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8/10/2019 Pos Grip http://slidepdf.com/reader/full/pos-grip 1/2 POS-GRIP POS-GRIP TECHNOLOGY TECHNOLOGY www.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 no fretting 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 and sets 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
