Cable Release System for Drill String Detachment
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Solution Overview
Problem
Existing systems for disconnecting wireline cables from stuck drill strings during wireline drilling operations are ineffective, unreliable, and costly.
Innovation Solution
A cable release system comprising a swivel body, bearing assembly, and release sleeve assembly that uses locking elements and a biasing element to axially move the release sleeve, disengaging the swivel body from the overshot system, allowing for reliable separation of the drilling cable from the drill string.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known systems and methods are used to disconnect the wireline cable from the drill string, then the drill string can be released, but the process is ineffective, unreliable, and excessively expensive
Solution Approach 1:
The cable release assembly is divided into distinct functional segments: a swivel body for cable attachment, a bearing assembly for rotational support, and a release sleeve mechanism for controlled disengagement. This segmentation allows each component to perform its specific function reliably while simplifying the overall system design and reducing costs compared to monolithic previous solutions.
Solution Approach 2:
The release sleeve acts as an intermediary mechanism between the swivel body and the drill string. It provides a controlled interface that enables reliable disconnection through axial movement, mediating the separation process in a way that is both effective and cost-efficient compared to direct disconnection methods.
2Productivity
If shear pin solutions are used, then the drill string can be released, but the method is costly and laborious requiring cutting operations
Solution Approach 1:
The release sleeve mechanism is designed to automatically effect the disconnection of the swivel body from the drill string through its own axial movement. The system performs the release operation autonomously without requiring external cutting tools or complex manual intervention, thereby increasing productivity and simplifying the operation.
Solution Approach 2:
The invention replaces the mechanical cutting process (shear pin solutions requiring external cutters) with a purely mechanical disengagement mechanism. The release sleeve's axial movement directly separates the components through designed clearance and interference fit features, eliminating the need for cutting operations and associated equipment.
3Reliability
If gravity-driven drop sleeves are used, then the drill string can be released, but the system is ineffective for stuck drill strings
Solution Approach 1:
The release sleeve is designed with dynamic characteristics that allow it to respond to applied forces (such as weight or hydraulic pressure) by moving axially. This dynamic behavior enables the mechanism to effectively engage and disengage the swivel body from the drill string under various operating conditions, including stuck drill string scenarios where gravity alone may be insufficient.
Solution Approach 2:
The invention combines multiple functions into a single integrated release mechanism: the release sleeve simultaneously provides mechanical disengagement, seals the central bore, and responds to applied forces. This merging of functions maintains simplicity while improving reliability compared to separate gravity-driven drop sleeve systems.
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
Enables efficient and reliable release of stuck drill strings without the need for costly and laborious cutting, overcoming the limitations of previous shear pin solutions and gravity-driven drop sleeves.
Implementation Method 1
a biasing element positioned within the release sleeve and configured to axially move the release sleeve in a second direction
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A cable release system for permitting detachment of a drilling cable from a drill string. The cable release system has a swivel body, a bearing assembly, one or more locking elements, and a release sleeve assembly. The swivel body is coupled to a drilling cable. The bearing assembly has a receptacle body that receives a portion of the swivel body and defines openings that receive a portion of corresponding locking elements. The bearing assembly has an outer sleeve that circumferentially surrounds the receptacle body and has a variable inner diameter such that axial movement of outer sleeve controls the radial position of the locking elements relative to the swivel body. The release sleeve assembly can be moved in a distal direction to engage the outer sleeve of the bearing assembly to move the outer sleeve to an axial position in which the swivel body and drilling cable are detachable from the remainder of the drill string.