Influence of natural fracture zones on the propagation of hydraulic fractures in deep shale

被引：0
|
作者：
Yi L. [1 ]
Yang C. [1 ]
Yang Z. [1 ]
Song Y. [2 ]
He X. [3 ]
Zhou X. [2 ]
Li X. [1 ]
Hu J. [2 ]
机构：
[1] State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan, Chengdu
[2] Shale Gas Research Institute, PetroChina Southwest Oil & Gasfield Company, Sichuan, Chengdu
[3] Development Department, PetroChina Southwest Oil & Gasfield Company, Sichuan, Chengdu
来源：
Natural Gas Industry | 2022年 / 42卷 / 10期
关键词：
Deep shale; Fracture propagation; Natural fracture zone; Numerical simulation; Parameter optimization; Sichuan Basin;
D O I：
10.3787/j.issn.1000-0976.2022.10.008
中图分类号：
学科分类号：
摘要：
There are abundant shale gas resources in the Sichuan Basin, and deep shale gas will be the important field of shale gas production in China in the future. The volumetric fracturing technology is one of the core technologies for the efficient development of deep shale gas. In order to clarify the influence of natural gas zones on the propagation of hydraulic fractures in deep shale, this paper establishes a fluid-solid coupled model for the propagation of hydraulic fractures in horizontal wells by means of displacement discontinuity method and finite volume method, and then proposes a method for evaluating the propagation characteristics of hydraulic fractures. In addition, the influence of natural fractures and completion fracturing parameters on the propagation of hydraulic fractures in the stage of fracture initiation by prepad fluid during horizontal well fracturing is analyzed. And the following research results are obtained. First, the natural fracture zones in deep shale increase the difficulty of fracturing stimulation and the complexity of fracture propagation. As a result, the adjacent fracturing sections are influenced by the hydraulic fractures, and the zones far from the well can be hardly stimulated. Second, the narrower the natural fracture zone and the greater the included angle and distance between natural fracture zone and horizontal wellbore, the higher the stimulation rate of target area and the less the influence on the adjacent hydraulic section. Therefore, it is necessary to avoid small angle intersection between drilling direction and natural fracture zone as much as possible during drilling. Third, large cluster spacing and high injection rate can weaken the capture and barrier effect of natural fracture zones on hydraulic fractures, so it is suggested to apply the fracturing process with large cluster spacing and high injection rate in the fracturing sections near the natural fracture zones. In conclusion, the research results are beneficial to optimize the design of shale fracturing in complex structural zones, greatly significant to guide the optimization and improvement of fracturing process in deep zones with complex fractures, and conducive to the large-scale benefit development of deep shale gas in China as soon as possible. © 2022 Natural Gas Industry Journal Agency. All rights reserved.
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页码：84 / 97
页数：13
相关论文
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