Drill Rod Internal Fluid Bypass Grooves
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Solution Overview
Problem
Undesirable fluid pressure accumulation at the distal end of the drill string during drilling operations, particularly in up-hole drilling, poses challenges during tool retrieval and fluid management.
Innovation Solution
A drill rod with internal fluid bypass porting, featuring longitudinally extending grooves that allow axial fluid flow, enabling the relief of fluid buildup by permitting fluid to bypass through the drill rod as the inner assembly engages and disengages, thereby reducing fluid drag and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the drill string is sealed to prevent fluid leakage during drilling, then fluid loss is reduced, but fluid pressure accumulates at the distal end causing backpressure
Solution Approach 1:
The drill rod is segmented into multiple chambers by transverse partitions, with grooves creating additional flow pathways. This segmentation allows fluid to be divided and redirected through multiple routes, enabling pressure relief while maintaining overall sealing integrity of the drill string.
Solution Approach 2:
The grooves act as intermediary fluid bypass channels between the sealed drilling fluid pathway and the external environment. These grooves provide a controlled intermediate pathway for fluid to escape pressure buildup without compromising the primary sealing system.
2Stress or pressure
If grooves are added to the drill rod to enable fluid bypass, then fluid pressure is relieved, but structural strength is reduced
Solution Approach 1:
Rather than creating large continuous openings that would severely compromise strength, the fluid bypass path is segmented into multiple smaller grooves distributed around the drill rod circumference. This segmentation maintains structural integrity while providing sufficient total bypass area for pressure relief.
Solution Approach 2:
The grooves are positioned at specific locations and depths optimized to provide pressure relief functionality while minimizing impact on overall structural strength. The local modification is concentrated where needed for fluid bypass while preserving strength in critical load-bearing regions.
3Ease of operation
If the inner assembly is advanced and retracted within the drill rod, then drilling operations are enabled, but fluid drag increases due to pressure accumulation
Solution Approach 1:
The grooves serve as intermediary bypass channels that reduce fluid drag on the inner assembly by providing alternative flow pathways. This allows drilling fluid to bypass the moving inner assembly more efficiently, reducing the energy required to advance and retract it.
Solution Approach 2:
The harmful fluid pressure buildup is extracted from the system through the groove bypass pathways. By removing the excess pressure that would otherwise create drag, the inner assembly can be advanced and retracted with reduced energy loss.
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 effectively reduces fluid pressure on tooling during drilling operations, preventing inner tube expulsion and minimizing the need for holdback brakes, while allowing efficient fluid management during both insertion and retrieval processes.
Implementation Method 1
the at least one longitudinally extending groove of the body of the drill rod can be configured to permit axial flow of fluid through the drill rod as portions of the inner assembly engage the inner surface of the body of the drill rod
Data Source
AI summary
A drill rod can include a body having an outer surface, an inner surface, a longitudinal axis aligned with a drilling axis, and at least one longitudinally extending groove extending radially outwardly from the longitudinal axis relative to the inner surface. The inner surface and the at least one longitudinally extending groove can cooperate to define an interior space through which an inner assembly can be received as the inner assembly is advanced and retracted relative to the drilling axis. The at least one longitudinally extending groove of the body of the drill rod can be configured to permit axial flow of fluid through the drill rod as portions of the inner assembly engage the inner surface of the body of the drill rod.