Detecting Incremental Oil via Compositional Signatures
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Solution Overview
Problem
Current methods lack a reliable way to detect incremental oil production during a low salinity waterflood in oil reservoirs, especially when there is no baseline high salinity waterflood for comparison, making it difficult to manage and optimize low salinity waterflood operations effectively.
Innovation Solution
A method involving taking baseline and post-flood samples of oil to establish compositional signatures using High Resolution Mass Spectrometry (HRMS), identifying differences in these signatures to detect incremental oil production, and utilizing surveillance wells to predict the breakthrough time of low salinity water, allowing for optimized sampling and management of the waterflood process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If low salinity waterflood is implemented without baseline high salinity waterflood for comparison, then oil recovery can be enhanced through low salinity effects, but the ability to detect and measure incremental oil production is lost
Solution Approach 1:
The patent introduces compositional signatures of oxygen-containing organic compounds as an intermediary marker to detect incremental oil production. Instead of directly comparing production rates between high and low salinity floods, the method uses chemical composition changes in the produced oil as a mediator to indicate the presence of incremental oil recovery from low salinity effects.
Solution Approach 2:
The patent replaces the mechanical/comparative approach of running parallel high and low salinity waterfloods with a chemical analysis approach. By substituting the need for physical comparison systems with spectroscopic analysis (NMR, FTIR, or GC-MS) of oil compositional signatures, the method enables incremental oil detection without requiring baseline high salinity flood operations.
2Measurement precision
If frequent oil sampling is conducted to detect incremental production, then detection accuracy improves, but operational complexity and costs increase
Solution Approach 1:
The patent performs preliminary characterization of the baseline oil compositional signature before initiating the low salinity waterflood. By establishing reference profiles of oxygen-containing organic compounds in advance, the method enables later detection of incremental oil through comparison with this pre-established baseline, reducing the need for complex real-time analysis systems.
Solution Approach 2:
The method implements a feedback mechanism where compositional signature analysis results are continuously monitored and compared against baseline profiles. When characteristic changes indicating incremental oil are detected, this feedback triggers optimized sampling frequency adjustments and confirms the effectiveness of the low salinity waterflood, reducing unnecessary sampling while maintaining detection accuracy.
3Quantity of substance
If low salinity waterflood is used in secondary recovery mode, then oil recovery from reservoirs with depleted natural pressure can be achieved, but there is no baseline high salinity waterflood data for comparison
Solution Approach 1:
The patent creates a chemical fingerprint copy of the baseline oil composition through detailed analysis of oxygen-containing organic compounds before low salinity injection begins. This compositional signature serves as a reference copy that can be compared against future produced oil samples, preserving the baseline information in chemical form rather than requiring actual baseline flood operation data.
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 the detection of incremental oil production and improved management of low salinity waterfloods by identifying characteristic changes in oil compositional signatures and predicting the arrival of incremental oil, thereby optimizing oil recovery and reducing unnecessary sampling.
Implementation Method 1
analyzed using High Resolution Mass Spectrometry (HRMS)
Data Source
AI summary
A method for detecting incremental oil production from an oil-bearing reservoir includes taking a baseline sample of the oil and analyzing the baseline sample of oil to establish a baseline compositional signature for the oxygen-containing organic compounds in the oil. In addition, the method includes commencing a low salinity waterflood by injecting a low salinity water into the reservoir from an injection well. Further, the method includes recovering oil from a production well. Still further, the method includes taking post-flood samples of the oil produced from the production well over time. The method also includes analyzing the post-flood samples of oil to establish post-flood compositional signatures for the oxygen-containing organic compounds in the oil. Moreover, the method includes identifying a difference between one or more of the post-flood compositional signatures and the baseline compositional signature that is characteristic of incremental oil released by the low salinity waterflood.