Four-Phase Flow Measurement Using Nuclear Attenuation
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Solution Overview
Problem
Current systems fail to accurately measure four-phase fluid flow, particularly in heavy oil production, where viscous fluids require diluents, leading to challenges in friction reduction and fluid behavior analysis, and existing multiphase flow meters are not capable of real-time monitoring without additional sensors or complex calibration.
Innovation Solution
A system utilizing nuclear measurements with multiple gamma/X-Ray energy levels to discriminate phases, combined with differential pressure measurements, allows for real-time monitoring of oil, water, gas, and diluent flow rates without additional sensors or site calibration, employing a fractional measurement device and behavioral modeling to estimate fluid properties and flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional multiphase flow meters are used to measure four-phase fluid flow, then measurement capability is provided, but measurement precision is insufficient and additional sensors or complex calibration are required
Solution Approach 1:
The flowmeter is designed to measure all four phases (oil, water, gas, and diluent) simultaneously using a single integrated nuclear measurement system, eliminating the need for multiple separate sensors or complex calibration procedures. The system uses gamma-ray attenuation measurements that can distinguish between all four phases based on their unique density and compositional characteristics.
Solution Approach 2:
The system changes the measurement parameter from traditional mechanical or electrical sensors to nuclear gamma-ray attenuation, which provides a fundamental difference in how phases are detected. By measuring attenuation at multiple energy levels, the system can uniquely identify and quantify each phase without requiring additional sensors or site-specific calibration.
2Productivity
If real-time monitoring is implemented without additional sensors, then productivity is improved, but measurement precision may be compromised
Solution Approach 1:
The nuclear measurement system provides continuous real-time monitoring of all four phases without interruption or delay. The gamma-ray attenuation measurement is inherently continuous and does not require the mechanical moving parts or sampling procedures that would introduce discontinuities, ensuring both real-time capability and maintained precision throughout the measurement process.
Solution Approach 2:
The system uses the inherent physical properties of the fluid phases themselves (their density and compositional characteristics) as the measurement medium, eliminating the need for external sensors or calibration standards. The gamma rays interact directly with the phases to provide measurement data, making the system self-sufficient and eliminating calibration requirements.
3Ease of operation
If diluent injection rate is varied to optimize fluid flow, then fluid behavior is improved, but measurement reliability becomes dependent on injection rate
Solution Approach 1:
The gamma-ray attenuation measurement serves as an intermediary that directly measures the physical properties of the phases regardless of the diluent injection rate. The system measures density and compositional parameters that are intrinsic to the phases themselves, rather than relying on flow conditions or injection rates to maintain measurement validity. This allows accurate measurement across all operating conditions.
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
Enables accurate, real-time measurement of four-phase fluid flow, reducing operational costs and improving fluid behavior analysis, with enhanced reliability and robustness, independent of diluent injection rates and flow calibration, suitable for subsea to surface pipelines.
Implementation Method 1
The exemplary systems and methods can be based on novel technology for nuclear measurements, and can be based on solving fundamental problems in the background art and the use of the properties of the nuclear measurement by combining at least three gamma/X-Ray energy levels to measure each phase of a four phase fluid flow
Data Source
AI summary
A system, method and apparatus for measuring fluid properties of a fluid flow having four phases, including a fractional measurement device configured to determine respective fractional measurements of each of four phases of fluids flowing in a fluid flow; and a behavioral modeling device configured to determine, based on the respective fractional measurements of each of the four phases of fluids, respective flow rates for each of the four phases of fluids.