Abstract: A retrievable inflatable plug system features distinct seal and anchor elements where the seal element features overlapping ribs preferably metallic and preferably overlapping. The ribs extend the substantial length of the packer and are disposed under the annularly shaped sealing element. The anchor features exposed continuous ribs extending from opposed ends with one or more stiffener rings disposed on the exposed ribs. The elements can be inflated separately or together and include valving systems to allow deflation for selective removal of the plug to put a well back into service.

Abstract: A through tubing casing plug is disclosed. It features a stack of nested cup shaped elements that initially slope to reduce the run in diameter. The stack is compressed to force the periphery of the nested cups to move outwardly so that the collective outer surfaces of the cups can seal on the casing. The cups have sufficient initial thickness so that they remain intact despite some radial growth resulting from the compression process. In a particular example, the run in dimension is 2.13 inches and the stack expands to seal against casing with an inside diameter of 6.9 inches while holding a differential of 500 pounds per square inch and more.

Abstract: An inflatable packer or bridge plug utilized in well bores comprises a tubular elastomeric bladder that is circumferentially surrounded by flexible metallic rib elements. At opposite ends of the packer, the ribs are secured to the inside bore of respective end sleeves by welding and by non-welded bonding. The rib ends are corner bead welded to the end sleeve bore wall to overlie a circumferential undercut of the sleeve bore wall. A second, circumferential weld bead fuses an adjacent sleeve ring to the first and integrates peripheral elements of the ribs. One or more radial vents into the undercut facilitates distribution of a low temperature bonding compound such as epoxy or polyester resins or braze metal or solder. The welding procedures are carried to completion before the bonding agents are applied.