Rotating Shaped Charge Holder for Compact High-Pressure Perforating Guns
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing perforating gun assemblies require tandem seal adapters for sealed connections, leading to increased length and cost, and the use of rotating charge tubes can cause tool failure due to friction and wear, while perforating gun housings with step-down contours fail under high pressure.
Innovation Solution
A rotating shaped charge positioning device with a shaped charge holder and initiator holder, integrated with bearing components, allows for sealed connections without tandem adapters and includes a gun housing with a continuous banded scallop geometry to withstand high pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rotating charge tubes are used to orient shaped charges, then the desired firing orientation is achieved, but friction and wear lead to tool failure
Solution Approach 1:
The patent extracts the rotating charge tube component from the system and replaces it with a stationary charge holder. The shaping charge orientation is achieved not through rotation of the holder, but through the gravitational orientation of the shaped charge itself within the stationary holder, eliminating the mechanical wear and friction associated with rotating tubes while maintaining the desired firing orientation capability
Solution Approach 2:
The patent replaces the mechanical rotation system (rotating charge tube with bearings) with a gravitational orientation system. The shaped charge is allowed to orient itself vertically under gravity within the stationary holder, substituting mechanical rotation with gravitational alignment, thereby eliminating friction and wear from the rotation mechanism
2Reliability
If tandem seal adapters are used for sealed connections between perforating guns, then sealing is achieved, but the assembly length and manufacturing cost increase
Solution Approach 1:
The patent merges the sealing function into the gun housing itself by integrating a sealing surface directly into the housing structure. This eliminates the need for separate tandem seal adapters, as the sealing function is combined with the housing, thereby reducing the overall assembly length and component count while maintaining reliable sealed connections between perforating guns
Solution Approach 2:
The gun housing is designed to serve multiple functions: it contains the shaped charge, provides structural support, and incorporates the sealing surface for connections between guns. By making the housing multi-functional (particularly by integrating the sealing function), the patent eliminates the need for dedicated seal adapters, reducing assembly length and complexity
3Ease of manufacture
If step-down contours are machined on the gun housing, then manufacturing cost is reduced, but the housing collapses under high pressure
Solution Approach 1:
The patent changes the geometric parameters of the housing by replacing the step-down contour with a continuous banded scallop geometry. This geometric parameter change allows the housing to better distribute and withstand high pressures while still being manufacturable, thus improving strength without completely sacrificing ease of manufacture
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 provides a reliable, compact, and pressure-resistant perforating gun assembly that maintains tool integrity during operation and retrieval, eliminating the need for tandem seals and reducing failure risks.
Implementation Method 1
The shaped charge holder is rotatable within the gun housing about a central longitudinal axis of rotation. The rotating shaped charge positioning device is integrated with bearing components that reduce friction between the rotating shaped charge holder and the stationary gun housing.
Implementation Method 2
perforating gun housings with step-down contours fail under high pressure. A rotating shaped charge positioning device with a shaped charge holder and initiator holder, integrated with bearing components, allows for sealed connections without tandem adapters and includes a gun housing with a continuous banded scallop geometry to withstand high pressures.
Data Source
AI summary
A downhole perforating gun system may include a first cylindrical gun housing including a first end, a second end, and a central longitudinal axis extending axially therethrough. An electrical connector may be disposed within the first cylindrical gun housing and configured to communicate electrically in the downhole perforation gun system. A shaped charge holder and a first bearing component may be disposed within the first cylindrical gun housing such that the shaped charge holder is rotatable relative to the first cylindrical gun housing. A counterweight mechanism may include one or more weights and may be rotatable by the weights via the first bearing component based on gravity.