Oil Sample Provenance Through Precomputed Geochemical Allocation
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Solution Overview
Problem
Existing methods for determining the provenance of oil samples from multiple geological levels in hydrocarbon wells require chemical and geochemical knowledge, leading to increased calculation times and resource consumption, and often suffer from interference from oil-based mud during drilling.
Innovation Solution
A method using chromatographic composition data and linear discriminant analysis or maximum likelihood estimation to determine the contribution of each geological level to an oil sample without prior chemical knowledge, optimizing data processing and reducing resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chemical and geochemical knowledge is used to solve the system of equations for geochemical allocation, then the accuracy of provenance determination is improved, but the calculation time and resource consumption increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the inverse of the matrix containing geochemical composition data of end-member oils from different geological levels. This pre-computed inverse matrix is then reused during the allocation process, eliminating the need to solve complex systems of equations in real-time. The method transforms the original system into a simple matrix multiplication operation, significantly reducing calculation time while maintaining accuracy.
Solution Approach 2:
The patent replaces the traditional mechanical approach of iteratively solving systems of equations with chemical and geochemical knowledge with a streamlined mathematical approach using pre-computed matrix inverses. This substitution transforms a computationally intensive process into an efficient matrix operation, reducing both calculation time and resource consumption while preserving measurement precision.
2Ease of operation
If oil-based mud is used during drilling, then the drilling process is facilitated, but interference with the geochemical analysis of oil samples occurs
Solution Approach 1:
The patent applies the taking out principle by selectively extracting and analyzing only those geochemical parameters that are not affected by oil-based mud contamination. The method identifies and focuses on specific compositional characteristics of the oil that remain reliable indicators of geological provenance despite the presence of mud-derived organic compounds, thereby maintaining analysis reliability while acknowledging the operational necessity of oil-based drilling muds.
3Quantity of substance
If multiple geological levels contribute to the oil sample, then the total hydrocarbon production is increased, but the determination of provenance becomes more complex
Solution Approach 1:
The patent handles multiple geological level contributions by pre-computing the inverse matrix from the geochemical compositions of all relevant end-member oils. This pre-computed inverse captures the relationships between multiple sources, allowing the allocation calculation to proceed as a simple matrix multiplication even when many geological levels contribute to the mixture, thereby managing complexity efficiently.
Solution Approach 2:
The patent creates a universal solution that works for any number of contributing geological levels through the use of matrix mathematics. The same pre-computed inverse matrix approach can handle allocations from two levels or dozens of levels without increasing computational complexity, making the method universally applicable to diverse multi-source production scenarios.
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 method provides accurate determination of geological levels contributing to oil samples with reduced calculation time and resource use, improving the precision of well management strategies.
Implementation Method 1
chromatographic composition data, as well as other characteristics of the produced oil
Data Source
AI summary
A method for determining the geological levels of reservoirs contributing to a sample from a produced oil well, by means of chromatographic composition data, as well as other characteristics of the produced oil and pure samples of oil originating from each of the different geological levels contributing to the sample. The method provided by the invention may be advantageously implemented in a computer.
