Oil & Gas Screw Compressors Reliability
Rotary Screw Compressor Reliability & Maintenance maintenance and reliability for Reliability Consulting for Oil & Gas Operations facilities.
Why it matters
Key Benefits
Reliable Gas Gathering and Boosting
Performance monitoring ensures screw compressors on gas gathering systems maintain the suction conditions needed to flow gas from wellheads without backpressure that restricts production.
Maintained Gas Lift Supply Pressure
Discharge pressure and temperature trending confirms gas lift compressors deliver the injection pressure and flow rates that artificial lift well designs require for optimum production.
Extended Rotor Life in Wet Gas Service
Rotor condition tracking through efficiency monitoring and vibration analysis extends compressor run time in the wet gas and sour gas conditions common in upstream oil and gas applications.
Context
Challenge & Approach
The Reliability Challenge
Screw compressors on vapor recovery units (VRUs) handle variable gas compositions with liquid slugs that erode rotor profiles. Oil separator element degradation on oil-flooded screws allows hydrocarbon contamination of downstream systems. VRU compressors must maintain suction to prevent tank venting and associated VOC emissions regulated under EPA NSPS OOOOa. Instrument air screw compressors at remote production facilities operate with minimal supervision and harsh ambient conditions. Gas gathering screw compressors face corrosion from H2S and CO2 in sour wellhead gas. Rotor clearance increase from wear reduces volumetric efficiency, causing compressors to fall behind production gas rates.
Our Approach
We perform specific energy and volumetric efficiency analysis to quantify rotor wear and internal leakage. Oil carryover testing downstream of separators assesses contamination risk. Vibration analysis on rotor bearings detects wear and bearing defects. Gas composition review against rotor and seal material compatibility identifies corrosion-driven degradation risks. We evaluate VRU capacity against current tank vapor generation rates to verify emission capture compliance. Our deliverable includes a rotor condition trending program, oil separator maintenance schedule, VRU emission capture verification, and a remote monitoring strategy for compressors at unmanned facilities.
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Learn More →Screw compressors serve gas gathering from low-pressure wellheads, gas lift supply compression, flash gas recovery from production separators, and fuel gas boosting for field generators and heater treaters. Their tolerance for liquid carryover and variable suction conditions makes them well-suited for upstream oil and gas applications where gas composition and flow rates vary as reservoir conditions change over the field life.
Accelerated rotor wear results from sand and formation fines carried in the gas stream, liquid slugs from upset separator conditions that cause rotor impact loads, corrosion from H2S and CO2 in sour gas, and erosion from high-velocity liquid droplets. Inlet gas conditioning with adequate separation, sand filtration, and corrosion inhibitor injection upstream of the compressor are the primary measures for extending rotor life.
Remote monitoring through SCADA systems tracks discharge pressure, discharge temperature, motor or engine power, and operating speed. Trending these parameters against inlet conditions reveals performance degradation from rotor wear, fouling, or control issues. Periodic on-site vibration data collection supplements the remote monitoring data. Automated performance calculations comparing actual versus expected compression ratio at measured conditions enable efficiency trending from the operations center.
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Request a Free Reliability Assessment
Tell us about your equipment and facility. Our reliability team will review your situation and recommend a tailored reliability program — no obligation.
Vapor Recovery Failures Mean Emission Violations
We maintain your screw compressors to capture tank vapors, deliver clean instrument air, and keep your gas gathering operations running.
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