Modified Helical Wellbore Stabilizer for Flow and Vibration Balance
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Solution Overview
Problem
Existing wellbore stabilizers face challenges in balancing the need for reduced friction, vibration, and flow path obstruction while maintaining effective support for drill strings, particularly in non-vertical wellbores, and are difficult to install and replace due to hard coatings on helical elements.
Innovation Solution
The design of helical wellbore stabilizers with a modified 'Z' or 'S' shape, featuring variable annular flow areas and unobstructed axial paths between elements, along with enhanced load lines and angled faces for easier installation, addresses these issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If helical wellbore stabilizing elements are used to maintain drill string alignment, then friction and vibration are reduced, but the flow path between elements becomes obstructed
Solution Approach 1:
The stabilizing elements are segmented into discrete helical blades spaced along the drill string, creating alternating zones of support and flow passage. This segmentation allows the elements to provide alignment support while maintaining open flow paths between adjacent blades, resolving the contradiction between friction reduction and flow obstruction.
Solution Approach 2:
The helical elements are configured in a three-dimensional spiral arrangement around the drill string axis, transitioning from a two-dimensional planar view. This dimensional arrangement creates variable annular flow areas that maintain fluid flow capability while the elements themselves provide the necessary mechanical support and alignment, eliminating the trade-off between support and flow path clarity.
2Strength
If hard coatings are applied to helical elements for durability, then element strength is improved, but installation and replacement become difficult
Solution Approach 1:
The stabilizer system is divided into modular helical elements that can be independently installed and replaced along the drill string. Each element maintains its hard coating for durability during operation, but the segmented design allows individual elements to be accessed, removed, and replaced without affecting the entire stabilizer assembly, thus resolving the contradiction between strength and ease of maintenance.
3Reliability
If helical elements are designed for maximum support, then alignment effectiveness is improved, but the annular flow area is reduced
Solution Approach 1:
The helical elements are designed with varying local properties along their length and circumference. The elements provide maximum support where needed for alignment, while maintaining sufficient annular flow area in critical flow zones. This local differentiation allows the stabilizer to achieve both effective alignment and adequate fluid flow capacity simultaneously.
Data Source
AI summary
Provided is a stabilizer for use in a wellbore. The stabilizer, in one example, includes a downhole tubular coupleable to a downhole conveyance in a wellbore. In accordance with this example, the stabilizer additionally includes two or more helical wellbore stabilizing elements extending radially outward from the downhole component, the two or more helical wellbore stabilizing elements shaped such that an annular flow area between leading edges of adjacent helical wellbore stabilizing elements and between trailing edges of adjacent helical wellbore stabilizing elements is variable along at least a portion of a length (L) of the two or more helical wellbore stabilizing elements, and such that an unobstructed axial flow path exists between the adjacent helical wellbore stabilizing elements along the length (L).