Fluid Driven Jarring Device Spring Compression
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Solution Overview
Problem
Existing jarring devices used in oil and gas drilling, particularly for directional drilling and deep wells, often fail to generate sufficient jarring impact to overcome friction and release stuck equipment or tubing due to limitations in energy storage and release mechanisms.
Innovation Solution
A jarring device that compresses a spring by obstructing the flow path of pressurized fluid using a deformable sphere, which then deforms and opens the path, causing rapid decompression and generating a strong second jarring impact, allowing for effective release of stuck equipment or tubing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a deformable sphere is used to block fluid flow in a jarring device, then the device structure is simplified and operation is easier, but the jarring impact strength is insufficient to release highly bound tubing or stuck equipment
Solution Approach 1:
The spring is pre-compressed by the deformable sphere blocking the fluid flow path before the actual jarring action is needed. This preliminary compression stores elastic potential energy that is rapidly released when the sphere deforms and opens the flow path, generating a strong jarring impact. The preliminary action of compressing the spring resolves the contradiction by preparing energy in advance without requiring complex additional mechanisms.
Solution Approach 2:
The jarring device operates through periodic cycles of sphere insertion, flow blocking, spring compression, sphere deformation, and rapid spring decompression. This periodic action allows the system to accumulate and release energy in discrete bursts, creating strong intermittent jarring impacts. The cyclic nature of the operation enables repeated jarring actions while maintaining structural simplicity through the reusable deformable sphere mechanism.
2Force
If stretch or compression forces are applied to a mandrel using mechanical friction to load potential energy, then a significant striking impact can be generated, but the drill string or other equipment such as the BHA may be affected or damaged
Solution Approach 1:
The invention replaces the mechanical friction-based mandrel stretching/compression system with a fluid-driven spring compression system. Instead of applying mechanical forces to the drill string or BHA components, pressurized fluid is used to drive the deformable sphere, which in turn compresses the spring. This substitution eliminates direct mechanical stress on the drill string and BHA, preserving their integrity while still generating strong jarring impacts through spring decompression.
Solution Approach 2:
The jarring device uses hydraulic pressure from pumped fluid to operate the deformable sphere and compress the spring. The fluid pressure serves as the energy source, replacing mechanical force application to the mandrel. This hydraulic approach allows energy transfer without direct mechanical contact with vulnerable components like the drill string or BHA, thereby maintaining reliability while achieving the required striking impact through controlled spring decompression.
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
The device achieves stronger jarring impacts compared to previous designs, effectively overcoming friction and releasing stuck equipment or tubing, even in deep wells where high binding forces are present.
Implementation Method 1
compressing a spring by obstructing the flow path of pressurized fluid using a deformable sphere, and then causing rapid spring decompression
Implementation Method 2
opening the obstructed flow path by deforming or slicing the deformable sphere
Implementation Method 3
a sudden release of the mandrel, which generates a significant striking impact against an anvil; which in turn generates a shock wave along the coil tubing
Data Source
AI summary
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.