Reusable Downhole Drill Bit Chassis With Interfacing Exchange Surfaces
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Solution Overview
Problem
Drill bits experience significant wear and damage during drilling operations, leading to increased costs and complexity due to the need for frequent replacements and instrumentation challenges.
Innovation Solution
A drill bit assembly design featuring a chassis housed within the drill bit, with interfacing exchange surfaces allowing for signal exchange and instrumentation, enabling the chassis to be easily removed and reused between drill bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If drill bits are instrumented with measurements and functions, then measurement and functional capabilities are improved, but replacement expense and complexity increase significantly
Solution Approach 1:
The drill bit is divided into separate functional components: a reusable instrumented body containing electronics and measurement devices, and replaceable cutting elements. This segmentation allows the instrumented body to be retained and reused while only the worn cutting elements are replaced, significantly reducing replacement complexity and expense while maintaining measurement capabilities.
Solution Approach 2:
The instrumented body is designed as a universal platform that can be adapted to different drill bit configurations and applications. The standardized interface and modular design allow the same instrumented body to serve multiple drill bits, reducing overall system complexity and enabling reuse across different drilling operations.
2Adaptability or versatility
If drill bits are instrumented to take measurements, then functional capabilities near the drill bit are improved, but wear and damage to the instrumented drill bit increase replacement frequency
Solution Approach 1:
By separating the instrumented body from the cutting elements, the design allows the durable instrumented body to remain in service while only the consumable cutting elements are replaced. This extends the functional service life of the instrumented component while maintaining the ability to replace worn cutting elements, effectively resolving the contradiction between functional capabilities and service life.
Solution Approach 2:
The design enables discarding only the worn cutting elements while recovering and reusing the expensive instrumented body. This selective replacement strategy maintains functional capabilities near the drill bit while significantly extending the service life of the instrumented components, reducing replacement frequency and expense.
3Measurement precision
If instrumentation is integrated into the drill bit, then measurement capabilities are improved, but replacement cost increases due to inability to reuse instrumentation
Solution Approach 1:
The drill bit is segmented into a reusable instrumented body and replaceable cutting elements. This segmentation enables the expensive instrumentation to be manufactured once and reused across multiple drill bit assemblies, significantly reducing replacement costs while maintaining improved measurement capabilities.
Solution Approach 2:
The instrumented body is designed as a universal component that can be installed on multiple drill bit configurations. This universality allows a single instrumentation platform to serve multiple purposes and drill bits, reducing the overall cost of instrumentation per drill bit while maintaining measurement capabilities.
Data Source
AI summary
A drill bit assembly, of a type useful for forming a borehole in the earth, may comprise a chassis, separate from a drill bit, housed within a cavity of the drill bit. A drill string may be secured to the drill bit and retain the chassis within the cavity. This chassis may comprise two pairs of interfacing exchange surfaces, a first pair disposed between the chassis and the drill string and a second pair disposed between the chassis and the drill bit. Both of the first pair are annular in shape and fixed together independent of rotational orientation. The second pair are fixed together in a specific rotational orientation. These pairs of interfacing exchange surfaces may allow for various types of signals, such as electrical, hydraulic, optical or electromagnetic for example, to be exchanged and passed through the chassis or to electronics disposed on the chassis.