Stepped PDC Cutter Elements for Higher Drill Bit Penetration
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Solution Overview
Problem
Existing fixed cutter drill bits face challenges in cutting efficiency and durability, leading to increased drilling time and costs due to frequent bit changes, which are influenced by the cutting efficiency and exposed surface area of the cutter elements.
Innovation Solution
The drill bit design incorporates cutter elements with non-planar cutting faces featuring multiple cutting edges and orientations to enhance cutting efficiency and durability, including a primary and secondary cutting surface configuration to improve engagement with the formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cutter elements with single cutting edge are used, then the structure is simple and easy to manufacture, but the cutting efficiency and durability are reduced
Solution Approach 1:
The cutting face of the cutter element is segmented into multiple cutting edges (primary, secondary, and tertiary cutting edges) arranged at different positions and orientations. This segmentation allows each edge to engage the formation at different stages of rotation, maintaining continuous cutting action and improving overall cutting efficiency without requiring complete replacement of the cutter element
Solution Approach 2:
The invention transitions from a single-planar cutting edge to a multi-dimensional cutting face structure with edges positioned at different heights, angles, and radial distances from the cutter element axis. This dimensional expansion creates multiple cutting surfaces that engage the formation at different points in the rotation cycle, significantly enhancing cutting efficiency
2Productivity
If cutter elements with larger exposed surface area are used, then the cutting efficiency is improved, but the durability and lifespan are reduced due to faster wear
Solution Approach 1:
The cutting face is divided into multiple cutting edges that can wear independently. As primary cutting edges wear, secondary and tertiary edges remain intact and can continue cutting, effectively extending the operational life of the cutter element while maintaining high rate of penetration throughout its service life
Solution Approach 2:
The design allows progressive discarding of worn cutting edges while recovering functionality through the use of remaining unused edges. The cutter element is not discarded entirely after one edge wears, but continues to perform through secondary edges, maximizing utilization of the cutter element material
3Duration of action of stationary object
If multiple cutting edges are added to cutter elements, then the lifespan is extended, but the manufacturing complexity and cost increase
Solution Approach 1:
Multiple cutting edges are pre-formed on the cutter element during manufacturing at different positions and orientations. This preliminary action ensures that when the drill bit is deployed, multiple functional edges are already available, extending lifespan without requiring complex field adjustments or replacements
Solution Approach 2:
The invention varies geometric parameters of the cutting face (edge positions, angles, radial distances, and orientations) to create multiple cutting edges from a single cutter element body. These parameter variations are achieved through controlled manufacturing processes that shape the cutting face geometry, extending lifespan through design optimization rather than material quantity increase
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 improved cutter element design enhances cutting efficiency and extends the drill bit's lifespan, reducing the frequency of bit changes and lowering drilling costs by maintaining a high rate of penetration and increasing the effective diamond surface area during drilling.
Implementation Method 1
each cutter element typically has a hard cutting layer of polycrystalline diamond or other superabrasive material
Implementation Method 2
The drilling fluid exiting the face of the bit through nozzles or ports performs several functions. In particular, the fluid removes formation cuttings (for example, rock chips) from the cutting structure of the drill bit
Implementation Method 3
Still further, the drilling fluid removes heat, caused by contact with the formation, from the cutter elements to prolong cutter element life
Implementation Method 4
the drilling fluid removes heat, caused by contact with the formation, from the cutter elements
Data Source
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AI summary
A cutter element for a fixed cutter drill bit (100) configured to drill a borehole (20) in a subterranean formation (90) includes a base (210) having a central axis, a first end (210a), a second end (210b), and a radially outer cylindrical surface extending axially from the first end to the second end. In addition, the cutter element includes a cutting layer (220) fixably mounted to the first end (210) of the base. The cutting layer includes a stepped cutting face (221) distal the base and a radially outer cylindrical surface extending axially from the cutting face to the radially outer cylindrical surface of the base. The radially outer cylindrical surface of the cutting layer is contiguous with the radially outer cylindrical surface of the base. The stepped cutting face includes a first step (230), a second step (240) axially spaced from the first step, and a riser axially positioned between the first step and the second step. The first step is axially positioned between the riser and the base.