An approach for optimization of controllable drilling parameters for motorized bottom hole assembly in a specific formation

Yavari H. Fazaelizadeh M. Aadnoy B.S. Khosravanian R. Qajar J. Sedaghatzadeh M. Riazi M.
December 2023 Elsevier B.V.

Results in Engineering
2023 #20

This study focuses on optimizing drilling parameters when using Positive Displacement Motors (PDMs). In drilling operations involving mud motors, weight-on-bit (WOB) alterations lead to variations in the systems parasitic pressure drop. Consequently, this affects the optimum flow rate and the hydraulic power of the bit. Also, if the flow rate changes, the bits rotations per minute (RPM) also change. In other words, using PDMs creates a link between the hydraulic system and the drilling speed, such that changing drilling parameters such as the WOB causes changes in the hydraulic systems performance. Therefore, one possible way to optimize the drilling parameters is to consider the drilling rate and hydraulic system simultaneously using a multi-objective approach. This study used an integrated approach encompassing data mining and mathematical modeling, employing a multi-objective framework to identify optimal parameters. The approach was applied to Dariyan Formation drilling data. The data mining approach revealed a well-distributed data set covering optimal and suboptimal zones suitable for optimization. In data mining, the identification of optimal conditions included a WOB of 11500 lb, a rotation speed of 105.8 rev/min, and a flow rate of 843 gpm, leading to an ROP of 44.23 ft/h. In multi-objective optimization, the optimal parameters consisted of a WOB of 14480 lb, a rotation speed of 115 rev/min, and a flow rate of 920.8 gpm, resulting in an ROP of 40.49 ft/h. Comparing optimal results with the drilling data shows a substantial MSE reduction of over 35 %. The results show the good performance of this approach in detecting the optimal and non-optimal drilling variables.

Hydraulic system , Mechanical specific energy , Multi-objective optimization , Positive displacement motor , Rate of penetration

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Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran
Department of Petroleum Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran
Department of Energy and Petroleum Engineering, University of Stavanger, Stavanger, Norway
Department of Earth Sciences, Utrecht University, Utrecht, Netherlands
Department of Petroleum Engineering, School of Chemical and Petroleum Engineering, Shiraz University, Shiraz, Iran
National Iranian Drilling Company, Ahvaz, Iran
School of Mining and Geosciences, Nazarbayev University, Astana, Kazakhstan
Enhanced Oil Recovery (EOR) Research Centre, IOR/EOR Research Institute, Shiraz University, Shiraz, Iran

Department of Petroleum Engineering
Department of Petroleum Engineering
Department of Energy and Petroleum Engineering
Department of Earth Sciences
Department of Petroleum Engineering
National Iranian Drilling Company
School of Mining and Geosciences
Enhanced Oil Recovery (EOR) Research Centre

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