Multi-Cycle Wellbore Scraper Blade Actuation Without Flow Restriction
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Solution Overview
Problem
Conventional downhole cleaning tools require multiple trips and single-use activation cycles, necessitating the deployment of scraper blades through shearing devices, which restricts fluid flow and extends cleaning operations.
Innovation Solution
A remotely deployable and retractable scraper blade system that allows multiple deployment cycles without shearing, using magnets and fluid-activated mechanisms to deploy and retract blades, enabling multi-use and unrestricted fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scraper blades are deployed in conventional cleaning tools, then cleaning operation is performed, but fluid flow is obstructed
Solution Approach 1:
The cleaning tool is divided into multiple independent scraper blade assemblies that can be individually deployed and retracted. Each scraper blade is mounted on a separate movable carrier that can be independently actuated, allowing selective deployment of cleaning elements while maintaining fluid flow paths between them.
Solution Approach 2:
The scraper blades are designed to be dynamically deployable and retractable during operation. The blades can be extended into the casing when cleaning is needed and retracted when not in use, allowing the tool to maintain multiple functions throughout its deployment cycle without permanent obstruction of fluid flow.
2Productivity
If single-use deployment mechanism is used, then scraper blades are deployed for cleaning, but multiple trips and tools are required for multiple scraping operations
Solution Approach 1:
Instead of discarding the cleaning tool after a single use, the system recovers and re-deploys the same tool for multiple cleaning operations. The scraper blades are retracted after each cleaning pass and the tool is pulled back through the casing, then redeployed for additional cleaning cycles, eliminating the need for multiple tool trips.
Solution Approach 2:
The cleaning tool maintains continuous utility through multiple deployment cycles. By retracting the scraper blades after each cleaning operation and keeping the tool in place, the system enables continuous useful action across multiple scraping operations without requiring tool retrieval and replacement.
3Reliability
If scraper blades are permanently deployed, then cleaning contact is maintained, but tool complexity and inability to retract increases
Solution Approach 1:
The patent replaces complex mechanical deployment mechanisms with simpler actuation systems. Magnetic actuators and hydraulic/pneumatic cylinders provide reliable blade deployment and retraction with fewer moving parts, reducing overall device complexity while maintaining dependable cleaning contact.
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
Facilitates efficient, multi-cycle wellbore cleaning with reduced wear on scraper blades and casing, allowing for continuous operations without blocking the tool's interior passage.
Implementation Method 1
magnetic mechanisms for blade deployment and retraction
Data Source
AI summary
A downhole tool for cleaning a wellbore, the tool including a tool body having a flowpath therethrough. A liquid is configured to flow through the flowpath and may have an intermittent flow pattern. An inner sleeve positioned within the tool body includes a recess having a recess pattern. In response to the intermittent flow pattern, a shift pin positioned in the recess of the inner sleeve traverses through the recess pattern. The downhole tool includes at least one scraper blade. The scraper blade is movable between a retracted position and a radially expanded position. In response to the shift pin traversing the recess pattern of the recess, the scraper blade can be expanded radially outward toward a wall of the wellbore from the retracted position to the expanded position and/or retracted inward away from the wall of the wellbore from the expanded position to the retracted position.