ESP Stage Geometry for High-Viscosity Hydraulic Loss Reduction
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Solution Overview
Problem
Conventional electric submersible pump (ESP) designs suffer significant hydraulic and viscous losses when pumping high viscosity fluids due to straight break water areas, leading to reduced efficiency.
Innovation Solution
Implementing a diffuser with a curved break water region and optimizing the impeller design with a cut-back shroud and hub to minimize hydraulic and viscous losses, along with a high impeller blade angle and low blade count for improved pressure recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a straight break water area is used in the diffuser, then the device complexity is reduced, but hydraulic loss increases significantly when pumping high viscosity fluids
Solution Approach 1:
The patent applies curvature to the break water area by forming it with a curved profile instead of a straight line. This curved geometry allows the fluid flow to follow a smoother path around the impeller outlet, reducing flow separation and turbulence. The curvature is specifically designed to match the flow patterns of high viscosity fluids, minimizing hydraulic losses while maintaining manufacturing feasibility through standard forming processes.
2Loss of energy
If conventional impeller design with full shroud is used, then manufacturing is simpler, but disk friction loss increases for high viscosity fluids
Solution Approach 1:
The patent extracts or removes portions of the impeller shroud to create a cut-back design. By removing material from the shroud areas, the patent reduces the surface area where disk friction occurs. This is particularly important for high viscosity fluids that create significant friction losses on the impeller surfaces. The cut-back shroud maintains structural integrity while minimizing the harmful friction effects.
Solution Approach 2:
The impeller design applies local quality changes by having different shroud configurations in different regions. The shroud is present in some areas to maintain structural support and seal, while being removed or reduced in other areas to minimize disk friction. This localized variation in shroud presence optimizes the balance between structural requirements and friction reduction for high viscosity fluid applications.
3Loss of energy
If high impeller blade angle and low blade count are used, then pressure recovery is improved, but the device complexity increases
Solution Approach 1:
The patent changes key impeller design parameters: increasing the blade angle and decreasing the blade count. These parameter modifications are specifically optimized for high viscosity fluids, where larger blade angles provide better pressure recovery by more effectively converting kinetic energy to pressure energy. The reduced blade count minimizes the number of flow separations and turbulence generators. These parameter changes are implemented through standard impeller manufacturing processes, balancing performance improvement with manufacturing feasibility.
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 optimized design reduces hydraulic loss and improves pressure recovery, enhancing the performance of ESPs in high viscosity applications by minimizing total head loss and disk friction.
Implementation Method 1
the impeller, which centrifuges the fluid radially outward such that the fluid gains energy in the form of velocity
Implementation Method 2
the fluid flows into the associated diffuser, where fluid velocity is converted to pressure
Data Source
AI summary
An electric submersible pump stage optimized for viscous fluid is provided. The stage can include a diffuser having a curved break water area. The stage can include an impeller having a cut back shroud and/or hub.