Downhole Ball Release Mechanism for Cable Erosion Avoidance
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Solution Overview
Problem
Hydraulic fracture monitoring systems face damage from high-velocity fluid flows due to reduced cluster efficiency, leading to erosion and structural degradation of polymer-locked optical fiber cables, compromising their effectiveness in monitoring fracture fluid behavior.
Innovation Solution
A downhole electromechanical release device that deploys a sealing ball to temporarily seal the plug, allowing repositioning or retrieval of polymer-locked cables, using a collet mechanism to disengage from the optical fiber system, and is actuated remotely via electrical commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer-locked cables are deployed in horizontal wellbores for hydraulic fracture monitoring, then fracture fluid flow can be monitored, but high-velocity fluid flows cause localized erosion and structural degradation of the cables
Solution Approach 1:
The system enables dynamic repositioning of the polymer-locked cable from high-risk zones with high-velocity fluid flow to safer locations. The release device allows the cable to be moved along the wellbore to areas with lower erosion risk, maintaining monitoring effectiveness while avoiding continuous exposure to harmful high-velocity flows.
Solution Approach 2:
The release device acts as an intermediary mechanism between the polymer-locked cable and the wellbore environment. It provides a controlled interface that allows the cable to be selectively released and repositioned, mediating between the need for continuous monitoring and the need to protect the cable from erosion damage.
2Duration of action of stationary object
If polymer-locked cables are left in place during high-velocity flow conditions, then continuous monitoring is maintained, but structural integrity and sensing functionality are compromised
Solution Approach 1:
The system transitions from a static cable deployment to a dynamic repositioning capability. When high-velocity flow conditions are detected, the release device is activated to move the cable to a safer location, thereby preserving structural integrity while maintaining the ability to continue monitoring operations.
Solution Approach 2:
The release device is pre-deployed and positioned alongside the polymer-locked cable before high-velocity flow conditions occur. This preliminary positioning enables rapid response by allowing the cable to be quickly repositioned to a safer location when erosion conditions begin, preventing damage before it occurs.
3Strength
If the cable is relocated to avoid erosion, then structural integrity is preserved, but monitoring continuity may be interrupted
Solution Approach 1:
The release device is designed to enable continuous monitoring operations. The cable can be quickly released and repositioned along the wellbore to a safer location without requiring complete system shutdown or extended downtime, thus maintaining continuity of the useful monitoring action while preserving cable integrity.
Data Source
AI summary
A downhole sealing device includes a ball, a collet coupled to the ball, a release device, and an electrical release board. The device is configured to release the ball and collet onto a downhole plug seat during hydraulic fracturing. In operation, an electrical signal is sent to the release device, actuating the release of collet fingers. Pressure equalization occurs through ports in the ball before the ball and collet are released to seal the plug seat. The device may be used to enable relocation of a hydraulic fracture monitoring cable when high-risk conditions are detected. After sealing is achieved, the cable and monitoring equipment may be moved to a safer location without halting the fracturing operation. The ball and collet may later be milled to restore wellbore access. The system supports real-time actuation and may be compatible with addressable command signals for selective downhole operation.