Bearing Apparatus Lateral Spacing for Thrust Load Management
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Solution Overview
Problem
Subterranean drilling systems face challenges with the operational lifetime of thrust-bearing apparatuses due to high off-bottom and on-bottom thrust loads, which affect the efficiency and longevity of drilling operations.
Innovation Solution
The design of bearing apparatuses with specific lateral spacing between bearing elements, including a first and second bearing assembly with unique spacing configurations and flow obstruction elements to enhance fluid flow and lubrication, allowing for improved load distribution and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If bearing elements are placed closer together to increase load-bearing capacity, then the thrust-bearing apparatus can handle higher thrust loads, but the operational lifetime decreases due to increased wear and heat generation
Solution Approach 1:
The bearing apparatus is divided into multiple bearing elements spaced apart laterally, with each element handling a portion of the thrust load. This segmentation allows the load to be distributed across multiple discrete contact points rather than concentrated in a continuous surface, reducing wear at any single point and extending operational lifetime while maintaining high load capacity.
Solution Approach 2:
The bearing elements are positioned at specific lateral spacings optimized for their function - close enough to distribute load effectively but spaced to allow fluid flow and heat dissipation between them. This local optimization of spacing creates different functional zones within the bearing apparatus, with bearing surfaces designed for load support and spaced regions designed for cooling and lubrication.
2Duration of action of moving object
If bearing elements are spaced farther apart to reduce wear, then operational lifetime increases, but the thrust load capacity decreases
Solution Approach 1:
Multiple bearing elements are combined in a circumferential arrangement around the rotor-stator interface. While each individual element is spaced apart to reduce wear, the collective arrangement of multiple elements provides sufficient total bearing surface area to support high thrust loads. The merging of multiple discrete bearing elements creates a composite bearing system that achieves both wear reduction and high load capacity.
Solution Approach 2:
The bearing elements are arranged in a circumferential dimension around the rotor-stator interface rather than being distributed only in the axial direction. This dimensional arrangement allows the bearing apparatus to handle thrust loads through a distributed circular pattern of contact points, increasing the effective bearing area and load capacity while maintaining lateral spacing between individual elements for wear reduction.
3Force
If bearing elements are placed closer together to maximize bearing surface area, then load distribution improves, but fluid flow and lubrication effectiveness decrease
Solution Approach 1:
The bearing surface is segmented into multiple discrete bearing elements with gaps between them, rather than using a continuous bearing surface. This segmentation allows drilling fluid to flow through the gaps between bearing elements, providing continuous lubrication and cooling while still maintaining sufficient total bearing surface area for effective load distribution across all elements.
Solution Approach 2:
Drilling fluid is utilized to flow through the spaces between bearing elements, providing hydraulic lubrication and cooling. The fluid flow through the bearing element gaps creates a hydrodynamic lubrication regime that reduces friction and wear, while also removing heat generated during operation. This hydraulic approach enables the bearing elements to be spaced apart sufficiently to allow effective fluid flow.
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 bearing apparatuses provide enhanced operational longevity and efficiency by optimizing load distribution and fluid flow, leading to increased durability and performance in subterranean drilling systems.
Implementation Method 1
bearing elements 120 that may be fabricated from polycrystalline diamond compacts (PDCs) that provide diamond bearing surfaces that bear against each other during use
Implementation Method 2
The operational lifetime of the thrust-bearing apparatuses often determines the useful life of the subterranean drilling system 100
Implementation Method 3
a portion of the drilling fluid is diverted by the downhole drilling motor 104 to cool and lubricate the bearing elements 120 of the thrust-bearing apparatus 108
Implementation Method 4
a portion of the drilling fluid is diverted by the downhole drilling motor 104 to cool and lubricate the bearing elements 120
Data Source
AI summary
In an embodiment, a bearing apparatus comprises a first bearing assembly including a plurality of circumferentially-spaced first bearing elements each of which includes a first bearing surface. The bearing apparatus further includes a second bearing assembly including a plurality of circumferentially-spaced second bearing elements each of which includes a second bearing surface oriented to engage the first bearing surfaces of the first bearing assembly during operation. At least one of the second bearing elements may be circumferentially spaced from an adjacent one of the second bearing elements by a lateral spacing greater than a lateral dimension of the at least one of the second bearing elements.