Mud-Gas Extraction Efficiency Coefficients for Reservoir Fluid Typing
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Solution Overview
Problem
Existing methods for reservoir fluid typing rely heavily on expensive advanced mud-gas data, while standard mud-gas data is widely available but lacks accurate extraction efficiency corrections, leading to low confidence in distinguishing between reservoir oil and gas using geochemical parameters.
Innovation Solution
A method to calculate extraction efficiency coefficients using an equations-of-state model, simulating gas release from drilling fluid under predetermined conditions, allowing correction of standard mud-gas data to accurately determine reservoir fluid composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard mud-gas data is used for reservoir fluid typing, then cost is reduced and data availability is improved, but measurement precision and reliability of geochemical parameters deteriorate due to lack of accurate extraction efficiency corrections
Solution Approach 1:
The patent applies preliminary action by calculating extraction efficiency coefficients before using standard mud-gas data for reservoir fluid typing. The method pre-determines correction factors based on simulated gas release from drilling fluid under predetermined conditions, allowing subsequent correction of measured geochemical parameters. This preliminary correction step enables standard mud-gas data to achieve reliability comparable to expensive advanced mud-gas data.
Solution Approach 2:
The patent implements feedback by using simulated output drilling fluid composition (derived from equations-of-state modeling) to correct measured mud-gas data. The extraction efficiency coefficients are calculated by comparing simulated gas release with actual measurements, creating a feedback loop that continuously refines the correction factors. This feedback mechanism allows the system to compensate for measurement inaccuracies in standard mud-gas data.
2Measurement precision
If advanced mud-gas data is used for reservoir fluid typing, then measurement precision and reliability are improved, but cost increases significantly
Solution Approach 1:
The patent applies copying by creating a simplified model (equations-of-state simulation) that replicates the complex physical process of gas release from drilling fluid. Instead of using expensive advanced mud-gas equipment, the method uses computational simulation to copy the essential behavior of the system, allowing standard mud-gas data to be corrected and interpreted with the same precision as advanced data would provide.
Solution Approach 2:
The patent uses cheap short-living objects by replacing expensive advanced mud-gas data acquisition with standard mud-gas data combined with computational corrections. The extraction efficiency coefficients act as disposable correction factors that can be applied to standard data to achieve advanced-level precision without the ongoing cost of expensive equipment and operations.
3Measurement precision
If extraction efficiency coefficients are calculated using equations-of-state modeling, then accuracy of gas component concentration is improved, but computational complexity increases
Solution Approach 1:
The patent applies parameter changes by using equations-of-state modeling to calculate extraction efficiency coefficients based on variations in pressure, temperature, and fluid composition. The method systematically varies these parameters through simulation to determine correction factors under different operating conditions. This parameter-based approach provides accurate gas component concentrations while maintaining manageable computational complexity through standardized thermodynamic models.
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 reservoir fluid typing using standard mud-gas data, reducing costs by avoiding noise issues and improving confidence in geochemical parameter thresholds, particularly for fields using oil-based drilling fluids.
Implementation Method 1
simulating release of a selected gas component from the simulated output drilling fluid under predetermined conditions
Implementation Method 2
An equations-of-state model is a fluid model that takes a molar composition of a fluid and predicts the phase split and volumetric behaviour of the fluid (e.g., vapour and liquid phase compositions, densities, viscosities and formation volume factors) over a range of pressures and temperature.
Data Source
AI summary
A method of calculating extraction efficiency coefficients for mud-gas analysis includes: generating a simulated output drilling fluid based on a mixture of about 1 wt. % of a reference reservoir fluid and a balance of an input drilling fluid; simulating release of gas from the simulated output drilling fluid under predetermined conditions using an equations-of-state model; and determining an extraction efficiency coefficient for each gas component based on a ratio between the composition of the reference reservoir fluid and the composition of the simulated released gas.