Alignment Sub Assembly for Perforation Gun Orientation
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Solution Overview
Problem
Wellbore tools, particularly perforation guns, often fail to consistently orient shaped charges in the direction of maximum principle stress, leading to irregular perforations and impaired hydrocarbon flow due to tortuous fractures and complex near-wellbore flow paths.
Innovation Solution
An alignment sub assembly is introduced, comprising a first and second sub body part rotatably coupled with a locking mechanism, allowing precise alignment and locking of shaped charges in adjacent perforation guns to ensure consistent perforation sizes and orientations, thereby aligning the wellbore tool string with the maximum principle stress direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If perforation guns are connected in a tool string without alignment mechanisms, then assembly and deployment are simplified, but shaped charges cannot be consistently oriented in the direction of maximum principle stress, resulting in irregular perforations and impaired hydrocarbon flow
Solution Approach 1:
The alignment sub assembly is divided into distinct functional segments: a body portion with internal cavity, a first sub-assembly with shaped charges, and a second sub-assembly with corresponding features. This segmentation allows each component to be independently manufactured and aligned, enabling precise orientation control while maintaining modular assembly simplicity.
Solution Approach 2:
The body portion of the alignment sub acts as an intermediary component between adjacent perforation guns. It provides a reference cavity and locking mechanism that mediates the alignment between the first and second sub-assemblies, ensuring consistent oriented of shaped charges without requiring direct complex interfacing between the guns themselves.
2Reliability
If wellbore tool strings are deployed without orientation control, then deployment time and cost are reduced, but perforations are not consistently oriented in the direction of maximum stress, creating tortuous fractures and complex near-wellbore flow paths
Solution Approach 1:
The alignment sub assembly is pre-configured with matching features (cavity geometry, locking mechanisms, reference surfaces) that automatically guide the orientation of shaped charges during assembly. This preliminary preparation of alignment features eliminates the need for time-consuming downhole orientation adjustments and ensures consistent perforation direction from the start.
Solution Approach 2:
The alignment mechanism is designed to be self-aligning through complementary geometric features between the body portion cavity and the sub-assembly components. When assembled, the features automatically orient the shaped charges in the correct direction without requiring external alignment tools or additional orientation steps, making the system self-sufficient for achieving consistent perforation orientation.
3Productivity
If shaped charges are oriented without alignment mechanisms, then device simplicity is maintained, but perforation sizes vary and fracture networks become tortuous, increasing the chance of premature screen-out
Solution Approach 1:
The alignment sub assembly utilizes asymmetric geometric features, including a non-circular cavity cross-section and correspondingly shaped sub-assembly components. This asymmetry creates a unique fit that automatically orients the shaped charges in the correct direction, preventing rotation to incorrect orientations and ensuring consistent perforation sizes without requiring complex active control mechanisms.
Data Source
AI summary
An alignment sub may include a first sub body part rotatably coupled to a second sub body part. The first sub body part and second sub body part may be respectively non-rotatably coupled to a first wellbore tool and a second wellbore tool. A lock screw switchable between an unlocked state and a locked state may fix an angular position of the first sub body part relative to an angular position of the second sub body part when the lock screw is in the locked state.