Wireline Tractor Directional Change via Swivel Arm Mechanism
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Solution Overview
Problem
Existing wireline tractors face difficulties in reversing direction due to limited space, making it challenging to provide reversible driving wheels.
Innovation Solution
A wireline tractor with a displacement mechanism featuring rotatable or movable swivel arms that allow the driving wheels to switch from bearing against one side of the well wall to the opposite side, enabling directional change without reversing the rotation of the wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If driving wheels are made reversible to enable direction change, then the wireline tractor can move in opposite directions, but the device complexity increases due to limited space constraints
Solution Approach 1:
The patent applies the dynamics principle by making the swivel arms rotatable between first and second positions. This dynamic repositioning of the driving wheels allows the tractor to change direction without reversing wheel rotation. The swivel arms can rotate to reposition driving wheels from bearing against one well wall side to the opposite side, enabling directional versatility through a simple rotational mechanism rather than complex reversible wheel designs.
2Volume of moving object
If the wireline tractor structure is made compact to fit limited well space, then it can operate in narrow boreholes, but it becomes difficult to implement reversible driving wheels
Solution Approach 1:
The patent resolves the space-versatility contradiction by using dynamic repositioning of driving wheels through rotatable swivel arms. Instead of making each wheel individually reversible (which would require additional mechanical components), the system maintains a compact structure while achieving directional reversibility through collective repositioning of the driving wheels to opposite sides of the tractor.
Solution Approach 2:
The swivel arms serve multiple functions: they support the driving wheels, enable directional change by repositioning wheels to opposite sides, and maintain the compact tractor structure. This multi-functionality allows the limited space within the tractor body to be utilized efficiently for both structural support and directional versatility.
3Device complexity
If driving wheels bear against the well wall on one side only, then the structure is simple, but the wireline tractor cannot change direction
Solution Approach 1:
The patent applies dynamics by making the swivel arms rotatable between first and second positions. When in the first position, driving wheels bear against the well wall on one side for inward movement. When rotated to the second position, the same driving wheels bear against the well wall on the opposite side, enabling outward movement. This dynamic repositioning achieves directional versatility without changing the fundamental simple structure of the driving wheel configuration.
Data Source
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AI summary
A device for a wireline tractor (1) comprising at least one driving wheel (4, 8, 12) positioned on a displacement mechanism (6, 10, 14) connected to the wireline tractor (1), in which the displacement mechanism (6, 10, 14) is arranged so as to hold the driving wheel (4, 8, 12) in a biasing manner against a well wall (18), and wherein the displacement mechanism (6, 10, 14) at least is rotatable or movable between a first position at which the driving wheel (4, 8, 12) bears against the well wall (18) on one side of the wireline tractor, and a second position at which the driving wheel (4, 8, 12) bears against the well wall (18) on the opposite side of the wireline tractor (1).