Selective Pressure-Activated Jar With Deformable Ball Release
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Solution Overview
Problem
Existing jarring devices for drill strings in oil and gas drilling operations require mechanical or hydraulic settings, which can cause coiled tubing to break down or risk unintentional firing, and are not effective for varying wellbore conditions.
Innovation Solution
A variable intensity and selective pressure activated jar that uses deformable balls to generate dynamic events for jarring, eliminating the need for mechanical or hydraulic settings, and allowing for adjustable jarring force based on wellbore conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical or hydraulic settings are used in existing jarring devices, then the drill string can be jarred, but the coiled tubing may break down or unintentional firing may occur
Solution Approach 1:
The patent replaces complex mechanical or hydraulic setting mechanisms with a simple deformable ball activation system. The ball is deformed by applying force to the free end of the drill string, which triggers the jarring function without requiring complex settings, thereby eliminating the risk of unintentional firing while maintaining reliability
Solution Approach 2:
The patent changes the activation parameter from complex mechanical/hydraulic settings to a simple force application that deforms the ball. By varying the force magnitude, different jarring intensities can be achieved, providing adaptability while simplifying the activation mechanism
2Adaptability or versatility
If existing jarring devices are used, then jarring function is provided, but they are not effective for varying wellbore conditions
Solution Approach 1:
The patent introduces a dynamic activation mechanism where the jarring function is triggered by deforming the ball through force application. The system can be dynamically adjusted by varying the force magnitude applied to the free end, allowing adaptation to different wellbore conditions while maintaining ease of operation
Solution Approach 2:
The patent enables parameter adjustment by changing the force magnitude applied to deform the ball. This simple parameter change allows the system to adapt to varying wellbore conditions without complicating the operation, as operators can simply apply different forces to achieve desired jarring intensities
3Device complexity
If deformable balls are used to activate the jar, then mechanical or hydraulic settings are eliminated, but the mechanism requires force application to deform the ball
Solution Approach 1:
The patent extracts the complex mechanical or hydraulic setting mechanisms from the jarring device, retaining only the essential deformable ball activation system. This simplification eliminates unnecessary complexity while the force requirement remains manageable through application at the free end of the drill string
Data Source
AI summary
A jarring tool used to dislodge a stuck tubular string or bottom hole assembly within an underground wellbore. A funnel element is placed underground either within, or as part of, a tubular string. A deformable ball may be seated within the funnel element to block fluid from passing within the tubular string. Hydraulic pressure may build within the tubular string until it exceeds the pressure the ball can withstand. This will cause the ball to deform and be expelled through the funnel element. With no ball to block its flow, fluid will be rapidly released through the funnel element. The rapid release of fluid will cause a powerful jarring or jolting to the tubular string or bottom hole assembly. Deformed balls may be captured in a cartridge chamber installed within the drill string and sized to create turbulent fluid flow within the drill string.