Bonded Diamond Compact Encapsulation for Downhole Wear Resistance

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Solution Overview

Problem

Existing bonded diamond compacts (BDCs) used in downhole tools face thermal instability issues due to mismatched thermal expansion and carbon graphitization, leading to reduced operating life and difficulty in attachment to tool components.

Innovation Solution

Encapsulating superhard materials like bonded diamond or cubic boron nitride with a thermally stable encapsulation layer, which provides a thermal barrier and improves interfacial strength, allowing for effective attachment via high isostatic pressure and brazing processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If bonded diamond compacts are used in downhole tools, then wear resistance is improved, but thermal stability deteriorates due to mismatched thermal expansion and carbon graphitization

Engineering Contradiction:

Improvewear resistanceVSAvoidthermal stability

Core Design Contradiction:

StrengthVSStability of the object's composition

Solution Approach 1:

The patent introduces an interstitial material layer between the bonded diamond compact and the metal matrix. This intermediary layer has a thermal expansion coefficient that matches both the diamond compact and the metal matrix, serving as a thermal expansion buffer that prevents stress concentration and graphitization at the interface during high-temperature operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite structure consisting of bonded diamond compact, interstitial material layer, and metal matrix. This multi-material composite design combines the wear resistance of diamond with the thermal stability of the interstitial layer and the structural strength of the metal matrix, resolving the contradiction between wear resistance and thermal stability.

Inventive Principle:

Principle #40Composite materials

2Strength

If high-temperature brazing is used to attach BDCs to downhole tool components, then attachment strength is improved, but thermal degradation of BDC increases

Engineering Contradiction:

Improveattachment strengthVSAvoidthermal degradation resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent applies a protective coating to the bonded diamond compact surface before the brazing process. This preliminary protective action prevents direct exposure of the diamond to high brazing temperatures, reducing carbon dissolution and graphitization during the attachment process while still allowing strong metallurgical bonding to occur.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The interstitial material layer serves as a thermal barrier and protective intermediary during the brazing process, shielding the bonded diamond compact from direct high-temperature exposure while still allowing the brazing operation to proceed and create strong attachments to the metal matrix.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If thermally unstable materials are used in BDCs, then ease of manufacture is improved, but operating life deteriorates due to carbon dissolution and graphitization

Engineering Contradiction:

Improvemanufacturing easeVSAvoidoperating life

Core Design Contradiction:

Ease of manufactureVSDuration of action of moving object

Solution Approach 1:

The patent modifies the chemical composition parameters of the interstitial material layer to create a carbon-resistant environment. By selecting materials with specific chemical properties that resist carbon dissolution at elevated temperatures, the patent extends the operating life of the BDC while maintaining manufacturability through conventional sintering and brazing processes.

Inventive Principle:

Principle #35Parameter changes

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 encapsulation layer enhances thermal stability, increases interfacial strength, and extends the operational life of BDCs by preventing thermal damage during hard-facing and brazing, while also improving attachment reliability to downhole tool components.

Implementation Method 1

The encapsulation layer enhances thermal stability, increases interfacial strength, and extends the operational life of BDCs by preventing thermal damage during hard-facing and brazing

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 2

an encapsulation material bonded to said substrate using a high isostatic pressure

Methodology Applied

Scientific EffectHigh isostatic pressure bonding: Hot Isostatic Pressing

Implementation Method 3

allowing for effective attachment via high isostatic pressure and brazing processes

Methodology Applied

Scientific EffectBrazing: Brazing

Data Source

PatentUS11136835B2Methods to attach highly wear resistant materials to downhole wear components

Publication Date: 2021.10.05 HALLIBURTON ENERGY SERVICES INC

AI summary

The present disclosure provides a system for improving wear resistance of a downhole tool component using a bonded diamond compact (BDC) construct. The BDC construct includes a BDC element and an encapsulation layer bonded to the BDC element. The encapsulation layer may fully encapsulate the BDC element. The downhole tool component may be a drill bit, push the bit pad, or mud motor beating assembly. The BDC construct may be disposed in a plug section of the downhole tool component. The encapsulation layer may form an insulating layer over the BDC element to protect the BDC element from thermal damage during hard-facing or brazing of the BDC construct to the downhole tool component.