Wet Gas Venturi Meter Diagnostics for Multiphase Flow Accuracy
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Solution Overview
Problem
Existing methods for determining fluid flow rates in gas wells, particularly in multiple phase flow conditions, are inaccurate due to complications with turbine responses, tracer substance limitations, and reliance on specific flow regimes, leading to inefficiencies in monitoring and managing gas production as liquid content increases.
Innovation Solution
A comprehensive system and method utilizing venturi meters, pressure sensors, temperature sensors, and programmable logic controllers to calculate gas and condensate flow rates, with a creative production monitoring tool that processes data to identify and rectify issues in real-time, enhancing accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a venturi meter is used to measure gas flow rate, then accurate measurements are obtained in early stages with dry gas, but measurement accuracy deteriorates as liquid content increases to more than 5% by volume
Solution Approach 1:
The system changes the measurement parameters by introducing capacitance sensors that can detect liquid presence and turbine meter readings that respond to two-phase flow conditions. These parameter changes allow the system to detect and compensate for wet gas effects, maintaining measurement accuracy across varying liquid content conditions
Solution Approach 2:
The system implements feedback by continuously monitoring multiple parameters (venturi differential pressure, capacitance sensor readings, turbine meter speed) and using this feedback to identify when wet gas conditions occur. The system then applies correction algorithms based on the feedback signals to maintain accurate flow measurements despite changing fluid composition
2Measurement precision
If multiple venturi meters are installed to correct for liquid cut inaccuracies, then measurement accuracy improves, but system complexity and infrastructure modification requirements increase significantly
Solution Approach 1:
The system merges multiple measurement approaches by combining the venturi meter for total flow measurement with capacitance sensors for liquid detection and turbine meters for two-phase flow measurement. This integration allows the system to achieve accurate wet gas measurements using a single venturi meter rather than requiring multiple venturi meters, thereby reducing system complexity
Solution Approach 2:
The system implements multi-functionality by using the venturi meter for primary flow measurement while simultaneously employing capacitance sensors and turbine meters to detect liquid content and provide correction factors. This universal approach allows a single measurement system to handle both dry gas and wet gas conditions accurately
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 system provides accurate and reliable gas flow rate measurements, reducing errors and the need for costly infrastructure modifications by identifying and addressing problems with venturi meters, ensuring precise production monitoring and management.
Implementation Method 1
Venturi meters are flow measurement instruments which use a converging section of pipe to give an increase in the flow velocity and a corresponding pressure drop from which the flow rate can be deduced
Implementation Method 2
one or more pressure sensors configured to measure a pressure of the gas in the piping
Implementation Method 3
one or more temperature sensors configured to measure a temperature of the gas in the piping
Data Source
AI summary
Systems and methods for finding and solving problems with wet gas venturi meters in one or more gas well sites include one or more gas well sites configured to supply gas to a gas plant, each gas well site comprising a gas well connected to a piping, one or more valves installed on the piping, one or more pressure sensors, one or more temperature sensors, one or more venturi meters configured to measure a differential pressure of the gas in the piping, and one or more programmable logic controllers configured to receive the measured data from the pressure sensors, temperature sensors, and the venturi meters, receive a plurality of dimensions of the one or more venturi meters, receive a plurality of fluid properties values and, determine a first gas rate and first condensate rate for each of the well sites.