Concentric Alignment Drill Bit Inserts Prevent Casing Wear
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Solution Overview
Problem
Drill bits experience premature wear and misalignment when drilling through fracturing plugs in horizontal wellbores due to their larger working face diameter compared to the casing or tubing, leading to inefficient drilling operations.
Innovation Solution
The use of inserts or blade packages with a larger cross-sectional area than the drill bit, positioned on the drill bit shank or centralizing subs, to elevate the drill bit off the inner surface of the casing or tubing, aligning it with the fracturing plug and preventing wear, while also incorporating features to break up fracturing plug remnants effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drill bit working face diameter is larger than the casing or tubing diameter, then the drill bit can effectively drill through fracturing plugs, but the drill bit contacts and wears against the inner surface of the casing or tubing
Solution Approach 1:
A centralizing sub with inserts is introduced as an intermediary component between the drill bit and the casing/tubing. The inserts on the centralizing sub contact the inner surface of the casing or tubing, while the drill bit working face remains elevated and does not contact the casing. This mediator allows the drill bit to maintain its larger diameter for effective fracturing plug drilling while preventing direct contact with the casing that would cause wear.
2Productivity
If the drill bit working face diameter is larger than the casing or tubing diameter, then the drill bit can drill through formations effectively, but the drill bit becomes misaligned with the fracturing plug in horizontal wellbores
Solution Approach 1:
The centralizing sub with inserts serves as a mediator that restores proper alignment. The inserts contact the casing or tubing inner surface at specific locations, positioning the drill bit centrally within the casing/tubing assembly. This ensures the drill bit axis aligns with the fracturing plug center, enabling effective drilling despite the drill bit's larger working face diameter.
3Reliability
If inserts are added to the drill bit or centralizing sub, then the drill bit is elevated off the casing surface and aligned properly, but the device complexity increases
Solution Approach 1:
The centralizing sub with inserts performs multiple functions simultaneously: it centers the drill bit within the casing/tubing, elevates the drill bit working face off the inner surface, and provides alignment for fracturing plug drilling. By consolidating these functions into a single component rather than adding separate devices, the overall device complexity is minimized while achieving the desired protective and alignment effects.
Data Source
AI summary
A concentric alignment device is provided that elevates the working face of a drill bit off of the inner wall of a casing or tubing to prevent premature wear of the working face of the drill bit. In horizontal drilling applications, the working face of a drill bit has a tendency to contact or rest on the inner wall of a casing or tubing, which negatively affects the working face of a drill bit. In some embodiments, one or more optional inserts are provided on the shank of a drill bit or on a centralizing sub such that the inserts contact the inner wall of a casing or tubing instead of the working face of the drill bit. In other embodiments, blade packages on a drill bit or sub contact the inner wall of a casing or tubing and also pump drilling fluid in a downhole direction.