Abstract
Y267 EPDM was recently developed for aqueous geothermal seal applications. The compound has proven eminently successful operating at temperatures in excess of 316C (600F), differential pressures over 69 MPa (10,000 psi), and for multiple exposures before changing the seals. The technology was transferred to three American firms and parts are currently commercially available from them.
There have been opportunities to test the Y267 EPDM technology in numerous fluids beyond geothermal brine, for which it was originally intended. The combination of the opportunity to do some well controlled comprehensive testing, along with special evaluation equipment which tests actual seals under operational conditions enabled radical revelations to be made.
The data are indicating that the cardinal rule against using EPDMs in hydrocarbon applications may be invalid. Significant data are presented illustrating Y267 EPDM technology to be a viable candidate for hostile hydrocarbon service. The data show viable candidacy to the extreme worst case end of the spectrum, i.e., highly aromatic hydrocarbons.
Several case histories are provided which include careful well controlled and comprehensive laboratory tests; independent tests by major tool manufacturers, national laboratories, and major oil companies; and actual field case histories.
The paper also discusses how immersion tests can be highly misleading and that swell can really be a friend rather than a foe.
