Encapsulating commercial accelerometers with epoxy and fluoroelastomer for harsh hydrocarbon fluid environment

Area of Science:

• Materials Science
• Mechanical Engineering
• Petroleum Engineering

Background:

• Accelerometers are crucial for condition monitoring of oil and gas pumps.
• External mounting limits their effectiveness in harsh downhole environments.
• Existing solutions fail to protect accelerometers submerged in hydrocarbon fluids.

Purpose of the Study:

• To evaluate epoxy and fluoroelastomer as encapsulation materials for accelerometers.
• To assess the impact of encapsulation on accelerometer performance in high-temperature hydrocarbon fluid.
• To develop a reliable solution for downhole pump monitoring.

Main Methods:

• Accelerometers were encapsulated with epoxy and fluoroelastomer.
• Encapsulated sensors underwent long-term submersion testing (10,000+ hours) in hydrocarbon fluid at 150°C and brine.
• Material characterization (mass variation, microscopy, FTIR) and vibration analysis were performed.

Main Results:

• Encapsulation materials showed negligible degradation after extensive testing.
• Encapsulated accelerometers effectively detected vibrations with minimal amplitude alteration.
• The novel encapsulation prevented fluid leakage, outperforming commercial alternatives.

Conclusions:

• Epoxy and fluoroelastomer provide a viable encapsulation solution for accelerometers in high-temperature hydrocarbon environments.
• This technology enhances the reliability and safety of downhole oil pump condition monitoring.
• The developed packaging addresses a critical industry gap for sensor deployment in challenging conditions.