Rust Resistant Well Perforating Gun With Gripping Surfaces
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Solution Overview
Problem
Existing well perforating guns face issues with rust resistance, leading to increased field time for handling dirty components, potential for tool wear and injury, and risk of fracturing under high energy explosions, while lacking effective coatings to protect against environmental factors.
Innovation Solution
A method for creating a rust-resistant well perforating gun with coatings on the gun carrier, charge loading tube, and end caps, featuring machined recesses and gripping surfaces to prevent slippage and wear, using coatings like zinc phosphate or black oxide to enhance durability and ease of assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional well perforating guns are used without protective coatings, then the device structure remains simple, but the components are prone to rust and degradation in harsh environments
Solution Approach 1:
The patent applies protective coatings (zinc phosphate, black oxide) to components before final assembly. This preliminary protective action prevents rust and degradation before the components are exposed to harsh well environments, thereby improving reliability without requiring complex protective mechanisms during operation
Solution Approach 2:
The patent uses relatively thin protective coating layers (e.g., zinc phosphate coating at 0.00015-0.001 inches) that provide adequate corrosion protection for the service life of the perforating gun. These coatings are applied economically and provide sufficient protection for the typically single-use or limited-use nature of perforating guns
2Strength
If smooth surfaces are used on the gun carrier, then manufacturing is simpler, but the gun carrier cannot effectively contain high-energy explosion pluses and may fracture
Solution Approach 1:
The patent incorporates recesses (scallops) at specific locations on the gun carrier outer surface where explosion pluses are generated. These localized surface variations concentrate and contain the high-energy pluses, preventing them from reflecting off smooth surfaces and causing fractures. The rest of the gun carrier maintains a simpler smooth surface for ease of manufacture
Solution Approach 2:
The patent transitions from a perfectly smooth two-dimensional surface to a three-dimensional surface with recesses. This dimensional change allows the surface to interact with explosion pluses in a new way, containing them within the recesses and directing energy outward rather than allowing reflective fractures
3Ease of operation
If traditional assembly methods are used without gripping surfaces, then the device structure is simpler, but assembly requires more field time and creates safety hazards
Solution Approach 1:
The patent adds gripping surfaces (knurling, scoring, or turned bands) only at specific locations on the gun carrier and charge loading tube where handling is required for assembly. These localized textured features provide enhanced grip for wrenches and user hands, improving assembly safety and speed without adding gripping features to the entire device structure
Solution Approach 2:
The gripping surfaces are pre-formed on components during manufacturing, so that when assembly is performed in the field, the enhanced grip features are already in place. This preliminary preparation eliminates the need for field workers to create their own grip points, reducing assembly time and safety risks
4Reliability
If no recesses are formed in the gun carrier, then the device structure is simpler, but high-energy explosion pluses reflect off the surface and cause premature fractures
Solution Approach 1:
The patent places recesses only in specific areas of the gun carrier where explosion pluses are generated and travel. These localized recesses intercept and contain the pluses, preventing them from reflecting off the smooth outer surface and causing fractures. The rest of the structure remains simple without unnecessary recesses
Solution Approach 2:
The patent converts the potentially harmful reflection of high-energy pluses off smooth surfaces into a beneficial contained explosion within recesses. By providing recesses, the harmful reflected energy is transformed into controlled localized energy release that fractures the formation rather than the gun carrier
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 rust-resistant, high-energy capable well perforating gun that reduces field time, minimizes tool wear and injury risks, and maintains performance in various weather conditions without fracturing, allowing for efficient and safe operation.
Implementation Method 1
A method involving coatings such as zinc phosphate or black oxide on key components
Data Source
AI summary
A method for perforating a well using a rust resistant well perforating gun can include disposing coatings over the rust resistant well perforating gun to prevent rust, loading a charge into a charge hole, engaging a detonation cord with the charge and an actuator, engaging the charge loading tube into the gun carrier, lowering the rust resistant well perforating gun into the well, actuating the actuator, and exploding the charge to: form a high pressure in the gap, allow jets to pierce the recesses to produce high energy pulses, and fractionate the formation using the high energy pulses.