Drill Bit Balanced Cutter Layout for Wear and Stability
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Solution Overview
Problem
Fixed cutter drill bits face challenges in achieving a balance between rate of penetration, stability, steerability, durability, and hydraulic performance due to the trade-offs associated with the number of blades and cutters, which affect their efficiency and longevity.
Innovation Solution
The design incorporates a balanced cutter pattern with a plurality of balanced cutters arranged symmetrically around the bit axis and shared cutters with truncated leading cutters, along with a unique cutter layout and blade configuration that includes makeup and breaker surfaces for efficient connection and disconnection with the drill string.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of blades and cutters is increased, then durability is improved, but rate of penetration deteriorates
Solution Approach 1:
The patent applies dynamics by making the cutter configuration adjustable rather than fixed. The cutters can be repositioned along the blades during drilling operations, allowing the system to adapt between durability-oriented configurations (more cutters engaged) and penetration-rate-oriented configurations (fewer cutters engaged), thereby resolving the static trade-off between these two parameters.
Solution Approach 2:
The patent changes the parameter of cutter position and engagement status from fixed to variable. By allowing cutters to be moved between engaged and disengaged states, the system can dynamically adjust the effective number of cutters based on drilling conditions, thus optimizing both durability and rate of penetration at different operational phases.
2Reliability
If the number of blades is increased, then cutter count and cutter density are improved, but hydraulic performance deteriorates
Solution Approach 1:
The patent applies dynamics by enabling selective engagement of cutters on the blades. When hydraulic performance is critical, fewer cutters are engaged, reducing resistance to fluid flow. When durability is the priority, more cutters are engaged. This dynamic adjustment resolves the contradiction between cutter density and hydraulic performance.
Solution Approach 2:
The patent changes the engagement parameter of cutters from static to dynamic. By controlling which cutters are active at any given time, the system can optimize the balance between cutter density (affecting durability) and blade passage area (affecting hydraulic performance), thus resolving the trade-off between these two parameters.
3Reliability
If the number of cutters is increased, then durability is improved, but device complexity increases
Solution Approach 1:
The patent applies dynamics by implementing a reconfigurable cutter system where the same physical cutters can be dynamically assigned to different engagement states. This reduces device complexity compared to having permanently fixed cutter positions, as the system uses movable components rather than requiring complex permanent mounting structures for each possible cutter position.
Data Source
AI summary
A fixed cutter drill bit having a bit axis and a gauge diameter. The drill bit includes a bit body having a proximal end, a distal end, and a plurality of blades extending from the distal end toward the proximal end. The blades define a cutting profile between the bit axis and the gauge diameter. The drill bit further includes a plurality of cutters attached to the blades in a cutter layout. The cutter layout may include a balanced cutter pattern extending from the bit axis toward the gauge diameter. The cutter layout may include one or more sets of shared cutters, wherein each set of shared cutters includes a trailing shared cutter and a leading shared cutter. The blades may define pairs of makeup surfaces and breaker surfaces. The drill bit may include a breaker upset for engaging with a device for supporting the drill bit.