Downhole Wireline Tool With Opposite-Rotating Drilling Bits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing downhole tools face difficulties in easily and safely drilling out rotating objects such as balls or stuck plugs in well tubular structures, as they tend to rotate with the drilling bit, hindering removal.
Innovation Solution
A downhole wireline tool with a gearing system that includes a first and second gearing part rotating in opposite directions, allowing a first machining bit to drill out rotating objects while a second bit grips and fixes the object, combined with a reduction gear to manage rotational speed and a driving unit for propulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single drilling bit is used to drill out rotating objects, then the drilling operation can be performed, but the rotating object rotates along with the drilling bit, hindering easy removal
Solution Approach 1:
The drilling system is segmented into two separate drilling bits: a first drilling bit for engaging and rotating the stuck object, and a second drilling bit for drilling out the object. This segmentation allows each bit to perform its specific function independently, solving the problem of the object rotating with a single bit.
Solution Approach 2:
The first drilling bit acts as an intermediary that engages and rotates the stuck object, while the second drilling bit performs the actual drilling out. This intermediary mechanism allows the system to overcome the rotation problem by separating the rotation function from the drilling function.
2Productivity
If a drilling bit engages a rotating object, then drilling can proceed, but the object rotates along with the bit, preventing effective removal
Solution Approach 1:
The system segments the drilling operation into two independent bits: one for rotation engagement and one for material removal. This allows the first bit to reliably rotate the object at appropriate speeds while the second bit reliably drills out the object, ensuring both productivity and successful removal.
Solution Approach 2:
Instead of having a single bit both rotate and drill (which causes rotation problems), the system inverts the approach by using one bit to rotate and another to drill, reversing the conventional single-bit design that caused the reliability issue.
3Productivity
If high rotational speed is used for drilling, then productivity increases, but control and precision decrease
Solution Approach 1:
The system segments the rotational functions into two independent bits with independent rotational control. The first bit can rotate at high speeds for efficient engagement, while the second bit rotates at controlled speeds for precise drilling out, allowing high productivity without sacrificing control.
Solution Approach 2:
The system implements dynamic control where each drilling bit can rotate independently at different speeds and directions. This dynamic capability allows optimization of rotational speed for each specific function, maintaining both productivity and control throughout the drilling process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient, safe, and quick drilling out of rotating components by utilizing opposite rotational directions and a robust reduction gear, ensuring complete removal without leaving residues.
Implementation Method 1
an electric motor powered by the wireline for rotating a rotatable shaft
Implementation Method 2
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
Data Source
AI summary
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, 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.