摘要：The propagation of multiple fractures plays a significant role in the effectiveness of hydraulic stimulation in shale oil reservoirs. Previous studies reported that the laminations and bedding interface in shale oil rocks could influence the propagation of single hydraulic fracture. However, the propagation mechanism of multiple fractures in such rocks is still unclear. Here we use a true-triaxial experimental system, together with the acoustic emission (AE) monitoring system, to investigate the propagation of multiple fractures in shale oil reservoir rocks. The results show that the fracture interference started at the initiation stage seriously affects the propagation of multiple fractures. More clusters per stage could aggravate the fracture interference near the wellhead. The laminations and bedding interfaces are the main causes of fracture interference and could hinder the height of hydraulic fractures. Shear-type AE event signals the generation of fracture interference caused by the slip of bedding interface and the deflection of fractures induced by the laminations. The mechanism of fracture interference not only lies in stress shadow but also in the changes in fluid pressure caused by the high permeability of laminations and bedding interface. The experimental results provide basic and detailed data for studying hydraulic fracturing in shale oil reservoirs.

关键字：Multi-cluster fracturing; Multi-fracture propagation; Shear-type AE; Stress shadow; Layered shale

ISSN号：0723-2632

卷、期、页：卷: 55期: 10页: 6015-6032

发表日期：2022-10-01

影响因子：6.729700

期刊分区（SCI为中科院分区）：二区

收录情况：SCIE（科学引文索引网络版）,地学领域高质量科技期刊分级目录（国外T1）,EI（工程索引）

发表期刊名称：ROCK MECHANICS AND ROCK ENGINEERING

参与作者：张啸寰,Gao, Ke

通讯作者：张啸寰

第一作者：王小琼,葛洪魁,邹雨时

论文类型：期刊论文

论文概要：张啸寰,Gao, Ke,王小琼,葛洪魁,邹雨时,张啸寰，Investigating the Propagation of Multiple Hydraulic Fractures in Shale Oil Rocks Using Acoustic Emission，ROCK MECHANICS AND ROCK ENGINEERING，2022，卷: 55期: 10页: 6015-6032

论文题目：Investigating the Propagation of Multiple Hydraulic Fractures in Shale Oil Rocks Using Acoustic Emission