Impact Enhancer Apparatus for Drilling Jarring Force
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Solution Overview
Problem
Conventional drilling jars face inefficiencies in generating impact force due to pin and box stretching during connection and drilling, which limits their effectiveness in unsticking a stuck drill string.
Innovation Solution
An impact enhancer apparatus with primary and secondary energy storage means, utilizing resilient components like springs to store energy differentially in axial directions, enhancing the jarring force by selectively resisting movement and releasing energy for greater acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional drilling jars are used with pin and box connections, then the drill string can be connected and drilled, but the pins and boxes are subject to stretching which reduces impact force generation capability
Solution Approach 1:
The impact enhancing apparatus is divided into separate functional components: an inner member that moves axially, an outer member that provides housing, and distinct energy storage means (springs) that are independently positioned to store and release energy. This segmentation allows each component to perform its specific function without interfering with others, thereby maintaining connection stability while generating impact force.
Solution Approach 2:
The springs are pre-compressed during the connection process to store elastic energy before the drilling operation begins. This preliminary action ensures that when the drill string becomes stuck and jarring is required, the energy is already stored and ready to be released instantly, compensating for any stretching that may have occurred during connection and drilling.
2Force
If energy storage means are added to enhance impact force, then the jarring effectiveness is improved, but the device complexity increases
Solution Approach 1:
The inner member serves multiple functions: it acts as the hammer that delivers impact, provides the moving component that compresses the springs during connection, and serves as the structural core around which the outer member and energy storage means are arranged. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while still achieving enhanced impact force.
Solution Approach 2:
The energy storage means (springs) are positioned within the annular space between the inner member and outer member, nesting the energy storage function within the existing structural envelope. This nesting approach allows the addition of energy storage capability without requiring external additions that would significantly increase overall device complexity or size.
3Use of energy by moving object
If the inner member is allowed to move freely in axial directions, then energy storage is maximized, but control over the impact timing and direction is reduced
Solution Approach 1:
The inner member is designed to move axially relative to the outer member, transforming the static structure into a dynamic system. This movement allows the springs to be compressed and expanded naturally based on operational conditions, maximizing energy storage while the inherent dynamics of the system provide automatic timing and direction control through the compression and expansion cycles.
Solution Approach 2:
The movement of the inner member in axial directions automatically compresses the springs to store energy, and the spring expansion automatically propels the inner member to generate impact. This self-service mechanism eliminates the need for external control systems, maintaining ease of operation while maximizing energy storage through the natural motion of the components themselves.
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 apparatus significantly increases the jarring force transmitted to the drill string, effectively addressing the limitations of conventional systems by optimizing energy storage and release mechanisms, thereby improving the chances of unsticking a stuck drill string.
Implementation Method 1
a primary resilient means which may comprise a primary biasing means... The primary energy storage means may be adapted to store energy when compressed by movement of the inner member in either of the first and second axial direction with respect to the outer member
Data Source
AI summary
An impact enhancer apparatus includes: a substantially tubular inner member, a substantially tubular outer member that is axially movable in relation to the inner member, a primary energy storage device adapted to store energy when the inner member is moved in either of first and second axial directions with respect to the outer member and a secondary energy storage device adapted to store energy when the inner member is moved in a first axial direction with respect to the outer member. The primary energy storage device may include a primary biasing device. The secondary energy storage device may include a secondary biasing device. The primary and/or secondary biasing devices may be a spring device such as a disk spring, a coiled spring, a fluid spring, a gas spring, etc. The impact enhancing devices may include tubular members that have double shoulder high torque connections.