The disclosed invention concerns a method for installing and operating a thermal well (110) heat carrier transport system (100). A first flexible tubular part (120) is provided into and along a thermal well (110), a second flexible tubular part (130) is provided into the first flexible tubular part (120) and a third open ended tubular part (140) is provided into the second flexible tubular part (130). During installation and operation an installation liquid and heat carrier, respectively, is provided into the second flexible tubular part at an overpressure sufficient to press the first flexible tubular part (120) radially against the inner all of the thermal well (110) in all radial directions. The invention also concerns a system.

A system includes a tubular disposed within a borehole, a sleeve disposed around the tubular, and an isolation element bounded to an outer diameter of the sleeve. The inner diameter of the sleeve is connected to an outer diameter of the tubular via a plurality of seals. The isolation element is configured to conform to a surface of the borehole when the isolation element is in an expanded configuration. The sleeve compensates for movement of the tubular by being able to freely move across the tubular.

A system includes a subsurface safety valve and a lock tool. The subsurface safety valve is installed within the production tubing and has a main bore delineated by an inner circumferential surface of the subsurface safety valve and a lock profile machined into the inner circumferential surface of the subsurface safety valve. The lock tool is movably disposed around a conduit and has a locking dog configured to engage with the lock profile of the subsurface safety valve and a conduit seal made of a swellable elastomer. The conduit seal is activated by an activation fluid and has an expanded position and an unexpanded position.

A system includes a subsurface safety valve and a lock tool. The subsurface safety valve is installed within the production tubing and has a main bore delineated by an inner circumferential surface of the subsurface safety valve and a lock profile machined into the inner circumferential surface of the subsurface safety valve. The lock tool is movably disposed around a conduit and has a locking dog configured to engage with the lock profile of the subsurface safety valve and a conduit seal made of a swellable elastomer. The conduit seal is activated by an activation fluid and has an expanded position and an unexpanded position.

A sealing assembly for a downhole device has first (12) and second sealing (22) components which are urged together to make up the assembly such that a first sealing surface (34) on the first component radially presses a lip member (44) on the second component to change the angle of a second sealing surface (45) in the connected assembly. The components are urged together by a driving member (60) which can have screw threads that cooperate with the first component. The lip may be annular and may be formed by an undercut or recess (42) radially inwardly or outwardly of the lip member, allowing the lip member to bend radially inwards into the recess, during insertion of the second sealing component into the first.

A sealing assembly for a downhole device has first (12) and second sealing (22) components which are urged together to make up the assembly such that a first sealing surface (34) on the first component radially presses a lip member (44) on the second component to change the angle of a second sealing surface (45) in the connected assembly. The components are urged together by a driving member (60) which can have screw threads that cooperate with the first component. The lip may be annular and may be formed by an undercut or recess (42) radially inwardly or outwardly of the lip member, allowing the lip member to bend radially inwards into the recess, during insertion of the second sealing component into the first.

Certain aspects are directed to self-assembling packers that seal an annulus in a downhole wellbore. In one aspect, the packer is formed from a magnetorheological fluid, which may be a carrier fluid formed from a polymer precursor and magnetically responsive particles. The fluid is allowed to be shaped by a magnetic field provided by one or more magnets exerting a radially extending magnetic field from a tubing section used to place the packer.

Certain aspects are directed to self-assembling packers that seal an annulus in a downhole wellbore. In one aspect, the packer is formed from a magnetorheological fluid, which may be a carrier fluid formed from a polymer precursor and magnetically responsive particles. The fluid is allowed to be shaped by a magnetic field provided by one or more magnets exerting a radially extending magnetic field from a tubing section used to place the packer.

A multilateral junction comprising a y-block and a port seal member. The y-block comprises a main bore, a lateral bore, and lateral port formed in the y-block. The port seal member is integrated within the main bore and has at least one of an opened, closed, and choked position. The multilateral junction also includes one or more gaskets configured to hydraulically isolate the lateral bore when the port seal member is in a closed position. The multilateral junction may further include a controller coupled to the port seal member for performing at least one of an opening, closing, and choking operation on the port seal member. The y-block is a single, machined object with the main bore and the lateral bore formed therein. The multilateral junction is useful in applications that require pressure tight seals and minimal restriction of the internal diameter of a main bore.

A multilateral junction comprising a y-block and a port seal member. The y-block comprises a main bore, a lateral bore, and lateral port formed in the y-block. The port seal member is integrated within the main bore and has at least one of an opened, closed, and choked position. The multilateral junction also includes one or more gaskets configured to hydraulically isolate the lateral bore when the port seal member is in a closed position. The multilateral junction may further include a controller coupled to the port seal member for performing at least one of an opening, closing, and choking operation on the port seal member. The y-block is a single, machined object with the main bore and the lateral bore formed therein. The multilateral junction is useful in applications that require pressure tight seals and minimal restriction of the internal diameter of a main bore.