| Code Group | Cause | |------------|-------| | 100–199 | Electrical (motor winding, cable insulation) | | 200–299 | Mechanical (shaft break, bearing wear) | | 300–399 | Sand & abrasives | | 400–499 | Gas lock or gas interference | | 500–599 | Corrosion / scale | | 600–699 | Operational (off-design, cycling, overheating) | | 700–799 | Installation error (twisted cable, wrong torque) | | 800–899 | Unknown / unclassified |
Always assign a primary failure code when pulling an ESP to build statistical reliability data. api rp 11s2
| Section | Topic | Key Points | |---------|-------|-------------| | | ESP System Components | Pump, Intake, Seal, Motor, Cable, VSD, Sensors | | 5 | System Sizing & Selection | Well inflow, pump curves, motor HP, voltage selection | | 6 | Installation Procedures | Make-up torque, cable handling, tubing/ casing fit | | 7 | Commissioning & Startup | Motor insulation checks, soft-start, gas handling | | 8 | Operation & Monitoring | Drawdown limits, motor temperature, vibration limits | | 9 | Troubleshooting | Common failure modes: electrical, mechanical, sand, gas, corrosion | | 10 | Pull & Inspection | Root cause analysis, component tear-down criteria | | Annex A | ESP Failure Reporting Form | Standardized failure coding | | Annex B | ESP Run-Life Analysis | Statistical methods | | Code Group | Cause | |------------|-------| |
Typically uses water as the test medium, with specific gravity adjustments made for actual well fluids. Instrumentation: api rp 11s2