Perforating Gun Charge Spacing with Radial Offsets
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Solution Overview
Problem
Traditional perforating gun systems are limited by shot density due to contact between adjacent charges, which restricts the effectiveness of perforations and subsequent wellbore operations such as hydrocarbon flow rates.
Innovation Solution
The perforating gun system employs radially offset shaped charges, variably sized charges, and angled charges to increase shot density, along with detonation train features to minimize shock interference, allowing for closer charge placement and synchronized detonations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional perforating gun systems use adjacent charges positioned in a given space, then shot density is limited, but charge contact prevents further charges from being placed in the given space
Solution Approach 1:
The patent transitions from a traditional planar charge arrangement to a three-dimensional configuration where charges are positioned at different radial distances from the central axis. This dimensional change allows charges to be stacked radially offset from one another, effectively increasing the number of charges that can be placed in a given axial length without charge contact, thereby resolving the contradiction between increasing charge quantity and managing placement complexity.
2Productivity
If shot density is increased by placing more charges in a given space, then perforation effectiveness improves, but adjacent charge contact prevents further density increase
Solution Approach 1:
By introducing radial offset positioning where charges are arranged at different radial distances from the central axis rather than in a single plane, the patent enables closer axial spacing of charges without radial interference. This three-dimensional arrangement increases shot density and perforation effectiveness while avoiding charge contact, thus resolving the contradiction between improving productivity and maintaining adequate charge spacing.
3Area of stationary object
If charges are positioned closer together to increase shot density, then flow area increases, but shock interference between adjacent charges may occur
Solution Approach 1:
The radial offset configuration spaces charges in the radial dimension rather than relying solely on axial spacing. This allows charges to be positioned closer in the axial direction to increase flow area while maintaining sufficient radial separation to reduce shock wave interference between adjacent charges, thereby resolving the contradiction between maximizing flow area and minimizing harmful shock interference.
4Ease of manufacture
If traditional charge arrangement is used, then manufacturing is simpler, but shot density is limited and perforation effectiveness is reduced
Solution Approach 1:
The charge assembly is segmented into multiple radial stations or levels at different distances from the central axis. Each radial station can be independently manufactured and assembled, making the complex three-dimensional configuration manageable. This segmentation approach maintains ease of manufacture while enabling the higher shot density required for improved perforation effectiveness, thus resolving the contradiction between manufacturing simplicity and productivity.
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 configuration enhances the flow area through the casing, improving operations like production, washing, and fracking by increasing the total flow area and reducing shock interference.
Implementation Method 1
a plurality of charges secured to the central support structure, each charge configured to perforate a casing and/or sidewall of a wellbore upon detonation
Implementation Method 2
the shaped charges are detonated. The detonation perforates the casing string, the cementing, and the subterranean formation
Implementation Method 3
detonation train features to minimize shock interference
Data Source
AI summary
A perforating gun system may include a central support structure and a plurality of charges secured to the central support structure. Each charge of the plurality of charges is configured to perforate a casing and/or sidewall of a wellbore upon detonation. Further, the plurality of charges comprises a first group of charges and a second group of charges, and each charge of the second group of charges is radially offset from each charge of the first group of charges with respect to the central support structure.