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Seal for a borehole annulus
PATENTS interconnect the inside and outside faces) and each one includes at least two compressible lobes – an outer lobe close to the outside face and an inner lobe close to the inside face – so as to provide at least two distinct sealing zones when the seal is mounted between the flanges. When mounted, the gasket is compressed and the elastically deformable material flows across the side faces to form two distinct sealing zones. The gasket presents two lobes on each side face: a primary sealing zone which is exposed to the media passing through the flanges and a secondary sealing zone that forms a back-up seal. The latter reduces the risk of failure of the seal. Patent number: WO/2012/090171 Inventors: K. Turner and I. Jones Publication date: 5 July 2012
Composite chromium plating film for a piston ring Applicant: Nippon Piston Ring Co Ltd, Japan This invention aims to create a piston ring in which hard particles can be uniformly filled into cracks occurring on a hard chromium plate that is applied to a sliding surface and which has excellent long-term stability. According to this patent, a composite chromium plating film is used in which is formed a crack-like groove. The groove is filled with hard particles. These are irregular and possess the following powder characteristic properties: an average circularity degree of 0.70– 0.85; an average equivalent circle diameter of 6.0 μm or less; and an aspect ratio of 1.3 or more. The composite chromium plating film can be applied to the sliding surface of a piston ring. Patent number: WO/2012/091047 Inventors: T. Okazaki, E. Tamegai, H. Kamiyama and K. Ogawa Publication date: 5 July 2012
Seal for a borehole annulus Applicant: Schlumberger Canada Ltd, Canada; Services Petroliers Schlumberger, France; Schlumberger Holdings Ltd, UK; Schlumberger Technology Bv,
December 2012
The Netherlands; and Prad Research and Development Ltd, UK This patent discloses details of an apparatus and methods that are suited to creating a seal in a borehole annulus. In particular, it covers a seal with enhanced capabilities. One embodiment describes a reinforced and permanent ‘‘swellable’’ packer device. Patent number: WO/2012/097071 Inventors: A. Robisson, F. Auzerais, S. Maheshwari, K.-C. Chen, P. Ganguly and N. Vaidya Publication date: 19 July 2012
Flow-line diverter seal with spring-energised lips Applicant: Parker-Hannifin Corp, USA A seal for installation in a flow-line diverter assembly – including a housing with a bore, and a spool received within the bore – is described by this patent. The seal includes an annular body configured to be received between the spool and the bore. The body also has an inner diameter face positioned opposite the spool, and an outer diameter face positioned opposite the bore. The inner diameter face has first and second lips which are energised by fluid pressure. An annular first spring member is moulded into the outer diameter face adjacent to the first end-face of the body, and an annular second spring member is moulded into the body outer diameter face adjacent to a second endface. (In general, annular third and fourth spring members also may be moulded into a corresponding part of the body lip portions.) This design offers a number of advantages, claims the inventor. For instance, it avoids the use of rigid end-caps, which results in a weight reduction and increased reliability by eliminating the potential for bond failure between the end-caps and the seal body. Additional advantages include improved sealing function through the use of springenergised sealing lips. In this way the lips can maintain contact with the spool even under offset conditions. Further advantages include the use of flexible anti-extrusion elements on the outside diameter of the seal, which can move to seal the extrusion gap while the seal is under pressure.
Patent number: WO/2012/096755 Inventor: T.R. Smith Publication date: 19 July 2012
Seal ring Applicant: Kabushiki Kaisha Riken, Japan This patent provides details of a seal ring that is manufactured from a mixture containing a soft material, made from at least one kind of thermoplastic elastomer and dynamic crosslinked resin, and a hard material made from a thermoplastic resin. After being used for an extended period the seal ring is able to maintain close contact with an inner peripheral surface of a housing in a zero load state where no hydraulic pressure is generated, to prevent leakage of oil effectively. The mixture constituting the seal ring preferably exhibits a compression permanent deformation equal to or less than 95% after being immersed in lubricating and hydraulic oil at 150°C for 100 hours. Patent number: WO/2012/096387 Inventors: H. Ito and A. Oowada Publication date: 19 July 2012
Seal equipped with a sensor Applicant: NTN Corp, Japan The bearing seal described by this patent is equipped with a sensor. The bearing is configured in such a way that status information detailing its operation can be detected. According to the inventors, this bearing can be used in any form of installation. It is also interchangeable with existing bearing designs. The structure comprises inner and outer rings; rolling bodies, disposed between these rings; and the seal which is positioned in the bearing space between the inner and outer rings. In addition to including one or more sensors, for detecting the status information relating to the bearing, the seal also provides a means of handling data for managing the information detected by the sensors; and a source of electrical power – a power-generating system – for driving the datahandling unit and the sensors. Patent number: WO/2012/098980 Inventors: H. Kondou and T. Umemoto Publication date: 26 July 2012
Sealing Technology
15
Composite chromium plating film for a piston ring Applicant: Nippon Piston Ring Co Ltd, Japan This invention aims to create a piston ring in which hard particles can be uniformly filled into cracks occurring on a hard chromium plate that is applied to a sliding surface and which has excellent long-term stability. According to this patent, a composite chromium plating film is used in which is formed a crack-like groove. The groove is filled with hard particles. These are irregular and possess the following powder characteristic properties: an average circularity degree of 0.70– 0.85; an average equivalent circle diameter of 6.0 μm or less; and an aspect ratio of 1.3 or more. The composite chromium plating film can be applied to the sliding surface of a piston ring. Patent number: WO/2012/091047 Inventors: T. Okazaki, E. Tamegai, H. Kamiyama and K. Ogawa Publication date: 5 July 2012
Seal for a borehole annulus Applicant: Schlumberger Canada Ltd, Canada; Services Petroliers Schlumberger, France; Schlumberger Holdings Ltd, UK; Schlumberger Technology Bv,
December 2012
The Netherlands; and Prad Research and Development Ltd, UK This patent discloses details of an apparatus and methods that are suited to creating a seal in a borehole annulus. In particular, it covers a seal with enhanced capabilities. One embodiment describes a reinforced and permanent ‘‘swellable’’ packer device. Patent number: WO/2012/097071 Inventors: A. Robisson, F. Auzerais, S. Maheshwari, K.-C. Chen, P. Ganguly and N. Vaidya Publication date: 19 July 2012
Flow-line diverter seal with spring-energised lips Applicant: Parker-Hannifin Corp, USA A seal for installation in a flow-line diverter assembly – including a housing with a bore, and a spool received within the bore – is described by this patent. The seal includes an annular body configured to be received between the spool and the bore. The body also has an inner diameter face positioned opposite the spool, and an outer diameter face positioned opposite the bore. The inner diameter face has first and second lips which are energised by fluid pressure. An annular first spring member is moulded into the outer diameter face adjacent to the first end-face of the body, and an annular second spring member is moulded into the body outer diameter face adjacent to a second endface. (In general, annular third and fourth spring members also may be moulded into a corresponding part of the body lip portions.) This design offers a number of advantages, claims the inventor. For instance, it avoids the use of rigid end-caps, which results in a weight reduction and increased reliability by eliminating the potential for bond failure between the end-caps and the seal body. Additional advantages include improved sealing function through the use of springenergised sealing lips. In this way the lips can maintain contact with the spool even under offset conditions. Further advantages include the use of flexible anti-extrusion elements on the outside diameter of the seal, which can move to seal the extrusion gap while the seal is under pressure.
Patent number: WO/2012/096755 Inventor: T.R. Smith Publication date: 19 July 2012
Seal ring Applicant: Kabushiki Kaisha Riken, Japan This patent provides details of a seal ring that is manufactured from a mixture containing a soft material, made from at least one kind of thermoplastic elastomer and dynamic crosslinked resin, and a hard material made from a thermoplastic resin. After being used for an extended period the seal ring is able to maintain close contact with an inner peripheral surface of a housing in a zero load state where no hydraulic pressure is generated, to prevent leakage of oil effectively. The mixture constituting the seal ring preferably exhibits a compression permanent deformation equal to or less than 95% after being immersed in lubricating and hydraulic oil at 150°C for 100 hours. Patent number: WO/2012/096387 Inventors: H. Ito and A. Oowada Publication date: 19 July 2012
Seal equipped with a sensor Applicant: NTN Corp, Japan The bearing seal described by this patent is equipped with a sensor. The bearing is configured in such a way that status information detailing its operation can be detected. According to the inventors, this bearing can be used in any form of installation. It is also interchangeable with existing bearing designs. The structure comprises inner and outer rings; rolling bodies, disposed between these rings; and the seal which is positioned in the bearing space between the inner and outer rings. In addition to including one or more sensors, for detecting the status information relating to the bearing, the seal also provides a means of handling data for managing the information detected by the sensors; and a source of electrical power – a power-generating system – for driving the datahandling unit and the sensors. Patent number: WO/2012/098980 Inventors: H. Kondou and T. Umemoto Publication date: 26 July 2012
Sealing Technology
15