Shock isolator for downhole well drilling
AssigneeMS Directional, LLC
InventorsJianke Wang, Derek Thomas Koller
Life of this patent
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Abstract
The disclosure provides an improved shock isolator having one or more features of: bidirectional variable metered hydraulic damping orifice; unidirectional flow valve for higher compression damping yet faster rebounding for reset; diverse spring styles for rebound and for compression; scalable back pressure for more efficient hydraulic damping; involute spline for higher torque loading capacity; progressive disk spring assemblies to expand operating frequency range and longevity; spring stack assemblies conform to establish more uniform loading during a stroke.
Claims25
A shock isolator for downhole well drilling, comprising:
- a housing having an inner periphery;
- and
- a damper piston subassembly having a damper piston configured to be inserted into the inner periphery, having an outer periphery smaller than the inner periphery to form an annular orifice between the housing and the damper piston subassembly, the damper piston subassembly being longitudinally moveable relative to the housing, the damper piston formed with a longitudinal variable depth damping orifice on the outer periphery of the damper piston, the damping orifice having a taper on a first end of the damping orifice, and a second taper on a second end of the damping orifice that forms a variable flow zone for fluid based on a relative position of the damper piston subassembly in the housing and configured to control a damping and response time of the shock isolator to reciprocal compression and return.
A shock isolator for downhole well drilling, comprising:
- a housing having an inner periphery;
- a damper piston subassembly having a damper piston configured to be inserted into the inner periphery having an outer periphery smaller than the inner periphery, the damper piston subassembly being longitudinally moveable relative to the housing, the damper piston formed with a longitudinal piston opening formed inward of the outer periphery;
- a unidirectional valve having a sealing portion flexibly coupled over an end of the piston opening across a damper piston face and having a hub portion fixedly coupled to the damper piston face radially distal from the piston opening and configured to allow the unidirectional valve to longitudinally bend away from the damper piston face and allow flow through the piston opening in a first direction and longitudinally close over the damper piston face to restrict flow in a second direction to control a damping and response time of the shock isolator to reciprocal compression and return;
- and
- a limit plate coupled with the unidirectional valve and the damper piston that forms a travel space between the damper piston face and a limit plate face, the limit plate face having a taper that longitudinally progressively increases a travel space as a distance from the hub portion to the sealing portion increases.
Dependencies are inferred from the claim text.