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Abstract
Current oil prices and global financial situations underline the need for the best engineering practices to recover remaining hydrocarbons. A good understanding of the elastic behavior of the reservoir rock is extremely imperative in avoiding the severe well drilling problems such as wellbore in-stability, differential sticking, kicks, and many more. Therefore, it is plausible to have a good estimation of the rock elastic behavior for successful well operations. This study presents a generalized empirical model to predict static Poisson’s ratio of the carbonate rocks. Petrophysical well logs were used as inputs, and the laboratory measured static Poisson’s ratio was used as an output. Three supervised artificial intelligence (AI) techniques were used, viz. artificial neural network (ANN), support vectors regression, and adaptive network-based fuzzy interference system. An extensive prediction comparison was made between these three AI techniques. Based on the lowest average absolute percentage error (AAPE) and highest coefficient of determination (R2), the ANN model proposed to be the best model to predict static Poisson’s ratio. To transform black box nature of AI model into a white box, ANN-based empirical correlation is also developed to predict the static Poisson’s ratio. Comparison of the developed empirical correlation with previously established approaches to find static Poisson’s ratio on an unseen published dataset revealed that the equation of ANN can predict the static Poisson’s ratio with implicitly less AAPE and with highR2 value. The proposed model with the empirical correlation can assist geo-mechanical engineers to predict the static Poisson’s ratio in the absence of core data. The novelty of the new equation is that it can be used without the need of any AI software.
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- APE:
Absolute percentage error
- AAPE:
Average absolute percentage error
- ANFIS:
Adaptive neuro-fuzzy inference system
- ANN:
Artificial neural network
- CC:
Correlation coefficient
- FFNN:
Feedforward neural network
- LVDT:
Linear variable differential transducer
- MLP:
Multilayer perceptron
- PR:
Poisson’s ratio
- RBF:
Radial basis function
- RMSE:
Root mean square error
- SVR:
Support vectors regression
- UCS:
Unconfined compressive strength
- b1 :
Bias between input and hidden layer of neural network
- b2 :
Bias between hidden and output layer of neural network
- \(c_{1}\) :
Cognitive parameter\(\left( {0 \le c_{1} \le 1.2} \right)\)
- \(c_{2}\) :
Cognitive parameter\(\left( {0 \le c_{2} \le 1.2} \right)\)
- Edyn :
Dynamic Young’s modulus (MPsi)
- Estatic :
Static Young’s modulus (MPsi)
- Ed :
Dynamic Young’s modulus (MPsi)
- i :
Index for neurons
- j :
Index for number of input parameters
- \(n\) :
Iteration number
- Nh :
Total number of neurons
- PRdyn :
Dynamic Poisson’s ratio
- PRstatic :
Static Poisson’s ratio
- P-wave:
Compressional wave
- \(p_{i}\) :
Particle\(i\) position at any iteration
- \(p_{i}^{\text{b}}\) :
Particle best solution
- \(p_{\text{gb}}\) :
Global best solution
- Rhob:
Bulk density (g/cc)
- R2 :
Coefficient of determination
- S-wave:
Shear wave
- w :
Weight\(\left( {0 \le w \le 1.2} \right)\)
- \(v_{i}\) :
Weight\(\left( {0 \le w \le 1.2} \right)\)
- w1 :
Weights vector between input and hidden layer of neural network
- w2 :
Weights vector between hidden and output layer of neural network
- x :
Input parameters
- y :
Output variable
- \(\sigma_{\text{o}}\) :
Activation function between hidden and output layer of FFNN
- \(\sigma_{\text{L}}\) :
Activation function between input and hidden layer of FFNN
- Δtc :
Compressional wave transit time (µs/ft)
- Δts :
S-wave transit time (µs/ft)
- ρ :
Bulk density (g/cc)
- \(\nu_{\text{dyn}}\) :
Dynamic Poisson’s ratio
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Acknowledgements
The authors would like to acknowledge College of Petroleum & Geosciences (CPG), King Fahd University of Petroleum & Minerals for providing research opportunities to produce this paper.
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Department of Petroleum Engineering, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia
Zeeshan Tariq, Mohamed Mahmoud & Abdulazeez Abdulraheem
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Appendix A
Appendix A
Average absolute percentage error (AAPE) is defined as follows:
Root mean square error (RMSE) is defined as follows:
where\({\text{PRstatic}}\)measured is the measured value of\({\text{PRstatic}}\) and\({\text{PRstatic}}\)predicted is the estimated value from the models.k is the total number of data points.
Pearson correlation coefficient CC is defined as follows:
wherex andy are two variables.
Coefficient of determinationR2 is defined as follows:
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Tariq, Z., Mahmoud, M. & Abdulraheem, A. Core log integration: a hybrid intelligent data-driven solution to improve elastic parameter prediction.Neural Comput & Applic31, 8561–8581 (2019). https://doi.org/10.1007/s00521-019-04101-3
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