Troubleshooting Guide: Solutions to Oil Extraction Problems with Progressive Cavity Pumps

In oilfield operations and industrial fluid transfer applications, Omron Tech Pumps progressive cavity pumps (PCPs) are renowned for their exceptional capability in handling high-viscosity media. However, under complex operating conditions, these pumps may encounter malfunctions such as excessive vibration, overheating, or failure to discharge oil.

By combining on-site operational data with an analysis of common faults, this guide systematically categorizes the causes of oil extraction issues in progressive cavity pumps and provides standardized solutions. This serves as a technical reference to ensure stable and efficient oilfield production.

I. Core Faults and Standardized Treatment Solutions

1. Severe Vibration and Excessive Noise

Severe shaking and abnormal noise during operation not only compromise equipment stability but also accelerate component wear.

Primary Causes:

• Unbalanced electric rotor, poor coupling alignment, or worn/bent bearings.
• Loose or fractured parts within the rotating assembly.
• Unstable pipeline supports or deviation in installation coaxiality.

Solutions:

• Re-balance the rotor and realign the coupling.
• Repair or replace damaged bearings immediately.
• Tighten all loose fasteners and reinforce pipeline supports.
• Verify and correct installation coaxiality to eliminate vibration at the source.

2. Pipeline Leakage (Oil or Air)

Pipeline leakage directly reduces suction capacity and volumetric efficiency, potentially halting oil extraction entirely.

Primary Causes:

• Loose nuts from improper installation.
• Failure of joint seals (gaskets/O-rings).
• Physical damage to the pipeline.

Solutions:

• Minor Leakage (Emergency): Apply a temporary sealant mixture (e.g., oil sludge and asphalt oil) or use wet clay/soft soap for immediate plugging. Note: These are temporary measures until proper repair.
• Joint Leakage: Directly tighten the connecting nuts to specification.
• Severe Leakage: Disassemble the affected pipeline section, replace all seals/gaskets, and reassemble to ensure a leak-tight connection.

3. Overheating of the Stuffing Box (Packing)

Abnormal temperature rise in the stuffing box can lead to seal failure and shaft surface damage, a critical issue often overlooked on-site.

Primary Causes:

• Over-tightened packing preventing cooling/lubricating oil from entering the seal area.
• Damage or scoring on the pump shaft surface.

Solutions:

• Loosen the packing gland appropriately to allow lubrication flow.
• Clear any blocked channels in the seal flush line.
• Replace worn packing promptly. Installation Tip: Soak new packing rings in engine oil before installation; install rings one by one with staggered joints (typically 90° or 120°); adjust gland tightness after installation to balance heat dissipation and sealing effectiveness.

4. No Oil Suction or Discharge

Equipment idling with no fluid output is a critical fault that stops production immediately.

Primary Causes:

• Stuck foot valves or check valves.
• Clogged filtration components or intake screens.
• Excessive suction lift height.
• Air leakage in the suction pipeline.
• Incorrect motor rotation direction.
• Blockages within the pump cavity.

Solutions:

• Systematically troubleshoot each potential point: repair or free stuck foot valves.
• Remove deposits and clean filtration units.
• Reduce the suction lift height if possible.
• Seal all air leakage points in the suction line.
• Verify and correct the motor rotation direction.
• Crucial Step: Disassemble and clear any blockages within the rotor and stator cavity to restore normal flow. 

5. Insufficient Flow and Low Yield

Actual oil output is significantly lower than the designed displacement, failing to meet production targets.

Primary Causes:

• Mismatch between pump model and current well conditions.
• Internal leakage due to wear of the stator and rotor.
• Interference from gassy crude oil (gas locking).
• Partial blockages in the discharge pipeline.

Solutions:

• Optimize the PCP model selection and adjust the rotational speed (RPM).
• Install or upgrade oil-gas separation devices to handle gassy wells.
• Replace worn stators and rotors in a timely manner to restore volumetric efficiency.
• Dredge pipelines to ensure unobstructed flow channels.

6. Pump Body Seizure and Difficult Startup

Seizure upon restart after shutdown or sudden locking during operation is often caused by medium impurities, wax deposition, or sand accumulation.

Primary Causes:

• Wax buildup solidifying around the rotor.
• Sand settling and locking the rotor-stator interface.
• Large debris entering the pump.

Solutions:

• Implement regular wax removal, hot washing, and sand washing procedures.
• Select sand-resistant and anti-seizure PCP models designed for harsh conditions.
• Adopt soft-start control systems to reduce startup torque shock.
• Warning: Never force startup, as this can cause catastrophic damage to the drive train or pump internals.

7. Motor Overload and Abnormal Current

Abnormally high load currents can burn out the motor during prolonged operation.

Primary Causes:

• Mismatched motor power rating.
• Mechanical jamming or eccentric wear increasing friction.
• Fluid viscosity higher than design parameters.

Solutions:

• Match the motor power rating to the actual operating load requirements.
• Install robust overload protection and Variable Frequency Drive (VFD) systems for current monitoring.
• Eliminate additional loads caused by jamming or misalignment.
• Stabilize operating parameters through continuous monitoring.

Conclusion

As a leading brand in the field of fluid transfer, Omron Tech Pumps is committed to the R&D of high-performance progressive cavity pumps featuring superior wear and corrosion resistance. Beyond manufacturing, we provide comprehensive technical support and after-sales guarantees to ensure your operational success.

Are your progressive cavity pumps facing any of the challenges above?

Click "Online Consultation" below to share your medium viscosity details and fault symptoms. Omron Tech Pumps’s expert technical engineers will provide you with free remote diagnosis and tailored solutions to help your equipment return to peak performance!