Repairable Hardfaced Gauge Pads for Fixed-Cutter Matrix Bits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fixed-cutter matrix drill bits have non-repairable gauge pads due to their hardness, leading to scrapage when damaged, which reduces their operational life and increases maintenance costs.
Innovation Solution
The implementation of gauge pads with a hardfaced exterior surface made from a composite material comprising reinforcing agents like tungsten, niobium, and binding agents like copper, which can be fused during the infiltration process or applied post-manufacturing, allowing for repair through hardfacing techniques such as oxyfuel welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TSP elements are used to provide wear-resistance to gauge pads, then wear-resistance is improved, but repairability deteriorates
Solution Approach 1:
The gauge pad is segmented into two functional layers: a hard TSP layer for wear resistance and a softer matrix bit body for repairability. This segmentation allows each layer to perform its specialized function independently, resolving the contradiction between wear resistance and repairability
Solution Approach 2:
The gauge pad is constructed as a composite structure combining TSP elements embedded in a matrix bit body material. This composite approach integrates the advantages of both materials - the extreme hardness of TSP for wear resistance and the relative ease of working with the matrix material for repair capabilities
2Duration of action of moving object
If gauge pads are made extremely hard for durability, then service life is improved, but manufacturability and repairability deteriorate
Solution Approach 1:
The TSP elements are pre-formed and then embedded into the matrix bit body during the manufacturing process. This preliminary formation of the hard wear-resistant layer before final assembly allows the gauge pads to achieve extreme hardness for extended service life while maintaining manufacturability through a structured manufacturing sequence
Solution Approach 2:
The composite construction of TSP elements in a matrix material allows the gauge pads to achieve the extreme hardness needed for durability while the matrix material provides manufacturability and repairability, resolving the contradiction between service life and ease of manufacture
3Strength
If TSP elements are used in gauge pads, then hardness is improved, but adaptability for repair processes deteriorates
Solution Approach 1:
The gauge pad structure is segmented into a hard TSP surface layer and a softer matrix bit body substrate. This segmentation allows the hard TSP layer to provide the necessary hardness for wear resistance while the softer substrate provides adaptability for various repair processes
Solution Approach 2:
The matrix bit body material acts as an intermediary between the hard TSP elements and the repair processes. This intermediary material provides a workable substrate that can be easily shaped, welded, or modified during repair while supporting the hard TSP elements
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 extends the life of fixed-cutter matrix drill bits by enabling repair of damaged gauge pads, reducing waste and maintenance costs, and maintaining wellbore diameter precision.
Implementation Method 1
The matrix powder material is then metallurgically bonded with a metallic binder, for example, a copper alloy, during an infiltration process in the mold to form the matrix composite material
Implementation Method 2
allowing for repair through hardfacing techniques such as oxyfuel welding
Data Source
AI summary
Fixed-cutter matrix bits comprising hardfaced elements on the gauge pads, and methods of manufacture and using. An example fixed-cutter matrix bit comprises a matrix bit body, a plurality of cutter elements secured at fixed locations to the matrix bit body, and a plurality of gauge pads disposed on the matrix bit body; wherein at least one of the gauge pads includes a hardfaced exterior surface. The hardfaced exterior surface may comprise a material selected from the group consisting of tungsten, niobium, vanadium, molybdenum, silicon, titanium, tantalum, zirconium, chromium, yttrium, boron, carbon, carbides thereof, nitrides thereof, borides thereof, oxides thereof, silicides thereof, and combinations thereof. The hardfaced exterior surface may be fused to the at least one gauge pad during the infiltration process of manufacturing the matrix bit body.