Overshot Tool Deformable Member for Stuck Fishing
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Solution Overview
Problem
Existing overshot tools face challenges in efficiently retrieving stuck tools downhole due to limitations in pressure integrity and ease of removal, requiring complex fishing operations.
Innovation Solution
An overshot tool design featuring a grapple with a rotationally fixed torque sub and a deformable member, allowing for adjustable axial length and torsional movement, which enhances the tool's ability to engage and release stuck tools while maintaining pressure integrity through a telescopic seal system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional overshot tools are used to retrieve stuck tools, then the retrieval function is provided, but the operation becomes complex and time-consuming
Solution Approach 1:
The overshot tool incorporates a deformable member that can dynamically change shape from a compressed configuration during running to an expanded configuration during engagement. This dynamic transformation allows the tool to automatically adapt to the stuck tool geometry, simplifying the engagement process and reducing operational complexity while maintaining high retrieval efficiency
Solution Approach 2:
The tool utilizes temperature-sensitive deformable members that change their physical parameters (shape, size) in response to temperature changes. During running, the deformable member is in a compressed state; when exposed to heat from the stuck tool or surrounding formation, it automatically expands to engage the tool, eliminating the need for complex manual adjustment mechanisms
2Ease of operation
If the overshot tool engages the stuck tool, then retrieval is enabled, but pressure integrity may be compromised
Solution Approach 1:
The seal element is designed with non-uniform properties - it features a tapered configuration where the diameter varies along its length, with the larger diameter portion positioned to engage the stuck tool. This local variation in geometry allows the seal to maintain pressure integrity at the engagement interface while the deformable member expands to engage the tool, resolving the contradiction between engagement capability and pressure integrity
Solution Approach 2:
The seal element acts as an intermediary between the deformable member and the stuck tool. As the deformable member expands to engage the tool, the seal element maintains contact with the tool surface to preserve pressure integrity, mediating between the mechanical engagement function and the pressure containment requirement
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 enables efficient retrieval and release of stuck tools by maintaining pressure integrity and facilitating easy removal, improving operational efficiency and reducing the need for complex fishing operations.
Implementation Method 1
a deformable member in operable communication with the torque sub
Data Source
AI summary
An overshot tool includes a grapple, a torque sub rotationally fixed to the grapple and a deformable member in operable communication with the torque sub. The torque sub is responsive to torsional movement thereof. A method for retrieving a fish with the tool is also included.