Numerical study of hydraulic fracturing in the sectorial well-factory considering well interference and stress shadowing

作     者：Yu-Hao Liu Jin-Tao Zhang Jie Bai Feng-Shou Zhang Ji-Zhou Tang 

作者机构：Key Laboratory of Geotechnical&Underground Engineering of Ministry of EducationTongji UniversityShanghai200092China Department of Geotechnical EngineeringCollege of Civil EngineeringTongji UniversityShanghai200092China Southwest Oil&Gas Field CompanyPetroChinaChengdu610017SichuanChina Oil and Gas Technology Research InstitutePetroChina Changqing Oilfield CompanyXi’an710021ShaanxiChina National Key Laboratory of Marine GeologyTongji UniversityShanghai200092China School of Ocean and Earth ScienceTongji UniversityShanghai200092China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2023年第20卷第6期

页      面：3567-3581页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 082002[工学-油气田开发工程] 

基　　金：funded by the National Natural Science Foundation of China(42077247,52104029) the Fundamental Research Funds for the Central Universities 

主　　题：Hydraulic fracturing Sectorial well-factory Fracture deflection Well interference Stress shadowing 

摘      要：In the Changqing Oilfield in northwest China, when traditional petroleum exploitation encounters forestry reserves or water source protection areas, sectorial well-factory design is proposed. The most distinct feature of a sectorial well-factory is the deviation of the well from the minimum horizontal principal stress, resulting in hydraulic fracture deflection after the initiation, along with possible well interference (i.e., fracture hit) and fracture coalescence in the oblique wells. Four indexes describing well deflection are then proposed according to fracture morphology. Several fracturing designs, including stage arrangement, fracturing sequences, and fracturing techniques are applied to study the feasibility of the sectorial well-factory design. The results show that the “gradual or “sparse stage arrangement, large injection rate, and simultaneous multifracture treatment can help to optimize the fracture morphology and stimulation design. However, the subsequent stress shadowing effect usually adversely affects the fracturing of adjacent wells. With a small initial horizontal stress difference, large injection rate and staggered stage arrangement can achieve ideal stimulation performance. Our results can provide a guidance for optimizing stimulation design in unconventional well-factory while taking into account environmental protection.