Abstract
In gas condensate reservoirs, the dew point pressure (PDew) plays a significant role in gas and liquid assessment, reservoir characterisation, surface facility design, and reservoir simulation. Although field and laboratory measurements of PDew give accurate results, both approaches are time-consuming and resource-intensive; hence, a fast and accurate determination of PDew is very important. Equation of states (EoS) and empirical correlations are other alternative methods that are used for PDew determination. However, these methods are unable to fully capture the non-linear and complex relationships between fluid composition and PDew. Machine Learning (ML) methods, as reliable tools, have emerged in different aspects of engineering. In this study, for the first time, the application of different decision tree-based methods for the prediction of PDew is investigated. A comprehensive database, containing 681 samples (almost all the available experimental data set of pure and impure samples published from 1942 to 2018), is collected from open literature and different decision tree-based methods namely Decision Tree (DT), Random Forest (RF), Gradient Boosting (GB), and Extremely Randomised Tree (ET) are used for modelling. The statistical analysis of developed models' performance showed that the ET method yields the best predictions by Root Mean Squared Error (RMSE) and R2 values of 441 psi and 0.9227, respectively for the testing dataset. Moreover, the results show that the novel ET model has a better performance compared with existing models in the literature and EoSs for the prediction of PDew of gas condensate reservoirs.
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Data availability
The datasets analysed during the current study are available from the corresponding author upon request.
Abbreviations
- A:
-
Arithmetic
- AD:
-
Applicability domain
- ACE:
-
Alternating conditional expectations
- AI:
-
Artificial intelligence
- ANFIS:
-
Adaptive neuro-fuzzy inference system
- ANN:
-
Artificial neural network
- BR:
-
Bayesian regularization
- CCE:
-
Constant composition expansion
- CMIS:
-
Committee machine intelligent system
- COA:
-
Cuckoo optimization algorithm
- CSA:
-
Coupled simulated annealing
- CV:
-
Cross-validation
- CVD:
-
Constant volume depletion
- DT:
-
Decision tree
- EGPR:
-
Evolutionary gaussian processes regression
- EoS:
-
Equation of state
- ET:
-
Extremely randomized tree
- FL:
-
Fuzzy logic
- G:
-
Geometric
- GA:
-
Genetic algorithm
- GB:
-
Gradient boosting
- GEP:
-
Gene expression programming
- GRG:
-
Generalized reduced gradient
- H:
-
Hat Matrix
- LM:
-
Levenberg–Marquardt
- LSSVM:
-
Least-squares support-vector machines
- MGGP:
-
Multi-gene genetic programming
- MKF:
-
Mixed kernels function
- ML:
-
Machine learning
- MLP:
-
Multi-layer perceptron
- NN:
-
Neural network
- OOB:
-
Out of bag
- PR:
-
Peng robinson
- PSO:
-
Particle swarm optimization
- PVT:
-
Pressure–Volume–Temperature
- RBF:
-
Radial basis function
- RF:
-
Random forest
- RK:
-
Redlich–Kwong
- SCEUA:
-
Shuffled complex evolution
- SCG:
-
Scaled conjugate gradient
- SRK:
-
Soave–Redlich–Kwong
- SSA:
-
Salp swarm algorithm
- SVM:
-
Support-vector machines
- SW:
-
Schmidt–Wenzel
- ZJ:
-
Zudkevitch–Joffe
- C 1 :
-
Methane concentration (Fraction)
- C 2 :
-
Ethane concentration (Fraction)
- C 3 :
-
Propane concentration (Fraction)
- C 4 :
-
Butane concentration (Fraction)
- C 5 :
-
Pentane concentration (Fraction)
- C 6 :
-
Hexane concentration (Fraction)
- C 7 + :
-
Heptane plus concentration (Fraction)
- CO 2 :
-
Carbon dioxide concentration (Fraction)
- h :
-
Hat values
- h * :
-
Warning leverage
- H 2 S :
-
Hydrogen sulphide concentration (Fraction)
- MAE :
-
Mean absolute error (%)
- MAPE :
-
Mean absolute percentage error (%)
- Max :
-
The maximum value
- max_depth :
-
Maximum depth of a DT
- max_features :
-
Maximum features to be used in the development of a DT model
- Mean :
-
The mean value
- Min :
-
The minimum value
- MPE :
-
Mean percentage error (%)
- MSE :
-
Mean squared error
- MW C7 + :
-
Molecular weight of heptane plus fraction (g/mol)
- n_estimator :
-
Number of estimators (trees) used in ensembled models
- N 2 :
-
Nitrogen gas concentration (Fraction)
- P :
-
Pressure (psi)
- P Dew :
-
Dew point pressure (psi)
- Res :
-
Residual (psi)
- R 2 :
-
Coefficient of determination
- RMSE :
-
Root mean squared error (psi)
- SD :
-
Standard deviation (psi)
- SR :
-
Standard residual
- SG C7 + :
-
The specific gravity of heptane plus fraction
- SMAPE :
-
Symmetric mean absolute percentage error (%)
- t :
-
Target value (psi)
- T :
-
Temperature (°F)
- WMAPE :
-
Weighted mean absolute percentage error (%)
- y :
-
Predicted value (psi)
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Appendix: Instruction on how to use the developed models
Appendix: Instruction on how to use the developed models
The developed models are provided for the users. The models work using Python. The input data are received from an excel file. After the models predicted the outputs, they will be printed in the same excel file, in the sheet "Output". The model files and the code are also provided as supplementary files.
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Esmaeili-Jaghdan, Z., Tatar, A., Shokrollahi, A. et al. Machine learning modelling of dew point pressure in gas condensate reservoirs: application of decision tree-based models. Neural Comput & Applic 36, 1973–1995 (2024). https://doi.org/10.1007/s00521-023-09201-9
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DOI: https://doi.org/10.1007/s00521-023-09201-9