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
  • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
• • 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
  • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
  • E21B23/06—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for setting packers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
  • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
  • F16H25/20—Screw mechanisms
  • F16H25/2056—Telescopic screws with at least three screw members in coaxial arrangement
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
  • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
  • F16H25/20—Screw mechanisms
  • F16H2025/2062—Arrangements for driving the actuator
  • F16H2025/2075—Coaxial drive motors

Definitions

• This invention relates to an actuator. More particularly, it relates to an actuator for use in petroleum activities, including a motor which, possibly via a gearing, drives a spindle, the spindle, when rotating, linearly displacing a displacement body.
• the operation in question has a first phase in which, for example, gnppers are brought, with the motor under insignificant load, from a retracted, passive position into an extended position, for example close to a pipe wall.
• a second phase the grippers are brought under considerable power to grip in the pipe. The same conditions apply also when the grippers are to be released and retracted.
• the motor should have had several rotational speeds or the gearing several transmission ratios.
• the invention has for its object to remedy or reduce at least one of the drawbacks of the prior art or at least provide a useful alternative to the prior art.
• an actuator for use in petroleum activities including a motor which, possibly via a gearing, drives a spindle, the spindle, when rotating, linearly displacing a displacement body, and the actuator being characterized by there being an intermediate member arranged between the spindle and the displacement body, a first threaded connection being arranged between the spindle and the intermediate member and a second threaded connection being arranged between the intermediate member and the displacement body, the first and second threaded connections having different pitches, and at least one of the first and second threaded connections having a brake.
• the threaded connection may consist of any suitable threaded connection and may be chosen differently for the first and second threaded connections.
• relevant threaded connections may be a usual V-thread connection, a trapezoidal-thread connection or a ball- or roller-screw connection, all with a single thread or parallel threads.
• the first and second threaded connections have parallel or approximately parallel centre axes. Often, it is appropriate to arrange the threaded connections concentrically.
• the braking may be used to determine which one of the first and second threaded connections is to be activated first, whereby the next threaded connection will be activated only when the braking torque is exceeded.
• the braking torque may be exceeded, for example, by the actuator encountering resistance or the threaded connection activated first hitting an end stop.
• the one of the first and second threaded connections that has the smaller pitch may have a brake.
• the threaded connection that has the larger pitch will be activated first so that, for example, taking up slack or a positioning phase may be carried out relatively quickly, whereas the threaded connection with the smaller pitch is activated only when a certain torque has been exceeded, for example when the actual work or activating operation is to be carried out.
• At least one of the first and second threaded connections may be provided with a torque-releasable coupling for the brake function to be performed. The releasing torque of the coupling may be adjustable.
• the coupling is typically rotatably connected to one of the components of a threaded connection and to the corresponding component of the same threaded connection via a releasable element, for example in the form of friction material or a claw coupling.
• the motor of the actuator is electrically operated, but a hydraulically operated motor may be used in special cases.
• the device according to the invention enables an adjustable transmission in which maximum displacing force is ensured over the entire stroke length of the actuator as well.
• Figure 1 shows schematically an actuator in accordance with the invention in its retraced starting position
• Figure 2 shows, on a somewhat smaller scale, the actuator in a first phase of the axial displacement
• Figure 3 shows the same as figure 2, but in a second phase of the displacement.
• the reference numeral 1 indicates an actuator which includes an electric motor 2 with a gearing 4, the motor 2 driving a threaded spindle 6 via the gearing 4.
• the threaded spindle 6 fits complementariiy in a threaded, through-going bore 8 in an intermediate member 10.
• the connection between the spindle 6 and the intermediate member 10 constitutes a first threaded connection 12.
• the intermediate member 10 is externally threaded and complementariiy fits an internally threaded displacement body 14.
• the connection between the intermediate member 10 and the displacement body 14 constitutes a second threaded connection 16, the displacement body 14 being prevented, for example by being connected to a plug or the like, not shown, from rotating with the intermediate body 10.
• the first threaded connection 12 has a smaller thread pitch than the second threaded connection 16.
• the intermediate member 10 From an end portion facing away from the motor 2, the intermediate member 10 has been bored, with a partially threaded bore 18 extending in to a shoulder 20.
• a braking sleeve 22, which is in the bore 18, is axially displaceable on the spindle 6 as it is in engagement in an axial groove 24 in the spindle 6 and thereby rotates together with the spindle 6.
• a friction disc 26 is placed between the braking sleeve 22 and the shoulder 20.
• the braking sleeve 22 is pressed against the friction disc 26 by means of a spring 28 which is clamped between the friction disc 26 and an adjustment sleeve 32 which is axially adjustable by means of threads 30.
• the motor 2 When, for example, a plug, not shown, connected to the displacement body 14 is to be set, the motor 2 is started. By the friction disc 26 being pressed against the intermediate member 10, the intermediate member 10 is prevented from rotating relative to the spindle 6.
• the second threaded connection 16 that has the larger thread pitch is thereby activated.
• the displacement body 14 is thereby moved relatively fast up to a position in which the displacement resistance increases so that the torque on the spindle 6 increases to above the set releasing torque of the coupling 34.
• the first threaded connection 12 which has a smaller pitch, is activated, whereby the displacement body 14 is moved at greater force than what was possible by means of the second threaded connection 16.
• the first threaded connection 12 is activated when there is a need for a relatively great release force, whereas the second threaded connection 16 with its relatively larger displacement speed takes over when it is no longer necessary to exert a great displacement force.

Landscapes

• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Mining & Mineral Resources (AREA)
• Geology (AREA)
• Fluid Mechanics (AREA)
• Environmental & Geological Engineering (AREA)
• Physics & Mathematics (AREA)
• General Engineering & Computer Science (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Mechanical Engineering (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
• Transmission Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (1)

Citations (4)

• 2012
  • 2012-09-07 NO NO20121010A patent/NO20121010A1/no not_active Application Discontinuation
• 2013
  • 2013-09-04 WO PCT/NO2013/050149 patent/WO2014038952A1/fr not_active Ceased

Patent Citations (4)

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