Annular Bellows for Concentric Fluid Volume Compensation
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Solution Overview
Problem
Current pressure compensation technologies in oilfield production equipment, such as compensating pistons and axial bellows, are not suitable for fluid volumes that are concentric, often requiring unreliable sealing elements in permanent downhole equipment.
Innovation Solution
A downhole pressure compensation system utilizing a deformable hollow cylindrical bellow made of an elastically deformable alloy with oscillating radii, allowing radial expansion and contraction to compensate concentric fluid volumes without the need for sealing elements, by being integrated within a housing and mandrel with injection ports for fluid communication control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compensating pistons or axial bellows are used, then fluid volume compensation is achieved, but sealing elements are required which reduce reliability in permanent downhole equipment
Solution Approach 1:
The patent employs an annular bellow made of elastically deformable alloy that expands and contracts radially to compensate for fluid volume changes. This flexible shell structure eliminates the need for sealing elements between concentric fluid volumes, directly resolving the reliability issue while maintaining the compensation function.
Solution Approach 2:
The invention transitions from axial bellows (one-dimensional linear motion) to annular bellows that expand and contract radially (two-dimensional volumetric change). This dimensional change allows the bellow to compensate concentric fluid volumes without requiring seals, as the expansion occurs in the radial direction rather than requiring axial sealing interfaces.
2Adaptability or versatility
If axial bellows are used, then fluid volume compensation is achieved, but they are not suitable for concentric fluid volumes
Solution Approach 1:
The patent transforms the traditional axial bellow configuration into an annular bellow that operates in the radial dimension. This allows the device to accommodate concentric fluid volumes by expanding and contracting radially, making it adaptable to applications where axial bellows would fail, while eliminating sealing requirements for improved reliability.
Solution Approach 2:
The annular bellow is constructed with multiple circumferential segments or lobes that can expand and contract independently. This segmentation allows the structure to adapt to volumetric changes in concentric fluid volumes while maintaining structural integrity and eliminating the need for sealing elements between segments.
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 system provides a reliable and flexible means to maintain equal pressure between concentric fluid volumes, accommodating volumetric changes due to temperature and pressure, ensuring no differential pressure and eliminating the need for seals in the system.
Implementation Method 1
A bellow is arranged within the annulus and is deformable in an annular direction in response to fluid volume expansions. The bellow is made up of a hollow cylindrical tube that is axially arranged in a generally tubular shape made up of a elastically deformable alloy
Implementation Method 2
accommodating volumetric changes due to temperature and pressure
Data Source
AI summary
Embodiments of the present invention relate to a volumetric compensating annular bellows used to compensate two fluid volumes by an annular displacement. This is achieved using a bellows welded on to a tube with a varying shape radius. A bellows is arranged within the annulus and is deformable in an annular direction in response to fluid volume expansion. The bellows can be used in several oilfield applications for fluid compensation.