A system to provide at least two circumferential metal to metal seals between coaxial tubulars. Where a first tubular includes a circumferential shoulder having a circumferential first metal seal and a circumferential second metal seal. A second tubular has a circumferential shoulder that matches and abuts the first tubular circumferential shoulder. Each metal seal is of a material having a higher yield strength than the second tubular shoulder such that the first metal seal and the second metal seal will penetrate the material of the second tubular shoulder thereby providing a seal. Additionally a test port is provided from the exterior of the exterior tubular to a point on either the first or second tubular between the first and second metal seals.

A downhole packer assembly includes a body part, an expandable tubular packer element surrounding the body part, and a first end and a second end of the expandable tubular packer element are fixedly connected with the body part, providing an expandable space fillable with liquid during expansion, and a metal sleeve surrounding the expandable tubular packer element. A restriction unit has an axially movable part movable between a first axial position in which the axially movable part at least partly overlaps the expandable tubular packer element and a second axial position in which the axially movable part has been axially displaced in relation to the body part away from the expandable tubular packer element.

The present invention relates to a downhole expandable tubular for expansion in a well downhole from a first outer diameter to a second outer diameter to abut against an inner face of a well tubular metal structure or borehole, the downhole expandable tubular having an outer face, a longitudinal extension and a tubular length along the longitudinal extension. The invention also relates to an annular barrier for expansion in an annulus between a well tubular metal structure and an inner face of a borehole or another well tubular metal structure for providing zone isolation between a first zone and a second zone of the borehole. Moreover, the invention relates to a downhole system comprising a well tubular metal structure having an inner face, an outer face, a downhole expandable tubular being connected to the inner face, and a downhole closure unit arranged on the outer face for permanently sealing off a control line controlling a well component of the well tubular metal structure prior to plug and abandonment of a well having a top.

Finally, the invention relates to a method of permanently closing fluid communication in the downhole closure unit for permanently sealing off a control line prior to plug and abandonment of a well.

A wellhead annulus packoff and an associated method of energizing and de-energizing are disclosed. The wellhead annulus packoff includes at least one seal element, a hanger lockdown ring, a hanger lockdown energizing ring, a seal lockdown ring, a seal lockdown energizing ring, and one or more mechanical conditional operators, where the at least one seal element adapted to be energized with a first energizing force applied through a seal lockdown energizing ring and with the one or more mechanical conditional operators being engaged, where the seal lockdown ring is adapted to be energized with the first energizing force and with the one or more mechanical conditional operators being disengaged, and where the hanger lockdown ring is adapted to be energized with a second energizing force applied through a hanger lockdown energizing ring.

A wellbore is plugged using a bismuth alloy. The wellbore is arranged so that a liquid bismuth alloy sets with an excess pressure of the plug relative to the borehole fluid pressure along a desired seal height distance.

A settable downhole tool with preset metallic split rings having gaps from their leading edges to their trailing edges. The rings expand radially outward during setting by widening the gaps, adjacent rings covering the gaps, creating a substantially fluid tight metal to metal seal with the casing.

A female undersea hydraulic coupling member is equipped with a plurality of pressure-energized metal seals configured to seal between the body of the female member and the probe of a corresponding male hydraulic coupling member in response to ambient hydrostatic pressure and/or hydraulic fluid pressure. Pressure-energized metal seals may also be provided to seal between the body of the female coupling member and a removable seal retainer or seal cartridge. In one particular preferred embodiment, the pressure-energized seals are back-to-back metal C-seals separated by annular seal supports having a generally T-shaped cross section and retained on one or more shoulders in the body of the female member by a removable seal cartridge.

A packoff assembly comprises: a tubing connectable mandrel; and at least one packoff element disposed on the mandrel; the packoff element comprising an annular seal comprising a carbon composite and having an inner surface and an opposing outer surface; the inner surface being in contact with a surface of the mandrel; a wear-resistant member at least partially encapsulating the seal; an annular guide member disposed on the mandrel; and a retainer member disposed between the guide member and the mandrel for securing the guide member to a predetermined position on the mandrel.

A pressure control device for sealing a conduit is described. The pressure control device comprises a seal element comprising an elastomer, the seal element defining a seal element external surface portion, the seal element external surface portion defining an external perimeter. The external perimeter is adapted to increase as an environmental temperature increases, such that, in use, an increase in the environmental temperature can move the seal element external surface portion into engagement with the conduit or, once engaged with the conduit or if already engaged with the conduit, can create an improved seal with the conduit.

Provided is a multilateral junction. The multilateral junction, in one aspect, includes a y-block. The multilateral junction additionally includes a mainbore leg coupled to the y-block, the mainbore leg defining a second overlapping space, and a lateral bore leg coupled to the y-block, the lateral bore leg defining a third overlapping space. The multilateral junction, in this aspect, additionally includes an expanded metal joint located in at least a portion of the second overlapping space or the third overlapping space, the expanded metal joint comprising a metal that has expanded in response to hydrolysis.