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EP-4735724-A1 - DOWNHOLE WIRELINE TOOL

EP4735724A1EP 4735724 A1EP4735724 A1EP 4735724A1EP-4735724-A1

Abstract

The present invention relates to a downhole wireline tool for performing an operation downhole in a well tubular metal structure in a well containing well fluid, the downhole wireline tool having an axial extension and a front face facing away from a top of the well, and the downhole wireline tool comprising a wireline connection unit for connection to a wireline, an electric motor powered by the wireline for rotating a rotatable shaft at a first rotational speed, an operational tool part for performing the operation by means of electricity and/or hydraulic fluid, and a pericyclic gear arranged between the electric motor and the operational tool part, the pericyclic gear being driven by the rotatable shaft of the electric motor for rotation of the operational tool part by an output rotatable shaft at a second rotational speed, wherein the pericyclic gear has a channel through which an electric and/or a fluid line extends to provide electricity and/or fluid power for operating the operational tool part. The invention also relates to a downhole system comprising the downhole wireline tool and a driving unit, such as a downhole tractor, for propelling the downhole system forward in the well.

Inventors

  • ANDERSEN, TOMAS SUNE

Assignees

  • Welltec A/S

Dates

Publication Date
20260506
Application Date
20240628

Claims (15)

  1. 1. A downhole wireline tool (1) for performing an operation downhole in a well tubular metal structure in a well containing well fluid, the downhole wireline tool having an axial extension (2) and a front face (3) facing away from a top of the well, and the downhole wireline tool comprising: - a wireline connection unit (4) for connection to a wireline (5), - an electric motor (6) powered by the wireline for rotating a rotatable shaft (7) at a first rotational speed, - an operational tool part (10) for performing the operation by means of electricity and/or hydraulic fluid, and - a pericyclic gear (8) arranged between the electric motor and the operational tool part, the pericyclic gear being driven by the rotatable shaft of the electric motor for rotation of the operational tool part by an output rotatable shaft (7') at a second rotational speed, wherein the pericyclic gear has a channel (9) through which an electric and/or a fluid line (11) extends to provide electricity and/or fluid power for operating the operational tool part.
  2. 2. A downhole wireline tool according to claim 1, wherein the pericyclic gear is a nutating pericyclic gear such as a wobbling or nutating bevel gear.
  3. 3. A downhole wireline tool according to claim 1 or 2, wherein the channel is provided by a through-bore in the rotatable shaft and the output rotatable shaft.
  4. 4. A downhole wireline tool according to any of the preceding claims, wherein the pericyclic gear is a reduction gear for reducing the rotational speed of the rotatable shaft.
  5. 5. A downhole wireline tool according to any of the preceding claims, wherein the pericyclic gear comprises a reaction control member (44) driven by the rotatable shaft, a pericyclic motion converter (45) driven by the reaction control member, and an output gear (46) driven by the pericyclic motion converter for driving an output rotatable shaft (7') connected to the operational tool part.
  6. 6. A downhole wireline tool according to any of the preceding claims, wherein the operational tool part comprises a drilling bit (16, 16a) or a machining bit (16, 16b).
  7. 7. A downhole wireline tool according to claim 6, wherein the operational tool part comprises a vibration-generating unit (12) for providing vibration force on the first drilling bit.
  8. 8. A downhole wireline tool according to any of the preceding claims, further comprising a driving unit (17) for driving the vibration-generating unit, the driving unit being powered by the line extending through the channel.
  9. 9. A downhole wireline tool according to any of the preceding claims, further comprising a pump unit (14) driven by the electric motor at a first rotational speed for providing fluid power in the form of pressurised fluid to the operational tool part through the line extending through the channel.
  10. 10. A downhole wireline tool according to claim 8 and 9, wherein the pump unit pumps fluid internally of the tool to provide pressurised fluid inside the channel and in part of the tool string to compensate for and provide an overpressure in the tool string so that well fluid cannot enter unintended parts of the tool string.
  11. 11. A downhole wireline tool according to any of the preceding claims, wherein both a fluid line (11, Ila) and an electric line (11, 11b) extend along and inside the channel.
  12. 12. A downhole wireline tool according to claim 9, wherein the operational tool part comprises at least one cutting arm (23) with at least one cutting element (24), the at least one cutting arm being projectable by means of the pressurised fluid for moving the cutting arm between a retracted position and a projected position, and the operational tool part being rotated by the output rotatable shaft for cutting in the well tubular metal structure.
  13. 13. A downhole wireline tool according to claim 9, wherein the pump unit comprises at least one pump inlet (15) in fluid communication with the well fluid for taking in well fluid from the well and ejecting the fluid again in the vicinity of the operational tool part.
  14. 14. A downhole wireline tool according to any of the preceding claims, wherein the pericyclic gear comprises bearings (47) arranged between the rotatable shaft and the reaction control member, the pericyclic motion converter and the output gear.
  15. 15. A downhole system (100) comprising the downhole wireline tool according to any of claims 1-14 and a driving unit, such as a downhole tractor, for propelling the downhole system forward in the well.

Description

DOWNHOLE WIRELINE TOOL Description The present invention relates to a downhole wireline tool for performing an operation downhole in a well tubular metal structure in a well containing well fluid, the downhole wireline tool having an axial extension and a front face facing away from a top of the well. The invention also relates to a downhole system comprising the downhole wireline tool and a driving unit, such as a downhole tractor, for propelling the downhole system forward in the well. In downhole wireline tools, power and space are limited, and therefore the function of the tools is also limited and dependent on design and smart ways to use the limited power efficiently to avoid any waste of power. However, the limited space down in the well necessitates a tool design using one electric motor for several purposes, and if those purposes require various rotational speeds, gears for increasing or decreasing the rotational speed of the output rotatable shaft of the motor are needed. Further, if pumping is required, only one pump for all purposes is used, and the hydraulic control and distribution section supply the pressurised fluid in the required state for all purposes. Using gears and hydraulic sections decreases the overall efficiency and limits the capability of the wireline tools. Also, the more complex the tool is, the more wear often occurs. Thus, the tool designer needs to find more efficient components to redesign the tool and/or to accumulate power in order for new wireline tools to be able to perform new and more demanding operations. It is an object of the present invention to wholly or partly overcome the above disadvantages and drawbacks of the prior art. More specifically, it is an object to provide an improved downhole wireline tool which is able to perform demanding intervention operations in wells without limiting tool efficiency, reducing tool wear resistance or substantially increasing the radial and axial dimensions of the tool. The above objects, together with numerous other objects, advantages and features, which will become evident from the below description, are accomplished by a solution in accordance with the present invention by a downhole wireline tool for performing an operation downhole in a well tubular metal structure in a well containing well fluid, the downhole wireline tool having an axial extension and a front face facing away from a top of the well, and the downhole wireline tool comprising: - a wireline connection unit for connection to a wireline, - an electric motor powered by the wireline for rotating a rotatable shaft at a first rotational speed, - an operational tool part for performing the operation by means of electricity and/or hydraulic fluid, and - a pericyclic gear arranged between the electric motor and the operational tool part, the pericyclic gear being driven by the rotatable shaft of the electric motor for rotation of the operational tool part by an output rotatable shaft at a second rotational speed, wherein the pericyclic gear has a channel through which an electric and/or a fluid line extends to provide electricity and/or fluid power for operating the operational tool part. Furthermore, the pericyclic gear may be a nutating pericyclic gear such as a wobbling or nutating bevel gear. In addition, the pericyclic gear may have a centre axis. Moreover, the centre axis may be coincident with a rotational centre axis of the electric motor. Further, the downhole wireline tool may have a centre tool axis. Also, the centre axis may be coincident with the centre tool axis. Furthermore, the channel may have a centre channel axis coincident with the centre axis of the pericyclic gear. In this way, the electric and/or fluid line is/are not twisted, and electricity and/or fluid power can be provided without any inefficient connections. In addition, the channel may be provided by a through-bore in the rotatable shaft and the output rotatable shaft. Moreover, the channel may extend along the axial extension. Further, the pericyclic gear may be a reduction gear for reducing the rotational speed of the rotatable shaft. Also, the reduction gear may be a wobbling or nutating bevel gear for reducing the rotational speed of the rotatable shaft with a reduction ratio of at least 1 : 10, preferably at least 1:50, more preferably at least 1 : 100, even more preferably at least 1 :200, and even more preferably at least 1: 1000. Furthermore, the pericyclic gear may comprise a reaction control member driven by the rotatable shaft, a pericyclic motion converter driven by the reaction control member and an output gear driven by the pericyclic motion converter for driving an output rotatable shaft connected to the operational tool part. Also, the reaction control member may be stationary and fixed to the housing of the tool. In addition, the operational tool part may comprise a drilling bit or a machining bit. Moreover, the machining bit may comprise inserts extending from the