GB2064041A - Improvements in and relating to pipe connectors - Google Patents

Improvements in and relating to pipe connectors Download PDF

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Publication number
GB2064041A
GB2064041A GB8036346A GB8036346A GB2064041A GB 2064041 A GB2064041 A GB 2064041A GB 8036346 A GB8036346 A GB 8036346A GB 8036346 A GB8036346 A GB 8036346A GB 2064041 A GB2064041 A GB 2064041A
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United Kingdom
Prior art keywords
members
projection
connector
conical
frusto
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
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GB8036346A
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GB2064041B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunting Oilfield Services Ltd
Hunting Oilfield Services UK Ltd
Original Assignee
Hunting Oilfield Services Ltd
Hunting Oilfield Services UK Ltd
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Application filed by Hunting Oilfield Services Ltd, Hunting Oilfield Services UK Ltd filed Critical Hunting Oilfield Services Ltd
Priority to GB8036346A priority Critical patent/GB2064041B/en
Publication of GB2064041A publication Critical patent/GB2064041A/en
Application granted granted Critical
Publication of GB2064041B publication Critical patent/GB2064041B/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
    • F16L15/003—Screw-threaded joints; Forms of screw-threads for such joints with conical threads with sealing rings
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
    • F16L15/004—Screw-threaded joints; Forms of screw-threads for such joints with conical threads with axial sealings having at least one plastically deformable sealing surface

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

The present invention relates to a pipe connector, for example for interconnecting pipe sections to form a pipe string for use in the drilling and/or completion of offshore oil or gas wells. The pipe connector comprises a tubular box member 3 for connection to the end of a pipe 4 and a tubular pin member 1 for connection to the end of a pipe 2 and which is telescopically receivable within the box member. The members have corresponding generally frusto-conical peripheral surfaces 5, 6 which overlie one another when the members are fully telescoped together. The surfaces 5, 6 comprise interengageable helical projection and groove means 15, 16, 17 and 18 which extend therealong between end portions 11, 12, 13 and 14 which are arranged to be a shrink fit one on the other. The members of the connector are engageable and releasable by the use of fluid under pressure which is injected between the frusto-conical surfaces when the members are partially interengaged. A radial clearance is provided between the crest and root surfaces of the projection and groove means along which the pressurised fluid can flow. <IMAGE>

Description

SPECIFICATION Improvements in and relating to pipe connectors The present invention relates to improvements in pipe connectors particularly but not exclusively pin and box joints for interconnecting pipe sections to form a pipe string for use in the drilling and/or completion of offshore oil or gas wells, and particularly to a pin and box joint capable of withstanding high axial loads, for example in pile driving.
At present, the pin and box members of connectors used for example in pile driving are screwed together, the threads extending from one end to the other of the cooperating surfaces of the members. This means that the members must be correctly angularly orientated for the threads to interengage as the members approach one another so as to avoid crossing ofthe threads. In offshore operations this can be difficult to achieve and, in addition, when using such a connector in pile driving, it is found that there is a tendency for the members to unscrew.
According to one aspect of the present invention there is provided a pipe connector comprising a tubular box member and a tubular pin member telescopically receivable within the box member, the pin member having a generally frusto-conical outer peripheral surface and the box member having a corresponding generally frustoconical inner peripheral surface which overlies the frusto-conical surface of the pin member when the members are engaged, the frusto-conical surfaces being provided with inter-engageable helical projection and groove means between end portions thereof at each end of each frusto-conical surface, wherein the end portions of the frustoconical surfaces are relatively dimensioned to be a shrink fit one on the other when the frusto-conical members are fully engaged and the projection and groove means are relatively dimensioned to provide a radial clearance between crest and root surfaces thereof when the members are fully engaged, the dimensions of the pin and box members being such that the expansion of the box member and/or contract ion of the pin member resulting from forcing them into engagement does not exceed the elastic limit of the material of the box member and/or the pin member.
The projection and groove means may be relatively dimensioned to be freely interengageable or may be relatively dimensioned to be a shrink fit one in the other.
When the projection and groove means are freely interengageable, the pin and box members may be arranged so that, when they are fully interengaged, a pair of radially extending surfaces of the projection and groove means come into abutment so that axially directed forces can be transmitted between them. These surfaces may be held in abutment by the provision of radially extending surfaces at the ends of the frustoconical surfaces of the pin and box members which are also brought into abutment when the members are fully interengaged.
Preferably each frusto-conical surface is provided with at least one helical projection which defines a helical groove therein, the or each helical projection having a said crest surface and the or each helical groove having a said root surface. The crest and root surfaces preferably lie on conical surfaces having the same conicity. One of the end portions of the frusto-conical surface may lie on the conical surface of the root surface of the or each groove and the other end portion may lie on a conical surface having the same conicity as the conical surfaces of the crest and root surfaces but lying radially inwardly, for the box member, and radially outwardly, for the pin member, of the conical surfaces of the corresponding crest and root surfaces. Preferably the one end portions are at the outer ends of the members.
The members of the pipe connector may be interengaged using fluid under pressure which is supplied between the members when they partially engaged and to this end the box member may be provided with a port opening into the crest or root surface of a projection or groove thereof and for connection to a supply of fluid under pressure.
According to another aspect of the present invention there is provided a method of assembling a pipe connector as described above, the pin and box members thereof being made of metal, the method comprising partially telescoping the members together with axial movement to bring the members into axial alignment and to bring one frusto-conical surface into contact with the other, continuing telescoping the members together by continued relative axial movement together with relative angular movement to cause the projection and groove means to interengage and to bring the outer end portion of the pin member into contact with the frusto-conical surface of the box member adjacent the inner end thereof and the outer end portion of the box member into contact with the frusto conical surface of the pin member adjacent the inner end thereof, and then completing telescoping of the members by continued relative axial and angular movement together with the application of fluid under pressure between the frusto-conical surfaces to cause expansion of the box member and/or contraction of the pin member.
According to a further aspect of the present invention there is provided a pipe connector comprising a tubular pin member and a tubular box member telescopically receivable within the pin member, the pin member having a generally frusto-conical outer peripheral surface and the box member having a corresponding frusto-conical inner peripheral surface which overlies the frusto conical surface of She pin member when the members are engaged, the frusto-conical surfaces being provided with interengageable helical projection and groove means between end portions at each end of each frusto-conical surface, wherein the end portions of the frusto-.
conical surfaces are relatively dimensioned to be a shrink fit one on the other and the helical projection and groove means have a constant radial dimension between the end portions.
The present invention will be more fully understood from the following description of embodiments thereof, given by way of example only, with reference to the accompanying drawings.
In the drawings: Figure 1 is a part axial section, part elevation, of an embodiment of a pipe connector according to the present invention and showing the pin and box members thereof fully interengaged: Figures 2 and 3 are part axial sections showing the pipe coupling of Figure 1 in various stages of assembly; Figure 4 is a part axial section showing the pipe coupling of Figure 1 with the pin and box members thereof fully interengaged; Figure 5 is a part axial section of a modification of the pipe coupling of Figure 1 showing the pin and box members thereof fully interengaged; Figure 6 is an enlargement of the part of the pin member ringed in Figure 2; and Figure 7 is an enlargement of the part of the box member ringed in Figure 2.
The pipe connector shown in the drawings is designed for interconnecting pipe sections to form a pipe string for use in the drilling and/or completion of offshore oil or gas wells and is particularly designed to be capable of withstanding high axial loads, for example in pile driving. For this purpose, the pipe connector is made of metal but it will be appreciated that for other uses, the pipe connector may be made of other materials.
As shown in Figures 1 and 2, the pipe connector comprises a tubular pin member 1 for connection, e.g. by welding, to the end of a pipe 2, and a tubular box member 3 for connection, e.g.
by welding, to the end of a pipe 4 to be connected to pipe 2. The pin and box members are telescopically engageable and have generally frusto-conical outer and inner peripheral surfaces 5, 6 respectively which overlie one another when the pin member is fully telescoped into the box member, as shown in Figure 1. The members 1, 3 have radially extending surfaces 7, 8 at their free outer ends and, when fully telescoped together, one of the radially extending surfaces 7, 8 respectively abuts a radially extending surface 9 or 10 of a shoulder provided respectively at the inner end of the frusto-conical surface of the box and pin members, for the transmission of axially directed forces, for example pile-driving forces, between the members 1, 3. As shown the surface 8 of the box member and the surface 10 of the pin member are in abutment.
The generally frusto-conical peripheral surfaces 5, 6 comprise frusto-conical end portions 1 1, 12 and 13, 14 respectively at the inner and outer ends of the frusto-conical surfaces and, intermediate these end portions, the surfaces are provided with interengageable helical projection and groove means or teeth. As shown, each surface 5, 6 is provided with a single helical projection 15, 16 respectively, each projection in effect defining a single helical groove 17, 18 respectively.
As shown in Figures 6 and 7, each projection 15, 16 has a crest surface 1 spa, 1 6a and two oppositely directed radially extending end surfaces 1 sub, 1 sic, and 1 6b, 1 6c. The surfaces 1 sub, 1 sic and 1 6b, 1 6c form the radially extending surfaces of the corresponding grooves 17, 18 and these grooves have root surfaces 17a, 1 spa. The projection and groove means of the two frustoconical surfaces 5, 6 have substantially equal axial extents and have constant radial extents along the surfaces so that the root surfaces 1 7a, 1 8a-of the grooves lie on respective conical surfaces 1 7x, 1 8x which have the same conicity as the conical surfaces 1 sox, 1 6x on which the crest surfaces 1 spa, 1 6a of the respective projections lie.
The surfaces 5, 6 are dimensioned so that, when the members are fully interengaged, the overlying end portions 1 1, 13 and 12, 14 4 are a shrink fit one on the other and there is a radial clearance at least between the crest surfaces of the projections and the root surfaces of the grooves. To obtain this, the end surfaces 11 and 14 at the inner ends of the pin and box members lie on conical surfaces 1 1x, 1 4x having the same conicity as the conical surfaces 1 sox, 1 6x, 17x and 1 8x but which are positioned radially outwardly of the conical surfaces 1 5x and 1 7x and radially inwardly of the conical surfaces 1 6x and 1 8x respectively. The end surfaces 12, 13 at the outer ends of the pin and box members lie on the conical surfaces 1 7x, 1 8x respectively.The same results could of course be achieved with other relative dimensioning of the end portions 1 1, 12, 13 and 14 of the frusto-conical surfaces in relation to the dimensions of the projections and grooves.
Additionally, as shown in Figure 4, the projections and grooves may be dimensioned relative to the surfaces 8, 10 so that, when the pin and box members are fully engaged with the surface 8, 10 in abutment, one pair of the radially extending surfaces of the projection and groove means are also in abutment for the transmission of the axially directed forces. As shown surfaces 1 sub, 1 6b are in abutment and. these surfaces preferably extend at an angle to the axis which is close to 900, for example 780. A clearance is provided between the other radially extending surfaces 1 sic, 1 6c, which may extend at the same or, as shown, at a smaller angle to the axis.
To increase the frictional forces holding the pin and box members together, the projection and groove means may alternatively be dimensioned to be a shrink fit so that both pairs of radially extending surfaces 1 sub, 1 6b and 1 sic, 1 6c are in abutting contact when the members are fully interengaged, as shown in Figure 5. In this embodiment, the radially extending surfaces 1 sub, 1 6b, 1 5c, 1 6c may have equal or at least similar inclinations to the axis which may be the same or smaller than the inclination of the surfaces 1 sub, 1 6b in the embodiment of Figure 4.
For assembly and disassembly purposes, a port 19 is provided in the box member 3 opening into the region provided with the projection and groove means either in a crest surface or, as shown, a root surface, and for connection to a source of fluid under pressure.
To assemble the connector, the pin and box members are moved axially together to telescope them until there is metal-to-metal contact between the frusto-conical surfaces 5, 6 as shown in Figure 2. In this condition the pin member has moved.to a sufficient extent into the box member that it is centred relative to the box member and slight angular movement will cause the projections to engage in the grooves, if they are not already engaged. Further axial movement together with angular movement causes the members to be further engaged and this is continued until metal-to-metal contact is achieved at a preset torque, as shown in Figure 3.The conicity of the frusto-conical surfaces 5, 6 and the length of these surfaces are selected so that this metal-to-metal contact is achieved at each end of the overlapped portions of the frusto-conical surfaces 5, 6 between the crest surface of the projection of one member and the surface of the end portion of the other member at least, if not between the surfaces of the corresponding end portions, so that the helical gap between the overlapped portions of the frusto-conical surfaces 5, 6 is substantially sealed at the two ends by the metal-to-metal contact.At this point fluid under pressure is applied to the port 19 and the fluid flows along the helical gap between the two frusto-conical surfaces between the ends and causes the box member to expand and/or the pin member to contract to a sufficient extent to allow further axial and angular movement of the members to telescope them fully together. The pressurised fluid not only causes expansion and/or contraction of the members but also serves as a lubricant between the surfaces of the members where they are initially in metal-to-metal contact to facilitate relative movement between them.
There will of course be a certain leakage of fluid between the end portions of the frusto-conical surfaces of the members but this is not found to be sufficient to reduce the effectiveness of the pressurised fluid. When the members are fully interengaged, pressure on the fluid applied to port 1 9 is removed and excess fluid will drain out along the helical clearance provided between the crest and root surfaces of the projection and groove means and through the port 19 which can then be sealed with a plug.
It will be appreciated that the manner of assembling the connector is the same for both the embodiments of Figures 4 and 5.
O-ring seals 20, 21 may be provided to seal between the surfaces 1 1, 13 and 12, 14 to prevent flow of fluid into or out of the connected pipes in use. To disassemble the joint, it is merely necessary to effect the above operations in reverse, fluid flowing from the port 19 to~the end portions of the surfaces along the helical clearance provided between the crest and root surfaces of the projection and groove means.
It will be appreciated that the extent of expansion and/or contraction of the members which is required to permit them to be fully interengaged is arranged to be within the elastic limit of the materials of the members and, of course, such that the projection and groove means do not become disengaged.
It will also be appreciated that the conicity of the surfaces, the axial length of the surfaces and the number and disposition of the helical projections and grooves can be varied as required depending on the overall dimensions of the coupling and the requirements of the coupling. As a generality, the shrink-fit surfaces 1 1, 13 and 12, 14 and, if need be, the projection and groove means, are arranged to have a frictional force between them sufficient to prevent unscrewing of the coupling under normal operating conditions.
Precisely what these conditions are and therefore the frictional forces required will of course depend on the use of the connector.
In a specific embodiment, the members 1, 13 are made of high tensile steel. The external diameter of the box member is 54.6 cm (21.5 inches) and the internal diameter of the pin member is 47.6 cm (18.75 inches). The conicity of the frusto-conical surfaces is 30 and the surfaces are 15.9 cm (6.25 inches) long. The grooves and projections extend for about 12 cm (4.75 inches) of each surface, the end portions of the surfaces being about 1.9 cm (0.75 inches) long. The projections and grooves have a pitch of 1.27 cm (0.5 inches) and a depth of about 0.25 cm (0.1 inches). In the embodiment of Figure 4, the radially extending end surfaces of the projections and grooves have angles of 120 and 600 respectively to the diametral plane.Metal-tometal contact after axial and angular relative movement between the members and before fluid under pressure is applied is preferably made when there is about 0.8 cm to 0.4 cm of axial movement remaining before the members are fully telescoped.
There is thus provided a pipe connector which can be assembled and disassembled easily and which can require a relatively low level of torque to do so. During assembly, the pin member is centred in the box member before the projections and grooves are interengaged so that there is little risk of crossing of the projections and grooves.
When assembled, the joint will sustain axial loads because of the abutment between the radially extending surfaces thereof and relative angular movement between the members will be prevented by the friction between the shrink-fit portions of the frusto-conical surfaces. Where the projections and grooves are not required to be a shrink fit, they can be produced with ordinary tolerances, only shrink fit portions being required to be manufactured to close tolerances.

Claims (18)

1. A pipe connector comprising a tubular box member and a tubular pin member telescopically receivable within the box member, the pin member having a generally frusto-conical outer peripheral surface and the box member having a corresponding generally frusto-conical inner peripheral surface which overlies the frustoconical surface of the pin member when the members are engaged, the frusto-conical surfaces being provided with interengageable helical projection and groove means between end portions thereof at each end of each frusto-conical surface, wherein the end portions of the frustoconical surfaces are relatively dimensioned to be a shrink fit one on the other when the members are fully engaged and the projection and groove means are relatively dimensioned to provide a radial clearance between crest and root surfaces thereof when the members are fully engaged, the dimensions of the pin and box members being such that the expansion of the box member and/or contraction of the pin member resulting from forcing them into engagement does not exceed the elastic limit of the material of the box member and/or the pin member.
2. A connector as claimed in claim 1, wherein the projection and groove means have radially extending surfaces interconnected by the crest and root surfaces and are relatively dimensioned such that one radially extending surface of a projection on one member is in abutment with one radially extending surface of a groove in the other member when the members are engaged for the transmission of axially directed forces between the members.
3. A connector as claimed in claim 2, wherein the members are provided with radially extending surfaces which are brought into abutment when the members are fully engaged for the transmission of axially directed forces between the members and this abutment maintains the one radially extending surfaces of the projections and grooves in contact.
4. A connector as claimed in claim 3, wherein a clearance is provided between the other ones of the radially extending surfaces of the projections and grooves.
5. A connector as claimed in any one of the preceding claims, wherein the projection and groove means are relatively dimensioned to be a shrink fit so that the radially extending surfaces thereof are in abutment when the members are engaged.
6. A connector as claimed in any one of the preceding claims, wherein the pin member is provided with a helical projection which defines a helical groove and the box member is provided with a helical projection to be received in the helical groove of the pin member and which defines a helical groove for receiving the helical projection of the pin member, wherein the projections and grooves have substantially constant radial dimensions throughout their axial extent.
7. A connector as claimed in claim 6, wherein the projections and grooves have substantially equal axial dimensions.
8. A connector as claimed in either claim 6 or claim 7, wherein each projection has radially extending surfaces interconnected by a crest surface and each groove has radially extending surfaces common with the radially extending surfaces of the projection defining it, and interconnected by a root surface, wherein the crest and root surfaces of the projections and grooves lie on conical surfaces having the same conicity.
9. A connector as claimed in claim 8, wherein the end portions of the frusto-conical surfaces at the free outer ends of the pin and box members lie on the conical surfaces of the corresponding root surfaces.
10. A connector as claimed in claim- 9, wherein the end portions of the frusto-conical surfaces at the inner ends of the pin and box members lie on conical surfaces having the same conicity as the conical surfaces of the crest and root surfaces of the projection and groove means but which are radially spaced inwardly in respect of the box member and outwardly in respect of the pin member of the conical surfaces of the corresponding crest surfaces of the corresponding projections.
11. A connector as claimed in any one of claims 6 to 10, wherein each projection has oppositely directed radially extending surfaces interconnected by a crest surface and the radially extending surfaces are inclined to a diametral plane.
12. A connector as claimed in claim 1 1, wherein the oppositely directed radially extending surfaces of each projection have different inclinations.
13. A connector as claimed in claim 11, wherein the oppositely directed radially extending surfaces of each projection have substantially the same inclination.
14. A connector as claimed in any one of the preceding claims, wherein the box member is provided with a port opening into the crest or root surface of a projection or groove thereof and for connection to a supply of fluid under pressure.
15. A pipe connector substantially as herein described with reference to Figures 1 to 4 and 6 and 7 of the accompanying drawings.
16. A pipe connector substantially as herein described with reference to Figure 5 of the accompanying drawings.
17. A method of assembling a pipe connector as claimed in claim 1, the pin and box members being made of metal, comprising partially telescoping the members together with axial movement to bring the members into axial alignment and to bring one frusto-conical surface into contact with the otherfrusto-conical surface, continuing telescoping the members together by continued axial movement together with angular relative movement to cause the projection and groove means to interengage and to bring the outer end portion of the pin member into contact with the frusto-conical surface of the box member adjacent the inner end thereof and the outer end portion of the box member into contact with the frusto-conical surface of the pin member adjacent the inner end thereof and then completing telescoping of the members by continued axial and angular movement together with the application of fluid under pressure between the frusto-conical surfaces to cause expansion of the box member and/or contraction of the pin member.
18. A method of assembling a pipe connector as claimed in claim 1 substantially as herein described with reference to the accompanying drawings.
GB8036346A 1979-11-19 1980-11-12 Pipe connectors Expired GB2064041B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8036346A GB2064041B (en) 1979-11-19 1980-11-12 Pipe connectors

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7939920 1979-11-19
GB8036346A GB2064041B (en) 1979-11-19 1980-11-12 Pipe connectors

Publications (2)

Publication Number Publication Date
GB2064041A true GB2064041A (en) 1981-06-10
GB2064041B GB2064041B (en) 1983-07-27

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GB8036346A Expired GB2064041B (en) 1979-11-19 1980-11-12 Pipe connectors

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FR2508970A1 (en) * 1981-07-06 1983-01-07 Dril Quip Inc CONNECTING ASSEMBLY, CONNECTING APPARATUS, JOINT OF TUBES AND METHOD OF MAKING A SCREW CONNECTION BETWEEN TWO LONGITUDINAL ELEMENTS
FR2520049A1 (en) * 1982-01-18 1983-07-22 Hunting Oilfield Services Ltd FITTING FOR TUBES, IN PARTICULAR JOINT OF DRILLING RODS
FR2520050A1 (en) * 1982-01-18 1983-07-22 Hunting Oilfield Services Ltd PIPE CONNECTION, IN PARTICULAR DRILLING ROD JOINT, HYDRAULIC COUPLING AND COUPLING
FR2526079A2 (en) * 1982-04-29 1983-11-04 Dril Quip Inc CONNECTOR ASSEMBLY
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GB2124315A (en) * 1982-05-25 1984-02-15 Jagelid Kjell Inge Gunnar Pipe joint
EP0127560A2 (en) * 1983-04-29 1984-12-05 Baker Hughes Incorporated Threaded coupling comprising a ventable seal
FR2560345A1 (en) * 1983-10-19 1985-08-30 Vetco Offshore Ind Inc AUTOMATIC CONNECTOR FOR TUBES
US4629223A (en) * 1983-09-06 1986-12-16 Hunting Oilfield Services (Uk) Limited Pipe connector
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US4720124A (en) * 1985-08-02 1988-01-19 Cameron Iron Works, Inc. Telescoping joint
US4828294A (en) * 1985-09-12 1989-05-09 Vallourec Threaded joint for steel pipes containing a sealing device located at the level of the threading
US4828295A (en) * 1984-10-10 1989-05-09 Vallourec Steel tube threaded joint having an impervious device at the level of the threading
US4928999A (en) * 1984-04-30 1990-05-29 Hydril Company Elastomeric guard seal for tubular connections
US5029906A (en) * 1983-04-29 1991-07-09 Baker Hughes Incorporated Method and apparatus for forming a ventable seal
WO1994029565A1 (en) * 1993-06-09 1994-12-22 Shell Internationale Research Maatschappij B.V. Multiple-seal underwater pipe-riser connector
GB2309276A (en) * 1996-01-20 1997-07-23 Boart Longyear Ltd Threaded joint
GB2323903A (en) * 1997-04-02 1998-10-07 Cummins Engine Co Inc A fluid connector
EP0957233A2 (en) * 1998-05-12 1999-11-17 Dril-Quip, Inc. Threaded connector
GB2338042A (en) * 1998-06-04 1999-12-08 Cooper Cameron Corp Riser joint
US6755444B2 (en) * 2000-03-30 2004-06-29 Sumitomo Metal Industries, Ltd. Slim-type threaded joint for oil well pipes
EP1591380A1 (en) * 2004-04-30 2005-11-02 Delaware Capital Formation, Inc. Drop tube segments adapted for use with a liquid reservoir
US7213610B2 (en) 2004-04-30 2007-05-08 Delaware Capital Formation, Inc. Drop tube segments adapted for use with a liquid reservoir and methods
US7243675B2 (en) 2004-04-30 2007-07-17 Delaware Capital Formation, Inc. Drop tube segments adapted for use with a liquid reservoir
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US7437815B2 (en) 2004-04-30 2008-10-21 Delaware Capital Formation, Inc. Systems adapted to cooperate with an aperture forming tool and methods
WO2010121345A1 (en) * 2009-04-23 2010-10-28 Schlumberger Canada Limited Drill bit assembly having electrically isolated gap joint for electromagnetic telemetry
WO2010121344A1 (en) * 2009-04-23 2010-10-28 Schlumberger Holdings Limited A drill bit assembly having aligned features
WO2013115649A1 (en) * 2012-02-02 2013-08-08 Torsion Tool Company As Coupling and method for providing same
WO2014146428A1 (en) * 2013-03-21 2014-09-25 宝山钢铁股份有限公司 Ultrahigh torsion resistant metal hermetic seal drill rod joint
DE102013213737A1 (en) * 2013-07-12 2015-01-15 Siegthalerfabrik Gmbh Flange for connecting two components, in particular a tower of a wind turbine
NO20180062A1 (en) * 2017-01-31 2018-08-01 Torsion Tool Company As A coupling
WO2018143819A1 (en) 2017-01-31 2018-08-09 Torsion Tool Company As A coupling
EP3822449A1 (en) 2017-01-31 2021-05-19 Torsion Tool Company AS A coupling

Cited By (58)

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