Factors affecting reorientation of hydraulically induced fracture during fracturing with oriented perforations in shale gas reservoirs
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https://orcid.org/0000-0001-7373-4046
Liang Zhou
Well Testing Branch, CNPC Bohai Drilling Engineering Company Limited, Langfang, Hebei 065007, China.
Zhi-Min Li
No.3 Drilling Engineering Company, CNPC Bohai Drilling Engineering Company Limited, Tianjin 300280, China.
Zhen-Hua Liu
Oil Production Plant No.2, Petrochina Changqing Oilfield Company, Qingcheng, Gansu 745100, China.
Yong Fang
Well Testing Branch, CNPC Bohai Drilling Engineering Company Limited, Langfang, Hebei 065007, China.
Lei Zhao
No.4 Drilling Engineering Branch Company, CNPC Bohai Drilling Engineering Company Limited, Renqiu, Hebei 062550, China.
Ying Han
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China.
Abstract
Hydraulic fracturing with oriented perforations is an effective technology for reservoir stimulation for gas development in shale reservoirs. However, fracture reorientation during fracturing operation can affect the fracture conductivity and hinder the effective production of shale gas. In the present work, a numerical simulation model for investigating fracture reorientation during fracturing with oriented perforations was established, and it was verified to be suitable for all investigations in this paper. Based on this, factors (such as injection rate and fluid viscosity) affecting both of initiation and reorientation of the hydraulically induced fractures were investigated. The investigation results show that the fluid viscosity has little effect on initiation pressure of hydraulically induced fracture during fracturing operation, and the initiation pressure is mainly affected by perforation azimuth, injection rate and the stress difference. Moreover, the investigation results also show that perforation azimuth and difference between two horizontal principle stresses are the two most important factors affecting fracture reorientation. Based on the investigation results, the optimization of fracturing design can be achieved by adjusting some controllable factors. However, the regret is that the research object herein is a single fracture, and the interaction between fractures during fracturing operation needs to be further explored.
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