Threaded PCD Cutter Attachment for Field-Replaceable Drill Bits

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Solution Overview

Problem

Conventional methods for attaching polycrystalline diamond compacts (PDCs) to components, such as brazing or interference fitting, lead to thermal damage and make field repairs difficult due to the need for specialized facilities, causing delays and increased costs.

Innovation Solution

The introduction of polycrystalline diamond bodies with threads that allow for threadedly attachment to components without metallurgical bonds or interference fits, enabling easier detachment and replacement in the field.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If press-fitting or brazing methods are used to attach PDCs to bit body or support ring, then the attachment is secure and durable, but the repair process becomes difficult and may cause thermal damage to the PDCs

Engineering Contradiction:

Improveattachment strengthVSAvoidfield repair difficulty

Core Design Contradiction:

StrengthVSEase of repair

Solution Approach 1:

The attachment system is segmented into two independent components: the PDC with external threads and the bit body/support ring with internal threads. This segmentation allows the PDC to be detached and replaced independently without affecting the integrity of the bit body or support ring, enabling easy field repairs while maintaining secure attachment during operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent replaces the metallurgical bonding system (brazing) or interference fit system (press-fitting) with a mechanical thread engagement system. This substitution eliminates the need for thermal processes that cause damage and for specialized facilities, allowing simple mechanical assembly and disassembly in the field using basic tools.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If brazing or press-fitting methods are used to attach PDCs, then the attachment is secure, but specialized facilities are required for repair causing delays and increased costs

Engineering Contradiction:

Improveattachment reliabilityVSAvoiddowntime for repairs

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

By segmenting the attachment system into threaded components, the PDC can be independently removed and replaced in the field without requiring specialized facilities. This enables immediate repair operations that restore equipment reliability while minimizing downtime and avoiding the need for costly facility visits.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The threaded attachment system enables field personnel to perform repairs using basic tools and skills already available on drilling rigs, without requiring specialized brazing equipment or facilities. This self-service capability eliminates downtime associated with transporting equipment to specialized facilities and significantly reduces repair costs.

Inventive Principle:

Principle #25Self-service

3Ease of repair

If threads are formed on the PCD body, then field repairs become easy and thermal damage is prevented, but the manufacturing process becomes more complex

Engineering Contradiction:

Improvefield repairabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

Ease of repairVSDevice complexity

Solution Approach 1:

Threads are pre-formed on the PDC during the HPHT manufacturing process itself, rather than being added as a separate post-processing step. This preliminary action integrates the threading operation into the existing manufacturing workflow, minimizing additional complexity while enabling easy field repairs and preventing thermal damage through mechanical rather than thermal attachment methods.

Inventive Principle:

Principle #10Preliminary action

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

This solution prevents thermal damage and facilitates field repairs by allowing for secure, threadedly attachment and detachment of PDCs, reducing downtime and costs associated with specialized facility visits.

Implementation Method 1

The substrates and volume of diamond particles are then processed under HPHT conditions in the presence of a catalyst material that causes the diamond particles to bond to one another to form a matrix of bonded diamond grains

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

The diamond table may be formed and bonded to a substrate using a high-pressure, high-temperature ('HPHT') process

Methodology Applied

Scientific EffectHigh-pressure high-temperature bonding:

Data Source

PatentUS12037851B2Polycrystalline diamond bodies including one or more threads, apparatuses including the same, and methods of forming and using the same

Publication Date: 2024.07.16 US SYNTHETIC CORP

AI summary

An example PCD body includes a top surface, a bottom surface opposite the top surface, and at least one lateral surface extending between the top surface and the bottom surface. The PCD body includes one or more threads that are configured to allow the PCD body to be threadedly attached to a component, such as a substrate, a drill bit body, or a support ring. In an embodiment, the one or more threads may be formed on at least a portion of the lateral surface.