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Home : Technical
Resources : Test Reports
DUOLINE is a well established
product having been used successfully in numerous countries in
any
and all oil field conditions, and as such, quality and safety trials
have been conducted on the full product range. We value the results
as part of the fundamental support of the quality and integrity
of our business. Please click on any one of the titles to view
the
article summary.
The testing summaries below illustrate a cross sampling of in-house
as well as customer funded testing that demonstrate DUOLINE’s
ability to perform in extreme conditions typically encountered by
oilfield tubulars.
COMBINED LOADING STRESS TESTS
STRESS ENGINEERING SERVICES, INC., HOUSTON, TEXAS, 1995
This test program was carried out for a major oil company
in effort to qualify DUOLINE 20 for use in North Sea offshore
water injection wells. Eight (8) separate test phases were
conducted using 7" 32ppf, L-80 pup joints lined with
DUOLINE 20. The tested joints were threaded with the Nippon
NS-CC-FGL connection. Six (6) of the tests applied combined
external loads in a load frame to simulate stresses applied
in a deviant well. A bending load was applied equivalent to
a 6° per 100 foot bend radius simultaneously with a tension
load applied at 60% of tensile yield strength with internal
pressures of 5500 to 7500 psi applied with water or gas, and
test temperatures ranging from 122°F. to 225°F. Rapid
depressurization cycles were also carried out to demonstrate
the liners ability to tolerate pressure cycles. All test phases
were concluded by successful high voltage Holiday Testing
at a minimum of 15,000 volts. A drift was run through the
connection in all test phases to ensure no internal restriction
was created. Tap water was used for the water testing, and
nitrogen gas was used in the gas phases.
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