Wireline Tool String Vibration Damping for Hard-Material Machining
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Solution Overview
Problem
Existing wireline intervention tools face challenges in machining hard materials deep within a well due to limited power availability and amplified vibrations that can damage tool sections and disrupt anchoring.
Innovation Solution
A wireline intervention tool string equipped with a vibration-dampening unit positioned between the operational tool and the anchoring section to absorb or isolate vibrations, allowing for effective machining in hard materials using a vibration-generating unit that provides oscillating forces up to 200 Hz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a wireline intervention tool string is used to machine hard materials deep in a well, then the ability to machine hard materials is improved, but vibrations are amplified and transmitted to other tool sections causing damage or separation
Solution Approach 1:
A vibration-dampening unit is introduced as an intermediary component between the operational tool and the anchoring section. This unit acts as a mediator that absorbs and dampens vibrations generated during machining of hard materials, preventing their transmission to the anchoring section and other tool sections, thereby protecting tool integrity while maintaining machining capability
Solution Approach 2:
The vibration-dampening unit converts the harmful vibrations generated during machining into dampened oscillations that are absorbed rather than transmitted. The vibration energy that would otherwise cause damage is transformed into a controlled, dissipative process that protects the tool string while allowing machining to proceed
2Ease of operation
If power is transmitted via wireline from the surface, then the tool can be operated deep in the well, but the available power is very limited (corresponding to that used by a hairdryer)
Solution Approach 1:
The operational tool utilizes vibration-generating units to create high-frequency oscillations that assist the machining process. This vibration-assisted machining reduces the cutting forces and power requirements, enabling effective machining of hard materials with the limited power available from wireline transmission
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
The tool string effectively machines in hard materials deep within a well without damaging tool sections or disrupting anchoring, enabling operations previously impossible with prior art tools, and reducing the risk of tool separation and loss.
Implementation Method 1
a vibration-dampening unit arranged in a longitudinal position uphole relative to the operational tool for preventing vibrations generated by the vibration-generating unit from damaging tool sections that are uphole to the operational tool
Implementation Method 2
a vibration-generating unit for providing vibration force to the operational tool
Data Source
AI summary
The present invention relates to a wireline intervention tool string (1) for operating in a well (2) having a longitudinal axis, a top (51) and a bottom (52), comprising a tool housing (3) having a longitudinal tool axis, a first part connected to a wireline and configured to face the top of the well, the first part comprising an anchoring section (6) and configured to be rotationally stationary during operation, an operational tool (7) configured to rotate relative to the first part during operation, a driving unit (8) arranged in the first part and configured to provide rotational force to the operational tool, the driving unit being powered via the wireline, and a vibration-generating unit (9) for providing vibration force to the operational tool, wherein the wireline intervention tool string further comprises a vibration-dampening unit (10) arranged in a longitudinal position uphole relative to the operational tool for preventing vibrations generated by the vibration-generating unit from releasing tool sections from other tool sections of the wireline intervention tool string, at least in the first part. The invention also relates to downhole tool system comprising the wireline intervention tool string and a driving section/downhole tractor (15).