Segmented Oilfield Mill with Pressure-Actuated Stabilizer Blades
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Solution Overview
Problem
In the oilfield wellbore operations, existing technologies face challenges in accurately removing and repairing damaged casings due to their blind nature, requiring reliance on weight indicators and pump pressures without visual feedback, and struggle with centralization and stabilization, especially when dealing with multiple eccentric casings and debris.
Innovation Solution
A segmented tool body with pressure-actuated sequences for extending stabilizer and cutting blades, utilizing fluid pressure to engage and retract blades and stabilizers, allowing for precise cutting and milling of casings and debris while maintaining centralization, and adaptable for various downhole operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional mill tool is used to remove damaged casing, then the cutting operation can be performed, but the tool lacks centralization and stabilization capability, especially when dealing with multiple eccentric casings
Solution Approach 1:
The tool body is divided into multiple segments that can independently extend and retract. Each segment contains stabilization elements or cutting elements that can be deployed as needed, allowing the tool to adapt to different wellbore conditions while maintaining overall structural manageability
Solution Approach 2:
The tool incorporates movable segments that can extend and retract dynamically during operation. This dynamic capability allows the tool to maintain centralization and stabilization while performing cutting operations in eccentric multi-casing environments
2Stability of the object's composition
If the tool extends stabilization blades to maintain centralization, then the cutting operation stability improves, but the tool length increases which may prevent passage through restricted spaces
Solution Approach 1:
The stabilization blades are segmented and can extend only when needed during the cutting operation. The segmented design allows the blades to be stored compactly during tool assembly and deployment, then extended to provide stabilization during the actual cutting phase
Solution Approach 2:
The stabilization blades transition from a retracted state during tool assembly and deployment to an extended state during cutting operations. This dynamic extension allows the tool to maintain a compact profile when passing through restricted spaces while providing full stabilization capability when performing cutting operations
3Adaptability or versatility
If the tool is designed to mill through multiple eccentric casings, then the versatility improves, but the precision of cutting individual casing sections deteriorates
Solution Approach 1:
The cutting elements are arranged in segments that can be independently positioned and controlled. This segmentation allows the tool to target specific casing sections for removal while maintaining precision, even when operating in multi-casing environments with different eccentricities
Solution Approach 2:
Different segments of the tool can be configured with different properties suitable for different casing sections. The stabilization and cutting elements can be locally adjusted to match the specific requirements of each casing being milled, maintaining cutting precision across multiple eccentric casings
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 precise removal of damaged casings and debris, maintaining wellbore integrity by providing a centralized and stabilized cutting action, even in restricted spaces, with the ability to be configured for different operations and extended use as a centralizer or stabilizer for other tools.
Implementation Method 1
The present invention uses pump pressure of fluids through the inner diameter of the work string creating pressure on a piston that engages and extends cutting knives and stabilizer blades
Data Source
AI summary
The present invention provides a section mill/casing cutter/stabilizer apparatus and method featuring a segmented body that allows different pressure actuated sequences of extending stabilizer blades and cutting blades to cause the cutting and milling of wellbore casing and other debris in a wellbore. Applied pressure results in the flow through a flow restriction that creates a force on return springs associated with the centering and the cutting blades. The segmented body allows the manipulation of the blades and centralizers as needed. The spring returns a mandrel to the original retracted or run-in position on cessation or reduction of flow. The ability to vary the segments and sequences makes it easier to run the apparatus in conjunction with other milling and cutting tools, enhancing their performance through centralization and enlarging of cutting capacity.