Hydraulic downhole tool decelerator
AssigneeSchlumberger Technology Corporation
InventorsJulien Toniolo, Simon Mattias Flander
Life of this patent
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Abstract
Embodiments described herein provide systems and methods for minimizing deceleration of downhole tools when the downhole tools are pumped down into wellbores through drill pipe in an untethered manner. For example, embodiments described herein include a hydraulic downhole tool deceleration system that includes a hydraulic decelerator configured to be affixed to a downhole tool string pumped down through drill pipe during operation. The hydraulic decelerator is configured to contact a hard shoulder while traveling through the drill pipe, and to limit an initial magnitude of deceleration of the downhole tool string caused at the initial moment of contact of the hydraulic decelerator against the hard shoulder.
Claims16
A hydraulic downhole tool deceleration system, comprising:
- a hydraulic decelerator configured to be affixed to a downhole tool string pumped down through drill pipe during operation, wherein the hydraulic decelerator is configured to contact a hard shoulder while traveling through the drill pipe, and to limit an initial magnitude of deceleration of the downhole tool string caused at an initial moment of contact of the hydraulic decelerator against the hard shoulder,
- wherein the hydraulic decelerator comprises a piston affixed to the downhole tool string radially about an outer diameter of the downhole tool string and an outer sleeve disposed radially about the piston, wherein a first hydraulic chamber is formed between the outer sleeve and the piston, wherein the first hydraulic chamber is filled with hydraulic fluid, and wherein axial movement of the piston relative to the outer sleeve causes the hydraulic fluid to flow out of the first hydraulic chamber after the outer sleeve contacts the hard shoulder.
Dependencies are inferred from the claim text.