Perforating Gun Shaped Charge Optimization
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Solution Overview
Problem
Current hydraulic fracturing methods face challenges in achieving consistent and efficient perforation in low-permeability rock formations, particularly in unconventional oil and gas recovery operations, where larger entry-hole diameters and increased formation contact are required for effective hydrocarbon extraction.
Innovation Solution
A selective perforating gun assembly with a perforating gun housing of 3.35 to 3.75 inches diameter and shaped charges weighing over 26 grams, made of steel, is used to form perforation tunnels in low-permeability rock formations, allowing for improved hydraulic fracturing by increasing perforation tunnel volume and formation contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional shaped charges are used in hydraulic fracturing operations, then the perforation process is simpler and less costly, but the entry-hole diameters are insufficient and formation contact is limited
Solution Approach 1:
The patent changes the physical parameters of the shaped charge by increasing the explosive load weight to over 26 grams and using a larger gun housing diameter (3.35-3.75 inches), which directly increases the entry-hole diameter and perforation tunnel volume to meet the requirements for unconventional low-permeability formations
Solution Approach 2:
The perforating gun assembly is divided into multiple modular components including the gun housing, shaped charge, and steel casing segments, allowing for standardized manufacturing of each component while achieving consistent perforation results across multiple shots
2Volume of moving object
If larger shaped charges are used to increase perforation tunnel volume, then formation contact increases by 20-100%, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent specifies precise parameter ranges for the shaped charge including explosive load weight (over 26 grams) and gun housing diameter (3.35-3.75 inches), which standardizes the manufacturing process while achieving the required 20-100% increase in perforation tunnel volume
Solution Approach 2:
The shaped charge utilizes composite construction combining explosive material, steel casing, and specialized liners to achieve the required perforation performance while maintaining manufacturability through standardized material specifications
3Productivity
If conventional perforation methods are used in low-permeability formations, then the operation is faster and less complex, but the hydrocarbon extraction efficiency is insufficient
Solution Approach 1:
The patent optimizes key parameters including explosive load weight (over 26 grams) and gun housing diameter (3.35-3.75 inches) to create larger entry holes and increased formation contact (20-100%), which directly improves hydrocarbon extraction efficiency from low-permeability unconventional formations
Solution Approach 2:
The shaped charge is pre-configured with optimized explosive composition and geometry before deployment, allowing it to create the required perforation tunnel volume and formation contact in a single shot, thereby improving extraction efficiency without requiring complex multi-step operations
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 enhances perforation efficiency by providing consistent and larger entry-hole diameters, increasing perforation tunnel volume by 20-100% and formation contact by 20-100% compared to conventional systems, thereby improving hydrocarbon extraction from low-porosity rock formations.
Implementation Method 1
A shaped charge may be positioned in the perforating gun housing. In some embodiments, the shaped charge may be configured to form a perforation tunnel in a low permeability rock formation
Data Source
AI summary
Disclosed embodiments may relate to perforating gun assemblies configured for use in unconventional wells, for example in rock formations with low permeability. In some embodiments, the perforating gun assembly may include a perforating gun housing and at least one shaped charge positioned in the perforating gun housing. The shaped charge and the perforating gun housing may be jointly configured to improve total target penetration in unconventional wells by 20-100%. Related method embodiments may be used to improve the performance of unconventional wells.