Perforation Optimization of Intensive-Stage Fracturing in a Horizontal Well Using a Coupled 3D-DDM Fracture Model

Wan Cheng, Chunhua Lu and Bo Xiao
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Wan Cheng: Exploration and Foundation Engineering, Faculty of Engineering, China University of Geosciences, No. 388 Lumo Road, Wuhan 430074, China
Chunhua Lu: Exploration and Foundation Engineering, Faculty of Engineering, China University of Geosciences, No. 388 Lumo Road, Wuhan 430074, China
Bo Xiao: SINOPEC Research Institute of Petroleum Engineering, Beijing 102200, China

Energies, 2021, vol. 14, issue 9, 1-18

Abstract: Intensive-stage fracturing in horizontal wells is a potentially new technology for reservoir stimulations of deep shale oil and gas. Due to a strong stress interaction among the dense fractures, the fracture geometry and stress field are very complicated, which are the bottlenecks of this technology. Aiming at simulating the intensive-stage fracturing, a coupled three-dimensional (3D) fracture model of multiple-fracture simultaneous propagation is proposed. The dynamic behavior of the fracture propagation and stress field was analyzed using this model. The perforation parameters were optimized for improving the fracture geometry equilibrium. The results showed that the exterior fractures of the multiple fractures penetrated by the horizontal well become the main fractures, while the interior fractures are drastically restrained. The exterior fracture widths increased with increasing injection time, while the interior fracture widths decreased with increasing injection time. An extruded region was created among the multiple fractures, which restrained the propagation of the interior fractures. Only increasing the perforation cluster number did not improve the fracture geometry equilibrium in the intensive-stage fracturing. To improve the fracture geometry equilibrium, we suggest designing more perforation numbers in each perforation cluster and ensuring that both the perforation number and diameter in the interior perforation cluster are greater than those of the exterior ones.

Keywords: hydraulic fracturing; horizontal well; stress interaction; reservoir stimulation; shale gas; rock mechanics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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