Helical Perforation Charge Spacing Algorithm
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Solution Overview
Problem
The existing downhole tools for creating perforation tunnels in boreholes face challenges in maintaining even spacing, which affects the stability and flow characteristics of production fluid extraction, as perforation tunnels can collapse due to debris or pressure, leading to reduced flow rates.
Innovation Solution
A downhole tool with a specific algorithm to determine the pitch and phase angles for evenly-spaced perforation tunnels, arranged in patterns such as square or equilateral triangle, ensuring consistent spacing along a helix, thereby minimizing tunnel collapse and maximizing fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If perforation tunnels are formed too closely, then more perforation tunnels can be created in a given area, but debris from collapsed tunnels and pressure cause adjacent tunnels to merge or collapse, reducing flow rate
Solution Approach 1:
The patent applies parameter changes by calculating optimal spacing parameters (pitch and phase angles) based on formation properties and desired flow characteristics. The system adjusts the spatial parameters of charge placement to ensure sufficient separation between perforation tunnels, preventing collapse and merging while maximizing the number of functional tunnels per unit area.
Solution Approach 2:
The patent implements preliminary action by pre-calculating the optimal positions and spacing of charges before detonation. The algorithm determines pitch and phase angles in advance to ensure that when perforation tunnels are formed, they will be sufficiently spaced to avoid collapse and debris interference, thereby ensuring long-term flow rate reliability.
2Reliability
If perforation tunnels are formed too far apart, then tunnel stability is improved, but production fluid must travel longer paths to reach tunnels, decreasing extraction rate
Solution Approach 1:
The system optimizes spacing parameters to achieve the minimum effective distance between tunnels that ensures stability while minimizing flow path length. By adjusting pitch and phase angle parameters, the system creates a configuration where tunnels are spaced just enough apart to prevent collapse but close enough to maintain short flow paths for high extraction rates.
Solution Approach 2:
The patent employs dynamic optimization by adapting the spacing parameters to specific formation conditions and operational requirements. The system can adjust the pitch and phase angles based on real-time parameters such as formation porosity, permeability, and desired production rates, creating an optimal balance between stability and productivity for each specific application.
3Productivity
If charges are arranged in a spiraling pattern, then perforation tunnels can be formed efficiently, but achieving even spacing is difficult, leading to variable flow characteristics
Solution Approach 1:
The patent applies preliminary action by pre-calculating precise pitch and phase angle values before charge placement. The algorithm determines the exact angular and spatial positions of each charge in the spiral pattern, ensuring uniform spacing between adjacent perforation tunnels. This pre-planned geometric arrangement guarantees consistent flow characteristics while maintaining efficient spiral patterning.
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 algorithm ensures stable and efficient fluid flow by maintaining even spacing of perforation tunnels, reducing the likelihood of tunnel collapse and optimizing the flow path, thereby enhancing production fluid extraction rates.
Implementation Method 1
The charges are detonated, thereby forming perforation tunnels through the casing and in the formation
Data Source
AI summary
A downhole tool for perforating a borehole includes a gun body and charges arranged in a helix around the gun body and evenly spaced from both a nearest neighbor along the helix and a nearest neighbor in an adjacent wrap of the helix. Further, placement of the charges is based on a specified diameter of the borehole and specified charge density.