Hydraulic Jar Trigger Device Bi-Directional Impact
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Solution Overview
Problem
Existing hydraulic drilling jars face challenges in delivering bi-directional impact forces due to complex valve arrangements and reliance on tight manufacturing tolerances, which lead to reliability issues and difficulty in maintenance, especially in deep well drilling environments.
Innovation Solution
A hydraulic jar with a simplified flow control device that uses a metering sleeve system to control fluid flow between chambers, allowing for bi-directional operation and easy recocking, featuring a trigger device that impedes fluid flow to create a time delay before impact, and a recocking mechanism for quick reset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex valve arrangements are used to achieve bi-directional impact forces, then the hydraulic jar can deliver impact in both directions, but the device complexity increases and reliability decreases
Solution Approach 1:
The patent combines two separate flow control valves into a single flow control device with a movable member that can be positioned in different locations. This single device controls fluid flow in both directions, eliminating the need for separate valves and reducing overall device complexity while maintaining bi-directional operation capability.
Solution Approach 2:
The movable member of the flow control device serves multiple functions: it controls fluid flow in the first direction when positioned at the first location, controls fluid flow in the second direction when positioned at the second location, and can be easily repositioned between these states. This multi-functionality allows a single component to replace what would traditionally require multiple specialized components.
2Manufacturing precision
If tight manufacturing tolerances are used for valve components, then precise fluid flow control is achieved, but manufacturing difficulty increases and maintenance becomes problematic
Solution Approach 1:
The patent employs a metering sleeve with progressively smaller diameters along its length, creating a stepped configuration. This geometric parameter variation provides inherent flow control precision through the gradual reduction in diameter, eliminating the need for tight manufacturing tolerances on valve components. The metering sleeve's stepped design naturally meters fluid flow as it passes through sections of different diameters.
3Loss of time
If traditional flow control valves are used, then fluid flow restriction is achieved, but the device length increases and complexity increases
Solution Approach 1:
The flow control device is positioned within the cylindrical cavity of the housing, with the movable member nested within the flow control device. The metering sleeve is integrated into the movable member, creating a compact nested arrangement. This nesting allows the flow control functionality to be incorporated within the existing device footprint without significantly increasing overall length.
4Ease of operation
If phenolic balls or trigger devices are dropped into the wellbore to fire the jar, then the jar can be activated, but the method is imprecise and retrieval is difficult
Solution Approach 1:
The system uses a tether attached to the movable member that extends to the surface. The operator can control the movable member's position by manipulating the tether from the surface, allowing precise control of the flow control device's state. This self-service approach eliminates the need for dropping trigger devices and allows for precise, retrievable control of the jar's activation.
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 solution enables reliable, compact, and easily maintainable bi-directional hydraulic jars that can withstand deep well conditions, providing dependable and efficient impulse forces for both uphole and downhole operations with reduced complexity and increased reliability.
Implementation Method 1
fluid pressure in the upper chamber increases, and the hydraulic fluid begins to slowly flow from the upper chamber, through the restrictor, to the lower chamber. The increased fluid pressure of the upper chamber provides resistance to the applied tension load, causing the drill string to stretch and store energy
Implementation Method 2
releasing the tension load being applied to the drill string and allowing the stored energy of the stretched drill string to accelerate the mandrel rapidly upward within the housing until the hammer of the mandrel impacts the shoulder of the housing
Data Source
AI summary
A hydraulic jar includes a tubular housing having central bore and an exterior. The housing includes a passage from the central bore to the exterior. A mandrel is axially movable within the housing, forming an annular space between the mandrel and the housing that includes a timing fluid. The mandrel includes an interior axial space that permits the flow of a drilling fluid. A timing device is fixed to the mandrel in the annular space. A trigger is capable of blocking the flow of drilling fluid through the axial space in the mandrel, and the mandrel moves axially in the housing when the trigger engages the mandrel. The timing device causes the mandrel to move at a first speed and at a second speed to create the impulse. The drilling fluid exits the central bore through the opening after the mandrel moves past the opening.