Multi-Stage High Shear Mixing for Drilling Fluid Rheology
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Solution Overview
Problem
Current drilling fluid mixing techniques are inadequate, leading to agglomerates, molecular degradation, and inefficient rheological properties, resulting in cost inefficiencies and performance failures downhole due to inadequate high shear mixing and hydration issues with polymer additives.
Innovation Solution
The use of multiple stage high shear mixing units with rotor/stator designs that apply centrifugal force and hydraulic shear to drilling fluids, dispersing additives while preserving polymer chains and maintaining fluid stability, reducing the need for high-pressure mixing equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional mixing techniques are used, then the mixing process is simple, but agglomerates form and rheological properties are inadequate
Solution Approach 1:
The mixing process is divided into multiple stages with different shear rates. The high shear mixer uses a rotor-stator configuration where the rotor rotates at high speed to create intense shear forces, followed by a low shear stage for gentle blending. This segmentation allows each stage to perform its specific function optimally, preventing agglomerate formation while avoiding molecular degradation.
Solution Approach 2:
The mixing system employs variable speed rotation of the rotor to dynamically adjust shear rates during the mixing process. The rotor speed can be controlled to provide high shear initially for dispersion, then reduced for final blending, adapting the mixing intensity to the specific needs of different additives and fluid states throughout the process.
2Reliability
If high-pressure mixing equipment is used, then mixing effectiveness improves, but equipment cost and operational complexity increase
Solution Approach 1:
The patent replaces high-pressure mechanical mixing systems with a high shear rotor-stator system that generates intense mixing forces through rotational shear rather than pressure. The rotor rotates at controlled speeds to create shear forces that effectively disperse additives and maintain fluid stability without requiring high-pressure equipment, thereby reducing equipment complexity and cost while improving reliability.
3Stability of the object's composition
If high shear mixing is applied, then additive dispersion improves, but polymer chains may degrade
Solution Approach 1:
The mixing process is segmented into high shear and low shear stages. The high shear stage briefly disperses additives to break up agglomerates, then transitions to a low shear stage for gentle final blending. This segmentation ensures adequate additive dispersion while limiting the duration and intensity of shear exposure to protect polymer chains from degradation.
Solution Approach 2:
The mixing process uses periodic cycles of high and low shear rates. The rotor alternates between high-speed rotation for dispersion and lower-speed rotation for gentle blending, creating a periodic action that achieves thorough additive distribution while allowing polymer chains to recover between high-shear episodes, preventing cumulative degradation.
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
This approach produces drilling fluids with improved rheological profiles, reducing the formation of cuttings beds, minimizing pressure requirements, and maintaining fluid stability, thereby enhancing drilling efficiency and reducing operational costs by extending the life of mixing unit components and minimizing rig downtime.
Implementation Method 1
The use of multiple stage high shear mixing units with rotor/stator designs that apply centrifugal force and hydraulic shear to drilling fluids
Implementation Method 2
The use of multiple stage high shear mixing units with rotor/stator designs that apply centrifugal force and hydraulic shear to drilling fluids, dispersing additives while preserving polymer chains and maintaining fluid stability
Data Source
AI summary
A method of mixing drilling fluids, the method including injecting a drilling fluid into a high shear mixing unit and processing the drilling fluid with the high shear mixing unit. The processing includes forcing the drilling fluid through a first row of teeth of a first stage.