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
  • E21B31/00—Fishing for or freeing objects in boreholes or wells
  • E21B31/12—Grappling tools, e.g. tongs or grabs
  • E21B31/18—Grappling tools, e.g. tongs or grabs gripping externally, e.g. overshot

Definitions

• the present invention relates to a wellbore fishing tool with a novel design.
• a wire can be present in addition to the fish, typically together with the engagement interface of the fish.
• Such a wire may unintentionally be given slack, such that it falls over and lands partly on the side of the fish. This will add thickness, so that the fishing tool will require additional capability to engage the fish. Thus, conventional fishing tools may then not be able to engage the fish.
• An object of the present invention may be to provide a fishing tool that is able to engage a fish even where a wire is arranged together with the fish.
• a further object may be to enable release of the fishing tool from the fish after engaging it. Such functionality is typically advantageous if the fish is stuck in the well and the fishing tool is unable to pull the fish.
• Another object may be to provide a fishing tool that may also be used as a running tool for various other wellbore tools.
• an even further object may be to provide a fishing tool that can be engaged with a wellbore fish without requirement for axial force against the fish to actuate the engagement.
• a wellbore fishing tool configured for engaging and retrieving a fish in a subterranean well.
• the fishing tool comprises an actuation motor and an actuator member operated in an axial direction by the actuation motor. It further comprises an engagement assembly, wherein the engagement assembly comprises a main body, gripping elements configured to be moved between a non-engaged and an engaged state, and said actuation member between the actuator motor and the gripping elements.
• the gripping elements connect to the actuation member via a connection hinge.
• subterranean well is meant both onshore wells and subsea wells.
• the engagement assembly further comprises actuation links that connect to the actuation member with a first connection hinge and to the gripping element with a second connection hinge.
• the engagement assembly can have only two second inclined guide faces, wherein the said flat planes of which are symmetric about an axially extending center line.
• the second sliding faces also extend along respective flat planes. These planes of the respective second inclined guide faces and the respective second sliding faces can advantageously be parallel.
• the respective actuation links when in said non-engaged state, can be arranged at least partially inside the respective arm slots.
• the wellbore fishing tool discussed herein can be made without resilient springs, which are often used in prior solutions. Instead, solid components are used, which can be moved between the non-engaged and engaged state without relying on bending of the components.
• Fig. 1 is a perspective view of a portion of a wellbore fishing tool according to the invention
• Fig. 2 is a cross section side-view through the fishing tool of Fig. 1 ;
• Fig. 3 is a schematic illustration of a fish situated in a (not shown) well;
• Fig. 4, Fig. 5, and Fig. 6 are cross section side-views showing the movement from a non-engaged to an engaged state
• Fig. 7 and Fig. 9 are perspective views showing the non-engaged and the engaged state, respectively;
• Fig. 8 and Fig. 10 are front views corresponding to the situations shown in Fig. 7 and Fig. 9, respectively;
• FIG. 2 In the cross-section side-view of Fig. 2 there is shown an outer housing 11 , which in Fig. 1 has been omitted for illustrational purpose.
• the gripping surface 13a has a curved shape, as appears from the front view of Fig. 10.
• the front portion of the fishing tool 1 which is shown in Fig. 4, has a main body 17.
• the main body 17 has a front aperture 19, through which the fish 15 passes as the fish 15 is received in the fishing tool 1 .
• Fig. 5 shows the fishing tool 1 in a situation where the fish 15 has entered the fishing tool 1 .
• the fishing tool 1 comprises an abutment face 21 , against which the fish 15 abuts, as shown in Fig. 5.
• the actuation arms 23 extend parallel to the axial extension of the fishing tool 1 . Moreover, they are arranged within arm slots 25 of the main body 17.
• the gripping elements 13 are configured to be engaged with the fish 15.
• the gripping elements 13 may be forced somewhat into the material of the fish 15.
• the pulling gap 8a will ensure that the pulling force can still be transmitted through the main body 17 and not through the actuation arms 23.
• a pushing gap 8b which enables the pushing gap 8a to be provided when engaging the fish 15.
• FIG. 7 and Fig. 9 depict, with perspective views, the situations shown in Fig. 4 and Fig. 6, respectively.
• the fish 15 and the outer housing 11 have been omitted in Fig. 7 and Fig. 9.
• Fig. 8 and Fig. 10 illustrate the fishing tool 1 and the fish 15 with a front view, in the situations corresponding to Fig. 7 and Fig. 9. In Fig. 8, the damaged end portion of the fish 15 is illustrated.
• the landing face 34 is part of the main body 17.
• the gripping elements 13 When the gripping elements 13 have moved a maximum distance radially inwards, they collide with the respective landing faces 34, such that the movement is halted.
• the landing faces 34 extend axially, i.e. parallel to the longitudinal extension of the engagement assembly 10.
• the shown embodiment involves four landing faces 34, wherein the respective pairs of landing faces 34 each define a force-transmitting bar 36 between each landing face 34 of each pair.
• Fig. 11 and Fig. 12 depict the main body 17 with different perspective views for a better illustration of the first and second guide faces 33, 35, and the landing faces 34.
• the first inclined guide face 33 is interrupted by the arm slot 25.
• the actuation arms 23 and the actuation links 27 need merely be dimensioned for actuation of the gripping elements 13 from the non-engaged state into the engaged state.
• the front sleeve 41 has an inwardly facing, circular coned face 41 a that is flush with a circular coned face 17a of the main body 17.
• the main body 17 has a tubular or cylindrical shape with an inner bore 17b.
• Fig. 13 depicts a portion of the wellbore fishing tool 1 , without the engagement assembly 10.
• Fig. 14 shows the actuator element 7 with the actuator arms 23 connected to it.
• embodiments disclosed above each only includes two gripping elements 13, it shall be clear to the skilled reader that other embodiments may include more, such as three or four gripping elements 13.
• the two gripping elements 13 of the above embodiments are distributed 180 degrees apart.
• Embodiments involving three grippers 13 may advantageously be distributed 120 degrees apart, while embodiments with four grippers 13 may be distributed 90 degrees apart.
• Such angle distribution will, as the skilled person will appreciate, also apply to the respective inclined guide faces and sliding faces.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Geology (AREA)
• Mining & Mineral Resources (AREA)
• Marine Sciences & Fisheries (AREA)
• Physics & Mathematics (AREA)
• Environmental & Geological Engineering (AREA)
• Fluid Mechanics (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)

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• 2023
  • 2023-08-25 WO PCT/NO2023/060037 patent/WO2024043789A1/en not_active Ceased
  • 2023-08-25 CN CN202380059412.XA patent/CN119698513A/zh active Pending
  • 2023-08-25 AU AU2023329695A patent/AU2023329695A1/en active Pending
  • 2023-08-25 EP EP23777389.0A patent/EP4577720A1/de active Pending

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