GB2113335A - Improvements in and relating to pipe connectors - Google Patents
Improvements in and relating to pipe connectors Download PDFInfo
- Publication number
- GB2113335A GB2113335A GB08300257A GB8300257A GB2113335A GB 2113335 A GB2113335 A GB 2113335A GB 08300257 A GB08300257 A GB 08300257A GB 8300257 A GB8300257 A GB 8300257A GB 2113335 A GB2113335 A GB 2113335A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grooves
- members
- projections
- frusto
- connector
- Prior art date
- 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
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims description 19
- 230000000875 corresponding effect Effects 0.000 description 11
- 239000000543 intermediate Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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
- F16L37/00—Couplings of the quick-acting type
- F16L37/62—Couplings of the quick-acting type pneumatically or hydraulically actuated
-
- 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
- E21B17/046—Couplings; joints between rod or the like and bit or between rod and rod or the like with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Engineering & Computer Science (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The present invention relates to a pipe connector comprising a tubular box member for which is telescopically engageable with a tubular pin member 3, the members having corresponding frusto-conical inner and outer peripheral surfaces 1, 2. To axially lock the member together, when they are fully telescoped together, the surfaces 1, 2 are provided with interengageable projections 5 and grooves 6 which have varying axial extents and spacings so that, as the members are telescoped together, in all intermediate positions of the members, there is sufficient contact between crests of the grooves and surfaces between the projections to prevent inadvertent engagement of a projection with a groove. <IMAGE>
Description
SPECIFICATION improvements in and relating to pipe connectors
The present invention relates to improvements in pipe connectors particularly but not exclusively for use in connecting pipe sections of a pipe string for use in drilling. More particularly, the invention relates to improvements in the type of pipe connector described in British
Patent Specification No. 1573945, and copending U.K. Applications Nos. 7844120 and 8116889.
In specification No. 1573945, there is described a pipe connector comprising a tubular pin member having a frusto-conical outer peripheral surface and a tubular box member having a frusto-conical inner peripheral surface corresponding to the frusto-conical outer peripheral surface of the pin member. In use the two members are telescoped together and are axially locked together by inter-engageable annular projections and grooves provided on the said peripheral surfaces, the projections and grooves being spaced apart along the two surfaces.
In telescoping the two members together, the members are initially telescoped until surface contact is made between crest surfaces of the projections and surfaces between the grooves at least at the ends of the overlapped portions of the surfaces. Hydraulic fluid under pressure may then be supplied between the overlapped parts of the surface to expand the box member and/or contract the pin member to permit the members to be fully telescoped together.
In order to reduce the axial extent of the members it is convenient to provide projections and grooves which have relatively small axial extents but this may mean that to fully telescope the members together after they have been brought into initial contact, it is necessary to move the individual projections past at least one groove before each projection is aligned with the groove in which it engages. If there is a slight reduction in the pressure of the hydraulic fluid either because of a malfunction of the supply or because there is a sudden undue escape of hydraulic fluid from between the overlapped portions of the members, there is a risk that the projections and grooves may inter-engage before the members are fully telescoped together and it may prove impossible to disengage the projections and grooves.
Accordng to the present invention there is provided a pipe connector comprising a tubular pin member having a frusto-conical outer peripheral surface and a tubular box member for receiving and engageable with the pin member and having a frusto-conical inner peripheral surface which overlies the frustoconical surface of the pin member when the members are fully engaged together, wherein to axially lock the members together the frusto-conical surfaces of the members are provided with axially spaced apart inter-engageable annular projections and grooves, corresponding pairs of which are inter-engaged when the members are fully engaged together, the pairs of projections and grooves having differing axial extents and being arranged so that as the members are brought into full engagement in all intermediate positions of the members, after the frusto-conical surfaces have been brought into initial surface contact, there is contact between the crests of at least some of the projections and surfaces between the grooves which are spaced apart along the length of the overlying parts of the surfaces, to prevent intermediate inter-engagement of projections and grooves before the members are fully engaged together.
All the pairs of projections and grooves may have different axial extents or some may have the same axial extents as others. For example the pairs of projections and grooves intermediate the end projections and grooves may have one of two different axial extents and they may be arranged in a regular or irregular fashion along the length of the surfaces.
As in the above referred to Patents and
Applications, the projections and grooves advantageously have a constant radial height and depth respectively along the length of the surface so that the crest surfaces of the projections, surfaces between the projections, root surfaces of the grooves and surfaces between the grooves all lie on frusto-conical surfaces having the same conicity. Advantageously the crest surfaces of the projections and root surfaces of the grooves are linear in an axial direction.
The radially extending end surface of the projections and grooves may extend in radial planes or be inclined thereto and may have different inclinations at the opposed ends of the projections and grooves, as in the above referred to Patent and Applications.
Additionally, if the pipe connector is to be used under circumstances where it must be capable of transmitting axial forces, the members may be arranged so that when they are fully inter-engaged, a part at least of the free end surface of one of the members is in abutment with a corresponding surface on the other member and is held in abutment by inter-engagement of the projections and grooves, i.e. so that on full engagement of the members there is a force fit between said surfaces of the member and the projections and grooves.
For assisting the engagement of the members and for enabling disengagement of the
members, pressurised fluid, for example hydraulic fluid, may be supplied between the overlapped portions of the members. For this
purpose, the box member may be provided with a radial duct connectable to a supply of hydraulic fluid and opening into the frustoconical surface intermediate the ends. To ensure flow of fluid to all parts of the overlapped surfaces during engagement of the members and after initial engagement thereof, and for enabling disengagement of the members, the box member may be provided with an axially extending groove communicating with the duct and extending to that end of the region provided with the projections and grooves adjacent the free end of the box.The pin may similarly be provided with a groove extending to that end of the region provided with the grooves and projections adjacent the free end of the pin. The grooves extend to intermediate points along the surfaces of the pin and box members such that when the members are fully engaged, the grooves overlap axially and when the members are brought into contact initially, the grooves do not extend beyond the initially overlapped portions.
The present invention will be more fully understood from the following description of an embodiment thereof, given by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a part axial section showing the shaping of the frusto-conical surfaces of the members of an embodiment of a pipe connector according to the present invention;
Figures 2 to 5 are part axial sections similar to those of Fig. 1 showing the members as they are progressively telescoped together;
Figure 6 is a part axial section similar to that of Fig. 1 showing the members when they are fully telescoped together;
Figure 7 is a part axial section showing a pipe connector with the frusto-conical surface shaping of Figs. 1 to 6; and
Figures 8 and 9 are part axial sections of the members of an embodiment of a pipe connector according to the present invention, when the members are brought into initial contact and when the members are fully engaged respectively, and showing means for supplying pressurised fluid to the overlapped surface portions of the members.
Figs. 1 to 6 show the frusto-conical inner and outer peripheral surfaces 1, 2 of tubular pin and box members (or box and pin members) 3, 4 of a pipe connector connected, or for connection, to the ends of two pipes, and of the type described in British Patent Specification No. 1 573945 and co-pending Applications Nos. 7844120 and 8116889, in which the members 3, 4 are telescoped together.
The surfaces 1, 2 are provided with annular projections 5 and grooves 6 which are axially spaced apart along the length thereof and are relatively dimensioned so that, when the members are fully engaged, corresponding one of the projections 5 inter-engage in the grooves 6, as shown in Fig. 6, to axially lock the members together.
Engagement of the members takes place in two stages. Initially the members are brought together until contact is established between
crests of the projections and surfaces between
the grooves. Thereafter force is applied axially
to complete engagement of the members. At the end of the first stage a projection 5 may
yet have to pass over a plurality, for example
3 or 4, grooves 6 before it reaches its corre
sponding groove. To prevent inadvertent en
gagement of a projection 5 with a groove 6
which is not its corresponding groove, i.e.
before the members are fully telescoped to
gether, the corresponding pairs of projections
and grooves are provided with differing axial
extents and spacings along the lengths of the
surfaces 1, 2. The projections and grooves are
arranged, as shown for example in Figs. 2 to
5, so that at intermediate positions during
telescoping of the members 3, 4 at least after
the members have been brought into initial
contact, at least some of the crest surfaces 7
of projections spaced along the length of the
surface 1 and intermediate the ends of the
overlapped portions of the surfaces 1, 2, are
in contact with surfaces 8 between the
grooves to prevent any inter-engagement of
the projections and grooves along any sub
stantial length of the overlapped portions of
the surfaces.
In the specific embodiment, the end surface
portions of the frusto-conical surfaces have
relatively substantially axial extents for sealing
purposes if pressurised fluid is used, as will
be described. Intermediate these surfaces, the
corresponding pairs of projections and
grooves have one of two axial extents and are
arranged randomly to produce the desired
effect. As shown projections 5b, Sd, 59, 5h, Sj and 5m and the corresponding grooves all
have the same axial extent which is different
from that of projections 5c, Se, 5f, Si, 5k and
51 which all have the same smaller axial
extent.Additionally the spacing between pro
jections 5b and 5c, 5c and Sd, 5e and Sf, 5h and 5i, 5i and 5j and 5k and 51 is the same
but larger than the spacing between projec
tions 5a and 5b, 5d and Se, 5f and 5g, 5g and 5h, 5j and 5k and 51 and 5m which is
the same. The spacing of the grooves 6
corresponds.
It will be appreciated that the effect of
providing axially spaced annular projections
and grooves along the length of the surfaces
in an arrangement such as to prevent interme
diate inter-engagement of the projections and
grooves can be obtained in any number of
different ways by appropriate selection of dif
ferent axial extents and spacings for the
spaced projections and grooves.
Apart from the above described relative
axial dimensioning of the projections and
grooves, the pipe connector may have any of
the other features of the pipe connectors described in the above referred to Patent and co-pending Applications.
Specifically, the radical extents of the projections and grooves may be constant over the length of the surfaces so that the crest surfaces 7 of the projections, the surfaces 9 between the projections, the root surfaces 10 of the grooves and the surfaces 8 between the grooves, all lie on frusto-conical surfaces having the same conicity, which may for example be 1 .5' or 2 . The generatrices of the surfaces 7, 8, 9 and 10 may be linear, as shown, in an axial direction. While as shown the radially extending surfaces 11, 12 and 13, 14 at each end of each projection and groove extend in generally radial planes, these surfaces may be inclined to the radial planes.
For example, the surfaces at one end of each projection and the correponding end of the groove may have an inclination to the radial plane of the order of 12 and at the other end of each projection and groove the surfaces may be inclined at an angle of the order of 60 to the radial plane.
As shown in Fig. 7, where the pipe connector is to be used to connect pipes which must be capable of transmitting axial forces, for example for pile driving, an end surface of one of the members may be brought into abutment with a corresponding surface on the other member. For example, as shown in Fig.
7, the box member 3 is provided with a radial surface 20 at its free end which is brought into abutment with a radial surface 21 provided on the pin member 4. To maintain the surfaces in abutment for pile driving purposes, the projections and grooves may be arranged so that there is a force fit between surfaces 20, 21 and radially extending surfaces 12, 13 on the projections and grooves, these radially extending surfaces having an inclination relatively close to the radial plane, for example as previously mentioned at 1 2'. Additionally, the projections and grooves may be arranged so that, when the members 3, 4 are fully engaged, there is a radial clearance between surfaces 7 and 10 and between surfaces 8 and 9 and there may be an axial clearance between surfaces 11 and 14.
The members may be fully engaged by the application of pressurised hydraulic fluid to the overlapped portions of the surfaces following initial contact and may be disengaged in the same way, the pressurised fluid both expanding the box and/or contracting the pin to permit engagement and lubricating the crest surfaces 7 of the projections and surfaces 8 between the grooves to facilitate sliding of these surfaces over one another. For this purpose, as shown in Figs. 8 and 9, the box member 3 may be provided with a radial duct 22 for connection to a source of pressurised hydraulic fluid. The duct 22 opens inwardly of the box into the region of the frustoconical surface of the box which is provided with the projections or grooves.To ensure that the hydraulic fluid is able to flow along the full extent of the overlapped portions of the surfaces of the members, axially extending grooves 30, 31 are provided in both the box member and the pin member, duct 22 opening into groove 30 in the box member.
The pressurised fluid is only required to assist engagement of the members after initial contact has been made. To prevent loss of hydraulic fluid at the ends of the overlapped surfaces before full engagement of the members, the axial extents of the grooves must be limited. Specifically each groove extends from the last groove or recess between projections adjacent the free end of the pin and box respectively to an intermediate position along the corresponding surface which lies within the overlapped portions of the surfaces on initial contact but is such that the two grooves 30, 31 overlap, as shown in Fig. 8. However for disengagement of the members using hydraulic fluid, the grooves 30, 31 must overlap when the members are fully engaged to ensure that fluid is communicated the full length of the parts of the surfaces provided with projections and grooves, as shown in Fig. 9.
During application of the pressurised fluid, the members 3, 4 are pulled together or may be pulled apart by a clamping arrangement, as for example, shown in Fig. 6 of Patent
Specification No. 1573945, which engages in circumferential grooves 23 and 24 or grooves 23 and 25, shown in broken lines in Fig. 7, or by a clamping device, eg. comprising slips, which engages the pipes above and below the members. Alternatively, if the pipes to be connected are oriented vertically, the engagement force may simply be provided by the weight of the upper pipe to be connected to the lower pipe which is relatively fixed.
As shown in Fig. 7, the members 3, 4 may in use be welded to the ends of two pipes 26, 27, or they may be made integral therewith or otherwise connected to the pipes.
To ensure that the pipe connector is disengageable, it may be provided with the feature of co-pending U.K. Application No. 8116889 or that of the co-pending U.K. Patent Application No. 8201250.
Claims (8)
1. A pipe connector comprising a tubular pin member hsaving a frusto-conical outer peripheral surface and a tubular box member for receiving and engageable with the pin member and having a frusto-conical inner peripheral surface which overlies the frustoconical surface of the pin member when the members are fully engaged together, wherein, to axially lock the members together, the frusto-conical surfaces of the members are provided with axially spaced apart inter-engageable annular projections and grooves, corresponding pairs of which are inter-engaged when the members are fully engaged together, the pairs of projections and grooves having differing axial extents and being arranged so that as members are brought into full engagement in all intermediate positions of the members, after the frusto-conical surfaces have been brought into initial surface contact, there is contact between the crests of at least some of the projections and surfaces between the grooves which are spaced apart along the length of the overlying parts of the surfaces, to prevent intermediate inter-engagement of projections and grooves before the members are fully engaged.
2. A connector as claimed in claim 1, wherein all the pairs of projections and grooves have differing extents.
3. A connector as claimed in claim 1, wherein some of the pairs of projections and grooves have a first axial extent and other of the pairs of projections and grooves have a second axial extent smaller than the first axial extent.
4. A connector as claimed in any one of the preceding claims, wherein the spacing between adjacent pairs of projections and grooves varies along the length of the members.
5. A connector as claimed in claim 4, wherein the spacing between some adjacent pairs of grooves and projections has a first axial extent smaller than the first axial extent.
6. A connector as claimed in any one of the preceding claims, wherein the projections and grooves have a constant radial depth along the length of the surfaces such that the crest surfaces of the projections, the surfaces between the projections, the root surfaces of the grooves, and the surfaces between the grooves, all lie on frusto-conical surfaces having substantially the same angles of conicity.
7. A connector as claimed in any one of the preceding claims, wherein the box member is provided with a radial duct for inlet of fluid under pressure, which duct opens into an axially extending groove in the frustoconical surface thereof, the axially extending groove extending from the duct towards the free end of the box member, and the pin member is provided with an axially extending groove in the frusto-conical surface thereof extending towards the free end of the pin member, the axially extending grooves in the surfaces of the box and pin members extending to points intermediate the ends of the surfaces which are such that, when the members are fully engaged together, the axially extending grooves overlap, and when the members are brought into initial surface contact, the axially extending grooves extend no further than the initially overlying portions of the surfaces thereof.
8. A pipe connector substantially as herein described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08300257A GB2113335B (en) | 1982-01-18 | 1983-01-06 | Improvements in and relating to pipe connectors |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8201249 | 1982-01-18 | ||
| GB08300257A GB2113335B (en) | 1982-01-18 | 1983-01-06 | Improvements in and relating to pipe connectors |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8300257D0 GB8300257D0 (en) | 1983-02-09 |
| GB2113335A true GB2113335A (en) | 1983-08-03 |
| GB2113335B GB2113335B (en) | 1985-01-16 |
Family
ID=26281736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08300257A Expired GB2113335B (en) | 1982-01-18 | 1983-01-06 | Improvements in and relating to pipe connectors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2113335B (en) |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2544049A1 (en) * | 1983-04-05 | 1984-10-12 | Hunting Oilfield Services Ltd | FITTING FOR PIPING |
| GB2148439A (en) * | 1983-10-19 | 1985-05-30 | Vetco Offshore Ind Inc | Pipe connector |
| US4525001A (en) * | 1982-01-18 | 1985-06-25 | Hunting Oilfield Services (Uk) Limited | Pipe connector with interengagable tubular pin and tubular box members |
| WO1995031669A1 (en) * | 1994-05-13 | 1995-11-23 | Subsea Offshore Limited | A method of laying a pipeline |
| EP0803637A2 (en) * | 1996-04-26 | 1997-10-29 | Oil States Industries (UK) Ltd. | Pipe connector device with pin and box members having corresponding frusto-conical surfaces |
| US5964486A (en) * | 1997-03-24 | 1999-10-12 | Oil States Industries (Uk) Limited | Pipe connectors |
| US6056324A (en) * | 1998-05-12 | 2000-05-02 | Dril-Quip, Inc. | Threaded connector |
| WO2002012773A1 (en) | 2000-08-08 | 2002-02-14 | Oil States Industries (Uk) Ltd | Pipe assembly |
| US6481760B1 (en) * | 1998-09-07 | 2002-11-19 | Vallourec Mannesmann Oil & Gas France | Threaded connection of two metal tubes with groove in the threading |
| WO2011128658A1 (en) | 2010-04-15 | 2011-10-20 | Oil States Industries (U.K.) Limited | Pipe connector device |
| US8056940B2 (en) | 2008-06-27 | 2011-11-15 | Oil States Industries (Uk) Ltd. | Pipe connector device |
| WO2014184681A2 (en) | 2013-05-03 | 2014-11-20 | Oil States Industries (Uk) Ltd. | Merlin drilling riser assembly |
| WO2016005160A1 (en) * | 2014-07-07 | 2016-01-14 | Statoil Petroleum As | Mechanism for coupling tubulars |
| 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 |
| US11156313B2 (en) | 2015-04-16 | 2021-10-26 | Krzysztof Jan Wajnikonis | Mechanical connectors |
| US11434699B2 (en) | 2015-04-16 | 2022-09-06 | Krzysztof Jan Wajnikonis | Mechanical connector of long torsional and bending fatigue life |
| US11781682B2 (en) | 2015-04-16 | 2023-10-10 | Krzysztof Jan Wajnikonis | Enhancements of mechanical connector technology |
| US11906079B2 (en) | 2015-04-16 | 2024-02-20 | Krzysztof Jan Wajnikonis | Telescopically assembled mechanical connector |
-
1983
- 1983-01-06 GB GB08300257A patent/GB2113335B/en not_active Expired
Cited By (36)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4525001A (en) * | 1982-01-18 | 1985-06-25 | Hunting Oilfield Services (Uk) Limited | Pipe connector with interengagable tubular pin and tubular box members |
| FR2544049A1 (en) * | 1983-04-05 | 1984-10-12 | Hunting Oilfield Services Ltd | FITTING FOR PIPING |
| GB2148439A (en) * | 1983-10-19 | 1985-05-30 | Vetco Offshore Ind Inc | Pipe connector |
| FR2560345A1 (en) * | 1983-10-19 | 1985-08-30 | Vetco Offshore Ind Inc | AUTOMATIC CONNECTOR FOR TUBES |
| US4601491A (en) * | 1983-10-19 | 1986-07-22 | Vetco Offshore, Inc. | Pipe connector |
| AU574728B2 (en) * | 1983-10-19 | 1988-07-14 | Vetco Offshore Industries Inc. | Pipe connector |
| GB2302381B (en) * | 1994-05-13 | 1998-05-13 | Subsea Offshore Ltd | A method of laying a pipeline and of coupling a pipeline to a structure |
| WO1995031669A1 (en) * | 1994-05-13 | 1995-11-23 | Subsea Offshore Limited | A method of laying a pipeline |
| EP0803637A2 (en) * | 1996-04-26 | 1997-10-29 | Oil States Industries (UK) Ltd. | Pipe connector device with pin and box members having corresponding frusto-conical surfaces |
| US5954374A (en) * | 1996-04-26 | 1999-09-21 | Oil States Industries (Uk) Ltd. | Pipe connectors |
| EP0803637A3 (en) * | 1996-04-26 | 1999-09-22 | Oil States Industries (UK) Ltd. | Pipe connector device with pin and box members having corresponding frusto-conical surfaces |
| US5964486A (en) * | 1997-03-24 | 1999-10-12 | Oil States Industries (Uk) Limited | Pipe connectors |
| US6056324A (en) * | 1998-05-12 | 2000-05-02 | Dril-Quip, Inc. | Threaded connector |
| US6481760B1 (en) * | 1998-09-07 | 2002-11-19 | Vallourec Mannesmann Oil & Gas France | Threaded connection of two metal tubes with groove in the threading |
| WO2002012773A1 (en) | 2000-08-08 | 2002-02-14 | Oil States Industries (Uk) Ltd | Pipe assembly |
| US8056940B2 (en) | 2008-06-27 | 2011-11-15 | Oil States Industries (Uk) Ltd. | Pipe connector device |
| WO2011128658A1 (en) | 2010-04-15 | 2011-10-20 | Oil States Industries (U.K.) Limited | Pipe connector device |
| US9121229B2 (en) | 2013-05-03 | 2015-09-01 | Oil States Industries (Uk) Ltd. | Merlin drilling riser assembly |
| CN105164362A (en) * | 2013-05-03 | 2015-12-16 | 石油工业（英国）有限公司 | Merlin drilling riser assembly |
| EP3569811A1 (en) | 2013-05-03 | 2019-11-20 | Oil States Industries (UK) Ltd | Merlin single drilling riser assembly |
| WO2014184681A2 (en) | 2013-05-03 | 2014-11-20 | Oil States Industries (Uk) Ltd. | Merlin drilling riser assembly |
| WO2016005160A1 (en) * | 2014-07-07 | 2016-01-14 | Statoil Petroleum As | Mechanism for coupling tubulars |
| US11739595B2 (en) | 2015-04-16 | 2023-08-29 | Krzysztof Jan Wajnikonis | Mechanical connector utilizing shear pins to transfer torque |
| US11906079B2 (en) | 2015-04-16 | 2024-02-20 | Krzysztof Jan Wajnikonis | Telescopically assembled mechanical connector |
| US11905767B2 (en) | 2015-04-16 | 2024-02-20 | Krzysztof Jan Wajnikonis | Mechanical connector utilizing dog-clutch teeth to transfer torque |
| US11821267B2 (en) | 2015-04-16 | 2023-11-21 | Krzysztof Jan Wajnikonis | Mechanical connector utilizing interlocked threads to transfer torque |
| US11781682B2 (en) | 2015-04-16 | 2023-10-10 | Krzysztof Jan Wajnikonis | Enhancements of mechanical connector technology |
| US11156313B2 (en) | 2015-04-16 | 2021-10-26 | Krzysztof Jan Wajnikonis | Mechanical connectors |
| US11434699B2 (en) | 2015-04-16 | 2022-09-06 | Krzysztof Jan Wajnikonis | Mechanical connector of long torsional and bending fatigue life |
| US11613937B2 (en) | 2015-04-16 | 2023-03-28 | Krzysztof Jan Wajnikonis | Mechanical connector utilizing keys to transfer torque |
| US11015399B2 (en) | 2017-01-31 | 2021-05-25 | Torsion Tool Company As | Coupling assembly for elongate elements |
| US11624245B2 (en) | 2017-01-31 | 2023-04-11 | Torsion Tool Company As | Coupling assembly for elongate elements |
| EP3822449A1 (en) | 2017-01-31 | 2021-05-19 | Torsion Tool Company AS | A coupling |
| NO344834B1 (en) * | 2017-01-31 | 2020-05-18 | Torsion Tool Company As | A coupling |
| WO2018143819A1 (en) | 2017-01-31 | 2018-08-09 | Torsion Tool Company As | A coupling |
| NO20180062A1 (en) * | 2017-01-31 | 2018-08-01 | Torsion Tool Company As | A coupling |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8300257D0 (en) | 1983-02-09 |
| GB2113335B (en) | 1985-01-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 20030105 |