Subsurface tubing hanger and stinger assembly

In combination, a hanger for a tubing string including a mandrel having an axial opening and opposite ends, a head with an inverted, generally frusto-conical section connected to one end of said mandrel, a series of slip segments slidably mounted on said one end and engaging said frusto-conical section for generally radial movement relative to said mandrel when sliding upon said frusto-conical section, means for sliding said segments on said section between retracted and set positions in response to hydraulic pressure, an elongated tubular expansion receptacle having a lower end section threadably secured to said head and an internally threaded upper end section, a stinger including an elongated tubular body having a lower end portion telescoped into said receptacle and a protruding end portion extending upwardly from said receptacle, said body being movable between extended and collapsed positions within said receptacle, an annular rib on said body spaced upwardly from the lower end thereof and extending outwardly therefrom in a generally radial direction, a plurality of annular sealing members encircling said lower end portion beneath said rib, a retaining ring threaded onto the lower end portion of said body and forming a shoulder spaced beneath said rib to capture therebetween said sealing members on said body, a collar telescoped onto said body above said rib and including an upper edge and a plurality of angularly-spaced downwardly extending spring fingers with free ends normally disposed for abutment with said rib, a series of axially spaced teeth formed on and facing radially outward from the free ends of said spring fingers, said teeth latching with said receptacle in said internally threaded upper end section, said rib abutting said free ends of said spring fingers with said stinger body in said extended position and thereby limiting upward movement of said body within said receptacle, a plurality of axially extending, circumferentially-spaced grooves formed in said stinger body with said grooves in angular registry with said spring fingers, said grooves further each having a lower terminus spaced upwardly from said rib and being of a radial depth to receive its associated finger when the latter is flexed radially inward thereby to release said teeth from said threaded upper end section of said receptacle, a section of said body defined between said termini and said rib and supporting said fingers against radially inward flexure thereof when aligned axially therewith in said extended position of said body, a setting sleeve mounted on said protruding end portion of said body and having an annular shoulder formed thereon to engage said upper edge of said collar to force the latter downwardly so said spring fingers telescope with a snap-fit into said upper end section of said receptacle when initially connecting said stinger together with said receptacle, a collet with a set of resilient latching fingers telescoped between said body and said setting sleeve, said collar having an internal latching surface for mating with said latching fingers to lock said stinger body in a collapsed position with said grooves disposed radially relative to said spring fingers for the latter to flex radially inwardly to release said stinger from said receptacle when lifted relative to the latter, locking mechanism connected between said setting sleeve and said stinger body and normally supporting said sleeve in a lower position on said stinger body relative to said resilient latching fingers, and said mechanism further including an annular piston sealed between said stinger body and said sleeve and having a depending annular skirt integrally formed therewith, a series of angularly-spaced dogs each having an inwardly directed radial leg and a segment integrally formed therewith and extending upwardly therefrom in a generally axial direction, an annular recess formed in the interior wall surface of said setting sleeve and receiving said segments, said skirt normally extending between said segments and said stinger and thereby captivating said segments in said recess, an annular slot formed in the exterior surface of said stinger body with said dog legs being partially received therein, a first pressure chamber on one side of said piston and a second pressure chamber on the other side of said piston and sealed from each other, pressure-equalizing means for normally keeping the hydraulic pressures within said chambers substantially equal to avoid unintentional shifting of said piston within said chambers even though the chambers may be subjected to high pressures, and tool means positionable in said body for rendering said pressure-equalizing means ineffective and for communicating high hydraulic pressure to one of said chambers to the exclusion of the other of said chambers and thereby cause said piston to slide within said chambers and thereby move said skirt from alongside said dog segment and release said dogs for sliding radially inward to allow said sleeve to be shifted into its upper position.

A subsurface tubing hanger and stinger assembly for use in a tubing string in a well to enable reinstallation of a safety valve in the tubing string above the hanger without disturbing the tubing string suspended from the hanger, said hanger including a tubular mandrel with an upper end and a lower end adapted for supportive connection to the tubing string, a hanger head connected to said upper end and having an inverted, generally frusto-conical outer surface, a plurality of slip segments angularly spaced from each other and slidably connected to said outer surface for movement radially relative to said mandrel between retracted and set positions, hydraulic actuating means for sliding said segments between said retracted and set positions, a tubular receptacle on said head and opening upwardly therefrom, a tubular stinger slidably telescoped with said receptacle for movement between extended and collapsed positions relative thereto for adjusting the overall vertical length of said assembly, a slide seal connected between said receptacle and said stinger for sealing against pressure leakage between said stinger and said receptacle, a catch located between said stinger and said hanger and movable between a locked position connecting said stinger and said hanger together against axial separation and an unlocked position releasably connecting said stinger and said hanger together for axial separation upon application of predetermined lifting force to said stinger, a latch mounted on the stinger and connectable with said catch to hold the latter in its unlocked position.