Abstract: A tube cleaning article removes material from a tube in a well. A resilient member defines an encompassing path around a portion of the outer surface of the tube. The resilient member has a metallic inner surface biased toward the tube when the member is mounted on the tube such that the metallic inner surface scrapes material from the outer surface of the tube in response to reciprocating the tube relative to the resilient member. The metallic inner surface preferably presents more than two metallic edges along a longitudinal path of the outer surface of the tube. A particular implementation includes a split metallic ring. The split preferably extends at a transverse angle to the axial length of the ring. A spacer can be used with the ring. The spacer mounts on the tube such that the ring, when mounted on the tube, is between upper and lower portions of the spacer.

Abstract: A centralizer apparatus having turbolizer protuberances includes groups of openings for receiving set screws to define a plurality of circumferential and longitudinal points of engagement between the centralizer and a tubular string to which it is attached. Associated with the centralizer is a bonding layer of adhesive material, which is injected through one of the openings while the centralizer is rotated relative to the tubular string to obtain a rigid bond between an outer surface of the tubular string and a majority of the inner surface of the centralizer. The bond can be broken by the external application of heat so that, after also loosening the screws, the centralizer can be removed from the tubular string.

Abstract: A centralizer apparatus having turbolizer protuberances includes groups of openings for receiving set screws to define a plurality of circumferential and longitudinal points of engagement between the centralizer and a tubular string to which it is attached. Associated with the centralizer is a bonding layer of adhesive material, which is injected through one of the openings while the centralizer is rotated relative to the tubular string to obtain a rigid bond between an outer surface of the tubular string and a majority of the inner surface of the centralizer. The bond can be broken by the external application of heat so that, after also loosening the screws, the centralizer can be removed from the tubular string.

Abstract: Well completion apparatus for disposition in a well conduit comprising first and second seal assemblies. The first seal assembly comprises a first cylindrical receptacle member fixed with respect to the well conduit and a first insert member including a first tubular body portion received within the first receptacle member. One of the first members includes a first annular seal coaxial with and sealingly engaged between the first receptacle member and the first tubular body portion. The second seal assembly comprises a second cylindrical receptacle member rigidly adjoining the first tubular body portion and a second insert member including a second tubular body portion received within the second receptacle member. One of the second members includes a second annular seal means coaxial with and sealingly engaged between the second receptacle member and the second tubular body portion.