Burn Shoe Bypass Channels for Washover Cooling and Debris Flow
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Solution Overview
Problem
Traditional washover operations face challenges in effectively cooling the cutting structure and elements due to restricted fluid flow, leading to increased temperatures and potential tool failure, especially when milling through packer elements and support shoes, which can result in debris clogging and reduced tool longevity.
Innovation Solution
Enhanced burn shoe design with angled cutter slots and bypass flow areas, including helical and straight flutes, to increase fluid flow and debris management, reducing the risk of temperature rise and tool failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional washover operations are performed with standard burn shoe design, then the annular clearance between wash pipe and casing is maintained, but fluid flow is restricted causing temperature increase and tool failure
Solution Approach 1:
The burn shoe is segmented with multiple bypass flutes (helical and straight) that divide the fluid flow path into multiple channels. This segmentation increases the total flow area and improves cooling efficiency by distributing coolant across multiple pathways, preventing localized overheating while maintaining structural integrity.
Solution Approach 2:
The invention adds a new dimension to fluid flow by incorporating bypass flutes that extend axially along the burn shoe. This creates a three-dimensional flow network rather than relying solely on radial flow through the annular clearance, significantly increasing cooling capacity without expanding the wash pipe outer diameter.
2Strength
If burn shoe OD is increased to mill through packer elements and support shoes, then cutting capability is improved, but annular clearance is reduced further restricting fluid flow
Solution Approach 1:
The bypass flutes segment the burn shoe structure into multiple zones that allow fluid to flow through the body of the tool. This creates internal flow passages that compensate for the reduced external annular clearance, maintaining cooling efficiency even with larger burn shoe diameter required for milling through tough materials.
Solution Approach 2:
The bypass flutes act as intermediary flow channels that mediate between the limited annular clearance and the high cooling demand. These flutes provide alternative pathways for coolant to reach the cutting structure, effectively bridging the gap between restricted external flow and internal cooling requirements.
3Duration of action of moving object
If milling operation duration is extended to retrieve equipment deeper in well, then operational effectiveness is improved, but temperature increase causes carbide cutter wear and bond failure
Solution Approach 1:
The bypass flutes ensure continuous coolant flow throughout the milling operation, maintaining constant cooling of the cutting structure. This continuous cooling action prevents temperature accumulation over extended operation periods, allowing prolonged milling through deep well equipment without thermal damage to carbide cutters or bonding material.
Solution Approach 2:
The bypass flute geometry is designed to deliver coolant to the cutting interface before significant heat generation occurs. The flutes are positioned and angled to provide advance cooling, preventing thermal buildup before it can compromise the cutting structure during extended operations.
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 enhanced design allows for longer milling operations, increased tool reusability, and reduced operational costs by maintaining lower operating temperatures and preventing debris packing, suitable for deep and high-temperature wells.
Implementation Method 1
fluid flow through one or more bypass channels disposed along an outer diameter of the first tubular, the first tubular during the cutting
Data Source
AI summary
Some implementations include an apparatus comprising a first tubular having a number of radial cutters disposed circumferentially along one end, wherein a cutter slot is formed between each pair of radial cutters. The apparatus further comprises a plurality of bypass channels disposed along an outer diameter of the first tubular, wherein each cutter slot leads into a bypass channel.