Downhole Spectrometer for Real-Time Asphaltene Onset Detection
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Solution Overview
Problem
Asphaltene deposition in crude oil during production can impede hydrocarbon flow and pipeline plugging, as the solubility of asphaltenes decreases with pressure, making it challenging to detect onset conditions and content in real-time within wells.
Innovation Solution
A method and apparatus for downhole tools that measure optical properties of crude oil before and after asphaltene aggregation, using spectrometry to determine asphaltene onset pressure and content by passing crude oil through filters, allowing for real-time analysis and aggregation separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downhole tools are used to measure crude oil properties in real-time, then production monitoring efficiency is improved, but device complexity increases
Solution Approach 1:
The downhole tool integrates multiple functions including pressure measurement, optical property measurement via spectrometer, and asphaltene aggregation control within a single device. This multi-functionality improves production monitoring efficiency while managing device complexity by combining previously separate measurement capabilities into one unified tool that can operate downhole without requiring multiple separate instruments.
2Measurement precision
If asphaltene aggregation is induced to separate asphaltenes from crude oil, then measurement precision of asphaltene content is improved, but loss of substance occurs
Solution Approach 1:
The method extracts aggregated asphaltenes from the crude oil stream through filtration after inducing aggregation by lowering pressure. This extraction allows for precise measurement of asphaltene content by separating them from the bulk crude oil, enabling accurate quantification while minimizing loss by collecting the aggregated asphaltenes on a filter rather than discarding them with the flow.
3Measurement precision
If pressure is lowered to induce asphaltene aggregation, then detection accuracy of onset conditions is improved, but hydrocarbon flow may be impeded
Solution Approach 1:
The system performs preliminary measurements of optical properties at downhole conditions before inducing asphaltene aggregation by lowering pressure. This preliminary action allows detection of the asphaltene onset condition at the actual production pressure, and the aggregation is then induced in a controlled manner to confirm the onset point, ensuring detection accuracy while managing flow impairment through controlled pressure reduction.
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 and timely detection of asphaltene onset conditions and content within wells, facilitating improved hydrocarbon production by preventing pipeline plugging and flow impairment.
Implementation Method 1
A second measurement of the optical property of the crude oil is taken after separating the aggregated asphaltenes and an asphaltene onset condition of the crude oil is determined through comparison of the first and second measurements of the optical property
Implementation Method 2
aggregating asphaltenes in the crude oil after taking the first measurement of the optical property and then separating aggregated asphaltenes from the crude oil
Data Source
AI summary
A method for determining an asphaltene onset condition of a crude oil is provided. The method includes receiving a crude oil within a downhole tool inside a well and taking a first measurement of an optical property of the received crude oil. The method also includes lowering the pressure or temperature of the crude oil after taking the first measurement of the optical property to cause aggregation of asphaltenes in the crude oil, and then separating aggregated asphaltenes from the crude oil. Further, the method includes taking a second measurement of the optical property of the crude oil within the downhole tool after separating aggregated asphaltenes from the crude oil and determining an asphaltene onset condition of the crude oil through comparison of the first and second measurements of the optical property. Additional methods, systems, and devices are also disclosed.