Resilient Cutter Support for Consistent Downhole Drilling
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Solution Overview
Problem
Existing cutting element assemblies in downhole drilling experience issues with uneven contact length and force, leading to inconsistent chip size and spacing, which affects drilling efficiency.
Innovation Solution
Incorporating a resilient element into the cutter support that is integrally formed with the cutting element assembly, allowing for compression and absorption of forces, thereby maintaining consistent contact and force application during drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rigid cutting element assembly is used, then structural strength is maintained, but contact length and force become uneven leading to inconsistent chip size
Solution Approach 1:
The patent changes the mechanical parameter of the cutter support from rigid to resilient by incorporating a resilient element. This resilient element can compress and deform under load, allowing the cutting elements to maintain consistent contact with the formation despite variations in formation hardness and depth, thereby producing uniform chip size while retaining sufficient structural strength.
Solution Approach 2:
The patent introduces dynamic behavior to the cutter support through the resilient element that can compress and rebound. This dynamic capability allows the cutting elements to adapt their contact pressure in real-time based on formation conditions, ensuring consistent chip production while maintaining the necessary structural integrity during drilling operations.
2Manufacturing precision
If cutting elements are rigidly fixed, then force application is high, but contact length varies causing uneven chip spacing
Solution Approach 1:
The resilient element changes the mechanical parameter from rigid fixation to compliant connection. This allows the cutting elements to maintain optimal contact force with the formation while the resilient element absorbs variations in contact length, resulting in uniform chip spacing through consistent force application across all cutting elements.
3Reliability
If resilient element displacement is large, then contact consistency is improved, but structural stability decreases
Solution Approach 1:
The patent optimizes the resilient element's displacement parameter to achieve the right balance. The resilient element is designed to provide sufficient displacement (greater than 0.1 mm) to maintain contact consistency while remaining within limits that preserve structural stability. The element's material properties and geometric configuration are tuned to deliver reliable contact while preventing excessive movement that would compromise stability.
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 resilient element enhances drilling efficiency by ensuring consistent contact length and force application, resulting in more uniform chip size and reduced spacing, thus improving the rate of penetration and overall drilling performance.
Implementation Method 1
A resilient element is integral with the cutter support. The resilient element is longitudinally compressible along a length of the cutter bore. The resilient element has a displacement of greater than 0.1 mm.
Implementation Method 2
The resilient element is compressible based on a force applied to the cutter support through one or more of the plurality of cutting elements.
Data Source
AI summary
A cutting element assembly includes a cutter support including a cutter bore. A cutting element is in the cutter bore and a resilient element is integral with the cutter support. The resilient element is longitudinally compressible and has a displacement of greater than 0.1 mm and optionally less than 2 mm. Another cutting assembly includes a cutter support coupled to multiple cutting elements. A resilient element of the cutter support is compressible based on a force applied to the cutter support through one or more of the cutting elements. The resilient element can include a slit in the cutter support. A slit may, for instance, extend perpendicular or transverse to an axis of the cutting elements and allow the cutter support to flex and close off or reduce a size of the slit when forces act on one or more of the cutting elements.