Real-Time API Gravity Estimation in Crude Oil Flowlines
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Solution Overview
Problem
Conventional methods for determining the API gravity of crude oil in real-time, especially in complex blends from multiple wells, are impractical as they require manual sampling and disrupt fluid flow, lacking the ability to estimate and control API gravity directly in a pipeline without external sampling lines or pumps.
Innovation Solution
A system using dual pressure-temperature transducers inserted into vertically spaced taps in a pipeline allows for real-time estimation and management of fluid characteristics, including API gravity, by determining pressure and temperature differences to calculate density and specific gravity, and adjusting flow rates to maintain desired API gravity levels without disrupting the fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual sampling and laboratory analysis are used to determine API gravity, then measurement precision can be achieved, but the method disrupts fluid flow and is not practical for real-time estimation in complex blends
Solution Approach 1:
The patent replaces manual mechanical sampling and laboratory analysis with an automated in-line measurement system using density meters and flow rate sensors. The system continuously measures density and flow rate in the pipeline, eliminating the need for manual sampling while providing real-time API gravity estimation for complex crude blends.
Solution Approach 2:
The patent implements continuous real-time measurement of density and flow rate in the pipeline, replacing intermittent manual sampling. The system continuously monitors fluid characteristics and provides ongoing API gravity estimation, enabling real-time control decisions for maintaining desired crude oil quality.
2Measurement precision
If external sampling lines and pumps are added to measure fluid characteristics, then measurement capability is improved, but device complexity and disruption to fluid flow increase
Solution Approach 1:
The patent merges the measurement function directly into the existing pipeline system by installing density meters and flow rate sensors in-line with the crude oil flow. This eliminates the need for separate external sampling lines and pumps, reducing system complexity while maintaining measurement capability.
Solution Approach 2:
The system uses the crude oil flow itself to drive the measurement process through in-line density meters and flow rate sensors that continuously monitor fluid characteristics without requiring external sampling infrastructure. The pipeline's own flow provides the mechanism for continuous measurement.
3Manufacturing precision
If flow rates of individual wells are adjusted to maintain desired API gravity, then product quality is improved, but the need for real-time monitoring and control increases operational complexity
Solution Approach 1:
The patent implements a feedback control system that continuously monitors density and flow rate, calculates API gravity in real-time, and provides feedback signals to flow control valves. This automated feedback loop enables precise quality control by adjusting well flow rates based on actual measured characteristics without requiring complex manual control systems.
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 real-time estimation and management of API gravity in crude oil streams within a pipeline, ensuring the API gravity remains within desired limits without the need for external sampling or extraction pumps, thus optimizing crude oil production and maintaining consistent quality.
Implementation Method 1
determining pressure and temperature differences between the two locations to calculate density and specific gravity
Implementation Method 2
determining fluid temperature at the first location and the second location... estimating specific gravity of the crude oil at standard condition... estimating API gravity of the crude oil at standard condition
Implementation Method 3
a vertically oriented extent substantially vertically oriented so that the crude oil flowing through the vertically oriented extent flows downward between a first location and a second location
Data Source
AI summary
Systems, program product, and methods to estimate and manage flowing fluid characteristics of a fluid stream flowing through a pipeline in real-time, are provided. A system can include a vertically oriented extent of a pipeline for transporting crude oil, a pair of spaced vertically apart sensors or sensor assemblies connected to the vertically oriented extent to obtain pressure and temperature readings of the crude oil, a controller in communication with the pair of sensors or sensor assemblies, and crude oil analysis and management program product stored in the memory of the controller and adapted to determine or estimate density, specific gravity, and API gravity of the crude oil to thereby manage flowing fluid characteristics of the crude oil.