EP0887510B1 - Safety switch system for slip-type elevators - Google Patents

Safety switch system for slip-type elevators Download PDF

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Publication number
EP0887510B1
EP0887510B1 EP97110337A EP97110337A EP0887510B1 EP 0887510 B1 EP0887510 B1 EP 0887510B1 EP 97110337 A EP97110337 A EP 97110337A EP 97110337 A EP97110337 A EP 97110337A EP 0887510 B1 EP0887510 B1 EP 0887510B1
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EP
European Patent Office
Prior art keywords
safety
clamping
valves
clamping device
safety switching
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.)
Expired - Lifetime
Application number
EP97110337A
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German (de)
French (fr)
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EP0887510A1 (en
Inventor
Manfred Jänsch
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.)
Weatherford Lamb Inc
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Weatherford Lamb Inc
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Filing date
Publication date
Priority to AT97110337T priority Critical patent/ATE251269T1/en
Application filed by Weatherford Lamb Inc filed Critical Weatherford Lamb Inc
Priority to DE59710808T priority patent/DE59710808D1/en
Priority to EP97110337A priority patent/EP0887510B1/en
Priority to CA002293294A priority patent/CA2293294C/en
Priority to PCT/EP1998/003779 priority patent/WO1999000577A1/en
Priority to AU84395/98A priority patent/AU730734B2/en
Priority to US09/445,795 priority patent/US6386282B1/en
Publication of EP0887510A1 publication Critical patent/EP0887510A1/en
Priority to NO19990901A priority patent/NO312851B1/en
Application granted granted Critical
Publication of EP0887510B1 publication Critical patent/EP0887510B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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 safety switching system for a equipped with clamping wedges and clamping device which can be actuated by a flowing medium for holding and / or lowering or Lifting a tubing string that is used to drill a hole to support the rock and to manufacture it a conveyor line is lined.
  • One of the Device is a holding device (spider), with which a pipe string with the help of clamping wedges is held for screwing with another pipe.
  • a holding device for automatic control of the setting according to US-PS 2,545,177 the wedges used when reaching the desired position of the pipe string.
  • a single pipe is first placed on a pipe string with a Auxiliary elevator that takes the pipe from a pipe store, places it on the pipe string and holds during the screwing process. After completing the screwing with The auxiliary elevator becomes the pipe string located below the attached pipe removed and replaced by the second tensioner, an elevator. This is in essentially identical to the holding device and is from above over the first Free-standing pipe, already screwed to the pipe string, pushed up until its clamping wedges reach the prescribed position on the pipe. Then his wedges set.
  • the invention has for its object a safety switching system of the aforementioned To create genus that is protected inside a tensioning device, no external is exposed to mechanical influences and excludes incorrect switching.
  • the Invention for solving this problem is characterized in that on the wedge holder A switching cam for a safety switching valve is attached to the tensioner arranged of the tensioning device and of the switching cam movable with the tensioning wedge holder can be actuated when the clamping wedges are in their correct clamping position on the pipe string take in.
  • the switching cam preferably has an ramp, a ramp and an intermediate vertical button located on and is from a contact wheel of the switching valve traversable.
  • the length of the button is determined by the diameter differences between the largest and the smallest of the pipes to be clamped correctly with the tensioning device.
  • the safety valve of one device is connected upstream of the control valve for actuating the working cylinder for clamping the wedges of the other device.
  • a short-circuit switch for bypassing the safety switch is provided for each clamping device. This switch is actuated in order to be able to initiate a tensioning process on the first pipe of a pipe string to be formed.
  • the individual components of the safety switching system are extraordinary Simplicity, standard training and housed within a tensioner, so that mechanical defects due to external influences cannot occur. switching errors are excluded with a high degree of certainty.
  • the safety switch 1 is fixedly connected with its housing 2 to a tensioning device and carries at the front end of a resilient holding arm 3 a feeler wheel 4 with which the surfaces 5, 6 and 7 of a switching cam 8 can be run over. Areas 5 and 7 are run-up areas for the feeler wheel, they go into button 6. Their length "1" is measured according to the difference in diameter between the largest and the smallest of the pipes to be clamped correctly with the tensioning device.
  • the cam 8 moves through its fixed connection with the clamping wedges of the tensioning device in the direction of the double arrow 9 and, when in active connection with the feeler wheel 4, allows them to reach their switching position via the surfaces 5 and 6. In the exemplary embodiment shown in FIG. 1, for reasons of better clarity, the safety switch is not shown in contact position with the switching cam 8.
  • a base body 10 with wedge surfaces 11 for example, two clamping wedges 12a and 12b are arranged such that they can be set vertically. Between these wedges there is an exciting section of a pipe string 13 to be grasped by setting the wedges.
  • the clamping wedges are fastened to wedge holders 14a and 14b and connected to an annular holding member 17 via force transmission lugs and connecting webs 16a, 16b.
  • the ring-shaped holding member is adjusted vertically via actuating units consisting of working cylinders and adjusting pistons 18a, 18b.
  • the actuators can be operated pneumatically as well as hydraulically. With 19, for example, a supply line for the work equipment is indicated. The supply is controlled via a working valve 20, the actuating lever 21 of which is mechanically connected to a control cylinder 22.
  • a protective cap 23 on the base body 10 largely closes off the entire device from the outside.
  • Figure 2 shows a part of the pipe string 13 with a pipe sleeve 24 within the still open clamping wedges.
  • the larger diameter of the pipe socket will set the Prevent tensioning wedges 12a and 12b up to their correct position.
  • the switch cam 8 will therefore not reach the touch wheel 4 of the safety switch 1. The same effect will adjust itself during a tensioning process with a pipe that is positioned correctly but is too large in diameter.
  • FIG. 1 A further incorrect position of the pipe string within a tensioning device is shown in FIG
  • the pipe string to be clamped has not reached the clamping wedges 12a and 12b.
  • the adjusting units 18a and 18b can therefore quickly the clamping wedges to the lower end of the Wedge surface 11 are lowered.
  • the switching cam 8 runs quickly past the feeler wheel 4, so that it is not an effective one to be triggered by the safety switch Switching process comes to the actuators of the second tensioning device, not shown Release releases. The same effect will be felt when clamping with a pipe adjust that is correctly positioned, but has a diameter that is too small.
  • FIG. 4 shows the pipe string in the prescribed clamping position within the Tensioning device.
  • the clamping wedges grip the pipe string below the connecting sleeve 24.
  • the Tensioning wedges can carry out the tensioning process with the help of the adjusting units 18a and 18b and assume their prescribed position within the clamping wedge surface 11.
  • With the Lowering of the clamping wedges 12a and 12b arrives on the holding member 14b of the clamping wedge Switch cam 8 in the area of the feeler wheel 4 and presses it against the housing 2 of the Safety switch.
  • the feeler wheel is in operative connection with the holding surface 6 of the Switch cam 8, which can not be moved further down, so that Touch wheel is constantly on the holding surface and the lock on the control cylinder of the not shown second picks up so that it can release the tubing.
  • a switch box 30 ( Figure 5) are those for the desired automatic process the operations on a drilling rig with a holding device (spider) and a sinker Elevator 32 included. They lead from the switch box corresponding connecting lines to the safety valves 1 and 101 on the holding device 31 and on the lowering and lifting device (elevator) 32 and the associated Control cylinders 22 and 122, which are each located on the devices.
  • the components of the entire security system should be based on the individual process steps Start of a bolting process are explained.
  • the lowering and Lifting device for the sake of simplicity with the usual designation "elevator” and the holding device provided with the usual name "Spider”.
  • the entire device is supplied with compressed air via the pressure source 40.
  • the spider can then be opened by pressing the actuating valve 42.
  • the Associated switching cam 8 leaves the switching position on the safety valve 1.
  • the work equipment to the actuating valve 142 is shut off and emptied.
  • the elevator can now move through the pipe string formed in the first position in the first two screwed pipes Lower.
  • the switch 42 is actuated again, as a result of which the control cylinder 22 is activated and the spider closes.
  • the safety switch 1 tensions again so that the elevator opens is released.
  • the valves 43 and 143 are safety valves which mutually prevent the control cylinders 22 and 122 from being actuated at the same time and the clamping wedges of the spider and the elevator being thereby able to be released simultaneously. Both valves can be shut off by shut-off valves 44 and 144 in order to be able to initiate a work process with the reception of the first tubes in the spider and elevator.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
  • Control And Safety Of Cranes (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)

Abstract

The invention relates to a safety switching system for a clamping device used for holding and/or lowering and raising a line of pipes (13) lining a borehole. Said safety switching system is mounted inside the clamping device, where it is protected from external mechanical influences. To this end, a shift cam (18) for a safety shift valve (1, 2) is fastened to the clamping wedge support (14a, 14b) of the clamping device. This valve is mounted on the base (10) of the clamping device, and cooperates with the shift cam when the clamping wedges (12a, 12b) adopt their prescribed clamping position on the line of pipes.

Description

Die Erfindung betrifft ein Sicherheitsschaltsystem für ein mit Spannkeilen ausgerüstetes und durch ein strömendes Medium betätigbares Spanngerät zum Halten und/oder Ablassen oder Heben eines Rohrstrangs, mit dem ein Bohrloch zur Stützung des Gesteins und zum Herstellen einer Förderleitung ausgekleidet wird.The invention relates to a safety switching system for a equipped with clamping wedges and clamping device which can be actuated by a flowing medium for holding and / or lowering or Lifting a tubing string that is used to drill a hole to support the rock and to manufacture it a conveyor line is lined.

Beim Herstellen und Ablassen eines Rohrstrangs in ein Bohrloch werden wechselweise die erheblichen Massenkräfte des Rohrstranges aufnehmende Spanngeräte verwendet. Eines der Geräte ist eine Haltevorrichtung (Spider), mit der ein Rohrstrang mit Hilfe von Spannkeilen zum Verschrauben mit einem weiteren Rohr gehalten wird. Für eine derartige Haltevorrichtung wird nach der US-PS 2,545,177 eine Vorrichtung zur automatischen Steuerung des Setzens der Spannkeile beim Erreichen der gewünschten Position des Rohrstrangs verwendet.When manufacturing and lowering a pipe string into a borehole, the considerable inertial forces of the pipe string absorbing tensioners used. One of the Device is a holding device (spider), with which a pipe string with the help of clamping wedges is held for screwing with another pipe. For such a holding device is a device for automatic control of the setting according to US-PS 2,545,177 the wedges used when reaching the desired position of the pipe string.

Das Aufsetzen eines einzelnen Rohres auf einen Rohrstrang geschieht zunächst mit einem Hilfselevator, der das Rohr von einem Rohrlager übernimmt, auf den Rohrstrang setzt und während des Verschraubungsvorganges hält. Nach der Beendigung der Verschraubung mit dem unterhalb des aufgesetzten Rohres befindlichen Rohrstrang wird der Hilfselevator abgenommen und durch das zweite Spanngerät, einen Elevator, ersetzt. Dieser ist im wesentlichen mit der Haltevorrichtung baugleich und wird von oben über das zunächst freistehende, mit dem Rohrstrang bereits verschraubte Rohr geschoben, bis seine Spannkeile die vorgeschriebene Position am Rohr erreichen. Anschließend werden seine Spannkeile gesetzt. A single pipe is first placed on a pipe string with a Auxiliary elevator that takes the pipe from a pipe store, places it on the pipe string and holds during the screwing process. After completing the screwing with The auxiliary elevator becomes the pipe string located below the attached pipe removed and replaced by the second tensioner, an elevator. This is in essentially identical to the holding device and is from above over the first Free-standing pipe, already screwed to the pipe string, pushed up until its clamping wedges reach the prescribed position on the pipe. Then his wedges set.

Das Erreichen der richtigen Position am Rohr ist in der Praxis schwierig. Der Elevator läßt eine genaue Beobachtung zur Bestimmung des richtigen Sitzes seiner Spannkeile nicht zu. Beispielsweise kann das Erfassen eines Teils einer Rohrmuffe zu einem Abrutschen bei der Übernahme der sehr hohen Massenkräfte und zu erheblichen Beschädigungen der Rohrmuffe führen, denn es ist zu beachten, daß der Elevator den gesamten Rohrstrang am oberen Ende eines aufgeschraubten Rohres zu halten und abzusenken hat, sobald die Haltevörrichtung (Spider) vom Rohrstrang gelöst wird. Dies wird erreicht, indem zunächst der Elevator den gesamten Rohrstrang etwas anhebt, um die Haltevorrichtung zu entlasten. Erst dann können deren Spannkeile, beispielsweise mit Hilfe von Preßluft, gelöst werden. Ferner soll verhindert werden, daß aufgrund eines Mißverständnisses die Haltevorrichtung (Spider) geöffnet wird, obwohl der Elevator noch nicht geschlossen ist und dadurch ein vom Spider gehaltenes Rohr oder sogar ein längerer Rohrstrang verlorengeht.In practice, reaching the correct position on the pipe is difficult. The elevator leaves one close observation to determine the correct fit of his wedges does not allow. For example, the detection of a part of a pipe sleeve can cause the pipe to slip Assumption of the very high mass forces and considerable damage to the pipe socket lead, because it should be noted that the elevator has the entire pipe string at the top a screwed pipe to hold and lower as soon as the holding device (Spider) is detached from the pipe string. This is achieved by first lifting the raises the entire pipe string slightly to relieve the holding device. Only then can you whose clamping wedges are loosened, for example with the help of compressed air. It is also said to prevent that the holding device (spider) is opened due to a misunderstanding, although the elevator is not yet closed and therefore a tube held by the spider or even a longer pipe string is lost.

Der Verlust eines Rohrstrangs durch ein fehlerhaftes Ansetzen des Elevators oder ein falsches Öffnen des Spiders ist mit hohen Kosten verbunden und daher unbedingt zu vermeiden. Deshalb wurde mit einer Sicherheitsvorrichtung nach der DE 42 27 645 C2 eine Möglichkeit geschaffen, die Spannkeile eines Elevators am Rohr zu setzen, sobald eine Rohrmuffe in den Bereich eines Tastschalters gelangt. Dieses Schaltgerät ist auf der Oberseite des Elevators angeordnet. Mechanische Einflüsse, die zu einem Defekt führen können, sind jedoch nicht auszuschließen und gefährden die notwendige hohe Schaltsicherheit.The loss of a pipe string due to an incorrectly positioned elevator or an incorrect one Opening the spider is costly and should therefore be avoided. Therefore, a safety device according to DE 42 27 645 C2 became an option created to place the clamping wedges of an elevator on the pipe as soon as a pipe sleeve in the Area of a pushbutton switch. This switchgear is on the top of the elevator arranged. However, mechanical influences that can lead to a defect are not exclude and endanger the necessary high switching reliability.

Der Erfindung liegt die Aufgabe zugrunde, ein Sicherheitsschaltsystem der eingangs genannten Gattung zu schaffen, das geschützt innerhalb eines Spanngerätes angeordnet, keinen äußeren mechanischen Einflüssen ausgesetzt ist und Fehlschaltungen mit Sicherheit ausschließt. Die Erfindung zur Lösung dieser Aufgabe zeichnet sich dadurch aus, daß am Spannkeilhalter des Spanngeräts ein Schaltnocken für ein Sicherheitsschaltventil befestigt ist, das am Grundkörper des Spanngerätes angeordnet und von dem mit dem Spannkeilhalter bewegbaren Schaltnocken betätigbar ist, wenn die Spannkeile ihre vorschriftsmäßige Klemmposition am Rohrstrang einnehmen.The invention has for its object a safety switching system of the aforementioned To create genus that is protected inside a tensioning device, no external is exposed to mechanical influences and excludes incorrect switching. The Invention for solving this problem is characterized in that on the wedge holder A switching cam for a safety switching valve is attached to the tensioner arranged of the tensioning device and of the switching cam movable with the tensioning wedge holder can be actuated when the clamping wedges are in their correct clamping position on the pipe string take in.

Vorzugsweise weist der Schaltnocken eine Auflauframpe, eine Ablauframpe und eine zwischen diesen befindliche vertikale Schaltfläche auf und ist von einem Kontaktrad des Schaltventils überfahrbar. The switching cam preferably has an ramp, a ramp and an intermediate vertical button located on and is from a contact wheel of the switching valve traversable.

Die Länge der Schaltfläche wird durch die Durchmesserunterschiede zwischen dem größten und dem kleinsten der mit dem Spanngerät vorschriftsmäßig zu klemmenden Rohre bestimmt.The length of the button is determined by the diameter differences between the largest and the smallest of the pipes to be clamped correctly with the tensioning device.

Für den Einsatz an einem Bohrturm unter Verwendung zweier wechselweise betätigbarer Spanngeräte (Spider und Elevator) ist vorgesehen, daß das Sicherheitsventil eines Gerätes dem Steuerventil für das Betätigen des Arbeitszylinders zum Spannen der Keile des anderen Geräts vorgeschaltet ist.
Zusätzlich ist für jedes Spanngerät ein Kurzschlußschalter zur Umgehung des Sicherheitsschalters vorgesehen. Dieser Schalter wird betätigt, um einen Spannvorgang bei dem ersten Rohr eines zu bildenden Rohrstranges einleiten zu können.For use on a drilling rig using two alternately actuated clamping devices (spider and elevator) it is provided that the safety valve of one device is connected upstream of the control valve for actuating the working cylinder for clamping the wedges of the other device.
In addition, a short-circuit switch for bypassing the safety switch is provided for each clamping device. This switch is actuated in order to be able to initiate a tensioning process on the first pipe of a pipe string to be formed.

Von weiterer großer sicherheitstechnischer Bedeutung ist der Einsatz von zusätzlichen Sicherheitsventilen, die wechselseitig ausschließen, daß die Steuerzylinder für das Öffnen und Schließen der Spanngeräte gleichzeitig wirksam werden und entsprechend ein gleichzeitiges Öffnen der beiden Spanngeräte, beispielsweise bei gleichzeitigem Fehlschalten, verhindern.The use of additional is of further great importance in terms of safety technology Safety valves that mutually exclude that the control cylinders for opening and Closing the clamping devices take effect simultaneously and accordingly a simultaneous Prevent opening of the two tensioning devices, for example in the event of a faulty switch.

Die einzelnen Baukomponenten des Sicherheitsschaltsystems sind von außerordentlicher Einfachheit, marktüblicher Ausbildung und innerhalb eines Spanngeräts untergebracht, so daß mechanische Defekte durch äußere Einwirkungen nicht auftreten können. Fehlschaltungen werden mit hoher Sicherheit ausgeschlossen.The individual components of the safety switching system are extraordinary Simplicity, standard training and housed within a tensioner, so that mechanical defects due to external influences cannot occur. switching errors are excluded with a high degree of certainty.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung schematisch dargestellt und nachstehend erläutert. Es zeigen:

Figur 1
eine schaubildliche Prinzipskizze des Sicherheitsschalters mit Schaltnocken,
Figur 2
einen Querschnitt durch ein Spanngerät vor dem Beginn eines Spannvorgangs,
Figur 3
das Spanngerät nach Figur 2 mit gesetzten Keilen bei fehlerhafter Rohrposition,
Figur 4
das Spanngerät nach den Figuren 2 oder 3 mit gesetzten Spannkeilen nach Erreichen der richtigen Rohrposition innerhalb des Gerätes und
Figur 5
den Schaltplan für ein pneumatisch betriebenes Sicherheitsschaltsystem.
In the drawing, an embodiment of the invention is shown schematically and explained below. Show it:
Figure 1
a schematic diagram of the safety switch with switch cams,
Figure 2
a cross section through a clamping device before the start of a clamping process,
Figure 3
2 the tensioning device according to FIG. 2 with wedges in place when the tube position is incorrect,
Figure 4
the tensioning device according to Figures 2 or 3 with set wedges after reaching the correct pipe position within the device and
Figure 5
the circuit diagram for a pneumatically operated safety switching system.

Der Sicherheitsschalter 1 ist mit seinem Gehäuse 2 fest mit einem Spanngerät verbunden und trägt am vorderen Ende eines federnden Haltearms 3 ein Tastrad 4, mit dem die Flächen 5, 6 und 7 eines Schaltnockens 8 überfahren werden können.
Die Flächen 5 und 7 sind Auflaufflächen für das Tastrad, sie gehen in die Schaltfläche 6 über. Deren Länge "1" bemißt sich nach den Durchmesserunterschieden zwischen dem größten und dem kleinsten der mit dem Spanngerät vorschriftsmäßig zu klemmenden Rohre. Der Nocken 8 bewegt sich durch seine feste Verbindung mit den Spannkeilen des Spanngeräts in Richtung des Doppelpfeiles 9 und läßt bei Wirkverbindung mit dem Tastrad 4 diese über die Flächen 5 und 6 in ihre Schaltposition gelangen.
Bei dem gezeigten Ausführungsbeispiel gemäß Figur 1 ist aus Gründen einer besseren Übersichtlichkeit der Sicherheitsschalter nicht in Kontaktposition mit dem Schaltnocken 8 dargestellt.The safety switch 1 is fixedly connected with its housing 2 to a tensioning device and carries at the front end of a resilient holding arm 3 a feeler wheel 4 with which the surfaces 5, 6 and 7 of a switching cam 8 can be run over.
Areas 5 and 7 are run-up areas for the feeler wheel, they go into button 6. Their length "1" is measured according to the difference in diameter between the largest and the smallest of the pipes to be clamped correctly with the tensioning device. The cam 8 moves through its fixed connection with the clamping wedges of the tensioning device in the direction of the double arrow 9 and, when in active connection with the feeler wheel 4, allows them to reach their switching position via the surfaces 5 and 6.
In the exemplary embodiment shown in FIG. 1, for reasons of better clarity, the safety switch is not shown in contact position with the switching cam 8.

Innerhalb eines Grundkörpers 10 mit Keilflächen 11 sind beispielsweise zwei Spannkeile 12a und 12b vertikal setzbar angeordnet. Zwischen diesen Keilen befindet sich ein durch Setzen der Keile zu erfassender und spannender Abschnitt eines Rohrstrangs 13.
Die Spannkeile sind an Keilhaltern 14a und 14b befestigt und über Kraftübertragungslaschen und Verbindungsstege 16a, 16b mit einem ringförmigen Halteglied 17 verbunden. Das ringförmige Halteglied wird über Stelleinheiten, bestehend aus Arbeitszylindern und Stellkolben 18a, 18b, vertikal verstellt. Die Stelleinheiten können sowohl pneumatisch als auch hydraulisch betätigt werden. Mit 19 ist beispielsweise eine Zuleitung für das Arbeitsmittel angedeutet. Die Zuführung wird über ein Arbeitsventil 20 gesteuert, dessen Betätigungshebel 21 mechanisch mit einem Steuerzylinder 22 verbunden ist. Eine Schutzkappe 23 auf dem Grundkörper 10 schließt die gesamte Einrichtung nach außen weitestgehend ab.Within a base body 10 with wedge surfaces 11, for example, two clamping wedges 12a and 12b are arranged such that they can be set vertically. Between these wedges there is an exciting section of a pipe string 13 to be grasped by setting the wedges.
The clamping wedges are fastened to wedge holders 14a and 14b and connected to an annular holding member 17 via force transmission lugs and connecting webs 16a, 16b. The ring-shaped holding member is adjusted vertically via actuating units consisting of working cylinders and adjusting pistons 18a, 18b. The actuators can be operated pneumatically as well as hydraulically. With 19, for example, a supply line for the work equipment is indicated. The supply is controlled via a working valve 20, the actuating lever 21 of which is mechanically connected to a control cylinder 22. A protective cap 23 on the base body 10 largely closes off the entire device from the outside.

Die Figur 2 zeigt einen Teil des Rohrstrangs 13 mit einer Rohrmuffe 24 innerhalb der noch geöffneten Spannkeile. Der größere Durchmesser der Rohrmuffe wird jedoch das Setzen der Spannkeile 12a und 12b bis in ihre vorschriftsmäßige Position verhindern. Der Schaltnocken 8 wird daher nicht das Tastrad 4 des Sicherheitsschalters 1 erreichen. Die gleiche Wirkung wird sich bei einem Spannvorgang mit einem Rohr einstellen, das zwar vorschriftsmäßig positioniert ist, aber einen zu großen Durchmesser aufweist. Figure 2 shows a part of the pipe string 13 with a pipe sleeve 24 within the still open clamping wedges. However, the larger diameter of the pipe socket will set the Prevent tensioning wedges 12a and 12b up to their correct position. The switch cam 8 will therefore not reach the touch wheel 4 of the safety switch 1. The same effect will adjust itself during a tensioning process with a pipe that is positioned correctly but is too large in diameter.

Eine weitere Fehlposition des Rohrstrangs innerhalb eines Spanngeräts zeigt die Figur 3. Der zu klemmende Rohrstrang hat die Spannkeile 12a und 12b nicht erreicht. Bei der Betätigung der Stelleinheiten 18a und 18b können die Spannkeile deshalb rasch bis an das untere Ende der Keilfläche 11 abgesenkt werden. Dadurch läuft der Schaltnocken 8 rasch am Tastrad 4 vorbei, so daß es nicht zu einem von dem Sicherheitsschalter auszulösenden, wirksamen Schaltvorgang kommt, der die Stelleinheiten des zweiten, nicht dargestellten Spanngeräts zum Lösen freigibt. Die gleiche Wirkung wird sich bei einem Spannvorgang mit einem Rohr einstellen, das zwar richtig positioniert ist, aber einen zu geringen Durchmesser hat.A further incorrect position of the pipe string within a tensioning device is shown in FIG The pipe string to be clamped has not reached the clamping wedges 12a and 12b. When actuated the adjusting units 18a and 18b can therefore quickly the clamping wedges to the lower end of the Wedge surface 11 are lowered. As a result, the switching cam 8 runs quickly past the feeler wheel 4, so that it is not an effective one to be triggered by the safety switch Switching process comes to the actuators of the second tensioning device, not shown Release releases. The same effect will be felt when clamping with a pipe adjust that is correctly positioned, but has a diameter that is too small.

Die Figur 4 zeigt den Rohrstrang in der vorgeschriebenen Klemmposition innerhalb des Spanngeräts. Die Spannkeile erfassen den Rohrstrang unterhalb der Verbindungsmuffe 24. Die Spannkeile können mit Hilfe der Stelleinheiten 18a und 18b den Spannvorgang durchführen und dabei ihre vorgeschriebene Position innerhalb der Spannkeilfläche 11 einnehmen. Mit dem Absenken der Spannkeile 12a und 12b gelangt der am Halteglied 14b des Spannkeils befestigte Schaltnocken 8 in den Bereich des Tastrades 4 und drückt dieses gegen das Gehäuse 2 des Sicherheitsschalters. Das Tastrad steht dabei in Wirkverbindung mit der Haltefläche 6 des Schaltnockens 8, wobei dieser nicht weiter nach unten bewegt werden kann, so daß das Tastrad ständig an der Haltefläche anliegt und die Sperre über den Steuerzylinder des nicht dargestellten zweiten Spanngeräts aufhebt, so daß dieses den Rohrstrang freigeben kann.Figure 4 shows the pipe string in the prescribed clamping position within the Tensioning device. The clamping wedges grip the pipe string below the connecting sleeve 24. The Tensioning wedges can carry out the tensioning process with the help of the adjusting units 18a and 18b and assume their prescribed position within the clamping wedge surface 11. With the Lowering of the clamping wedges 12a and 12b arrives on the holding member 14b of the clamping wedge Switch cam 8 in the area of the feeler wheel 4 and presses it against the housing 2 of the Safety switch. The feeler wheel is in operative connection with the holding surface 6 of the Switch cam 8, which can not be moved further down, so that Touch wheel is constantly on the holding surface and the lock on the control cylinder of the not shown second picks up so that it can release the tubing.

Innerhalb eines Schaltkastens 30 (Figur 5) sind die für den gewünschten automatischen Ablauf der Arbeitsvorgänge an einem Bohrturm mit einer Halteeinrichtung (Spider) und einer Senkund Hebevorrichtung (Elevator) 32 enthalten. Von dem Schaltkasten führen die entsprechenden Verbindungsleitungen zu den Sicherheitsventilen 1 und 101 am Haltegerät 31 und an der Senk- und Hebevorrichtung (Elevator) 32 sowie zu den zugehörigen Steuerzylindern 22 und 122, die sich jeweils an den Geräten befinden. Die Bauelemente des gesamten Sicherheitssystems sollen nachstehend anhand der einzelnen Verfahrensschritte mit Beginn eines Verschraubungsvorgangs erläutert werden. Dabei werden das Senk- und Hebegerät der Einfachheit halber mit der üblichen Bezeichnung "Elevator" und das Haltegerät mit der branchenüblichen Bezeichnung "Spider" versehen.Within a switch box 30 (Figure 5) are those for the desired automatic process the operations on a drilling rig with a holding device (spider) and a sinker Elevator 32 included. They lead from the switch box corresponding connecting lines to the safety valves 1 and 101 on the holding device 31 and on the lowering and lifting device (elevator) 32 and the associated Control cylinders 22 and 122, which are each located on the devices. The components of the entire security system should be based on the individual process steps Start of a bolting process are explained. The lowering and Lifting device for the sake of simplicity with the usual designation "elevator" and the holding device provided with the usual name "Spider".

Die gesamte Einrichtung wird über die Druckquelle 40 mit Druckluft versorgt. The entire device is supplied with compressed air via the pressure source 40.

Zunächst sind der Spider und der Elevator geschlossen. Das von Hand schließbare Sicherheits-Bypassventil 41 für den Spider 31 wird geöffnet. Das identische Sicherheits-Bypassventil 141 für den Elevator kann geschlossen bleiben. Daraufhin schaltet das Betätigungsventil 42 für den Spider. Dieser öffnet sich. Mit einem Hilfselevator kann ein Rohr in den Spider gefädelt werden. Über das Betätigungsventil 42 wird anschließend der Spider geschlossen, vorausgesetzt, der Schaltnocken erreicht und hält seine Schaltposition. Anschließend wird das Sicherheits-Bypassventil 41 ausgeschaltet und gesichert, wodurch das Sicherheitssystem über den Sicherheitsschalter 1 eingeschaltet ist.First the spider and the elevator are closed. The manually lockable safety bypass valve 41 for the spider 31 is opened. The identical safety bypass valve 141 for the elevator can remain closed. Then the actuating valve 42 switches for the Spider. This opens. A tube can be threaded into the spider using an auxiliary elevator become. The spider is then closed via the actuating valve 42, provided the switch cam reaches and maintains its switch position. Then that will Safety bypass valve 41 turned off and secured, causing the safety system over the safety switch 1 is switched on.

Auf das im Spider gehaltene Rohr wird ein weiteres Rohr mit dem Hilfselevator aufgesetzt und verschraubt. Anschließend kann der geöffnete Elevator über das aufgeschraubte Rohr geschoben werden. Durch Drücken des Betätigungsschalters 142 schließt der Elevator über den Steuerzylinder 122 und spannt das aufgeschraubte Rohr. Über den Schaltnocken wird der Sicherheitsschalter 101 am Elevator aktiviert. Dadurch wird der Weg des Arbeitsmittels zum Betätigungsventil 42 freigegeben.Another tube with the auxiliary elevator is placed on the tube held in the spider and screwed. Then the opened elevator can be screwed onto the pipe be pushed. Pressing the actuation switch 142 closes the elevator the control cylinder 122 and clamps the screwed tube. Over the switch cam the Safety switch 101 activated on the elevator. This turns the path of the work equipment into Actuating valve 42 released.

Anschließend kann der Spider durch Drücken des Betätigungsventils 42 geöffnet werden. Der zugehörige Schaltnocken 8 verläßt die Schaltposition am Sicherheitsventil 1. Das Arbeitsmittel zum Betätigungsventil 142 wird abgesperrt und entleert. Der Elevator kann jetzt den durch die beiden ersten verschraubten Rohre gebildeten Rohrstrang bis in die gewünschte Position absenken. Anschließend wird erneut der Schalter 42 betätigt, wodurch der Steuerzylinder 22 aktiviert wird und der Spider schließt. Nachdem der Schaltnocken seine vorschriftsmäßige Position erreicht hat, spannt erneut der Sicherheitsschalter 1, so daß der Elevator zum Öffnen freigegeben wird.The spider can then be opened by pressing the actuating valve 42. The Associated switching cam 8 leaves the switching position on the safety valve 1. The work equipment to the actuating valve 142 is shut off and emptied. The elevator can now move through the pipe string formed in the first position in the first two screwed pipes Lower. Then the switch 42 is actuated again, as a result of which the control cylinder 22 is activated and the spider closes. After the switch cam its proper Has reached position, the safety switch 1 tensions again so that the elevator opens is released.

Die Ventile 43 und 143 sind Sicherheitsventile, die wechselseitig verhindern, daß die Steuerzylinder 22 und 122 gleichzeitig betätigt und dadurch die Spannkeile von Spider und Elevator gleichzeitig gelöst werden können.
Beide Ventile können durch Absperrventile 44 und 144 abgesperrt werden, um einen Arbeitsvorgang mit der Aufnahme der ersten Rohre in Spider und Elevator einleiten zu können.The valves 43 and 143 are safety valves which mutually prevent the control cylinders 22 and 122 from being actuated at the same time and the clamping wedges of the spider and the elevator being thereby able to be released simultaneously.
Both valves can be shut off by shut-off valves 44 and 144 in order to be able to initiate a work process with the reception of the first tubes in the spider and elevator.

Claims (7)

  1. A safety switching system for use in a drilling rig, the system comprising two clamping devices each provided with clamping wedges (12a, 12b) and alternately operable by a flowing medium for holding and/or lowering or raising of a pipe string (13), with which a borehole is lined in order to support rock and to create a transport line, characterized in that each clamping device is provided with a safety switching valve and a control valve, whereby there is attached to a clamping wedge holder (14) of each clamping device a trip cam (8) for the safety switching valve (1) which is mounted at the basic body (10) of the clamping device and is actively connected to the trip cam when the clamping wedges assume their prescribed clamping position on the pipe string, whereby the safety switching valve (1) of a clamping device is placed upstream of the control valve for the actuating of the working cylinder for clamping the wedges of the other clamping device and vice versa.
  2. The safety switching system according to claim 1, characterized in that the trip cam (8) includes a run-on ramp, a run-off ramp and a switching surface (6) situated between them and can be traversed by a contact wheel (4) of the safety switching valve.
  3. The safety switching system according to claim 1 or claim 2, characterized in that the length "1" of the switching surface is determined by the difference in diameter between the largest and the smallest of the pipes which can be clamped by the clamping device.
  4. The safety switching system according to claim 1 or claim 2, characterized in that a bypass switching valve (41, 141) is provided for every clamping device to bypass the safety switch.
  5. The safety switching system according to any one of the preceding claims, characterized in that safety valves (43, 143) are placed upstream of the control cylinders (22, 122) for positioning the clamping wedges of the two clamping devices, in such a way that, upon actuation of the control cylinder of one clamping device, the control cylinder of the other device is blocked.
  6. The safety switching system according to claim 5, characterized in that shut-off valves (44, 144) are placed upstream of the safety valves (43, 143) for the switching off of the safety valves and the shut-off valves can be operated by the actuation of the bypass valves (41,141) for the bypassing of the safety switches.
  7. The safety switching system according to claims 5 and 6, characterized in that the safety valves (43, 143) and shut-off valves (44, 144) are provided with return springs for automatic repositioning after a relieving of pressure.
EP97110337A 1997-06-25 1997-06-25 Safety switch system for slip-type elevators Expired - Lifetime EP0887510B1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
DE59710808T DE59710808D1 (en) 1997-06-25 1997-06-25 Safety switching system for pipe clamping devices
EP97110337A EP0887510B1 (en) 1997-06-25 1997-06-25 Safety switch system for slip-type elevators
AT97110337T ATE251269T1 (en) 1997-06-25 1997-06-25 SAFETY SWITCHING SYSTEM FOR PIPE CLAMPING DEVICES
PCT/EP1998/003779 WO1999000577A1 (en) 1997-06-25 1998-06-20 Safety switching system for clamping devices for pipes
CA002293294A CA2293294C (en) 1997-06-25 1998-06-20 Safety switching system for clamping devices for pipes
AU84395/98A AU730734B2 (en) 1997-06-25 1998-06-20 Safety switching system for clamping devices for pipes
US09/445,795 US6386282B1 (en) 1997-06-25 1998-06-20 Safety switching system for clamping devices for pipes
NO19990901A NO312851B1 (en) 1997-06-25 1999-02-25 Safety switch device for a pipe clamping device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97110337A EP0887510B1 (en) 1997-06-25 1997-06-25 Safety switch system for slip-type elevators

Publications (2)

Publication Number Publication Date
EP0887510A1 EP0887510A1 (en) 1998-12-30
EP0887510B1 true EP0887510B1 (en) 2003-10-01

Family

ID=8226955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97110337A Expired - Lifetime EP0887510B1 (en) 1997-06-25 1997-06-25 Safety switch system for slip-type elevators

Country Status (8)

Country Link
US (1) US6386282B1 (en)
EP (1) EP0887510B1 (en)
AT (1) ATE251269T1 (en)
AU (1) AU730734B2 (en)
CA (1) CA2293294C (en)
DE (1) DE59710808D1 (en)
NO (1) NO312851B1 (en)
WO (1) WO1999000577A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2357530B (en) * 2000-11-04 2003-09-03 Weatherford Lamb Method and apparatus for gripping tubulars
GB2377233B (en) * 2000-11-04 2005-05-11 Weatherford Lamb Safety mechanism for tubular gripping apparatus
US6968895B2 (en) * 2003-09-09 2005-11-29 Frank's Casing Crew And Rental Tools Drilling rig elevator safety system
US20090272542A1 (en) * 2008-05-03 2009-11-05 Frank's Casing Crew And Rental Tools, Inc. Tubular Grip Interlock System
US8439121B2 (en) * 2009-11-16 2013-05-14 Tesco Corporation Hydraulic interlock system between casing gripper and spider
CA2791477C (en) * 2010-03-01 2017-11-28 Frank's International, Inc. Elevator grip assurance

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2410589A (en) * 1942-08-17 1946-11-05 August L Segelhorst Automatic slip mechanism
US2545177A (en) * 1949-08-26 1951-03-13 Standard Oil Dev Co Control for power-operated slips
US2700201A (en) * 1950-04-03 1955-01-25 United States Steel Corp Operating mechanism for rotary slips
US2829617A (en) * 1955-11-04 1958-04-08 Benjamin F Kelley Power slips with warning signal means
BE599599A (en) * 1960-01-29
US4595062A (en) * 1980-07-17 1986-06-17 Varco International, Inc. Well casing jack mechanism
US4479547A (en) * 1981-06-01 1984-10-30 Varco International, Inc. Well pipe jack
US4676312A (en) * 1986-12-04 1987-06-30 Donald E. Mosing Well casing grip assurance system
US5311937A (en) * 1992-07-08 1994-05-17 Raito Kogyo Co., Ltd. Extractor for an injection pipe
DE4227645C2 (en) * 1992-08-21 1996-10-17 Weatherford Lamb Safety device for a pipe elevator
US5340182A (en) 1992-09-04 1994-08-23 Varco International, Inc. Safety elevator
US5848647A (en) * 1996-11-13 1998-12-15 Frank's Casing Crew & Rental Tools, Inc. Pipe gripping apparatus
US5791410A (en) * 1997-01-17 1998-08-11 Frank's Casing Crew & Rental Tools, Inc. Apparatus and method for improved tubular grip assurance

Also Published As

Publication number Publication date
US6386282B1 (en) 2002-05-14
CA2293294A1 (en) 1999-01-07
NO990901D0 (en) 1999-02-25
ATE251269T1 (en) 2003-10-15
WO1999000577A1 (en) 1999-01-07
NO312851B1 (en) 2002-07-08
AU8439598A (en) 1999-01-19
AU730734B2 (en) 2001-03-15
DE59710808D1 (en) 2003-11-06
NO990901L (en) 1999-02-25
EP0887510A1 (en) 1998-12-30
CA2293294C (en) 2006-12-12

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