Steering System Radial Flow Passage Torque Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional rotary steerable systems for directional drilling face challenges in maintaining structural integrity and resistance to torque while achieving a larger flow area with a smaller radial extent, leading to potential erosion and reduced control over drilling mud flow.
Innovation Solution
A rotary steerable system with actuator pistons slidably mounted in a mechanical structure, where the main flow of drilling mud is directed through a radially outward passage, creating a larger flow area with a smaller radial extent and enhancing torsional stiffness by positioning components near the centerline, thereby improving torque resistance and flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the main flow of drilling mud is directed through a conventional central passage, then the flow area is limited, but the radial extent must be increased to achieve larger flow area, which reduces structural integrity and torque resistance
Solution Approach 1:
The flow passage is reconfigured to extend radially outward from the centerline rather than being confined to a central axis. This dimensional change allows the flow area to increase in the radial direction while maintaining a compact axial footprint, resolving the contradiction between flow area and structural strength.
Solution Approach 2:
The flow passage is divided into multiple segments: a radially inward portion for receiving drilling mud, a radially outward portion for main flow, and intermediate portions connecting them. This segmentation allows each portion to be optimized for its specific function while maintaining overall structural integrity.
2Strength
If the mechanical structure is made stronger to resist torque, then torque resistance improves, but the radial extent increases, reducing the ability to achieve larger flow area with smaller radial extent
Solution Approach 1:
The mechanical structure is designed with varying local properties: the radially outward portion is positioned to define the main flow passage while the radially inward portion contains ports for actuator pistons. This local differentiation allows the structure to be strong where needed for torque resistance while maintaining compact radial extent for flow efficiency.
3Ease of operation
If the flow passage is positioned radially outward to increase flow area, then flow control improves, but the structural complexity increases
Solution Approach 1:
The flow passage and mechanical structure are merged into a single integrated component. The radially outward portion of the mechanical structure simultaneously defines the main flow passage and provides structural support, eliminating the need for separate flow control components and reducing overall system complexity.
Data Source
AI summary
A technique facilitates directional drilling of boreholes. A steerable system has a plurality of actuator pistons slidably mounted in a mechanical structure. The mechanical structure comprises a radially inward portion containing ports to deliver a portion of drilling mud to the plurality of actuator pistons. The mechanical structure also has a radially outward portion positioned to define a main flow passage extending longitudinally through the steerable system between the radially inward portion and the radially outward portion of the mechanical structure.