Pre-assembled Loading Tube for Perforating Gun Assembly
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Solution Overview
Problem
Current perforating gun systems require on-site assembly of detonators, which is risky due to potential mistakes in connecting wires in a small space, and is inefficient as it consumes costly rig and operating time.
Innovation Solution
A loading tube is pre-assembled with an RF-safe initiator, wiring, detonating cord, and shaped charges at a first location, allowing for pre-arming and transportation to the site of operation, reducing on-site risks and increasing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detonator assembly is performed on-site at the perforating location, then the gun can be assembled with all components including detonator, but the process consumes costly rig time and increases risk of connection mistakes in small space
Solution Approach 1:
The patent applies preliminary action by pre-assembling the initiator and wiring within the loading tube at a manufacturing location before shipping to the well site. This allows the majority of assembly to be completed in advance, reducing on-site work to simple insertion of the detonator component, thereby eliminating connection mistakes and saving rig time
2Productivity
If all components are assembled at the perforating site, then the gun can be fully assembled, but the process is inefficient and consumes costly operating time
Solution Approach 1:
The loading tube is pre-prepared with initiator and wiring installed at the factory, allowing rapid assembly at the well site by simply inserting the detonator component. This preliminary preparation dramatically improves assembly efficiency while minimizing the time the rig must wait
Solution Approach 2:
The system is divided into separable components: the loading tube with pre-installed initiator/wiring can be prepared independently at the factory, then combined with the detonator at the well site. This segmentation allows parallel preparation and reduces on-site assembly time
3Ease of manufacture
If wire connections are made in a small space at the perforating site, then the gun can be assembled, but the risk of connection mistakes increases
Solution Approach 1:
All complex wire connections and initiator installations are completed in advance at the factory where adequate space and equipment are available. This eliminates the need to perform delicate wiring work in the confined space of the loading tube at the well site, ensuring connection reliability while maintaining assembly feasibility
Solution Approach 2:
The complex wiring and initiator installation tasks are extracted from the on-site assembly process and performed separately at the factory. This removes the problematic element (complex connections in small space) from the field operation, leaving only simple component insertion
Data Source
AI summary
A process is disclosed for assembling a loading tube for a perforating gun for use in a perforating system. At a first location, e.g., a shop, which is not the location at which perforating operations will be conducted, the loading tube is completely assembled. The completely assembled loading tubing is then transported to a second location where perforating operations are to be conducted. In one embodiment, an RF-safe initiator, wiring, a detonating cord and a plurality of shaped charges are installed into the loading tube at a first location. The RF-safe initiators may comprise an exploding foil initiator or an exploding bridge wire. A process for assembling a loading tube for a single-shot perforating gun is also disclosed.