Radial Driller Multipurpose Element Swarf Management
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Solution Overview
Problem
Existing radial drilling units face challenges with power consumption and stability, particularly in maintaining hydraulic pressure due to swarf accumulation, which can lead to stuck drill bits and complex retrieval operations.
Innovation Solution
The radial driller incorporates a multipurpose element with a retracting chamber and wiper/filter system to protect hydraulic seals from swarf, ensuring stable rotation and easy bit retraction by utilizing differential hydraulic pressures and a secure connection between the drill bit and multipurpose element, allowing for efficient swarf management and reduced risk of bit stalling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydraulic pressure is applied to retract the drill bit, then the drill bit can be pulled back, but swarf may compromise the hydraulic seals and cause pressure loss
Solution Approach 1:
A multipurpose element is introduced as an intermediary component between the drill bit and the hydraulic system. This element includes a retracting chamber that receives and contains swarf, preventing it from reaching and damaging the hydraulic seals. The multipurpose element thus mediates the interaction between the drilling operation and the hydraulic retraction mechanism, allowing both functions to coexist without interference.
Solution Approach 2:
The tool is divided into functionally separate zones: a drilling zone where swarf is generated, and a hydraulic zone where pressure is maintained for retraction. The multipurpose element with its retracting chamber creates a physical segmentation that isolates the hydraulic seals from swarf contamination while still allowing the drill bit to extend and retract freely.
2Productivity
If the drill bit is pressed towards the well wall for drilling, then radial drilling can be performed, but swarf accumulates in limited space and may damage hydraulic seals
Solution Approach 1:
The retracting chamber is designed to extract and contain swarf particles that are generated during drilling. By providing a dedicated space within the multipurpose element where swarf can be collected and isolated, the harmful factor of swarf is removed from the hydraulic system environment, preventing it from damaging the seals while maintaining continuous drilling operation.
3Device complexity
If a simple hydraulic piston system is used, then the device complexity is reduced, but there is no protection against swarf interfering with hydraulic seals
Solution Approach 1:
The multipurpose element performs multiple functions simultaneously: it transfers rotation from the rotating sleeve to the drill bit, provides structural support, and contains the retracting chamber that protects hydraulic seals from swarf. This multi-functional design adds protection without requiring separate dedicated components for each function, thereby limiting the increase in overall device complexity.
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
This solution enhances drilling stability and reduces power consumption by maintaining hydraulic pressure integrity, preventing swarf interference, and simplifying drill bit retraction, thereby minimizing the risk of stuck tools and complex retrieval operations.
Implementation Method 1
While exerting a hydraulic pressure towards the piston in the hydraulic cylinder
Implementation Method 2
A wiper element may be arranged to co-rotate with the multipurpose element and pressing the wiper element against the multipurpose element
Implementation Method 3
A filter element may be arranged to trap swarf particles that may be present in the retracting chamber
Data Source
AI summary
The invention relates to a radial driller for drilling a hole in a well tubular, the radial driller comprising a rotating sleeve that is rotated by means an axial drive organ via an angular gear, the rotating sleeve housing a partially closed cylinder, the cylinder housing a hydraulic piston, a first hydraulic chamber situated below the hydraulic piston, and a second hydraulic chamber situated above the hydraulic piston, the hydraulic piston having a connecting rod arrangement extending above the piston and through an opening in a dividing wall dividing the cylinder from a multipurpose section, and a drill bit connected to the hydraulic piston via the connecting rod arrangement. According to the invention, the radial driller further comprises a multipurpose element positioned directly below the drill bit, the multipurpose element defining a retracting chamber between the multipurpose element and the dividing wall.