WO2009005362A2 - Clamp ram device - Google Patents

Clamp ram device Download PDF

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Publication number
WO2009005362A2
WO2009005362A2 PCT/NO2008/000230 NO2008000230W WO2009005362A2 WO 2009005362 A2 WO2009005362 A2 WO 2009005362A2 NO 2008000230 W NO2008000230 W NO 2008000230W WO 2009005362 A2 WO2009005362 A2 WO 2009005362A2
Authority
WO
WIPO (PCT)
Prior art keywords
ram
piston
housing
clamp
power tong
Prior art date
Application number
PCT/NO2008/000230
Other languages
French (fr)
Other versions
WO2009005362A3 (en
Inventor
Olav Olsen
Original Assignee
Aker Mh As
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Aker Mh As filed Critical Aker Mh As
Priority to EP08766940A priority Critical patent/EP2176508A2/en
Publication of WO2009005362A2 publication Critical patent/WO2009005362A2/en
Publication of WO2009005362A3 publication Critical patent/WO2009005362A3/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E21B19/16—Connecting or disconnecting pipe couplings or joints
    • E21B19/161—Connecting or disconnecting pipe couplings or joints using a wrench or a spinner adapted to engage a circular section of pipe
    • E21B19/164—Connecting or disconnecting pipe couplings or joints using a wrench or a spinner adapted to engage a circular section of pipe motor actuated

Definitions

  • This invention relates to a clamp ram device. More particularly it concerns a clamp ram for a power tong wherein the clamp ram comprises an in the power tong displaceable first ram housing, and where a piston rod coupled to an in the first ram housing positioned first piston extends from the first ram housing to a retainer in the power tong.
  • the retainer comprises a second ram housing, as a second piston positioned in the second ram housing is coupled to the piston rod.
  • Separate pressure boosters constitute a complicating component, which contributes to prolong the power tong gripping sequence .
  • the object of the invention is to remedy or reduce at least one of the prior art drawbacks.
  • a clamp ram in accordance with the invention for use in a power tong comprises an in the power tong displaceable first ram housing where a piston rod coupled to an in the first ram housing positioned first piston extends from the first ram housing and to a retainer in the power tong.
  • the clamp ram is characterised in that the retainer comprises a second ram housing, as a second piston positioned in the second ram housing is connected to the piston rod.
  • the first and second pistons are typically positioned in opposing end portions of the piston rod.
  • the first piston has a first working area that faces away from the second piston, and a first return area that faces the second piston.
  • the second piston has a second working area that faces away from the first piston and a return area that that faces the first piston.
  • the second working area is larger than the first working area.
  • working area is meant that area of the respective pistons which is pressurised when the clamp ram is positioned in its clamping position, while the return area means the area of the respective pistons being pressurised when the clamp rams are to be returned to their starting positions.
  • the first ram housing is arranged to be displaceable in guides in the power tong housing, typically between the upper and lower power tong housing plates.
  • the second ram housing is disconnectably connected to the housing of the power tong. Pressurised fluid is supplied to the clamp ram from a hydraulic power unit having the necessary valves, via channels in the second ram housing and in the piston rod.
  • the power tong comprises three clamp rams distributed around the power tong central axis, where the respective first ram housings are arranged to be synchronously displaceable by means of a rack and pinion transmission.
  • the clamp ram structure with a relatively small first working area, causes the gripping jaws to be displaced relatively quickly forward to grip the pipe to be gripped, whereafter pressurised fluid is supplied to the relatively large second working area, whereby a relatively large clamp force is set up against the pipe.
  • the device according to the invention is space saving at the same time as it in all essentials overcomes prior art deficiencies .
  • Fig. 1 shows a power tong provided with clamp rams according to the invention
  • Fig. 2 shows in grater detail a cross-section of a clamp ram in its starting position
  • Fig. 3 shows the same as fig. 2 but with the first ram housing of the first clamp ram in a forward position.
  • Fig. 4 shows the same as fig. 3 but with the piston rod somewhat displaced in a direction outward from the second ram housing;
  • Fig. 5 shows the power tong of fig. 1, but with the top plate removed, as the power tong clamp rams are in their retracted starting positions;
  • Fig. 6 shows the same as fig. 5, but with the clamp rams in a forward position.
  • the reference numeral 1 indicates a power tong comprising a power tong housing 2 and three clamp rams 4.
  • the power tong housing 2 arranged to be pivotable about a central axis 6, is assembled of an upper plate 8 and a lower plate 10 and a number of intermediate pieces 12. Other necessary components connected to the power tong 1 are not shown.
  • Each clamp ram see fig. 2, comprises a first ram housing 14 displaceable in a guide 16 in the power tong housing 2.
  • the first ram housing 14. is provided with a first ram boring 18 extending inwards from an end portion of the first ram housing 14 to a first ram bottom 20. In the end portion facing away from the ram boring 18, the first ram housing is provided with a gripping jaw 22.
  • a first piston 24 is sealingly and displaceably provided in the first ram boring 18.
  • a piston rod 26 extends out from the first piston 24 to a second piston 28.
  • the second piston 28 positioned in the opposing end portion of the piston rod 26 relative to the first piston 24, is sealingly and displaceably provided in a second ram boring 30 in a second ram housing 32.
  • the second ram boring 30 extends into a second ram bottom 34.
  • the second ram housing 32 is by means of a bolt connection 40 connected to one of the power tong housing 2 intermediate pieces 12.
  • the end area of the first piston 24 facing away from the second piston 28 constitutes a first working area 42.
  • a first working chamber 44 is defined by the first ram boring 18, the first ram bottom 20, and the first working area 42.
  • a first return chamber 48 is defined by the first ram boring 18, the first end gable 36, and the first return area 46.
  • the end area of the second piston 28 facing away from the first piston 24 constitutes a second working area 50.
  • a second working chamber 52 is defined by the second ram boring 30, the second ram bottom 34, and the second working area 50.
  • the end area of the second piston 28 facing the first piston 24 constitutes a second return area 54.
  • a second return chamber 56 is defined by the second ram boring 30, the second end gable 38, and the second return area 54.
  • a first fluid port 58 in the second ram housing 32 is connected to a first sliding pipe 60.
  • the first sliding pipe 60 is sealingly and displaceably arranged in a first channel 62 running through the piston rod 26 and leading into the first working chamber 44.
  • a second fluid port 64 in the second ram housing 32 leads into the second working chamber 52.
  • a third fluid port 66 in the second ram housing 32 is connected to a second sliding pipe 68.
  • the second sliding pipe 68 is sealingly and displaceably arranged in a second channel 70 running in the piston rod 26.
  • the channel 70 communicates with the first return chamber 48 and the second return chamber 56.
  • the three first ram housings 14 are in a per se known way synchronised by means of a rack and pinion arrangement 72, see figs. 5 and 6.
  • the first fluid port 58 is closed by means of a valve (not shown) .
  • Pressure fluid is conveyed in via the second fluid port 64 to the second working chamber 52.
  • the relatively large working area 50 of the second piston 28 causes the gripping jaw 22 to abut the pipe (not shown) with a relatively large force, see fig. 4.
  • the working chambers 44, 52 are drained while pressure fluid is supplied via the third fluid port 66, the second sliding pipe 68, and the second channel 70 to the first return chamber 46 and the second return chamber 56. Both the first ram housing 14, and the piston rod 26 are thereby brought to their respective pulled-back starting positions, see figs. 2 and 5.

Abstract

A clamp ram device (4) for a power tong (1), the clamp ram (4) comprising an in the power tong (1) displaceable first ram housing (14), and a piston rod (26) connected to an in the first ram housing (14) positioned first piston (24) ex-tending out from the first ram housing (14) and to a retainer in the power tong (1), and the retainer comprising a second ram housing (32), as an in the second ram hosing positioned second piston (28) is connected to the piston rod (26).

Description

CLAMP RAM DEVICE
This invention relates to a clamp ram device. More particularly it concerns a clamp ram for a power tong wherein the clamp ram comprises an in the power tong displaceable first ram housing, and where a piston rod coupled to an in the first ram housing positioned first piston extends from the first ram housing to a retainer in the power tong. The retainer comprises a second ram housing, as a second piston positioned in the second ram housing is coupled to the piston rod.
During connections and disconnections of pipe strings as is known, e.g. from petroleum exploitation, it is common to utilise so-called power tongs to connect lengths of pipes to and disconnect lengths of pipes from the pipe string. Most often a first power tong clamps the pipe string to hold the pipe string still, while a second pivotable power tong clamps the length of pipe to be connected to or disconnected from the pipe string.
Due to the distance between the clamp faces of the two power tongs, when the length of pipe is connected to the pipe string, it is a challenge to design a power tong having sufficient clamping power, as the available space for the clamp rams is limited. The power tong gripping jaws must also have a sufficient radial travel in the power tong to be able to grip pipes of the existing dimensions. Pursuant to prior art it is common to utilise separate pressure boosters to provide the necessary clamp power with the ram dimension possible to build into the power tong.
Separate pressure boosters constitute a complicating component, which contributes to prolong the power tong gripping sequence .
The object of the invention is to remedy or reduce at least one of the prior art drawbacks.
The object is achieved according to the invention by the features presented in the below description and in the following claims.
A clamp ram in accordance with the invention for use in a power tong comprises an in the power tong displaceable first ram housing where a piston rod coupled to an in the first ram housing positioned first piston extends from the first ram housing and to a retainer in the power tong. The clamp ram is characterised in that the retainer comprises a second ram housing, as a second piston positioned in the second ram housing is connected to the piston rod.
The first and second pistons are typically positioned in opposing end portions of the piston rod. The first piston has a first working area that faces away from the second piston, and a first return area that faces the second piston. Correspondingly the second piston has a second working area that faces away from the first piston and a return area that that faces the first piston. Preferably the second working area is larger than the first working area.
By working area is meant that area of the respective pistons which is pressurised when the clamp ram is positioned in its clamping position, while the return area means the area of the respective pistons being pressurised when the clamp rams are to be returned to their starting positions.
The first ram housing is arranged to be displaceable in guides in the power tong housing, typically between the upper and lower power tong housing plates. The second ram housing is disconnectably connected to the housing of the power tong. Pressurised fluid is supplied to the clamp ram from a hydraulic power unit having the necessary valves, via channels in the second ram housing and in the piston rod.
In a preferred embodiment the power tong comprises three clamp rams distributed around the power tong central axis, where the respective first ram housings are arranged to be synchronously displaceable by means of a rack and pinion transmission.
The clamp ram structure, with a relatively small first working area, causes the gripping jaws to be displaced relatively quickly forward to grip the pipe to be gripped, whereafter pressurised fluid is supplied to the relatively large second working area, whereby a relatively large clamp force is set up against the pipe.
The device according to the invention is space saving at the same time as it in all essentials overcomes prior art deficiencies .
In the following a non-limiting example of a preferred embodiment is described which is illustrated in the accompanying drawings, where:
Fig. 1 shows a power tong provided with clamp rams according to the invention; Fig. 2 shows in grater detail a cross-section of a clamp ram in its starting position;
Fig. 3 shows the same as fig. 2 but with the first ram housing of the first clamp ram in a forward position.
Fig. 4 shows the same as fig. 3 but with the piston rod somewhat displaced in a direction outward from the second ram housing;
Fig. 5 shows the power tong of fig. 1, but with the top plate removed, as the power tong clamp rams are in their retracted starting positions; and
Fig. 6 shows the same as fig. 5, but with the clamp rams in a forward position.
In the drawings, the reference numeral 1 indicates a power tong comprising a power tong housing 2 and three clamp rams 4.
The power tong housing 2 , arranged to be pivotable about a central axis 6, is assembled of an upper plate 8 and a lower plate 10 and a number of intermediate pieces 12. Other necessary components connected to the power tong 1 are not shown.
Each clamp ram 4, see fig. 2, comprises a first ram housing 14 displaceable in a guide 16 in the power tong housing 2. The first ram housing 14. is provided with a first ram boring 18 extending inwards from an end portion of the first ram housing 14 to a first ram bottom 20. In the end portion facing away from the ram boring 18, the first ram housing is provided with a gripping jaw 22.
A first piston 24 is sealingly and displaceably provided in the first ram boring 18. A piston rod 26 extends out from the first piston 24 to a second piston 28. The second piston 28 positioned in the opposing end portion of the piston rod 26 relative to the first piston 24, is sealingly and displaceably provided in a second ram boring 30 in a second ram housing 32. The second ram boring 30 extends into a second ram bottom 34.
A first end gable 36 in the first ram housing 14 and a second end gable 38 in the second ram housing 32 sealingly surrounds the piston rod 26.
The second ram housing 32 is by means of a bolt connection 40 connected to one of the power tong housing 2 intermediate pieces 12.
The end area of the first piston 24 facing away from the second piston 28 constitutes a first working area 42. A first working chamber 44 is defined by the first ram boring 18, the first ram bottom 20, and the first working area 42.
The end area of the first piston 24 facing the second piston 28 constitutes a first return area 46. A first return chamber 48 is defined by the first ram boring 18, the first end gable 36, and the first return area 46.
The end area of the second piston 28 facing away from the first piston 24 constitutes a second working area 50. A second working chamber 52 is defined by the second ram boring 30, the second ram bottom 34, and the second working area 50.
The end area of the second piston 28 facing the first piston 24 constitutes a second return area 54. A second return chamber 56 is defined by the second ram boring 30, the second end gable 38, and the second return area 54. A first fluid port 58 in the second ram housing 32 is connected to a first sliding pipe 60. The first sliding pipe 60 is sealingly and displaceably arranged in a first channel 62 running through the piston rod 26 and leading into the first working chamber 44.
A second fluid port 64 in the second ram housing 32 leads into the second working chamber 52.
A third fluid port 66 in the second ram housing 32 is connected to a second sliding pipe 68. The second sliding pipe 68 is sealingly and displaceably arranged in a second channel 70 running in the piston rod 26. The channel 70 communicates with the first return chamber 48 and the second return chamber 56.
Thus there are arranged separate supply channels to the first working chamber 44 and the second working chamber 52.
When the gripping jaw 22 of the first clamp ram 4 shall be brought to grip a pipe (not shown) , pressure fluid is supplied via the first port 58, the first sliding pipe 60, and the first channel 62 to the first working chamber 44. The first working area 42 is relatively small, whereby the first ram housing 14 is displaced forward against the pipe (not shown) with a relatively high speed. Fluid positioned in the first return chamber 48 is drained via the second channel 70, the second sliding pipe 68, and the third fluid port 66.
The three first ram housings 14 are in a per se known way synchronised by means of a rack and pinion arrangement 72, see figs. 5 and 6.
When the gripping jaw 22 has reached abutment with and clamps the pipe (not shown), see figs. 3 and 6, the first fluid port 58 is closed by means of a valve (not shown) . Pressure fluid is conveyed in via the second fluid port 64 to the second working chamber 52. The relatively large working area 50 of the second piston 28 causes the gripping jaw 22 to abut the pipe (not shown) with a relatively large force, see fig. 4.
When the first ram housing 14 is to be displaced to its starting position, the working chambers 44, 52 are drained while pressure fluid is supplied via the third fluid port 66, the second sliding pipe 68, and the second channel 70 to the first return chamber 46 and the second return chamber 56. Both the first ram housing 14, and the piston rod 26 are thereby brought to their respective pulled-back starting positions, see figs. 2 and 5.

Claims

C L A I M S
1. A clamp ram device (4) for a power tong (1), the clamp ram (4) comprising an in the power tong (1) displaceable first ram housing (14) , and where a piston rod (26) which is connected to an in the first ram housing (14) positioned first piston (24) , extends out from the first ram housing (14) and to a retainer in the power tong (1), c h a r a c t e r i s e d i n that the retainer comprises a second ram housing (32) , as an in the second ram housing (32) positioned second piston (28) is connected to the piston rod (26) .
2. A clamp ram device in accordance with claim 1, c h a r a c t e r i s e d i n that the first piston (24) and the second piston (28) are positioned in either end portion of the piston rod (26) .
3. A clamp ram device in accordance with claim 1, c ha r a c t e r i s e d i n that a second working area (50) appurtenant the second piston (28) is larger than a first working area appurtenant the first piston (24) .
4. A clamp ram device in accordance with claim 1, c h a r a c t e r i s e d i n that the first ram housing (14) is arranged to be displaceable in a guide
(16) in the power tong housing (2) .
5. A clamp ram device in accordance with claim 1, c h a r a c t e r i s e d i n that separate supply- channels communicate with a first working chamber (44) and a second working chamber (52) .
PCT/NO2008/000230 2007-07-03 2008-06-23 Clamp ram device WO2009005362A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08766940A EP2176508A2 (en) 2007-07-03 2008-06-23 Clamp ram device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20073411A NO330889B1 (en) 2007-07-03 2007-07-03 Clamp cylinder assembly
NO20073411 2007-07-03

Publications (2)

Publication Number Publication Date
WO2009005362A2 true WO2009005362A2 (en) 2009-01-08
WO2009005362A3 WO2009005362A3 (en) 2009-11-05

Family

ID=40226685

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2008/000230 WO2009005362A2 (en) 2007-07-03 2008-06-23 Clamp ram device

Country Status (3)

Country Link
EP (1) EP2176508A2 (en)
NO (1) NO330889B1 (en)
WO (1) WO2009005362A2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070068669A1 (en) * 2005-09-23 2007-03-29 Gerald Lesko Pipe gripping ram

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2346576B (en) * 1999-01-28 2003-08-13 Weatherford Lamb A rotary and a method for facilitating the connection of pipes
US7013759B1 (en) * 2005-08-31 2006-03-21 Access Oil Tools, Inc. Apparatus for handling tubulars and method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070068669A1 (en) * 2005-09-23 2007-03-29 Gerald Lesko Pipe gripping ram

Also Published As

Publication number Publication date
WO2009005362A3 (en) 2009-11-05
NO20073411L (en) 2009-01-05
NO330889B1 (en) 2011-08-08
EP2176508A2 (en) 2010-04-21

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