EP-4735725-A1 - DOWNHOLE WIRELINE TOOL

EP4735725A1EP 4735725 A1EP4735725 A1EP 4735725A1EP-4735725-A1

Abstract

The present invention relates to a downhole wireline tool for performing an operation on a rotatable component part mounted as part of a well tubular metal structure in a well, the downhole wireline tool having an axial extension and a front 5 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, and a gearing system driven by the electric motor, the gearing system comprising a first gearing part connected with the rotatable shaft and configured to rotate in a first direction, wherein the gearing system further comprises an intermediate gearing part rotated by the first gearing part and a second gearing part rotated by the intermediate gearing part to rotate in a second direction opposite the first direction. 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

BORG, Peder Løkke
ANDERSEN, TOMAS SUNE

Assignees

Welltec A/S

Dates

Publication Date: 20260506
Application Date: 20240628

Claims (15)

1. A downhole wireline tool (1) for performing an operation on a rotatable component part mounted as part of a well tubular metal structure in a well, 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), and - a gearing system (8) driven by the electric motor, the gearing system comprising a first gearing part (9) connected with the rotatable shaft and configured to rotate in a first direction (DI), wherein the gearing system further comprises an intermediate gearing part (10) rotated by the first gearing part and a second gearing part (11) rotated by the intermediate gearing part to rotate in a second direction (D2) opposite the first direction.
2. A downhole wireline tool according to claim 1, wherein the first gearing part is connected to a first output shaft (14) that is rotatable with the first gearing part in the first direction, and the second gearing part is connected to a second output shaft (15) that is hollow and rotatable with the second gearing part in the second direction, the first output shaft extending through the second output shaft.
3. A downhole wireline tool according to claim 2, further comprising a first machining bit (16) forming the front face and connected to and rotated by the first output shaft.
4. A downhole wireline tool according to claim 2 or 3, wherein the second output shaft is a hollow shaft rotating around the first output shaft.
5. A downhole wireline tool according to claim 2 or 3, wherein the second output shaft is connected to a gripping element or a second machining bit (17) forming the front face and connected to and rotated by the second output shaft.
6. A downhole wireline tool according to claim 4, wherein the first machining bit has a first outer diameter (OD1), and the second machining bit has a second inner diameter (ID2) that is larger than the first outer diameter.
7. A downhole wireline tool according to any of the preceding claims 3-6, wherein the first machining bit comprises inserts (18) extending from the front face along the axial extension.
8. A downhole wireline tool according to claim 5 or 6, wherein the second machining bit is a tubular second machining bit having a circumference and circumferenting the first machining bit.
9. A downhole wireline tool according to any of the preceding claims 3-8, wherein the second machining bit comprises inserts extending from the front face along the axial extension.
10. A downhole wireline tool according to claim 8 or 9, wherein the second machining bit comprises inserts distributed along the circumference.
11. A downhole wireline tool according to any of claims 7-10, wherein the inserts are abrasive inserts.
12. A downhole wireline tool according to any of the preceding claims 3-11, wherein the first machining bit has a first rotation axis (41), and the second machining bit has a second rotation axis (42), the first rotation axis being coincident with the second rotation axis.
13. A downhole wireline tool according to any of the preceding claims, further comprising a reduction gear (43), such as a pericyclic gear, a wobbling gear or a nutating bevel gear, for reducing the rotation of the rotatable shaft.
14. A downhole wireline tool according to any of the preceding claims, wherein the first machining bit (16) is a drill bit such as a pilot bit.
15. 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 on a rotatable component part mounted as part of a well tubular metal structure in a well, 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. During fracturing operations, balls with varying diameters are dropped down the well in order to be seated in a matching ball seat, and some balls are designed to release and others to dissolve after a predetermined period of time. When this operation fails, the balls need to be drilled out, which can be very troublesome as machining in a rotating object is not easy, and therefore several designs have been tried out. Also, when drilling out other objects such as a stuck plug rotating, part of the plug may hinder easy removal as a rotating object like the ball just rotates along with the rotating drilling bit seeking to drill out the ball or plug. 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 also able to drill out rotating objects in a completion, such as a ball in a ball seat or a rotatable part of a stuck plug, of a well in an easy, safe and quick manner. 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 on a rotatable component part mounted as part of a well tubular metal structure in a well, 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, and - a gearing system driven by the electric motor, the gearing system comprising a first gearing part connected with the rotatable shaft and configured to rotate in a first direction, wherein the gearing system further comprises an intermediate gearing part rotated by the first gearing part and a second gearing part rotated by the intermediate gearing part to rotate in a second direction opposite the first direction. By having a gearing system where the output of the gear is a first gearing part rotating in one direction and a second gearing part rotating in an opposite direction, the downhole wireline tool is able to mill out e.g. a ball in a ball seat even though the ball is able to rotate. Also, the first gearing part may be connected to a first output shaft rotatable with the first gearing part in the first direction, and the second gearing part may be connected to a second output shaft that is hollow and rotatable with the second gearing part in the second direction, the first output shaft extending through the second output shaft. Moreover, the downhole wireline tool may further comprise a first machining bit forming the front face and being connected to and rotated by the first output shaft. Furthermore, the second output shaft may be a hollow shaft rotating around the first output shaft. Thus, the second output shaft may comprise a fluid channel or a channel for an electric line. In addition, the second output shaft may be connected to a gripping element or a second machining bit forming the front face and being connected to and rotated by the second output shaft. Further, the first machining bit may be hollow. Also, the first machining bit may have a first outer diameter, and the second machining bit may have a second inner diameter that is larger than the first outer diameter. Furthermore, the first machining bit may be tubular, having a first inner diameter that is less than 10 mm smaller than the first outer diameter, preferably less than 7 mm, and more preferably less than 5 mm. In addition, the second machining bit may be tubular, having a second inner diameter that is less than 10 mm smaller than the second outer diameter, preferably less than 7 mm, and more preferably less than 5 mm. Moreover, the second inner diameter may be less than 5 mm larger than the first outer diameter. In addition, the first machining bit has a first end face, the second machining bit has a second end face, and the first end face and the second face are arranged in the same plane extending transversely to the axial extension. Thus, the first end face and the second end face form the front face of the tool. In addition, the first machining bit has a first end face, the second machining bit has a second end face, and the first end face and the second face are arranged having a