Downhole Mechanical Actuator Torque-to-Axial Conversion
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Solution Overview
Problem
Current methods for controlling downhole operations in oil and gas wells, such as hydraulic and electric systems, face limitations in transmitting force effectively at great depths, requiring complex and hazardous equipment, and are inadequate for axial motion and two-directional operation without hydraulic lines or electrical cables.
Innovation Solution
A mechanical actuator system using a rotating wellhead and a linear motion actuator with a hollow cylindrical actuator and hinged flapper valve, which converts rotational force into axial motion and allows for two-directional operation without the need for hydraulic lines or electrical cables, utilizing a tie-back liner and adjustable rotary unions to stabilize and transfer torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If hydraulic pressure is used to operate downhole mechanisms, then force can be applied to move mechanical elements, but the available hydraulic pressure falls off with distance and becomes insufficient at great depths
Solution Approach 1:
The patent replaces the hydraulic system with a mechanical actuator system that uses a rotating wellhead and a linear motion actuator. The mechanical actuator converts rotational motion into axial motion to operate downhole mechanisms, eliminating the depth limitation of hydraulic pressure transmission.
Solution Approach 2:
The patent introduces a mechanical actuator as an intermediary device between the rotating wellhead and the downhole mechanism. This actuator serves as a mediator that transmits mechanical force effectively to the flapper valve or other downhole equipment without the pressure loss inherent in hydraulic systems.
2Force
If hydraulic equipment is used to operate downhole mechanisms, then force can be applied, but high pressure hydraulic equipment and lines on the rig floor pose a safety hazard
Solution Approach 1:
The patent replaces the hazardous high-pressure hydraulic system with a mechanical actuator system that operates at lower pressures. The mechanical actuator uses rotational motion from the wellhead to generate the necessary axial force, eliminating the need for high-pressure hydraulic lines on the rig floor.
3Force
If hydraulic lines are attached to casing for downhole operations, then force can be transmitted, but the lines are exposed to abrasion and corrosive fluids
Solution Approach 1:
The patent eliminates the need for hydraulic lines by using a mechanical actuator system. The mechanical actuator is driven by rotation from the wellhead through the casing, transmitting force mechanically without requiring vulnerable hydraulic lines that would be exposed to abrasion and corrosion.
4Ease of operation
If a powerful spring is used to assist valve closing, then the valve can close more effectively, but opening the valve requires sufficient hydraulic force to overcome both downhole fluid pressure and spring resistance
Solution Approach 1:
The patent replaces the spring-assisted hydraulic system with a mechanical actuator that can bidirectionally control the valve. The mechanical actuator can easily open the valve by applying axial force in either direction, overcoming both fluid pressure and spring resistance without requiring excessive hydraulic pressure.
5Adaptability or versatility
If two-way hydraulic valves are designed to operate in both directions, then opening and closing can be achieved, but this adds extra complexity and another point of failure requiring a second hydraulic line
Solution Approach 1:
The patent replaces the complex two-way hydraulic valve system with a simpler mechanical actuator. The mechanical actuator achieves bidirectional operation through a single device that can apply axial force in both directions, eliminating the need for a second hydraulic line and reducing system complexity and failure points.
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
Enables reliable, precise, and robust axial force transmission downhole, overcoming depth-related force limitations and simplifying operations by eliminating the need for hazardous equipment, while allowing for efficient maintenance and flow control at significant depths.
Implementation Method 1
a linear motion mechanical actuator wherein the rotation of the rotating wellhead is transferred through the casing and upper member of the mechanical actuator housing via the upper joint to the linear motion mechanical actuator
Data Source
AI summary
Disclosed herein are various embodiments of well control system for drilling an oil or gas well safely and efficiently by providing a mechanical actuator capable of transmitting a rotational force downhole, and converting the rotational force to an axial force for the purpose of operating downhole equipment, including subsurface safety valves, compressible bladder valves, and sliding sleeve valves. Because the actuator is mechanical and not hydraulic as in conventional equipment, the force applied is independent of the depth at which it is applied, overcoming a major deficiency seen in comparable hydraulic systems.