Drill Bit Formation-Engaging Element Placement
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Solution Overview
Problem
Earth-boring tools face challenges in optimizing the placement and aggressivity of formation-engaging elements relative to cutting elements to enhance drilling efficiency and control, particularly in directional drilling applications where precise angle and depth control are crucial.
Innovation Solution
The placement of formation-engaging elements is determined by a specific equation that considers the angle between these elements and cutting elements, target rate of penetration, and rotation speed, allowing them to be recessed from the cutting profile by a calculated distance to achieve optimal contact and control during drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If formation-engaging elements are positioned at the same radial distance as cutting elements, then directional control and depth of cut control are improved, but cutting aggressivity becomes difficult to optimize
Solution Approach 1:
The patent applies local quality by positioning formation-engaging elements at the same radial distance as cutting elements to provide consistent depth of cut control, while allowing these elements to have different aggressivity characteristics (lower aggressivity) to perform specific functions such as preventing rubbing and providing formation contact without excessive cutting action
2Manufacturing precision
If formation-engaging elements are recessed from the cutting profile, then depth of cut control is improved, but contact with formation and drilling efficiency may be reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the recess distance parameter based on the angle between formation-engaging elements and cutting elements, the rate of penetration, and rotation speed. This mathematical relationship ensures the formation-engaging elements are recessed by the precise amount needed to control depth of cut while maintaining adequate formation contact for drilling efficiency
3Productivity
If cutting elements have high aggressivity, then rate of penetration increases, but wear and directional control become difficult to manage
Solution Approach 1:
The patent applies segmentation by dividing the formation-engaging functions into two distinct types of elements: cutting elements with high aggressivity for rate of penetration, and formation-engaging elements with lower aggressivity for wear control and directional stability. This segmentation allows each element type to be optimized for its specific function without compromise
Data Source
AI summary
Earth-boring tools include a cutting element positioned on a drill bit body at a radial distance from a longitudinal axis thereof. At least two formation-engaging elements are positioned at the same radial distance from the longitudinal axis as the cutting element. The formation-engaging elements are recessed from a cutting profile of the cutting element by a distance within about 10% of d, wherein d=(α*x)/(1800*y), where α is an angle between the formation-engaging element and the cutting element, x is a rate of penetration of the drill bit body, and y is a rotation speed of the drill bit body. Additional earth-boring tools include at least one cutting element and at least two formation-engaging elements recessed from a cutting profile of the at least one cutting element at a common angle. Methods relate to forming such earth-boring tools.