Downhole Fast Separation Tool for Stuck Wireline Retrieval
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Solution Overview
Problem
Existing wireline cables used in horizontal or high-angle wells face issues with tools getting stuck due to debris and well curvature, leading to potential cable breakage and accidents, necessitating the use of mechanical weak points that can cause unintentional separation.
Innovation Solution
A fast separation tool with a full-strength head, activated by an addressable switch, mechanically disconnects the tool string from the wireline cable using a detonator to equalize pressure and prevent cable breakage, eliminating the need for weak points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical weak points are used in wireline cables to prevent tools from getting stuck, then tool retrieval is facilitated, but unintentional separation and cable breakage may occur
Solution Approach 1:
The system divides the tool string into separable sections using a mechanical disconnect device that can split the tool string from the wireline cable. This segmentation allows controlled separation only when needed, rather than having weak points throughout the cable that could fail unintentionally.
Solution Approach 2:
A mechanical disconnect device acts as an intermediary between the tool string and wireline cable. This intermediary component provides a controlled separation mechanism that prevents direct stress transmission to weak points in the cable, eliminating unintentional separation while enabling intentional tool retrieval.
2Productivity
If tools are left in the wellbore due to getting stuck, then operational continuity is maintained, but cable breakage and accidents risk increases
Solution Approach 1:
The mechanical disconnect device is pre-installed on the tool string before deployment. This preliminary preparation enables immediate separation if tools get stuck, preventing cable breakage while maintaining operational continuity through rapid response capability.
Solution Approach 2:
The system applies preliminary anti-action by providing a preventive separation mechanism that counteracts the potential harmful effect of cable breakage. The disconnect device is positioned to prevent stress accumulation that could lead to cable failure, while allowing operational continuity.
3Strength
If full-strength wireline cables are used without weak points, then cable integrity is improved, but tool retrieval becomes difficult when tools get stuck
Solution Approach 1:
The invention extracts the separation function from the wireline cable itself and places it in a dedicated mechanical disconnect device on the tool string. This allows the cable to maintain full strength without weak points, while the extracted separation mechanism provides controlled tool retrieval capability.
Solution Approach 2:
The mechanical disconnect device serves as an intermediary that provides the separation function without compromising cable integrity. This intermediary component enables tool retrieval while allowing the wireline cable to maintain its full strength throughout its length.
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 safer, more reliable operations by preventing cable breakage and reducing operational mistakes, facilitating easier tool retrieval and reducing the risk of accidents.
Implementation Method 1
an explosive charge and a detonator assembly at least partially included in a void included in the first endpiece
Data Source
AI summary
A release tool that provides mechanical disconnection between, for example, a stuck tool string and the wireline cable in pumpdown perforating operations.