Drill Bit Shearing and Gouging Cutting Elements
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Solution Overview
Problem
Existing earth-boring tools face challenges in efficiently cutting and enlarging wellbores due to limitations in cutting element design, particularly in combining shearing and gouging mechanisms effectively, which affects drilling efficiency and stability.
Innovation Solution
The use of a fixed-cutter rotary drill bit with a combination of shearing cutting elements and gouging cutting elements, where shearing cutting elements are mounted on the leading surface and gouging cutting elements act as backups or follow unique paths, enhancing cutting efficiency and stability by complementing each other's cutting actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If only shearing cutting elements are used, then cutting efficiency is improved, but tool stability deteriorates
Solution Approach 1:
The patent combines shearing cutting elements and gouging cutting elements on the same drill bit, allowing the shearing elements to provide efficient cutting while the gouging elements provide stability and support, thus resolving the contradiction between cutting efficiency and tool stability
2Stability of the object's composition
If only gouging cutting elements are used, then tool stability is improved, but cutting efficiency deteriorates
Solution Approach 1:
The patent merges shearing and gouging cutting elements in a coordinated arrangement where shearing elements perform the primary cutting action for efficiency while gouging elements provide stability, thus resolving the contradiction between tool stability and cutting efficiency
3Device complexity
If cutting elements are arranged in traditional configurations, then device complexity is reduced, but drilling performance deteriorates
Solution Approach 1:
The patent applies local quality by positioning shearing cutting elements at specific locations (e.g., on blades) and gouging cutting elements at other specific locations (e.g., on the body or as backup elements), allowing each type to perform its optimal function at the appropriate location, thus improving drilling performance while maintaining manageable complexity
Data Source
Figure 1
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AI summary
Earth-boring tools include a body, one or more blades projecting outwardly from the body, and cutting elements carried by the blade. The cutting elements include at least one shearing cutting element and at least one gouging cutting element. Methods of forming an earth-boring tool include mounting a shearing cutting element comprising an at least substantially planar cutting face to a body of an earth-boring tool, and mounting a gouging cutting element comprising a non-planar cutting face to the body of the earth-boring tool. The gouging cutting element may be positioned on the body of the earth-boring tool such that the gouging cutting element will gouge formation material within a kerf cut in the formation material by the shearing cutting element, or between kerfs cut in the formation material by a plurality of shearing cutting elements.