EFP Probe Condensate Measurement via Dielectric Analysis
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Solution Overview
Problem
Current methods for accurately identifying and measuring the volume fractions of condensates in natural gas, particularly those transiently and periodically released in natural gas wells, are hindered by the intermittent nature of slug releases and the difficulty in distinguishing between hydrocarbon components and methane, leading to inaccurate and inconsistent measurements.
Innovation Solution
A method utilizing electric field perturbation (EFP) probes and time domain reflectometry (TDR) to measure the dielectric constants and resonance points of fluid components within a pipe, correlating these with pre-determined values to identify and quantify condensates, especially during the initial phase of slug releases when concentrations are highest and methane dilution is minimal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three-phase separators are used to identify and measure condensates, then separation of hydrocarbon components is achieved, but the equipment is large, expensive, maintenance intensive and provides information only after long intervals
Solution Approach 1:
The patent replaces the mechanical three-phase separator system with an electromagnetic field-based measurement system using EFP probes and time domain reflectometry. This substitution eliminates the need for large separation equipment while achieving continuous, real-time measurement of condensate volume fractions through dielectric constant measurements and resonance point analysis
Solution Approach 2:
The invention creates a measurement model that correlates dielectric constant measurements and resonance points with known condensate compositions. By building this reference model, the system can identify and quantify condensates in real-time without physical separation, effectively copying the analytical capability of laboratory analysis into a continuous field measurement system
2Measurement precision
If three-phase separators are operated periodically for well certification, then component identification is achieved, but continuous monitoring of transient slug releases is not available
Solution Approach 1:
The EFP-based measurement system operates continuously, providing uninterrupted real-time measurement of condensate volume fractions throughout transient slug releases. The system maintains continuous electromagnetic field interaction with the flowing fluid, enabling continuous data acquisition without the periodic interruptions inherent in traditional certification-based measurement approaches
Solution Approach 2:
The system is pre-calibrated with known dielectric constants and resonance points of various hydrocarbon components before deployment. This preliminary characterization enables immediate, accurate identification and quantification of condensates during transient releases without requiring prior separation or certification events
3Measurement precision
If measurements are taken during transient slug releases, then accurate condensate characterization is achieved, but the intermittent nature of releases makes consistent measurement difficult
Solution Approach 1:
The measurement system dynamically adapts to changing flow conditions during transient slug releases. The EFP probes continuously track changes in dielectric constant and resonance points as the composition and velocity of the fluid mixture change, maintaining accurate measurements throughout the dynamic transient event rather than requiring steady-state 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 continuous, accurate characterization and measurement of condensate volume fractions, improving the economic valuation of natural gas production by providing real-time data on transient releases, even in conditions where traditional three-phase separators are ineffective.
Implementation Method 1
providing an electrical pulse emitter which, when energized, generates a given electrical pulse which is electrically delivered to the probe, and wherein the electrical pulse electrically travels along the known length dimension of the probe, and further generates an electrical pulse reflection
Implementation Method 2
the at least one condensate each have a previously determined, and known, dielectric constant, and/or a previously determined, and known, resonance point
Implementation Method 3
wherein the resonance point of the major volume fraction constituent, and/or the resonance point of the at least one condensate are individually calculated by the computer from the determined time periods
Data Source
AI summary
A method for identifying and characterizing a condensate entrained in a fluid using time domain analysis and frequency domain analysis to identify individual volume fraction constituents and condensates within a pipe on a real time basis and to measure the volume of the individual volume fraction constituents and condensates flowing through the pipe on a real time basis.