Browse Prior Art Database

Bonded Seal with Hinge

IP.com Disclosure Number: IPCOM000243483D
Publication Date: 2015-Sep-24
Document File: 1 page(s) / 14K

Publishing Venue

The IP.com Prior Art Database

Abstract

A metal Insert for a Bonded Seal has a "hinge" shape so that pressure applied to the Seal will cause the outer section of the hinge to flair out and close off the extrusion gap between the Bonded Seal and a seal bore. Bonded Seals are used to seal tubing strings or work strings to Packer bores. An elastomer is bonded to the OD of a metal Insert and provides a bi-directional static or dynamic seal with the Packer bore. An O-Ring on the ID of the Insert provides a static seal with the component that is attached to the tubing/work string. Pressure/temperature rating of a Bonded Seal can be limited by the extrusion resistance of the bonded elastomer and the O-Ring. The O-Ring seal is static and the extrusion gap is tightly controlled by the fit of the metal Insert onto the OD of the tubing string component. Back-up Rings can also be added to the O-Ring groove. However, the bonded elastomer on the OD of the metal Insert is exposed to a much greater extrusion gap - the gap between the Packer bore and the OD of the metal Insert. Packing Elements that are also required to span large extrusion gaps depend on mesh back-ups or plastically deformable Threaded Back-Up Rings. However the thin wall section of a Bonded Seal does not allow for such a means of extrusion resistance. What is proposed is to design a metal Insert with a "hinge" shape so that pressure applied to the Bonded Seal will cause the outer section of the hinge to flair out and close off the extrusion gap with the Packer bore. An angled cavity in the sidewalls of the Insert extends for the full circumference of the part. So, under pressure, that outer section of the Insert is exposed to a bending moment that will cause it to flex outward. Since the seal point for the bonded rubber is at the tip of the outer section, movement of the section closes off the extrusion gap. The design shown presumes the construction method to be that of 3-d printing (additive manufacturing). That manner would allow for a generous radius to placed in the cavity at the point of maximum bending moment. It might also require some "sprues" to be present in order to fix the outer section during the building process. Those sprues would be removed by a secondary lathe operation prior to the bonding process. Vent holes may need to connect to the cavity to allow for free travel of bonding agent and elastomer during the molding process. In this concept, a bi-metallic Insert is used. The Insert to be made by 3-d printing where the feed cord is changed from one metal to another so that both hinge profiles are made of a second metal with properties conducive to the purpose of that section. That is to say, the metal that the hinge sections are made from could have a higher yield strength to better withstand bending stresses or could be made of a more gall-resistant metal to prevent scratching the bore of the Packer. The part could also be made by a H.I.P. (Hot Isostatic Pressing) process and the profile cut by lathe

This text was extracted from a Microsoft Word document.
This is the abbreviated version, containing approximately 52% of the total text.

58963

Bonded Seal with Hinge

A metal Insert for a Bonded Seal has a "hinge" shape so that pressure applied to the Seal will cause the outer section of the hinge to flair out and close off the extrusion gap between the Bonded Seal and a seal bore.

Bonded Seals are used to seal tubing strings or work strings to Packer bores. An elastomer is bonded to the OD of a metal Insert and provides a bi-directional static or dynamic seal with the Packer bore. An O-Ring on the ID of the Insert provides a static seal with the component that is attached to the tubing/work string. Pressure/temperature rating of a Bonded Seal can be limited by the extrusion resistance of the bonded elastomer and the O-Ring. The O-Ring seal is static and the extrusion gap is tightly controlled by the fit of the metal Insert onto the OD of the tubing string component. Back-up Rings can also be added to the O-Ring groove. However, the bonded elastomer on the OD of the metal Insert is exposed to a much greater extrusion gap - the gap between the Packer bore and the OD of the metal Insert. Packing Elements that are also required to span large extrusion gaps depend on mesh back-ups or plastically deformable Threaded Back-Up Rings. However the thin wall section of a Bonded Seal does not allow for such a means of extrusion resistance. What is proposed is to design a metal Insert with a "hinge" shape so that pressure applied to the Bonded Seal will cause the outer section of the hinge to flair out and close off the extrusion gap with the Packer bore.  An angled cav...