Hybrid Bit Wheel Support Shim Sealing
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Solution Overview
Problem
Existing downhole drilling bits face challenges in maintaining a tight fit between the wheel and the leading support, leading to infiltration of drilling fluid and debris, which reduces operational life and efficiency.
Innovation Solution
The implementation of a hybrid bit design with a wheel support structure that includes a leading and trailing support forming a wheel slot, where shims are used to fill the initial gap between the wheel and the leading support, ensuring a tight fit and preventing infiltration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a wheel support structure is used in a hybrid bit, then the bit can effectively remove formation material through both fixed blades and rotating wheels, but an initial gap forms between the wheel and leading support allowing infiltration of drilling fluid and debris
Solution Approach 1:
A shim is introduced as an intermediary component between the wheel and leading support structure. The shim fills the initial gap that forms during operation, preventing infiltration of drilling fluid and debris while allowing the wheel to maintain its cutting function. This mediator component resolves the contradiction by providing the necessary sealing without interfering with the wheel's rotational movement or cutting effectiveness.
Solution Approach 2:
The wheel support structure is segmented into distinct components: the leading support, the wheel, and the shim. This segmentation allows each component to be optimized independently - the wheel for cutting, the leading support for structural integrity, and the shim for sealing. The segmented design enables the shim to specifically address the infiltration problem without compromising the overall productivity of the hybrid bit.
2Reliability
If shims are added between the first flange and wheel support structure, then the initial gap is filled and infiltration is prevented, but the device complexity increases
Solution Approach 1:
The shim is designed as a simple, inexpensive component that can be easily replaced if needed. Rather than creating a complex adjustable sealing mechanism, the invention uses a straightforward shim that provides effective sealing through its basic presence in the gap. This approach prioritizes reliability through simplicity, accepting that the shim may need replacement over time rather than designing a permanently adjustable system.
3Manufacturing precision
If the wheel slot depth is increased to greater than or equal to the wheel diameter, then the wheel is better contained and aligned, but the manufacturing complexity of the bit body increases
Solution Approach 1:
The wheel slot depth is specified as a critical parameter - greater than or equal to the wheel diameter. This parameter change ensures proper wheel containment and alignment without requiring additional complex features. By setting the depth as a simple dimensional parameter rather than adding complex mechanical constraints, the invention achieves precise wheel positioning while maintaining relative manufacturing simplicity.
Data Source
AI summary
A hybrid bit includes fixed blades and wheel support structures. The wheel support structure includes a wheel inserted into a slot between a leading support and a trailing support. One or more shims fill a gap between a flange and the leading supports. An elongated seal between the wheel and the supports is provided to seal the wheel support.