Casing Roller Bearing Assembly for Friction Reduction
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Solution Overview
Problem
The challenge in hydrocarbon development operations is the wear and damage caused by friction between the casing string and the subterranean well's inner surface, leading to increased costs and potential stuck pipes, especially in extended reach and complex geometry wells with higher friction and irregular bore diameters.
Innovation Solution
A roller bearing assembly integrated with the casing string, featuring a bearing body with spherical bearings that reduce friction by allowing the casing string to move with reduced contact force, maintaining a stationary position relative to the string and allowing spherical bearings to rotate freely, thus minimizing friction and the risk of sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a casing string is moved through a subterranean well, then the wellbore can be developed for hydrocarbon production, but friction contact between the casing string and wellbore inner surface causes wear and damage to the casing string
Solution Approach 1:
A roller bearing assembly is introduced as an intermediary component between the casing string and the wellbore inner surface. The bearing assembly includes a bearing body with an outer surface that contacts the wellbore and an inner surface with roller bearings that reduce friction. This intermediary structure transfers the contact force while minimizing direct friction between the casing string and wellbore, thereby reducing wear and damage to the casing string during well development operations.
2Adaptability or versatility
If the wellbore has complex geometry with deviated zones and irregular inner diameter surface, then extended reach and complex geometry wells can be developed, but friction forces increase significantly
Solution Approach 1:
The roller bearing assembly incorporates spherical roller bearings that can dynamically adapt to the complex geometry of the wellbore. The spherical bearings are capable of rotating and adjusting their orientation to accommodate deviations from vertical and irregular wellbore diameters. This dynamic capability allows the bearing assembly to maintain effective friction reduction across various well geometries, including deviated zones and non-circular cross-sections, thereby enabling versatile well development while controlling friction forces.
3Productivity
If the inner diameter of the well is reduced, then higher hydrocarbon production can be achieved, but friction between the casing string and bore increases
Solution Approach 1:
The roller bearing assembly replaces direct mechanical contact friction with a rolling friction system. Instead of the casing string directly contacting the wellbore inner surface, the bearing assembly uses roller elements to create a rolling contact mechanism. This substitution transforms the friction problem from sliding friction (which increases significantly with reduced wellbore diameter) to rolling friction, which is substantially lower and more manageable, thereby enabling high production rate wells with smaller inner diameters.
4Reliability
If a roller bearing assembly is integrated with the casing string, then friction forces are reduced and the risk of sticking is minimized, but the device complexity increases
Solution Approach 1:
The roller bearing assembly is designed as a segmented modular component that can be integrated with the casing string in a standardized manner. The bearing assembly consists of separate functional elements (bearing body, roller bearings, retention mechanisms) that can be manufactured and assembled independently. This segmentation allows for easier integration with different casing string configurations and facilitates maintenance and replacement, thereby improving reliability while managing the complexity through modular design principles.
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 roller bearing assembly significantly reduces friction forces, minimizing the risk of the casing string sticking and buckling, thereby reducing operational costs and time, and ensuring efficient movement through deviated zones with complex geometries.
Implementation Method 1
The roller bearing assembly reduces friction forces that are generated from contact between the outer diameter surface of the casing string and the inner diameter surface of the bore
Data Source
AI summary
Systems and methods for reducing friction between a casing string and a bore of a subterranean well when moving the casing string within the bore of a subterranean well include a roller bearing assembly. The roller bearing assembly has a bearing body and a plurality of spherical bearings spaced around an outer diameter of the bearing body. The bearing body is sized to be removably attached to an outer diameter of the casing string and to be stationary relative to the casing string.