Grapple Release Tool Prevents Accidental Activation
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Solution Overview
Problem
Downhole tools face accidental activation issues when non-intended objects land on their activation seats, leading to unintended disconnection from bottom hole assemblies, which can result in stuck situations in well bores.
Innovation Solution
A grapple release tool with a main body, upper piston, pop lock, secondary housing, and nose shear screws is designed to prevent accidental activation, utilizing a specific dart and ball mechanism to ensure controlled disconnection by diverting fluid flow and overcoming friction to release the pop lock, allowing safe separation from the bottom hole assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple activation seat is used, then the device is easy to operate, but it is prone to accidental activation by non-intended objects
Solution Approach 1:
The activation mechanism is segmented into multiple components: the activation seat, the dart with actuator, the pop lock, and the piston. Each component has a specific function, and none can activate the tool without the others being in the correct position and configuration. This segmentation ensures that only the intended dart can activate the tool while maintaining operational simplicity.
Solution Approach 2:
The pop lock acts as an intermediary component between the piston and the grapple release mechanism. It prevents the piston from moving unless the dart has correctly engaged the activation seat and overcome the nose shear screw. This intermediary element mediates between the activation input and the release output, preventing accidental activation.
2Strength
If a secure locking mechanism is used, then the tool remains firmly connected, but it becomes difficult to release when needed
Solution Approach 1:
The release mechanism substitutes a simple mechanical action (dart landing on activation seat) for a complex mechanical disassembly process. The dart's weight and the fluid pressure work together to automatically overcome the nose shear screw and pop lock, releasing the grapple without requiring manual intervention or complex operations.
Solution Approach 2:
The system changes parameters (force, pressure) dynamically during operation. During normal operation, the nose shear screw and pop lock maintain high connection strength. During release, fluid pressure increases and the dart's weight contributes to overcoming these locking forces, changing the force balance to enable easy release.
3Reliability
If multiple safety features are added, then accidental activation is prevented, but the device complexity increases
Solution Approach 1:
Multiple safety features are merged into a compact integrated design. The activation seat, dart, pop lock, and nose shear screw are all part of a unified activation mechanism that works together in a single sequence. This merging provides multiple safety layers without proportionally increasing overall device complexity, as the components share space and functional integration.
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 grapple release tool effectively prevents accidental disconnections by ensuring that only the intended dart or ball activates the tool, maintaining control and safety during well operations, especially when retrieving stuck bottom hole assemblies.
Implementation Method 1
the upper piston is adapted to shift towards a first end of the main body... diverting fluid flow and overcoming friction to release the pop lock
Implementation Method 2
overcoming friction to release the pop lock
Data Source
AI summary
A grapple release tool comprising: a main body; an upper piston, wherein the upper piston is disposed inside the main body, and wherein the upper piston is adapted to shift towards a first end of the main body; a pop lock having, wherein the pop lock is disposed inside the main body, wherein the pop lock is removably connected to the upper piston; a secondary housing, wherein the secondary housing is disposed inside the main body over the pop lock; a pop lock spacer disposed in the secondary housing, wherein the pop lock spacer is disposed around a second end of the pop lock; and an upper box recut insert disposed in a first end portion of the main body is disclosed. Methods of making and using the grapple release tool are also disclosed.