초록 ▼

An inflatable packer comprising an elastomeric tubular core, an outer cover, an annular reinforcement sheath sandwiched between the core and cover comprising a strength zone composed of strain-resisting elements of high modulus extending helically at alternate lay angles of less than 40°with respect

An inflatable packer comprising an elastomeric tubular core, an outer cover, an annular reinforcement sheath sandwiched between the core and cover comprising a strength zone composed of strain-resisting elements of high modulus extending helically at alternate lay angles of less than 40°with respect to the packer axis, and sleeve means to which the reinforcement is securely attached at each end of the packer. In one embodiment a transition reinforcement zone is interposed between the tubular core and strength zone to improve the flex properties and increase the life of the packer. In another embodiment an improved anchor means formed of a frusto-conical matrix encapsulates embedded reinforcement members.

대표청구항 ▼

An inflatable packer comprising: an elastomeric tubular core; an outer cover; an annular reinforcement sheath sandwiched between the core and cover and comprising multiple reinforcement zones, namely: a strength zone composed of strain-resisting elements of relatively high modulus, said elements bei

An inflatable packer comprising: an elastomeric tubular core; an outer cover; an annular reinforcement sheath sandwiched between the core and cover and comprising multiple reinforcement zones, namely: a strength zone composed of strain-resisting elements of relatively high modulus, said elements being helically disposed, alternately in opposite lay sense within the sheath annulus at lead angle(s) of less than 40°; and a transition zone disposed radially inwardly of the strength zone composed of a plurality of layers of strain-resisting elements of relatively low modulus compared to those of the strength zone, portions of the low modulus elements being helically disposed respectively in opposite lay sense within the sheath annulus at lead angle(s) of less than 40°; and sleeve means to which at least a portion of the reinforcement is attached at respective ends of the packer.