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POS-GRIPPOS-GRIPTECHNOLOGYTECHNOLOGYwww.posgrip.com
POS-GRIP “HG” TUBING HANGERS
“HG” SEALING BENEFITS
M A N D R E L H A N G E R
W E L L H E A D S Y S T E M
P O S - G R I P “ H G ”
W E L L H E A D S Y
S T E M
EFFECTS OF
BORE PRESSURE
EFFECTS OF
ANNULUS PRESSURE
Aberdeen: +44 1224 774 222 email: [email protected]
Houston: +1 713 686 5267 email: [email protected]
London: +44 20 7589 8555 email: [email protected]
www.posgrip.com
POS-GRIP is unique by allowing a high grade metal seal to be set
directly between a hanger and the bore of the wellhead. No separate
annular packoff is required, saving costs, reducing installation time and
enhancing reliability.
POS-GRIP “HG” Seals have proved to be particularly successful at
enduring changes in pressures and temperatures throughout field life.
In conventional Unitized wellhead Systems, these changes cause
fretting at the seal interface and eventual failure of conventional annu-
lar packoffs. The diagrams show how changes in bore pressure and
annular pressure change the shape of the seal pocket in conventional
systems, moving the hanger and “working” the seal which eventually
fails. POS-GRIP radically preloads the entire seal area such that nofretting can occur, even with pressure and temperature changes.
“HG” Metal Seals have been tested to 22,500 psi, and development
programs are under way to qualify “HG” for 30,000 psi and 450 degF.
POS-GRIP “HG” Tubing Hangers are very
simple one piece items, which offer all of
the features of far more complicated
systems. No fluting is necessary on the
hanger outer diameter, and so additional
area is provided for sealing. High load
capacity, multiple externally testable metal
seals, elastomer backup profiles, anti-rotation and preloaded lockdown are all
achieved as the POS-GRIP system is
activated.
The “HG” Tubing Hanger can be run on tubing,
which avoids the cost and complication of a tubing
hanger running tool. The system can by used with
multiple continuous control lines, without added
complexity in the running tool arrangement. Once
the hanger arrives at the correct location in the
wellhead, the POS-GRIP system is activated.
This locks the hanger in torsion, locks it down andsets multiple metal seals – all within minutes of
landing the hanger. A full working pressure cavity
test under the hanger is then possible, as well as
an external pressure test. Once the seal integrity
has been confirmed, the hanger is ready for flow
testing.
HPHT RENTAL WELLHEAD
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