Self-Orienting Perforating Charge Cartridge for Precise Alignment
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Solution Overview
Problem
Existing perforating guns in oil and gas completions operations face challenges in aligning perforating charges accurately and efficiently, leading to suboptimal perforation of wellbores.
Innovation Solution
A self-orienting charge cartridge system with orienting weights and self-orienting bearings that allow perforating charges to align in a straight line without phasing, facilitated by a toolless assembly process, ensuring precise orientation and detonation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional alignment methods are used for perforating charges, then assembly complexity is reduced, but alignment precision deteriorates
Solution Approach 1:
The charge cartridge incorporates self-orienting features including an asymmetric centering mechanism with a D-shaped cross-section that automatically orients the charge in the correct position within the carrier tube during assembly. The charge holder includes a flat spot that engages with a corresponding protrusion in the carrier tube, providing self-alignment without requiring complex external alignment tools or procedures.
Solution Approach 2:
The charge cartridge employs asymmetric geometric features including a D-shaped centering mechanism with a flat side that must engage with a corresponding protrusion in the carrier tube. This asymmetric design ensures that the charge can only be assembled in the correct orientation, automatically achieving precise alignment without requiring complex alignment procedures or skilled labor.
2Productivity
If manual alignment procedures are used, then equipment complexity is minimized, but time consumption increases
Solution Approach 1:
The self-orienting charge cartridge automatically aligns itself within the carrier tube through its asymmetric centering mechanism during the assembly process. The D-shaped cross-section with a flat spot engages with a corresponding protrusion in the carrier tube, providing automatic orientation that eliminates time-consuming manual alignment procedures and enables faster assembly by workers of varying skill levels.
3Manufacturing precision
If simple charge holder design is used, then manufacturing cost is reduced, but orientation accuracy deteriorates
Solution Approach 1:
The charge holder incorporates a flat spot on its outer surface that corresponds to a protrusion in the carrier tube, creating an asymmetric engagement mechanism. This relatively simple asymmetric feature ensures that the charge cartridge can only be assembled in the correct orientation, providing reliable orientation accuracy without requiring complex manufacturing processes or high-precision machining.
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 system ensures accurate alignment and detonation of perforating charges, enhancing the efficiency and effectiveness of wellbore perforation in oil and gas operations.
Implementation Method 1
a bearing rotationally supporting the perforating charge within the carrier tube
Implementation Method 2
a ground spring provides grounding electrical contact with the conductor sub in order to ground the self-orienting charge cartridge directly to the conductor sub
Implementation Method 3
the orienting weight is adapted to be acted upon by gravity, thereby rotating the self-orienting charge cartridge via the bearing in order to aim the perforating charge in a desired direction
Data Source
AI summary
A perforating gun with a self-orienting charge cartridge is disclosed for use in oil and gas completions operations. In one or more embodiments, the perforating gun may include a carrier tube within which the self-orienting charge cartridge extends and a conductor sub coupled to the carrier tube. In one or more embodiments, the self-orienting charge cartridge includes a perforating charge and a bearing, and is configured so that the perforating charge is initiable via the conductor sub and the bearing rotationally supports the perforating charge within the carrier tube. A gun string including the perforating gun and one or more additional perforating guns substantially identical to the perforating gun is also disclosed.