Fixed Cutter Drill Bit Segmented Cutting Structure
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Solution Overview
Problem
Current drill bits require multiple trips to switch between drilling through downhole components and the formation, which is time-consuming and costly, and existing fixed cutter drill bits often weaken the matrix bit body during welding, leading to damage and inefficiency.
Innovation Solution
A fixed cutter drill bit design with a composite matrix bit body and blades made of tungsten carbide infiltrated with a binder, featuring a tool cutting structure for drilling through downhole components and a formation cutting structure for drilling through rock, where the tool cutting structure wears away to expose the formation cutting structure, allowing a single trip through both materials without damaging the bit body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a single fixed cutter drill bit is used to drill through both downhole components and formation, then the number of trips is reduced, but the cutting structure must effectively handle two different materials with different properties
Solution Approach 1:
The cutting structure is segmented into two distinct parts: a tool cutting structure with harder, more brittle material for cutting through downhole components (metal, rubber), and a formation cutting structure with softer, more durable material for drilling through rock formations. This segmentation allows each part to be optimized for its specific function while using a single drill bit.
Solution Approach 2:
Different regions of the cutting structure have different material properties tailored to their specific cutting needs. The tool cutting structure uses harder material (e.g., carbide) for metal/rubber cutting, while the formation cutting structure uses softer material (e.g., PDC cutters) for rock drilling. This local quality differentiation enables effective handling of both material types without compromising overall bit performance.
2Strength
If welding is used to attach cutter elements to the matrix bit body, then the cutting structure can be secured, but the matrix bit body may be weakened and damaged
Solution Approach 1:
A binder material serves as an intermediary between the cutter elements and the matrix bit body. This binder distributes the mechanical and thermal stresses of welding across a larger area, preventing direct concentration of heat and force on the matrix bit body. The binder acts as a buffer that protects the matrix structure while still securing the cutter elements effectively.
Solution Approach 2:
The cutting structure uses composite material construction with cutter elements made of hard material (e.g., carbide) bonded to a softer matrix bit body through a specialized binder. This composite approach allows the hard cutter elements to provide cutting effectiveness while the softer matrix and binder protect against welding-induced damage, combining the benefits of both material types in a single integrated structure.
3Strength
If the tool cutting structure is made of harder material for drilling through metal and rubber, then it can effectively cut downhole components, but it may damage the softer matrix bit body during the process
Solution Approach 1:
The binder material serves as a protective intermediary between the hard tool cutting structure and the softer matrix bit body. This binder absorbs and distributes the mechanical shocks and stresses generated during cutting of downhole components, preventing direct transmission of damaging forces to the matrix structure while allowing the hard cutters to effectively penetrate metal and rubber.
Solution Approach 2:
The cutting structure employs a composite material system where hard cutter elements (e.g., carbide) are embedded in a softer, more ductile matrix bit body with specialized binder. This composite construction allows the hard cutters to maintain their cutting effectiveness against downhole components while the softer matrix and binder provide a cushioning effect that prevents damage to the overall bit structure during the cutting process.
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
Enables efficient drilling through both downhole components and rock formations in a single trip, maintaining the integrity of the matrix bit body and reducing operational time and costs by transferring cutting duties from the tool cutting structure to the formation cutting structure.
Implementation Method 1
heating the mold, the first binder and the second binder after (d) to melt the first binder and the second binder
Implementation Method 2
infiltrating the powdered matrix material with the melted second binder during (e)
Implementation Method 3
cooling the mold, the melted first binder, and the melted second binder to solidify the melted first binder and the melted second binder after (f)
Data Source
AI summary
A method for manufacturing a fixed cutter drill bit for drilling an earthen formation includes (a) providing a mold including a rigid body and a cavity extending from an upper end of the rigid body. The cavity includes a bit body recess, a plurality of circumferentially-spaced blade recesses extending from the bit body recess, and a tool cutting structure recess extending from each blade recess. In addition, the method includes (b) placing a first binder in each tool cutting structure recess. Further, the method includes (c) filling each blade recess and the bit body recess with a powdered matrix material comprising tungsten carbide after (b). Still further, the method includes (d) placing a second binder on top of the powdered matrix material after (c). The method also includes (e) heating the mold, the first binder and the second binder after (d) to melt the first binder and the second binder. Moreover, the method includes (f) infiltrating the powdered matrix material with the melted second binder during (e). Additionally, the method also includes (g) cooling the mold, the melted first binder, and the melted second binder to solidify the melted first binder and the melted second binder after (f) to form a bit body, a plurality of blades, and a tool cutting structure.