Wellbore Reaming Tool with Asymmetric Gouging Cutters
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Solution Overview
Problem
Existing wellbore reaming tools with shear cutters often experience cutter breakage when used in certain subsurface earthen formations, necessitating improved tool longevity and performance.
Innovation Solution
A reaming tool design featuring a plurality of reaming blocks with at least two rows of gouging cutters, where the first row is rotationally ahead of the second row, providing a larger reaming diameter profile that increases with longitudinal position, thereby enhancing cutting coverage and tool longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shear cutters are used in reaming tools, then reaming capability is provided, but cutter breakage occurs in certain subsurface formations
Solution Approach 1:
The invention changes the geometric parameters of the cutters by transitioning from shear cutters to gouging cutters with different shapes (e.g., dome-shaped, cone-shaped, or ballistically shaped cutting faces). This parameter change allows the cutters to better withstand the mechanical stresses encountered in challenging rock formations, thereby improving reliability without sacrificing strength.
2Productivity
If single row of gouging cutters is used, then simpler structure is achieved, but insufficient cutting coverage results
Solution Approach 1:
The invention segments the cutting function by dividing the gouging cutters into multiple rows (first row and second row) on the reaming block. This segmentation allows each row to contribute to the overall cutting coverage, thereby increasing total productivity while maintaining a relatively simple and modular structure that is easy to manufacture and maintain.
Solution Approach 2:
The invention adds a rotational dimension to the cutter arrangement by positioning the first row rotationally ahead of the second row. This dimensional arrangement ensures that cutters in different rows engage the formation at different angular positions, thereby increasing cutting coverage without significantly increasing structural complexity.
3Productivity
If first row is rotationally ahead of second row with larger reaming diameter, then enhanced cutting coverage is achieved, but asymmetric configuration increases manufacturing complexity
Solution Approach 1:
The invention deliberately employs asymmetric configuration where the first row of gouging cutters is positioned rotationally ahead of the second row, and the first profile defines a larger reaming diameter than the second profile. This asymmetric arrangement optimizes cutting coverage and reaming performance by ensuring progressive engagement of cutters, while the modular reaming block design keeps manufacturing complexity manageable through standardized components and assembly procedures.
Data Source
AI summary
A reaming tool includes a reaming tool body configured to be coupled within a drill string or a string of drilling tools. A plurality of reaming blocks is attached to the reaming tool body at circumferentially spaced apart locations. At least one reaming block comprises at least a first row of gouging cutters and a second row of gouging cutters. The gouging cutters in the first row define a first profile. The gouging cutters in the second row define a second profile. The first row is rotationally ahead of the second row. The first profile at any longitudinal position along the at least one reaming block defines a larger reaming diameter than the second profile.