MagneGear™ Linear Magnetic Gear-Magnetically Geared and Sprung Safety Valve

MagneGear™ shows a LMG applied to a tubing retrievalbe surface controlled subsurface safety valve (SCSSV). *PATENTS PENDING

• Totally sealless
• Totally non-contacting rotating elements
• Force or speed multiplier / reducer
• Wide range of ratios
• Scalable to any size or torque requirement

Such a design gives the advantage of force multiplication on the tubing retrievable valve.  For example, with a 6:1 ration, which would be appropriate and smoothly operating in the diameters required for a safety valve as described, a 500 pound linear force aplied to the input member by the surface controlled actuator would yield 3,000 pounds of linear force on the tubular valve actuator.

Linear magnetic valve operators are currently used in the downhole drilling and completions industries, but they operate on a synchronous 1:1 ratio.  Replacing those 1:1 actuators with Dexter's MagneGear linear magnetic gear actuators provides the benefit of force multiplication.  If the ouput force of an existing device is sufficient for application, force multiplication then allows a lighter and thus smaller prime mover.  The force of the prome actuator, be it hydraulic or electric, can be reduced by 80% or more.  There are a multitude of similar applications in the area of smart completions, such as sliding sleeves that can benefit from the force multiplying phenomenon of this device.

An alternative embodiment for either the RMG or LMG is to use the gear system to increase speed.  For example, it is feasible that a higher speed, low torque drill motor could be advantageous particularly in microhole drilling.  In this instance an inverted RMG appears to have application.

For further inquiries, please e-mail us at info@dextermag.com -or- call us at 888-556-5023.