occurred whilst using the mud motor |
|
Problem Perceived (PP) |
A problem occurred whilst picking up, running or laying down the tool but no operational time was lost. |
|
Service Interrupt (SI) |
A problem occurred whilst picking up, running or laying down the tool causing the loss of operational time (non-productive time) |
|
Trip for Service Interrupt (TSI) |
As Service Interrupt but in addition the tool had to be pulled out of hole to remedy the problem. |
It should be noted that for MTBF calculations, the failure levels are composite. In other words, a Service Interrupt implies a Problem Perceived and a Trip for Service Interrupt implies a Service Interrupt as well as a Problem Perceived. As a result, if one of each occurred, the following numbers would be reported:
|
Run # |
PP |
SI |
TSI |
|
… |
… |
… |
… |
|
5 |
1 |
0 |
0 |
|
6 |
1 |
1 |
0 |
|
7 |
1 |
1 |
1 |
|
… |
… |
… |
… |
|
TOTAL |
3 |
2 |
1 |
Thus the PP’s and SI in the highlighted cells did not actually occur but are implied by the higher failure level occurring. To track the hours lost due to Service Interrupts and Trips for Service Interrupt, the Service Interrupt Hours field may be completed. Clicking the calculator button will calculate the total hours of all daily activity records labeled as Service Interrupt.
Any accessories used or run with the motor (i.e. stabilizer sleeves) may be recorded in the Accessory data grid, but such data must exist in the Accessory Inventory on the Well form.
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