Rotary Steerable System Pad Actuator Hinge Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional rotary steerable systems in wellbore drilling experience issues with slot wear and piston jamming due to the use of sliding slot connections, which affect steering performance and reliability.
Innovation Solution
A pad actuator design featuring a piston connected directly to a steering pad through a hinge, eliminating the need for a linkage arm, and incorporating a barrel-shaped piston within an actuation cylinder, which reduces wear and enhances steering performance by allowing the piston to pivot and exert force on the wellbore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sliding slot connection is used to connect the piston to the steering pad, then the structure can provide steering force, but slot wear and piston jamming occur which reduce reliability
Solution Approach 1:
The patent removes the problematic sliding slot connection from the system. Instead of using a slot to guide the piston, the invention uses a spherical bearing that allows the piston to pivot freely without requiring a sliding slot, thereby eliminating the source of wear and jamming while maintaining the steering function.
Solution Approach 2:
The patent introduces a spherical bearing as an intermediary element between the piston and the steering pad. This spherical bearing acts as a mediator that allows relative motion and force transmission without the direct sliding contact that causes wear, thus resolving the contradiction between providing steering force and avoiding wear.
2Ease of operation
If a linkage arm is used to connect the piston to the steering pad, then the structure can transmit force, but the complexity of the device increases
Solution Approach 1:
The patent merges the functions of the linkage arm and the connection mechanism into a single spherical bearing attachment. The spherical bearing directly connects the piston to the steering pad, combining force transmission and angular adjustment functions into one element, thereby reducing device complexity while maintaining ease of operation.
Solution Approach 2:
Instead of using a rigid linkage arm that requires complex joints to accommodate motion, the patent inverts the approach by using a spherical bearing that naturally accommodates angular motion. This reversal of the connection approach simplifies the structure while maintaining the ability to transmit force effectively.
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 solution improves steering performance by reducing wear and jamming risks, allowing for more precise directional control during wellbore drilling operations.
Implementation Method 1
a pad actuator including: a pad housing mounted on the steering collar and a steering pad, wherein each steering pad is pivotably coupled to one of the pad housings via a first hinge pin
Implementation Method 2
each barrel-shaped piston is movable within its respective actuation cylinder such that, when extended out of the actuation cylinder, its respective steering pad pivots laterally
Data Source
AI summary
A rotary steerable system (RSS), the RSS including steering collar pockets, actuation cylinders positioned in the steering collar pockets, barrel-shaped pistons positioned in the actuation cylinders and pad actuators attached to the pistons. Each barrel-shaped piston includes a piston hanger; each pad actuator includes a pad housing mounted on the steering collar and a steering pad. Each steering pad is pivotably coupled to one of the pad housings via a first hinge pin and is directly connected via a second hinge pin to the piston hanger of at least one of the pistons. Each barrel-shaped piston is movable within its respective actuation cylinder such that, when extended out of the actuation cylinder, its respective steering pad pivots laterally from the steering collar on the first hinge pin to contact a side of a wellbore, urging the steering collar in a direction opposite the lateral direction.