Self-Orienting Shaped Charge Frame for Accurate Well Perforation
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Solution Overview
Problem
Existing perforation tools in hydrocarbon production often misposition, leading to sub-optimal perforation due to slight misalignment of the blast vector from shaped charges.
Innovation Solution
A self-orienting shaped charge frame assembly with a tubular electrical conductor and rotatable shaped charge frames, utilizing bearings or weight members to ensure the charges are directed accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the perforation tool is positioned without orientation mechanism, then the device complexity is reduced, but the manufacturing precision of perforation direction deteriorates
Solution Approach 1:
The shaped charge frame assembly utilizes its own weight distribution to achieve automatic orientation. By positioning the center of gravity away from the rotational axis through asymmetric placement of components (shaped charges, bearings, electrical conductors), the assembly self-orients in the desired direction under gravitational influence without requiring external orientation mechanisms or complex control systems.
Solution Approach 2:
The design creates a gravitational potential gradient by establishing an asymmetric mass distribution within the rotatable frame. The center of gravity is deliberately positioned at a distance from the rotational axis, creating a torque that drives the frame to rotate until it reaches a stable equilibrium position where the blast vector aligns with the desired perforation direction.
2Reliability
If the shaped charge frame is fixed, then the device complexity is reduced, but the reliability of charge orientation deteriorates
Solution Approach 1:
The shaped charge frame is designed to be rotatable rather than fixed, allowing dynamic adjustment of the blast vector direction. The frame can rotate about the longitudinal axis of the tubular electrical conductor, enabling the shaped charges to be oriented in the desired direction while maintaining electrical connectivity through the flexible conductor arrangement.
Solution Approach 2:
Cylindrical bearings are introduced as intermediary components between the shaped charge frame and the tubular electrical conductor. These bearings facilitate smooth rotation of the frame while supporting the weight of the shaped charges and maintaining the structural integrity of the assembly during the orientation process.
3Manufacturing precision
If multiple components are added for orientation, then the manufacturing precision of perforation direction is improved, but the loss of time for assembly increases
Solution Approach 1:
The orientation system is segmented into modular components: the tubular electrical conductor, the shaped charge frame with bearings, and the weight distribution elements. This segmentation allows for pre-assembly and testing of individual components before final integration, potentially reducing on-site assembly time while maintaining orientation precision.
Solution Approach 2:
Multiple functions are merged into the shaped charge frame assembly: the frame provides structural support, the bearings enable rotation, the asymmetric mass distribution provides self-orientation capability, and the electrical conductor maintains electrical connectivity. This consolidation reduces the number of separate components that need to be assembled while achieving precise perforation direction control.
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 solution allows for precise orientation of shaped charges, enhancing the efficiency and effectiveness of hydrocarbon extraction by ensuring accurate perforation in desired directions.
Implementation Method 1
at least two cylindrical bearings disposed around the electrical conductor, wherein the at least two bearings are freely rotatable between the electrical conductor and the shaped charge frame
Implementation Method 2
The tools generally have explosive charges shaped to project a jet of reaction products, including hot gases and molten metal, into the formation
Data Source
AI summary
Shaped charge tools are provided for perforating hydrocarbon wells. A shaped charge frame assembly may include a tubular electrical conductor and a shaped charge frame disposed around the tubular electrical conductor and rotatably engaged with the tubular electrical conductor. One or more bearings may be used to engage the shaped charge frame with the tubular electrical conductor, or the engagement may be bearing-free.