Lube-Tech PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE
No.108 page 5
The below graph shows the percentage weight loss after 24 hours at temperature by reference to HPHT, Seal-Guard ECF and a Competitor Environmental Grade (CEG):
At high temperatures the product will not only be expected to remain stable but also to form an effective seal for casing joints and perform to the extreme internal pressures of the application. Well engineers go to great lengths to insure the integrity of their wells and failure is not considered an option in these types of applications. In further optimisation of solid lubricants particle size distribution was considered a key factor in delivering improved sealing properties, development formulations considered various different particle size combinations in relation to frictional profiles and sealing ability. By extending the particle size from 0-50 microns in Seal-Guard ECF to 0-200 microns in HPHT Jet-Lube had been able to deliver a more robust sealing ability comparable to its lead based counterpart. Field testing with Statoil is ongoing but initial results indicate a deliverable service enhancement of up to 230°C, some 90°C higher than any other environmental product currently available in the market. Furthermore this allows HPHT to be used on both 8-round & buttress thread types, as well as the proprietary mechanical seal thread forms.
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The below graph shows the particle size distribution in API-Modified, Jet-Lube used this profile to develop a refined practice sized distribution for HPHT:
LUBE MAGAZINE NO.137 FEBRUARY 2017
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