Well Tool Device Pressure Equalization Cap Rock Barrier
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Solution Overview
Problem
Existing well tool devices for plugging and abandoning wells face challenges in withstanding increasing ambient pressure, leading to potential collapse and high material costs due to the need for strong, thick materials to manage pressure differences.
Innovation Solution
A well tool device with a movable partition device and fluid line that equalizes pressure differences, allowing for a thinner, less expensive housing structure, and a pyrotechnic mixture to form a permanent cap rock barrier by melting surrounding materials upon ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the housing wall thickness is increased or high strength materials are used to withstand external pressure, then the housing strength is improved, but the material cost increases
Solution Approach 1:
A fluid-filled chamber is introduced as an intermediary element between the housing and the external pressure. This chamber contains a fluid that transmits pressure uniformly to the housing walls, creating an internal pressure that counteracts the external pressure differential. This allows the housing to be designed with thinner walls and lower strength materials while still withstanding the external pressure loads.
Solution Approach 2:
The internal pressure parameter within the housing is changed by introducing a fluid-filled chamber that generates internal pressure to counteract external pressure. This parameter change allows the housing to operate with reduced wall thickness and lower strength materials, as the pressure differential across the housing walls is reduced by the internal fluid pressure.
2Reliability
If the housing wall thickness is increased or high strength materials are used to withstand external pressure, then the reliability is improved, but the device complexity increases
Solution Approach 1:
A fluid-filled chamber is introduced as an intermediary element between the housing and the external pressure. This chamber contains a fluid that transmits pressure uniformly to the housing walls, creating an internal pressure that counteracts the external pressure differential. This allows the housing to be designed with thinner walls and lower strength materials while still withstanding the external pressure loads.
Solution Approach 2:
The invention utilizes hydraulic principles by introducing a fluid-filled chamber that uses fluid pressure to counteract external pressure loads on the housing. The fluid transmits pressure uniformly in all directions, creating an internal pressure that balances the external pressure differential, thereby reducing the mechanical stress on the housing structure.
3Length of stationary object
If a movable partition device and fluid line are added to equalize pressure, then the housing wall thickness can be reduced, but the device complexity increases
Solution Approach 1:
A fluid-filled chamber is introduced as an intermediary element between the housing and the external pressure. This chamber contains a fluid that transmits pressure uniformly to the housing walls, creating an internal pressure that counteracts the external pressure differential. This allows the housing to be designed with thinner walls and lower strength materials while still withstanding the external pressure loads.
Solution Approach 2:
The invention utilizes hydraulic principles by introducing a fluid-filled chamber that uses fluid pressure to counteract external pressure loads on the housing. The fluid transmits pressure uniformly in all directions, creating an internal pressure that balances the external pressure differential, thereby reducing the mechanical stress on the housing structure.
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 effectively reduces the risk of tool collapse during deployment and lowers material costs by equalizing pressure, enabling the formation of a reliable cap rock-to-cap rock barrier, suitable for both onshore and offshore wells.
Implementation Method 1
a pyrotechnic mixture for melting surrounding materials to form the cap rock to cap rock barrier when solidifying
Implementation Method 2
pyrotechnic mixture for melting surrounding materials to form the cap rock to cap rock barrier
Implementation Method 3
equalizes the differential pressure between the inside of the well tool device and an ambient pressure
Data Source
AI summary
A well tool device having a movable partition device within a housing, the partition device separating an inner volume of the housing into a first compartment and a second compartment, a pyrotechnic mixture in the first compartment, and a fluid line providing fluid communication between the second compartment and an outside of the housing. A method includes, while running the well tool device into the well, equalizing a pressure difference between the second compartment and an ambient pressure outside of the housing, by means of allowing fluids to enter the second compartment through the fluid line, while running the well tool device into the well, equalizing a pressure difference between the first compartment and a pressure inside the second compartment, by means of the partition device being affected by the pressure inside the second compartment, installing the well tool device in the well, and igniting the pyrotechnic mixture.