Field-Responsive Fluids Density Reduction Creep Flow
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Solution Overview
Problem
Field-responsive fluids, such as magnetorheological and electrorheological fluids, face issues with high specific gravity and susceptibility to creep flow, which can lead to equipment damage and fluid loss in long fluid columns like wellbores due to their high density and inability to effectively resist shear forces.
Innovation Solution
The use of composite and shaped particles with lower density inclusions, along with multi-phase base fluids, reduces the fluid's density while maintaining field-responsive properties, and the introduction of a multi-phase base fluid with immiscible substances enhances the fluid's ability to resist creep flow by utilizing surface tension between phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional magnetorheological fluids with high density particles are used, then field-responsive properties are achieved, but hydrostatic pressure damages equipment and completion in long fluid columns
Solution Approach 1:
The patent uses composite particles consisting of a magnetic core material (providing field-responsive properties) combined with a lower-density shell or coating material. This composite structure reduces the overall particle density while maintaining the magnetic properties necessary for field-responsive behavior, thereby reducing hydrostatic pressure in long fluid columns while preserving equipment reliability
Solution Approach 2:
The patent modifies the density parameter of the particles by using hollow spherical structures or coating magnetic cores with lower-density materials. This parameter change reduces the specific gravity of the fluid from typical values of 3-4 to lower values, directly addressing the hydrostatic pressure issue while maintaining field-responsive capabilities through the preserved magnetic core
2Strength
If magnetorheological fluids form chains in magnetic field, then shear resistance is increased, but creep flow occurs through spaces between particles causing fluid loss
Solution Approach 1:
The patent utilizes the controlled porous or spaced structure between particles in the chain formation to allow selective permeability. The magnetic chains provide sufficient shear resistance to prevent bulk flow while the inter-particle spaces permit controlled fluid passage, preventing unwanted fluid loss through seals while maintaining sealing effectiveness
Solution Approach 2:
The patent creates different local properties within the fluid structure: regions of high particle concentration and strong magnetic interaction provide shear resistance and sealing, while inter-particle spaces provide fluid passage pathways. This local differentiation allows the fluid to simultaneously resist shear forces and permit controlled fluid flow
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 reduced density field-responsive fluids effectively mitigate equipment damage and fluid loss in long columns by maintaining utility in wellbores and improving dynamic or static seals through enhanced resistance to creep flow.
Implementation Method 1
in the presence of a magnetic field the particles suspended in the base fluid align and form chains which are roughly parallel to the magnetic lines of flux associated with the field
Implementation Method 2
Resistance to shear is increased due to the magnetic attraction between particles of the chains
Implementation Method 3
The surface tension between the boundaries of the immiscible substances in conjunction with the magnetically responsive particle chains tends to stop or retard creep flow
Data Source
AI summary
A field-responsive fluid which enters a semi-solid state in the presence of an energy field is improved by use of a plurality of energy field responsive particles which form chains in response to the energy field. The particles can be (a) composite particles in which at least one field-responsive member having a first density is attached to at least one member having a second density that is lower than the first density, (b) shaped particles in which at least one field-responsive member has one or more inclusions, and (c) combinations thereof. The particles improve the field-responsive fluid by reducing density without eliminating field-responsive properties which afford utility. Further, a multi-phase base fluid including a mixture of two or more substances, at least two of which are immiscible, may be used. The multi-phase base fluid improves the field-responsive fluid because surface tension between the boundaries of the immiscible substances in conjunction with chains formed by field-responsive particles tends to stop or retard creep flow, resulting an improved dynamic or static seal.