ESP Inverse Venturi Flow Meter for Downhole Measurement
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Solution Overview
Problem
Existing downhole flow measurement technologies for electric submersible pumps (ESP) face challenges in accurately measuring flow rates using venturi principles, particularly in varying wellbore geometries and multi-phase flows, often requiring additional external equipment and complex configurations.
Innovation Solution
An inverse venturi structure is integrated into the ESP gauge assembly, utilizing the wellbore casing as the venturi path with multiple pressure sensing locations and adjustable sleeves to measure differential pressure, allowing for flow computation using the Bernoulli Equation, and enhanced by a centralizer for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional venturi flow meters are used in downhole applications, then flow measurement capability is provided, but additional external equipment and complex configurations are required
Solution Approach 1:
The patent combines the venturi flow measurement structure with the ESP gauge assembly into a single integrated unit. The venturi throat is formed within the gauge housing, eliminating the need for separate external venturi equipment and complex downhole installations. This merging achieves both simplified configuration and maintained measurement precision through direct integration of pressure sensing ports into the venturi structure.
2Volume of moving object
If venturi meters with internal constrictions are used, then flow measurement is enabled, but the device size increases requiring larger equipment
Solution Approach 1:
Instead of using the conventional approach of creating a venturi by reducing internal diameter, this patent inverts the concept by using the wellbore casing as the external boundary and creating the venturi effect through an internal structure that utilizes the annular space between the casing and the pump assembly. This inversion allows flow measurement without requiring large external equipment while maintaining measurement precision through proper differential pressure sensing.
3Measurement precision
If multiple pressure sensing locations are added to account for gauge positioning variations, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by positioning pressure sensing ports at specific locations on the gauge housing that are optimized for detecting differential pressure across the venturi throat. The sensing ports are strategically placed to capture pressure differences while accounting for potential gauge positioning variations, achieving accurate flow measurement through localized sensor placement rather than requiring multiple sensors throughout the assembly.
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 configuration enables accurate and reliable flow measurement without additional external lines, improving measurement accuracy and turbulence, thus facilitating efficient data transmission to the surface for real-time interpretation.
Implementation Method 1
Multiple (at least two) pressure sensing locations are provided in case the gauge that defines the venturi path is disposed off center in the bore or if the bore is on an incline
Implementation Method 2
allowing for flow computation using the Bernoulli Equation
Implementation Method 3
A centralizer can add turbulence and improve measurement accuracy
Data Source
AI summary
A venturi structure is supported below an ESP preferably off its gauge assembly below its motor so that the surrounding casing or wellbore defines the venturi path leading to the suction connection of the ESP. Multiple pressure sensing locations are provided in case the gauge that defines the venturi path is disposed off center in the bore or if the bore is on an incline. The gauge can receive forms of different sizes depending on the size of the surrounding tubular where the forms use an incline of preferably 15-20 degrees and allow for measuring differential near the perforations and at the constriction location so that the flow can be computed using the Bernoulli Equation.