Metal-to-metal seal for oil well tubing string

A metal-to-metal seal assembly for connecting a first tubular member to a second tubular member comprising, in combination:

• a tubular seal receptacle having an internal bore surface for engaging a sealing member, said seal receptacle having a first end portion adapted for coupling attachment to the first tubular member and having a tubular end portion disposed for engagement with the second tubular member;
• a tubular seal mandrel disposed within the tubular seal receptacle in radially spaced relation with respect to the internal bore surface thereby defining an annular seal chamber;
• and,
• a tubular seal sleeve disposed in the annular seal chamber, said tubular seal sleeve having a radially deflectable sealing member confined between the internal bore surface of the tubular seal receptacle and the tubular body portion of the seal mandrel.

Well completion apparatus comprising, in combination:

• a well packer having a tubular mandrel, anchor slips and seal elements mounted on the packer mandrel for engaging the internal bore surface of a well casing;
• a latch assembly including a tubular latch mandrel having a first end portion adapted for attachment to a tubing string and having a second end portion adapted for attachment to a seal mandrel, and having a releasable latch member disposed for interlocking engagement with a tubular seal receptacle;
• and,
• a metal-to-metal seal assembly including a tubular seal receptacle having a first end portion disposed in interlocking engagement with the releasable latch member and having a second end portion secured to the packer mandrel, a tubular seal mandrel disposed within the tubular seal receptacle, and a tubular seal sleeve disposed intermediate the seal mandrel and seal receptacle, said seal sleeve having a radially deflectable sealing member between the tubular seal receptacle and the seal mandrel.

A metal-to-metal seal assembly for connecting a tubing string to a well packer comprising, in combination:

• a latch assembly including a tubular latch mandrel having a first end portion adapted for attachment to a tubing string and having a second end portion adapted for attachment to a seal mandrel, and having a releasable latch member disposed for interlocking engagement with a tubular seal receptacle;
• a tubular seal receptacle having a first end portion disposed in interlocking engagement with the releasable latch member, a second end portion adapted for coupling attachment to a packer mandrel, and having an internal bore sealing surface for engaging a sealing member;
• a tubular seal mandrel disposed within the tubular seal receptacle, said tubular seal mandrel having a first end portion secured to the tubular latch mandrel and having a tubular body portion disposed for engagement with a tubular seal sleeve;
• and,
• a tubular seal sleeve mounted on said seal mandrel, said tubular seal sleeve having a radially deflectable sealing member confined between the internal bore surface of the tubular seal receptacle and the tubular body portion of the seal mandrel

A metal-to-metal seal assembly for connecting a first tubular member to a second tubular member comprising, in combination:

• a tubular seal receptacle having a first end portion adapted for coupling attachment to the first tubular member, a second end portion adapted for coupling attachment to the second tubular member, and having an internal bore sealing surface for engaging a sealing member, said internal bore sealing surface being characterized by a first bore sealing surface and a second bore sealing surface which is radially stepped with respect to the first sealing bore surface, and including a lead-in ramp surface interconnecting the first and second bore sealing surfaces;
• a tubular seal mandrel supported within the tubular seal receptacle in radially spaced relation with respect to the internal bore sealing surfaces, said tubular seal mandrel having a tubular body portion disposed for engagement with a tubular seal sleeve;
• and,
• a tubular seal sleeve attached to said seal mandrel, said tubular seal sleeve having a radially deflectable sealing member disposed between the radially stepped bore surface of the tubular seal receptacle and the tubular body portion of the seal mandrel.

A metal-to-metal seal assembly for connecting a first tubular member to a second tubular member comprising, in combination:

• a tubular seal receptacle having an internal sealing bore surface for engaging a sealing member, said seal receptacle having a first end portion adapted for coupling attachment to the first tubular member and having a tubular end portion disposed for engagement with the second tubular member;
• a tubular seal mandrel disposed within the tubular seal receptacle in radially spaced relation with respect to the internal bore surface thereby defining an annular seal chamber;
• a tubular seal sleeve disposed in the annular seal chamber, said tubular seal sleeve having a radially deflectable sealing member confined between the internal bore surface of the tubular seal receptacle and the tubular body portion of the seal mandrel;
• and,
• an annular seal ring compressively confined in sealing engagement between the internal bore surface of the tubular seal sleeve and the external surface of said seal mandrel.