EP0711377A1 - Jaw clamp for a mechanical or hydraulic rod lifter - Google Patents
Jaw clamp for a mechanical or hydraulic rod lifterInfo
- Publication number
- EP0711377A1 EP0711377A1 EP94926150A EP94926150A EP0711377A1 EP 0711377 A1 EP0711377 A1 EP 0711377A1 EP 94926150 A EP94926150 A EP 94926150A EP 94926150 A EP94926150 A EP 94926150A EP 0711377 A1 EP0711377 A1 EP 0711377A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wall
- clamping jaws
- jaw clamp
- housing
- clamp
- 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
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000013461 design Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241000239290 Araneae Species 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/10—Slips; Spiders ; Catching devices
-
- 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/02—Rod or cable suspensions
- E21B19/06—Elevators, i.e. rod- or tube-gripping devices
- E21B19/07—Slip-type elevators
Definitions
- the invention relates to a jaw clamp for a mechanical rod lifter of ram or drill rods, with a cylindrical housing with an inner wall tapering downwards, with a plurality of axially displaceable clamping jaws which are supported on the inner wall and which have a drill rod string axially penetrating the jaw clamp can clamp and are connected.
- Jaw clamps of this type are known for example from DE 89 04 040 Ul. They are used to grasp the rod during the pulling process when pulling the rod of a flat bore (examination hole, well drilling or the like). For this purpose, the clamping jaws rest with their inner lateral surface on the outer circumference of the drill pipe. The weight of the free-hanging rod pulls the jaws down along the conical inner wall of the housing, so that the wedge effect of the cone exerts a large radial force on the clamping jaws, which is sufficient to hold the rod strand.
- the clamping takes place as described by the lifting force of a mechanical or hydraulic device (rod lifter) acting from below on the housing.
- rod lifter When repositioning the rod lifter, the clamping jaws release from the drill pipe, slide down on the drill pipe and come into engagement with the drill pipe further down.
- the clamping jaws known from the prior art have on their outer side, which is supported on the conical inner wall of the housing, bearing devices for supporting balls which are intended to provide support.
- each individual clamping jaw is spherical on its outside in the area of the support on the conical inner wall.
- the invention makes use of the finding that the properties of the balls, which are inherently automatic for the person skilled in the art and are obviously deemed necessary in DE 89 04 040 U1, namely being able to unroll, are not at all possible for the intended use .
- the spherical shape can therefore perform the tasks in the jaw clamp very much better, since the one-piece design with the main part of the clamping jaw already gives it much greater stability, but the spherical shape with larger radii leads to a larger elliptical pattern of the clamping jaws on the inner wall.
- the variability and compensability of different drill pipe diameters is given by corresponding axial displaceability within the housing.
- the spherical shape allows a much larger rounding diameter to be achieved than is the case with separate support balls.
- the jaw clamp known from the prior art creates the connection of the clamping jaws present in it by means of a common guide device which is formed by an annular plate. This plate is placed on the clamping jaws from above and the clamping jaws can be displaced radially relative to the guide device by means of elongated bolt guides.
- the object of the invention is to find a simpler solution here.
- clamping jaws are movably connected to one another in such a way that they form a ring which is open on one side and has an annular gap which is variable in size.
- an articulated connection is made between two clamping jaws, the articulated connection being rotatable about axially parallel axes. It is particularly preferred if the articulated connection takes place via intermediate elements which are fastened to two adjacent clamping jaws so as to be rotatable about an axis parallel to the axis.
- DE 30 39 836 AI discloses a downhole spider pliers in which, in the case of an otherwise stationary housing, an element can be folded away laterally in order to be able to take out a drill rod laterally.
- this concept is not intended as a jaw clamp and would not be flexible enough or otherwise suitable for this.
- the Jaw clamp according to the invention makes it possible to raise the 'use with its preferably three clamping jaws out of the housing upwards, there unfold, so as to release the Ge Kirstrang held between the jaws and to take out the insert laterally. It can then be replaced by another application or serviced there.
- one or more, preferably two, of the axially parallel axes of rotation are provided with handles protruding from the housing.
- these handles are automatically connected to the clamping jaws and enable the insert with the clamping jaws to be removed in a particularly user-friendly manner.
- the handles can simply be inserted into the bores or other devices provided for the production of the axes.
- An embodiment is particularly preferred in which two handles are arranged on the two clamping jaws adjacent to the annular gap.
- An object of the invention over this disadvantage is to find a simpler solution here.
- the housing is provided on its upper side with a pivotable collar which, in the closed state, projects beyond the inside wall to such an extent that the interconnected clamping jaws in the housing cannot pass through the remaining opening.
- the collar can be loosened on one side by simply loosening the fastening screw and then pivoted away.
- the collar itself can also be used as a handle.
- An embodiment of a jaw clamp is particularly preferred which combines the crowning of each individual jaw with the annular gap which is variable in size and also has the collar which can be pivoted away.
- This embodiment has proven to be very suitable and versatile in tests.
- FIG. 1 shows an axially parallel, partially broken away section through a preferred embodiment of the invention
- FIG. 2 shows a schematic top view of FIG. 1.
- a cylindrical housing 10 has a conically tapering inner wall 11 at the top and bottom, it has openings 12 and 13, respectively.
- FIG. 1 An insert with three clamping jaws 20 is provided in the housing 10.
- Fig. 1 two of these clamping jaws are in section, in Fig. 2 all three are shown recognizable from above.
- Fig. 2 In the cylindrical housing they each occupy an angular range of slightly less than 120 °.
- the clamping jaws On their inside, the clamping jaws have a free space that leaves the axial region of the housing 10 free, and on the inside is provided with ripple openings 21 that increase the friction. These free spaces of the three clamping jaws 20 complement one another to form a common cylindrical surface, which is able to hold the drill string (not shown). This drill string line runs vertically through FIG. 1 in the axial region of the housing 10.
- the outside of the three clamping jaws 20 is spherical. This results in a support of this spherical outer surface 22 on the conically tapered inner wall 11 of the housing 10.
- the spherical design can take place in such a way that this support runs in a circular manner at the same height of the entire housing 10, but it can also be designed in this way be that, in a first approximation, only punctiform supports of the spherical outer wall 22 on the inner wall 11 result, for example in the form of a three-point bearing of the three interconnected clamping jaws 20 in the housing 10.
- the connection of the three clamping jaws to one another can best be seen in FIG. 2.
- the middle of the three clamping jaws 20 is arranged there in the lower third of the housing 20; the two further jaws 20 are connected on the left and right.
- Two intermediate elements 23 are connected in an articulated manner to the central clamping jaw 20, the joints being rotatable about axes parallel to the axis of the drill pipe or the housing 10.
- the intermediate elements 23 are connected at their respective other ends to the other two jaws so as to be rotatable about axes parallel thereto, so that a total of all three jaws are each pivotably connected to one another.
- handles 24 are also provided rigidly in the axis extension, on which the entire insert with the three jaws 20 can be raised and removed from the housing 10 .
- the entire insert can also be displaced vertically or axially parallel, and the clamping jaws 20 can also execute radial movements through the joints.
- a collar 30 is provided, in FIG. 2 in two parts. This collar 30 projects inward beyond the inner wall 11 of the housing 10, to the extent that it is able to retain the shape of the clamping jaws 20 as an insert in the housing 10. It therefore leaves an opening in area 12 free, which is smaller than the outer diameter of the three connected clamping jaws 20.
- the collar 30 is fastened to the housing 10 by means of a joint 31.
- the joint 31 allows a pivoting movement of the
- Collar 30 about an axis parallel to the axis of the housing 10.
- the collar is in two pieces; the two collar segments of the collar 30 can be pivoted about separate axes on the joints 31 and joined and held together by means of a magnet 32 on the side facing away from the joints.
- the collar is made in one piece and encloses between about 180 and 280 ° of the entire circumference of the upper region 12 of the housing 10.
- a joint 31 is provided, around which the collar 30 can be pivoted.
- this one-piece design results in a semi-ring-shaped element which, when swung open, can also be used as a carrying handle.
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)
- Earth Drilling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4326298 | 1993-08-05 | ||
DE4326298A DE4326298A1 (en) | 1993-08-05 | 1993-08-05 | Jaw clamp for a mechanical or hydraulic rod lifter |
PCT/EP1994/002594 WO1995004868A1 (en) | 1993-08-05 | 1994-08-05 | Jaw clamp for a mechanical or hydraulic rod lifter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0711377A1 true EP0711377A1 (en) | 1996-05-15 |
EP0711377B1 EP0711377B1 (en) | 1997-05-07 |
Family
ID=6494519
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94926150A Revoked EP0711377B1 (en) | 1993-08-05 | 1994-08-05 | Jaw clamp for a mechanical or hydraulic rod lifter |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0711377B1 (en) |
JP (1) | JPH09501210A (en) |
DE (2) | DE4326298A1 (en) |
WO (1) | WO1995004868A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19824945C2 (en) * | 1998-06-04 | 1999-08-19 | Zueblin Ag | Pipe catching device |
US6892835B2 (en) | 2002-07-29 | 2005-05-17 | Weatherford/Lamb, Inc. | Flush mounted spider |
GB2402945B (en) | 2003-06-16 | 2008-02-20 | Jeyes Group Ltd | A liquid dispensing device |
CA2702189C (en) | 2005-05-12 | 2012-10-23 | Weatherford/Lamb, Inc. | Equalized load distribution slips for spider and elevator |
EP2932016A4 (en) | 2012-12-11 | 2016-11-16 | Sandvik Intellectual Property | Rod handler improvements |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2085237A (en) * | 1936-05-23 | 1937-06-29 | Byron Jackson Co | Slip lock for elevators |
US3140523A (en) * | 1959-02-25 | 1964-07-14 | Byron Jackson Inc | Slip elevators |
US3422506A (en) * | 1967-12-26 | 1969-01-21 | Byron Jackson Inc | Convertible elevator |
US4244093A (en) * | 1979-03-19 | 1981-01-13 | Fred Klingensmith | Tubing slip pulling tool |
DE3039836A1 (en) * | 1980-10-22 | 1982-07-01 | Gray, Emma Dee, La Salle Parish, La. | Combined well casing spider and elevator - has bowl section with casing gripping slips and pivotable gate members |
DE8904040U1 (en) * | 1989-04-01 | 1989-08-03 | Röhrenwerk Kupferdreh Carl Hamm GmbH, 4300 Essen | Jaw clamp for a mechanical bar lifter |
US5335756A (en) * | 1992-12-22 | 1994-08-09 | Bilco Tools, Inc. | Slip-type gripping assembly |
-
1993
- 1993-08-05 DE DE4326298A patent/DE4326298A1/en not_active Withdrawn
-
1994
- 1994-08-05 DE DE59402672T patent/DE59402672D1/en not_active Revoked
- 1994-08-05 WO PCT/EP1994/002594 patent/WO1995004868A1/en not_active Application Discontinuation
- 1994-08-05 JP JP7506221A patent/JPH09501210A/en active Pending
- 1994-08-05 EP EP94926150A patent/EP0711377B1/en not_active Revoked
Non-Patent Citations (1)
Title |
---|
See references of WO9504868A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH09501210A (en) | 1997-02-04 |
WO1995004868A1 (en) | 1995-02-16 |
EP0711377B1 (en) | 1997-05-07 |
DE4326298A1 (en) | 1995-03-09 |
DE59402672D1 (en) | 1997-06-12 |
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