Abstract

AbstractThe rate of penetration (ROP) optimization is one of the most important factors in improving drilling efficiency, especially in the downturn time of oil prices. This process is crucial in the well planning and exploration phases, where the selection of the drilling bits and parameters has a significant impact on the total cost and time of the drilling operation. Thus, the optimization and best selection of the drilling parameters are critical. Optimization of ROP is difficult due to the complexity of the relationship between the drilling variables and the ROP. For this reason, the development of high-performance computer systems, predictive models, and algorithms will be the best solution. In this study, a new investigation approach for ROP optimization has been done regarding different ROP models (Maurer, Bingham, Bourgoyne and Young models), algorithms (Multiple regression, ant colony optimization (ACO), fminunc, fminsearch, fsolve, lsqcurvefit, lsqnonlin), and different objective functions. The well-known data from the Louisiana field in an offshore well have been used to compare the used parameter estimation approach with other techniques. Indeed, datasets from an onshore well in the Hassi Messaoud Algerian field are explored. The results confirmed the superiority and the effectiveness of B&Y models compared to Bingham and Maurer models. Fminsearch, lsqcurvefit, ACO, and Excel (GRG) algorithms give the best results in ROP prediction while the application of the MNLR approach. Using the mean squared error (MSE) and the determination coefficient (R$$^{2}$$2) as objective functions significantly increases the accuracy prediction where the results given are ($$R=0.9522$$R=0.9522,$$RMSE=2.85$$RMSE=2.85) and ($$R= 0.9811$$R=0.9811,$$RMSE=4.08$$RMSE=4.08) for Wells 1 and 2, respectively. This study validates the application of B&Y model in both onshore and offshore wells. The findings reveal to deal with data limitation problems in ROP prediction. Simple and effective optimization techniques that require less memory space and computational time have been provided.

Highlights

  • One of the main goals of drilling optimization is to reduce the total time, maintain the risks as low as possible, save costs, and increase efficiency, especially in the early stage of the drilling project

  • We concluded that the best model to predict rate of penetration (ROP) is B&Y model for the Algerian fields which can be used as a robust and precise equation to predict ROP in future wells by means of this employed approach and objective functions, and the results can be applied in the same field while the coefficient equation can be tuned for wells in other fields

  • – ROP modeling: we found that the B&Y model outperforms the published ROP models (Bingham and Maurer) with the highest correlation coefficient and the lowest RMSE (R=0.9522, RMSE=2.85) and (R= 0.9811, RMSE=4.08) for well 1 and 2 respectively

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Summary

Introduction

One of the main goals of drilling optimization is to reduce the total time, maintain the risks as low as possible, save costs, and increase efficiency, especially in the early stage of the drilling project (planning and exploration phases). Bourgoyne and Young (1974) established one of the most important drilling optimization studies and developed an empirical model to predict the rate of penetration based on several drilling parameters. Maidla and Ohara (1991) developed an optimization software for roller-cone bits toward the best selection of WOB, RPM, bit type, and bit wearing to minimize the drilling costs They concluded that the drilling model performances depend on the quality of the data used to calculate the model’s coefficient. Bataee et al (2014) used shuffled frog leaping algorithm as a function of WOB, RPM, and flow rate They developed an ANN model using about 1810 data-point to train the model and to predict ROP. The optimization techniques applied to identify the unknown parameters of the selected model are represented below

Optimization methods
Objective functions
Case study 2
Findings
Summary and conclusions
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