Rotatable Cutting Element Assembly for Even Wear in Earth-Boring Tools

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Solution Overview

Problem

Existing earth-boring tools with fixed cutting elements suffer from reduced efficiency due to damage from high temperatures, axial loads, and impact forces, leading to premature wear and increased maintenance costs, as only a portion of the cutting edge engages the formation, resulting in inefficient drilling operations.

Innovation Solution

A rotatable cutting element with a stationary and rotatable portion, where the rotatable portion includes a spindle and a cutting table, secured by a retaining element made of a shaped memory alloy or spring-like material, allowing for even wear distribution and improved engagement with the formation, and a method of assembling the cutting element using a temperature-controlled process to secure the rotatable portion within the stationary portion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional fixed-cutter bits are used with PDC cutting elements, then the cutting edge can engage the formation, but the cutting element is subjected to high impact forces and temperatures causing damage such as chipping and spalling

Engineering Contradiction:

Improvecutting element durabilityVSAvoidimpact forces and temperatures

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The cutting element is designed with a rotatable portion that can rotate about the longitudinal axis during drilling operations. This dynamic capability allows the cutting edge to self-adjust and distribute wear more evenly, reducing the impact of high forces and temperatures on any single point of the cutting edge, thereby preventing chipping and spalling

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The cutting element is divided into a stationary portion and a rotatable portion. The rotatable portion includes a cutting table that can rotate independently, separating the function of engagement from the function of wear distribution, allowing the cutting edge to maintain reliability under harsh conditions

Inventive Principle:

Principle #1Segmentation

2Productivity

If conventional fixed-cutter bits are used, then the cutting element can be secured to the bit body, but only a portion of the cutting edge engages the formation leading to wear flats and decreased efficiency

Engineering Contradiction:

Improvedrilling efficiencyVSAvoidcutting edge wear

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The rotatable cutting element can rotate about its longitudinal axis during drilling, allowing the entire cutting edge to engage the formation uniformly rather than just a portion. This dynamic rotation prevents the formation of wear flats and maintains cutting efficiency throughout the operational life of the element

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The rotatable portion ensures continuous and uniform engagement of the cutting edge with the formation. By allowing rotation, the entire circumference of the cutting edge continuously contacts the formation material, maximizing the useful action and preventing localized wear that would decrease productivity

Inventive Principle:

Principle #20Continuity of useful action

3Duration of action of moving object

If conventional fixed-cutter bits are used, then the cutting element can be secured with braze alloy, but the cutting element cannot be rotated to present unworn portions, requiring bit replacement

Engineering Contradiction:

Improvecutting element lifeVSAvoidcutting element configuration

Core Design Contradiction:

Duration of action of moving objectVSEase of manufacture

Solution Approach 1:

The cutting element incorporates a rotatable portion that can rotate about the longitudinal axis while secured to the bit body via braze alloy. This dynamic feature allows the cutting element to present unworn portions to the formation continuously, extending the duration of action without requiring bit replacement, while the secured configuration remains manufacturable

Inventive Principle:

Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The rotatable cutting element extends the operational life of the cutting element and the earth-boring tool by evenly distributing wear, reducing damage from debris, and preventing binding issues, thereby reducing maintenance costs and improving drilling efficiency.

Implementation Method 1

The rotatable cutting element includes a retaining element extending between the rotatable portion and the stationary portion, the retaining element comprising a shaped memory alloy

Methodology Applied

Scientific EffectShape memory alloy: Shape Memory Alloy

Data Source

PatentUS12258815B2Earth-boring tools including rotatable cutting elements, rotatable cutting elements, and associated components and methods

Publication Date: 2025.03.25 BAKER HUGHES OILFIELD OPERATIONS LLC

AI summary

A rotatable cutting element includes a stationary portion defining a cavity with an inner wall, the inner wall extending at an angle radially away from a longitudinal axis of the stationary portion and defining a retaining region. The rotatable cutting element further includes a rotatable portion having one end thereof disposed in the cavity of the stationary portion and structure for engaging a subterranean formation at an opposing end. The rotatable cutting element also includes a retaining element extending between the rotatable portion and the stationary portion, the retaining element extending into the retaining region defined by the inner wall of the stationary portion.