US 2020/0399970 A1 · FLUID DRIVEN JARRING DEVICE

Abstract

The disclosed jarring device generates two jarring impacts at the end points of a reciprocating hammer assembly. Initially, flow of pressurized fluid through the jarring device is obstructed by a deformable member. The resulting increase in fluid pressure upstream of the deformable member causes compression of a spring and downstream movement of the hammer assembly to generate a first jarring impact. A further increase in fluid pressure beyond a threshold, causes a release of the obstruction by either deforming the member or by slicing it by pushing it through a slicer. Releasing of the obstruction causes decompression of the spring, and upstream sliding of the hammer assembly to generate a second jarring impact.

Claims21

Dependent claims

A jarring device controlled by pressurized fluid flow through it, comprising:

a hammer assembly which reciprocates within the device, moving:
(i) in a downstream direction when fluid flow through the device is blocked by a deformable member which obstructs fluid flow through a channel in the device thereby causing increased pressure upstream of the hammer assembly (ii) in an upstream direction when the deformable member is forced to deform, using fluid pressure, and pass through the channel, whereby the increased pressure upstream is released and a spring, compressed with downstream movement of the hammer assembly, decompresses;
and whereby the hammer assembly's downstream movement is arrested on impact of a portion of the hammer assembly with a first portion of the device, thereby generating a first impact, and whereby a second impact is generated upon arresting decompression of the spring when an upper surface of the hammer assembly hits a second portion of the device.

Dependencies are inferred from the claim text.

Fluid driven jarring device

Life of this patent

Fluid driven jarring device

Life of this patent

Abstract

Claims21