Graphite Metallizing Corporation is promoting its GRAPHALLOY® wear rings and bushings in pumps for CO2 service in oil field applications.

The ability to operate without additional lubrication is important in CO2 injection applications because CO2 has low lubricity. Standard metal wear parts rely on the lubricity of the liquid being pumped for proper operation so they are prone to failures in pumps used to inject CO2. In addition, due to high suction pressure required to keep CO2 as a dense phase liquid, flashing is always a possibility.

CO2 injection in older, low flowing wells is becoming an increasingly popular method for permeating rock formations and forcing more oil to the surface. Many older wells still contain vast amounts of oil locked in the pores of rock layers deep underground. CO2 injection often releases more oil in older wells than can be released by water injection.

Self-lubricating Graphalloy is a graphite/metal alloy designed to eliminate concern about bearing failures or possible flashing of CO2.

Used in the manufacture of bushings, bearings and other components for machinery and process equipment, Graphalloy materials are self-lubricating, impervious to temperature extremes from -400°F to +750°F (-240°C to 400°C) and thrive in harsh environments where other bearings fail.

Special grades provide reliable service up to 1000°F (535°C) and higher in non-oxidizing
atmospheres.

Graphite Metallizing Corporation claims that its Graphalloy wear rings and bushings operate at longer intervals without the need for replacements or maintenance which helps reduce downtime and maintenance expenses.