Shear Pin Deactivates Steering Pad in Rotary Steerable System
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Solution Overview
Problem
The premature actuation of steering pads in rotary steerable drilling systems leads to excessive wear on components, damage to the wellbore, and unnecessary torque, compromising the structural integrity and steering ability of the system.
Innovation Solution
Incorporating a shear pin that is inserted into a pad stopper on the steering pad, preventing actuation until a fluid pulse breaks it, allowing controlled activation and reducing friction and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the steering pad is designed to be easily activated, then the steering responsiveness is improved, but premature actuation occurs causing excessive wear and damage
Solution Approach 1:
The shear pin is pre-installed in the pad stopper to prevent premature actuation of the steering pad. The pin is designed to break only when a specific breaking force is applied, allowing controlled activation at the desired moment while preventing early engagement that would cause wear and damage.
Solution Approach 2:
The shear pin's mechanical strength parameter is specifically designed to break under controlled conditions. By adjusting the pin's material properties and dimensions, the system achieves reliable prevention of premature actuation while allowing intentional activation when the breaking force threshold is reached.
2Reliability
If the steering pad remains deactivated for protection, then component wear is reduced, but the system cannot steer when needed
Solution Approach 1:
The shear pin is designed as a sacrificial component that is 'taken out' of the system through controlled breaking. Once the pin breaks under the applied breaking force, it is removed from the load path, allowing the steering pad to engage and the system to steer when needed.
Solution Approach 2:
The system is prepared in advance with the shear pin installed for protection, but includes the capability to intentionally break the pin when steering is required. This preliminary setup allows the system to transition from protected state to active steering state on demand.
3Reliability
If a mechanical locking mechanism is used to prevent premature actuation, then reliability is improved, but device complexity increases
Solution Approach 1:
The shear pin is designed as a simple, inexpensive, disposable component rather than a complex reusable locking mechanism. The pin breaks after serving its protective function, and can be replaced if needed, providing reliable premature actuation prevention without complex mechanics.
Solution Approach 2:
The locking function is extracted from a complex mechanical system and simplified to a single shear pin component. This extraction reduces device complexity while maintaining the essential function of preventing premature actuation through a simple shear strength-based mechanism.
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
Prevents premature actuation of steering pads, reducing wear and maintaining the structural integrity of the rotary steerable system, while enabling precise steering and navigation through wellbore formations.
Implementation Method 1
The shear pin can be broken or sheared with a fluid pulse. For example, the shear pin can be broken with a pulse of pressurized mud or drilling fluid.
Data Source
AI summary
A body of a shear pin can be positioned in a pad stopper of a steering pad of a rotary steerable system. The rotary steerable system can be used to steer a drill in a wellbore. The steering pad can be positioned on the rotary steerable system such that a head of the shear pin is coupled with a lateral pad of the rotary steerable system. The head of the shear pin can deactivate the steering pad by preventing the steering pad from actuating. A fluid pulse can be output in the wellbore to break the shear pin for enabling the steering pad to actuate to cause the rotary steerable system to steer the drill in the wellbore.