Downhole Electromechanical Actuator with Shock Absorption
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Solution Overview
Problem
Existing electromechanical actuator systems for downhole tools are cumbersome, difficult to maintain, and lack shock absorption and self-alignment features, leading to reduced reliability and survivability, especially in harsh environments, and do not have effective debris management or supplemental motor controls.
Innovation Solution
The design incorporates a compact electromechanical actuator with a piston-based fluid slurry exclusion and pressure compensating system, shock absorbing and self-aligning members, a T-slotted shaft coupling for secure attachment, and enhanced electronic control components, including redundant motion control and diagnostic logging, to reduce component count, improve access, and enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing electromechanical actuator systems are used, then basic actuation function is provided, but the device has large number of components resulting in larger size, longer length, heavier weight and difficulty in maintenance
Solution Approach 1:
The patent combines multiple functions into integrated components. The motor assembly integrates the motor, drive shaft, and control mechanisms into a single unit. The housing combines protection, mounting, and structural support functions. This merging reduces the overall number of separate components while maintaining all necessary actuation functions.
Solution Approach 2:
The actuator is designed with multi-functional components that perform multiple tasks. The housing provides both structural support and protection for internal components. The motor assembly serves both rotation and linear actuation functions through integrated mechanisms. This multi-functionality reduces component count and simplifies the overall system.
2Reliability
If existing electromechanical actuator systems are used, then actuation is provided, but components cannot be easily accessed complicating maintenance and reducing reliability
Solution Approach 1:
The actuator is divided into modular segments that can be independently accessed and serviced. The housing is designed with removable panels or sections that provide direct access to internal components like the motor assembly, drive mechanisms, and control electronics. This segmentation allows maintenance personnel to access specific components without disassembling the entire device, improving both reliability through easier maintenance and reducing downtime.
3Reliability
If existing electromechanical actuator systems are used, then actuation function is provided, but elastomeric membrane compensation results in reduced survivability especially in environments which deteriorate the elastomeric membrane
Solution Approach 1:
The patent removes the elastomeric membrane compensation system from the design and replaces it with an alternative compensation mechanism that does not rely on elastomeric materials. This extraction eliminates the vulnerability to environmental factors such as temperature extremes, chemical exposure, and degradation that affect elastomeric membranes, thereby improving survivability in harsh environments while maintaining the necessary pressure compensation function.
4Reliability
If existing electromechanical actuator systems are used, then actuation is provided, but lack of shock absorbing and self aligning systems reduces reliability
Solution Approach 1:
The actuator incorporates shock-absorbing elements such as dampers, springs, or compliant mounting features that are pre-installed to cushion against shock loads and mechanical impacts. These elements are positioned to protect critical components like the motor assembly, gear mechanisms, and connection points from damage during installation, operation, or transportation, thereby improving reliability by preventing shock-related failures.
Solution Approach 2:
The design includes self-aligning mechanisms that allow components to dynamically adjust to misalignment. This may include spherical joints, floating mounts, or compliant linkages that automatically compensate for angular or positional deviations during operation. This dynamic adaptation ensures reliable operation even when perfect alignment is not achieved, reducing the impact of installation errors or thermal expansion.
5Ease of operation
If existing electromechanical actuator systems are used, then actuation is provided, but lack of securely attached shaft with t-slot configuration complicates installation and removal
Solution Approach 1:
The shaft connection is designed as a segmented interface with the t-slot configuration allowing the shaft to be inserted and secured in discrete steps. The t-slot provides guide features that align the shaft with the mounting location, while separate fastening elements secure the shaft after positioning. This segmentation enables tool-free or simple tool-assisted installation and removal while maintaining secure attachment during operation.
6Reliability
If existing electromechanical actuator systems are used, then actuation is provided, but lack of screen housing separation from oil compensated sealed section and debris traps increases clogging risk
Solution Approach 1:
The housing is segmented into distinct sections: a screen housing that can be separately removed and a main oil-compensated sealed section. The screen housing contains debris traps that are accessible when the screen housing is removed. This segmentation allows the screen and debris trapping elements to be cleaned or replaced independently without affecting the sealed actuation mechanisms, reducing clogging risk while keeping the overall structure manageable.
7Reliability
If existing electromechanical actuator systems are used, then actuation is provided, but lack of supplemental motor controls reduces reliability
Solution Approach 1:
Multiple control functions are merged into an integrated control system that monitors and manages motor operation. This includes combining feedback from position sensors, current monitoring, temperature sensing, and error correction algorithms into a unified control circuit board that works with the motor assembly. This integration provides supplemental control capabilities that improve reliability through redundant monitoring and automatic error handling without creating a complex distributed control architecture.
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 results in a lighter, more reliable, and maintainable actuator system with reduced power requirements, improved survivability, and reduced clogging risks, while maintaining performance in harsh environments.
Implementation Method 1
piston-based fluid slurry exclusion and pressure compensating system
Implementation Method 2
shock absorbing and self-aligning members
Data Source
AI summary
An apparatus and method for the actuation of down-hole tools are provided. The down-hole tool that may be actuated and controlled using the apparatus and method may include a reamer, an adjustable gauge stabilizer, vertical steerable tools, rotary steerable tools, by-pass valves, packers, whipstocks, down hole valves, latch or release mechanisms and/or anchor mechanisms.