Abstract: A tubular connection is disclosed having a small diameter thread set and a large diameter thread set, the small thread set having a lesser number of threads than the large set. A primary torque shoulder is located between the threads sets and a secondary torque shoulder is located behind the large thread set. In the preferred embodiment, the initial partial thread on the pin of both sets and the last partial thread of the small set on the box has a cylindrical root contour, whereas the remainder of the threads are tapered. The longitudinal taper angle of the pin thread sets are dissimilar to the box thread sets, there being a maximum separation of the sets near the center of the connection. Such dissimilar tapering tends to equalize the stress applied to the threads under tension loading. At the center, a seal is provided with hooked threads on either side thereof. The arrangement also provides a torque shoulder at either end of the large thread set.

Abstract: An axially split clamp for securing the connection between a push-on fitting having a flared end fitted into a cage and surrounded by a garter-type coiled spring housed within the cage on a pipe having a plurality of O-rings sealing the connection between the push-on fitting and the pipe. The two mirror image halves of the axially split clamp are sized to snugly encircle the cage housing the coiled spring of the pipe while at the same time snugly encircling the adjacent outer surface of the push-on fitting. The two halves of the clamp are then securely joined together by a pair of screws threaded into aligned threaded holes in both halves of the clamp.

Abstract: An improved annular seal between tubular members in a subsea wellhead having an annular seal member with a U shape in section with the opening facing upwardly and two interengaged annular wedges for energizing the sealing surfaces of the inner and outer portions of the seal member at different levels. The interengagement of the wedges includes sufficient play to provide proper energizing of both inner and outer sealing surfaces at the same time. Further, the inner sealing surface is positioned at a much higher level than the outer sealing surface and close to the upper end of the inner member in which it is to seal to minimize the setting force for the inner sleeve and to minimize the amount of drag the seal will incur when retrieved. Also, the location of the outer sealing surface close to the inner member shoulder minimizes the reaction path of the lockdown sleeve.

Abstract: A engageable joint having male pipe end and a female pipe end. The male and female pipe ends are removably engaged with gaskets. The gaskets are inflatable and arranged in a plurality of stages in the axial direction to inflatably seal a clearance between the pipe ends, and the joint has a clamp device for clamping the two pipe ends so that the pipe ends can be engaged and disengaged readily and reliably.

Abstract: A pipe coupling for a stainless steel well casing includes a square threaded male member which is received within a square threaded female member so that the coupling is initially loose. O-ring seals are provided to prevent the fluid being pumped from corroding threaded portions of the male and female members. Each member has a shoulder which is abutted by the end of the other member in order to lock the members in rigid relationship.

Abstract: A pipe joint for connecting a pipe having a relatively small diameter includes a generally cylindrical main body having an axial bore in which an end portion of the pipe and a plurality of seal rings surrounding the end portion of the pipe can be fitted. The main body has a tubular extension defining a connector for another tubular member to be connected to the pipe by the joint and having an axial bore which can be connected with that of the pipe. The main body also has a plurality of pawl projections or a shoulder on its outer peripheral surface. The pipe has a radially outwardly projecting wall portion near its end portion. A generally cylindrical cap has an end wall portion provided therethrough with a central opening through which the pipe can extend into the main body, and a plurality of resilient arms projecting from its end wall portion.

Abstract: A locking assembly for securing the connection between a push-on fitting having a flared end fitted into a cage and surrounded by a garter-type coiled spring housed within the cage on a pipe having a plurality of O-rings sealing the connection between the push-on fitting and the pipe. The assembly comprises an axially split male fitting and an axially split locking nut. The two halves of the axially split male fitting are sized to snugly encircle the push-on fitting with the ends of the two halves of the male fitting resting against the flared end of the push-on fitting and thus forcing the coiled spring away from the push-on fitting. The two halves of the axially split locking nut snugly encircle the cage housing the coiled spring while an internal face of the two halves of the nut engage and securely lock the position of the two halves of the male fitting.

Abstract: An improved pressure type connection on stepped-thread Hydril-type tubing and casing tool joints is disclosed, wherein a secondary sealing means is included between the stepped threaded areas of the Hydril-type connector. The secondary sealing means includes an annular ring of relatively rigid, internally tenacious plastic or rubber material, which serves to contain well pressure if the metal-to-metal sealing surfaces on the pin and box members of the Hydril-type connector are damaged. With such secondary sealing rings, damaged Hydrill-type connectors can still be used, without having to scrap same, or having to repair the damaged area at great expense.

Abstract: A seal assembly for a shaft comprises one or more annular sealing elements having an initial internal diameter larger than the diameter of the shaft. The elements are deformed by a pair of annular backup rings disposed on opposite sides thereof. The backup rings have opposed axially extending undulations therein for effecting axial deformation and radial contraction of the sealing elements upon advancement of the backup rings toward one another.

Abstract: A stripping gland is specially designed to act on uneven surfaced leads or the like making up a bundle that extends down into a well. It includes plural interior annular grooves which accommodate flexible seals. It also has an upper cylindrical chamber that has a highly elastic stationary seal which may be compressed tightly around the bundle.

Abstract: A section of metal pipe has one end connected to a main line pipe. A hollow cylindrical plastic piston having a plurality of O-rings thereabout is slidingly and sealingly received within the open end of the metal section. A plastic carrier pipe is fixedly received within the outwardly facing end of the piston for suitable interconnection to other equipment. First and second limits are spaced along the pipe section to locate the piston within the pipe section. These limits may be flanges machined into the pipe section, or the pipe section may be rolled so as to include an inwardly directed, circumferentially extending ridge. In a further version, the transition joint is incorporated into a riser arrangement in which the plastic carrier is located within an outer tubing or pipe and held spaced from the tubing walls throughout the entire length of the tubing. Also, replacement of a service line is accomplished by threading plastic pipe through original line and terminating via transition joints at each end.

Abstract: A stab-type coupling apparatus adapted to receive an associated pipe end in a body thereof and prevent its withdrawal therefrom. The coupling apparatus includes an elongated hollow stiffener received in a coupling body recess and providing internal support for the associated pipe end. A retaining ring retained between the body and stiffener has a radially inward extending toothed portion that grippingly engages the external surface of the associated pipe end. A seal means is disposed on an axially inner side of a collet retainer to seal along a peripheral portion of the pipe end. The collet retainer includes a toothed internal surface that selectively engages the pipe end during attempted withdrawal from the coupling body. A generally frustoconical member cams the collet retainer into gripping engagement with the pipe end. A gasket is radially and axially compressed at an outer end of the recess and disposed on an opposite side of the collet retainer from the seal means.

Abstract: A coupling arrangement comprising first and second telescoping connecting components which, when telescopingly engaged, are locked by a locking device attached to one of the components and introduced into a first recess in the other component to place the coupling in a first locking position with incomplete sealing and then into a fully connected, locked and sealed position with the locking device introduced into a second recess in the other component.

Abstract: A connection for well tubular goods including a male member, a female member, each having a double set of steep tapered hook threads, two internal pressure seals including a compressible primary metal-to-metal seal and a supplementary seal made up of a resilient corrosion resistant material and additionally, a primary resilient corrosion resistant external pressure seal, and a reverse shoulder engagement between the end of the male member and a shoulder on the female member to hold the primary metal sealing surfaces in sealing engagement.

Abstract: A swivel joint for pipes includes a split collet carried by a male portion of the coupling, and which provides an abutment for a threaded annular nut carried by a female member of the coupling, the nut being lockable in its adjusted position, the male member being rotatable within the female member to provide for swivelling of the joint.

Abstract: This is a novel swivel joint for connecting two fluid conveying conduits. It includes an inner cylinder connected to one conduit and an outer cylinder connected to the other conduit. There is a double seal with a pressure chamber therebetween the two cylinders at one end thereof and a second double seal with pressure chamber therebetween at the other end. Four sets of bearing means are located between the inner and outer cylinders between the two double seals.

Abstract: A connecting arrangement comprising a threaded sleeve of synthetic plastic material and a tube portion having a pipe thread. The threaded sleeve contains an insert nut with an internal thread and a synthetic plastic ring which is engaged by the pipe thread of the tube portion. The tube portion has at its forward end a supplemental sealing ring which sealingly engages a sealing region of the synthetic plastic ring. The sealing region is spaced from the axial ends of the threaded sleeve and has an inner diameter which is smaller than the outer diameter of the sealing ring. A further seal may be provided by disposing an adhesive sealing mass in an annular groove on the tube portion such that the mass adheres the tube portion to the sleeve when they are connected.

Abstract: A connector, for example for connecting pipe sections, comprises a female member having threaded internal circumferential surfaces at each end, for engagement with a pair of male members each of which is provided with a threaded external circumferential surface. Each male member is provided with an annular nose having an axially directed primary sealing surface for sealing abutment with the primary sealing surface of the other male member, and a circumferential secondary sealing surface for sealing against a secondary sealing surface on the female member. The sealing surfaces being initially shaped so that when the noses are initially brought into contact there are progressively widening axial and radial gaps therebetween which are closed by deformation of the noses when the members are fully engaged together.

Abstract: A threaded pipe connection is disclosed having tapered sealing surfaces between the ends of the threads on the box and pin that engage and a resilient seal member located in a groove about midway between the ends of one of the surfaces to form a seal with the other surface when the joint is made up with the two surfaces forming independent metal-to-metal seals on both sides of the resilient seal member.

Abstract: A coupling apparatus and method is disclosed for coupling a first and a second hose to enable the flow of fluid therethrough upon the application of fluid pressure comprising a first coupling member having a first internal bore connected to the first hose. A second coupling member having a second internal bore is connected to the second hose. A first and second major thread is disposed on the first and second coupling member, respectively. The first coupling member is insertable into the second coupling member with the first major thread threadably engaging the second major thread. The first and second coupling member being constructed of a resilient and deformable material for enabling radial expansion of the first and second coupling member upon the application of the fluid pressure.

Abstract: The connection consists of two tubular pieces (1 and 2) clamped end to end against each other by means of a clamp collar the jaws of which (8 and 9) engage with conical slopes (5 and 6) of the connection pieces. Sealing is obtained by the close metal to metal contact of a support surface (17) with its opposite part. A gasket (19) ensures a safety seal in case the contact (17) with the opposite part is not completely sealed.

Abstract: The disclosure relates to a tube coupling having a hollow tubular body having collet form couplings at either end thereof to receive and lock tubes in the body at either end. The body has an internal annular wall and an inner lines which extends over the wall shoulder and along the body to either side of the annular wall shoulder towards the locations of the collets. The liner is formed from a material which is inert to the fluid to be passed through the tubes and has integral annular seals to seal with the tubes inserted in the body to prevent loss of fluid from the tubes into parts of the body not covered by the liner.

Abstract: A holddown screw assembly 10 which features a shaft 33, an energizer screw 39 and a detachable contact nose 20 adapted to be assembled in coaxial alignment in a radial bore in a wellhead structure. The shaft is provided with a passage 40 extending from its outer end as the holddown screw is normally used in a wellhead installation to a cross passage 41 at the other end of the shaft. Also, at its outer end, a fitting 32 is attached to facilitate connection to a hydraulic supply line 28. An annular bearing flange 35 is provided on the shaft near its outer end. A packing nut 31 and a set of packing rings 34 are sleeved about the shaft 33 with the nut disposed in abutting relation to the bearing flange 35 where it is held fixed but rotatable thereagainst by means 36. The packing nut is threaded into a threaded section of a bore 11 such as may be provided in the flange 12 of a casing spool 13. By turning the packing nut, the packing ring set may be compressed against a shoulder 37 in the bore 11.

Abstract: A fluid swivel is described, which is especially useful for carrying hydrocarbons at high pressures between stationary and rotating walls of a swivel. The swivel forms a fluid-carrying annular chamber and a pair of gap-like passages lying between the walls and extending from opposite sides of the chamber to the environment, with primary and secondary face seals located along each passage. Each passage includes a portion extending between the seals, the passage portion forming a pair of largely radially-extending wall surfaces, one on the outer wall and one on the inner wall. The radially-extending wall surface on the outer wall faces in a first axial direction, and the outer wall at the secondary seal faces in an opposite axial direction. As a result, if the primary seal should fail, this will not change the axial force on the outer wall. The extrusion gaps at the seals extend in radial directions from the seal, so these gaps do not widen when high pressure is applied to the fluid swivel.

Abstract: A sealing arrangement for the pin and box of a threaded connection between tubular members includes annular piston means for positioning in the box of one of the tubular members. Resilient seal means supported on the piston means seals between the pin end, box and piston means when the pin is threadedly engaged in the box. Additional seal means on the piston means is responsive to fluid pressure in the tubular members whereby the piston means may be urged toward sealing engagement with the pin end and the resilient seal means.

Abstract: A sealing assembly for sealing between a wellhead housing and a casing suspended in the housing including a base ring with an upper surface with inner and outer shoulders and an annular recess between the shoulders, a first energizing ring with a shoulder facing the base ring inner shoulder, a projection to extend into the annular recess and upper lugs with tapered upper surfaces; a second energizing ring surrounding the first ring projection with slots to receive the first ring lugs, a lower surface facing the base ring outer shoulder and upper tapered surfaces; an inner seal ring between the base ring inner shoulder and the first ring shoulder; an outer seal ring between the base ring outer shoulder and the second ring shoulders and means for engaging the tapered surfaces at the first and second rings to energize the seal rings into sealing position.

Abstract: A quick connect tube coupling assembly includes a tube end assembly axially insertable into a coupling body assembly, the latter including a body member provided with a stepped bore therein to receive an elastomeric oil seal, a radially flanged retainer seat, a split ring retainer and a hollow tube nut threadingly received in the body member. The tube end assembly includes a straight walled tube having a lead-in chamfer at its free end and which is provided on its outer peripheral surface with a retainer receiving groove and with an axially spaced apart groove receiving a dust seal ring which is located so as to be wedged against an outwardly flared camming ramp wall at the outboard end of the tube nut during assembly of the tube end assembly into the coupling body assembly.

Abstract: The disclosure relates to a tap or valve body (10) having a bore (11) to receive a tube which is locked in the bore by means of a collet form tube coupling (21) and is sealed to the bore by O-ring seals 17, 18. The collet is encircled by a plastics insert sleeve (22) located in a counter-bore (19) at the end of bore 11 and held therein by a spring ring (39) embedded in the sleeve. The insert sleeve has a tapered bore (27) which converges towards the end of the tape or valve body and with which resilient fingers (32) of the collet engage to be compressed around the tube by the convergent bore to grip and hold the tube in the body.

Abstract: Male and female tubing or pipe ends have tapered thread with a sealing profile and a shoulder seal. A tapered end on the male tube cooperates with a tapered plastic compression seal at an internal shoulder in the female end. A modification has a tapered seat seal with complementary tapers at the end of the male connection and in the innermost part of the female connection. A plastic self-energized O-ring seal is positioned partly within an annular recess at the large end of the tapered seat in the female part.

Abstract: A coupling unit of tubular overlapping conduits that are swivelly coupled to each other and are locked together by a spring loaded hook type rocker arm member centrally hinged upon a boss on the outer overlapping conduit. The rocker arm member has an inward hook at one end and an outward spring member guide push button on the opposite end. The hook end is normally maintained radially inward through an aperature in the outer conduit and the push button is normally positioned radially outward to protrude through an aperature in a protective cover closure bonnet. The hook end of the rocker arm member cooperates with a hook and groove formation on the inner conduit to lock the inner and outer conduits together.

Abstract: A conduit fitting of the quick connect push-in type wherein a tubular member having a radial shoulder is inserted into an annular body sealingly receiving the tube. A tube retainer employs a plurality of resilient fingers to maintain the tube within the body, while other resilient fingers position and maintain the retainer within the body and a third set of fingers engage and retain a seal in location. The retainer is stamped from flat spring steel stock.

Abstract: The disclosure relates to tube couplings in which a hollow body (10) has an opening (11) to receive a tube (15) and a collet (32) having resilient arms encircling the tube in the body to grip the tube. An annular cam (22) is mounted in the body and has a tapered internal cam surface (31) engaged by the collet arms (33) which reduces towards the open end of the body to increase compression of the arms against the tube as the collet is drawn towards the open end of the body to lock the tube in the body. The cam member (27) is mounted in the body for axial adjustment with respect to the body, for example by a screw engagement (28) in the body, to enable the cam to be adjusted with respect to the collet to vary the compressive force applied to the resilient arms.

Abstract: The invention relates to a rotatable pipe coupling for a plurality of pipes comprising a plurality of annular bodies (1,2,3) which are concentric and in interfitted relation with respect to one another instead of being stacked upon each other.

Abstract: A quick-disconnect coupling for a pair of telescopic slidable tubular members has an annular garter spring trapped in a spring housing carried by one of the tubular members. The garter spring is adapted to be lodged between a right-angularly disposed flange on the spring housing and an upwardly-inclined annular flange formed on the end of the other tubular member. The respective flanges are arranged transverse to each other. The components of the coupling are formed conveniently and economically, without the necessity for expensive metal-forming dies, and are easily assembled.

Abstract: A tubular joint or connector of box and pin members is disclosed having two-step tapered threads. Two metal-to-metal seals of complementary engaging sealing surfaces are provided, one adjacent the end of the pin member, the other axially disposed between the two steps. Reverse angle torque shoulders at the end of the pin member and the interior termination of the box member and hooked threads further characterize the joint and box and pin members.

Abstract: A pipe connector comprises a tubular pin member having an outer generally frusto-conical peripheral surface provided with annular projections, and a tubular box member having an inner peripheral surface corresponding to the peripheral surface of the pin member, which overlies the peripheral surface of the pin member when the members are fully engaged together, and is provided with annular grooves in which the projections on the pin member are engaged. At the inner end of the peripheral surface of the pin member, the pin member is provided with an annular projection extending in the direction of the free end thereof, overlying the peripheral surface thereof and providing a first radially outer radial surface portion and a second radially inner radially inwardly directed surface portion. The free end of the box member is provided with corresponding radial and radially outwardly directed surface portions.

Abstract: An arrangement for rapid and simple push-in connection of one end of a hose, pipe or similar element. The outer surface of the end is made of a soft material into which at least one retaining device appertaining to the arrangement can be forced to retain the end inside the arrangement. The arrangement comprises an outer part, an insertion part disposed therein which bears the retention devices, and seals disposed in a cavity which can co-act with the external surface of the end. The insertion part has an inherent retaining or locking effect on the pipe or other element and a retaining position wherein it is movable in relation to the outer part. The seals comprise two sealing devices arranged one on either side of a guiding device disposed in the cavity. This guiding device is provided to guide the end while it is being pushed in. After the push-in connection has been made, the guiding element continues to center the end inside the cavity.

Abstract: A multi-plane swivel connector for use in attaching a pair of fluid conveying members together, the connector including a pair of swivel portions, that connect together at proximate ends, one end being insertable within the other, a double sealed connection provided at the junction of the connection of the swivel ends together, there being a swivel nut securing externally to the outer end of one of the pair of swivel portions, there being a double sealed connection provided between the said swivel nut and the said contiguous swivel portion, there being a pair of O-rings provided at each of the double sealed connections between the swivel portions, and the connection of the swivel nut to one of these swivel portions, said pair of O-rings at each double sealed connection being of step relationship with one O-ring being of greater diameter than the other O-ring, one of the O-rings being formed of fluoro carbon, while the other O-ring of each double sealed connection being formed of fluoro silicone; and during th

Abstract: A pressure-assisted dynamic seal mechanism for sealing two relatively movable members within a tubing string in a well includes a primary seal member having a first cross-sectional area positioned for sealing engagement between the two relatively movable members. The primary seal is pressure-assisted by a back-up seal mechanism comprising a second seal member having a cross-sectional area greater than the cross-sectional area of the primary seal member and a third seal member having a cross-sectional area greater than the cross-sectional area of the second seal member. The pressures which act directly across the primary seal member also act in the same direction across the third seal member, whereas these pressures act in an opposite direction across the second seal member.

Abstract: This invention relates to a tight connection device comprising a flexible metal joint. The joint, located in two trapezoidal grooves formed in two flanges, has in the rest condition an oval section, whereof one of the axes of symmetry is located in the plane of symmetry of the joints. The joint is in tight contact with the sides of the groove in four zones and, after securing the tie rods, is in contact with the bottom of the grooves in two zones.

Abstract: A seal arrangement for a fluid swivel joint such as is commonly used on offshore loading terminals for tankers. The sealed fluid joint includes first and second adjacent joint rings which are rotatable relative to each other about a common central longitudinal axis. The joint rings have a small annular, ring-shaped clearance gap therebetween to allow relative rotational movement, and one of the rings includes an annular seal housing groove facing the clearance gap. An annular seal is positioned in the seal housing groove, and its componets include a pliant annular, sealing member and an adjacent free-floating anti-extrusion ring to prevent the pliant sealing member from being deformed into the clearance gap by a relatively high fluid pressure differential existing across the seal.

Abstract: A nipple for use in a Christmas tree bypass tool has an outer, molded rubber sleeve thereon and an inner steel insert, a portion of which forms a seal against a skirt on the rubber sleeve. The seal between the insert and the skirt prevents high pressure in the tool from reaching and acting on the bond between the rubber sleeve and the nipple.

Abstract: A tube coupling with only a body and a threaded member is disclosed, the threaded member usually being a nut to overlie an outer sleeve and an inner sleeve unitary with the body. These two sleeves define therebetween an annular groove to receive the end of the tube. The method of tightening the nut onto the body provides that a generally conical cam surface on the nut interacts with a shallower taper conical cam follower surface on the outer sleeve to force this cam follower surface radially inwardly and longitudinally inwardly forming annular radially inward bulges on the outer and inner sleeves and on the tube trapped therebetween. This interlocks the tube with the coupling, and provides a fluid seal at three different places, the inner wall of the tube, the outer wall of the tube, and the end of the tube at the bottom of the groove.

Abstract: A tube coupling having a male body, a female body for receiving at least a portion of the male body and at least one peripheral member made from a relatively compressible plastic material molded into a groove within either the relatively rigid male or female body. The peripheral member is disposed to become compresed against a surface of the mating body to form a liquid seal. At least two peripheral members disposed in grooves in a tubular shaped end portion of the male body are made of a compressible plastic and serve as liquid sealing and locking means. The female body comprises a receiving end portion with a tapered interior adapted to receive the male tubular end portion. As the tubular end portion is inserted into the receiving end portion, one of the peripheral members engages the tapered interior surface and becomes compressed there against as the tubular end portion is further inserted.

Abstract: A joint for interconnecting a pair of pipes having two-step Hydril-type connection means disposed thereupon. A secondary sealing means is disposed on the pin member connection means within a thread groove which forms part of the seal housing along with pin and box member torque shoulders.

Abstract: A piping suspender with a metal-to-metal seal includes a piping hanger with an annular extension received in a counterbore of a well head and confined by a head adapter. The extension includes upwardly and downwardly facing, generally horizontally disposed shoulders. The upwardly facing shoulder abuts with the lower face of the head adapter and the downwardly facing shoulder abuts with an annular, generally horizontally disposed shoulder on the well head, to sealingly support the piping hanger and connected piping on the well head and to seal the hanger with respect to the adapter. A set of test lines are provided to enable seal testing.

Abstract: A high pressure rotary union includes a housing enclosing a hollowed shaft. seal enclosure is keyed within the housing and receives a sealing ring which is biased by a circular spring to maintain low friction intimate sealing engagement between the ring and shaft despite minor eccentric shaft displacement.

Abstract: A small-diameter tubing connector and sealing apparatus for anchoring a tubing end in fluidtight engagement in high pressure service (up to 60,000 psi), said apparatus having four separate sealing areas.

Abstract: A marine riser coupling assembly comprised of a pair of flanged couplings (14, 16). A pin insert (36) is retained (44, 54) within tubular portions (22, 24) of the couplings. The insert has multiple outside diameters (50, 50), and seals (66, 74) on each.

Abstract: A tubular joint or connector of box and pin members is disclosed having first threads provided on a taper with respect to the axis of the joint and second threads which are cylindrical and axially separated from the first threads. The first and second threads are radially separated by a step region. Two metal-to-metal seals of complementary engaging sealing surfaces are provided, one adjacent the end of the pin member, the other axially disposed between the two threads. Reverse angle torque shoulders at the end of the pin member and the interior termination of the box member and hooked threads further characterize the joint and box and pin members.