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
  • E21B19/02—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 operable by a flowing medium mm holding and / or lowering or Lifting a pipe string with which a borehole for supporting the rock and mm manufacture 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 for screwing with another pipe will apply.
• 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.
• the invention has for its object a safety switching system of the aforementioned Generic to protect the arranged within a tensioning device, no external is exposed to mechanical influences and excludes incorrect switching.
• the Invention to solve this problem is characterized in that the wedge holder A switching cam for a safety switching valve is attached to the tensioning device, which is attached to the base body 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 proper 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 can be driven over.
• 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 cannot occur due to external influences. Malfunctions are excluded with a high degree of certainty.
• the safety switch 1 is firmly 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 l "is measured according to the diameter differences 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 tensioning wedges of the tensioning device in the direction of the double arrow 9 and, when it is operatively connected to the feeler wheel 4, leaves them reach their switching position via surfaces 5 and 6.
• the safety switch is not shown in contact position with the switching cam 8 for reasons of better clarity.
• 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 feed 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.
• FIG. 2 shows part of the pipe string 13 with a pipe sleeve 24 inside the pipe open clamping wedges.
• the larger diameter of the pipe sleeve will set the Prevent tensioning wedges 12a and 12b up to their correct position.
• the switch cam 8 will therefore not reach because 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 quickly runs 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 positioned correctly, but is too small in diameter.
• FIG. 4 shows the pipe string in the prescribed clamping position within the Tensioner.
• 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 Tasrad 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 (FIG. 5), those for the desired automatic sequence of operations on a drilling rig with a holding device (spider) and a lowering and lifting device (elevator) 32 are contained.
• the corresponding connecting lines lead from the switch box to the safety valves 1 and 101 on the holding device 31 and to the lowering and lifting device (elevator) 32 and to the associated control cylinders 22 and 122, which are each located on the devices.
• the components of the entire security system are explained below in the volume of the individual process steps at the beginning of a robbery process.
• the lowering and lifting device are given the usual designation Elevator "and there holding device with the usual designation 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. Of 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 with the first two screwed pipes lower.
• the switch 42 is then 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.
• Valves 43 and 143 are safety valves that mutually connect that control cylinders 22 and 122 are actuated at the same time, and that the clamping wedges of spider and elevator can 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 accommodation of the first tubes in the spider and elevator.

Landscapes

• 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)
• Forklifts And Lifting Vehicles (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)
• Control And Safety Of Cranes (AREA)
• Maintenance And Inspection Apparatuses For Elevators (AREA)
• Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Priority Applications (8)

Applications Claiming Priority (1)

Publications (2)

Family

ID=8226955

Family Applications (1)

Country Status (8)

Cited By (3)

Families Citing this family (7)

Citations (5)

Family Cites Families (8)

• 1997
  • 1997-06-25 EP EP97110337A patent/EP0887510B1/fr not_active Expired - Lifetime
  • 1997-06-25 AT AT97110337T patent/ATE251269T1/de not_active IP Right Cessation
  • 1997-06-25 DE DE59710808T patent/DE59710808D1/de not_active Expired - Lifetime
• 1998
  • 1998-06-20 US US09/445,795 patent/US6386282B1/en not_active Expired - Lifetime
  • 1998-06-20 CA CA002293294A patent/CA2293294C/fr not_active Expired - Fee Related
  • 1998-06-20 WO PCT/EP1998/003779 patent/WO1999000577A1/fr not_active Ceased
  • 1998-06-20 AU AU84395/98A patent/AU730734B2/en not_active Ceased
• 1999
  • 1999-02-25 NO NO19990901A patent/NO312851B1/no not_active IP Right Cessation

Patent Citations (5)

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