Numerical simulation of fracture propagation in Russia carbonate reservoirs during refracturing  

作　　者：Dao-Bing Wang Fu-Jian Zhou Yi-Peng Li Bo Yu Dmitriy Martyushev Xiong-Fei Liu Meng Wang Chun-Ming He Dong-Xu Han Dong-Liang Sun 

机构地区：[1]School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing,102617,China [2]Unconventional Oil and Gas Science and Technology Research Institute,China University of Petroleum-Beijing,Beijing,102249,China [3]Tuha Downhole Service Company of Xibu Drilling Engineering Company Limited,China National Petroleum Corporation(CNPC),Hami,839009,Xinjiang,China [4]Department of Oil and Gas Technologies,Perm National Research Polytechnic University,Perm,614990,Russia [5]Fracture&Acidizing Technical Center,Research Institute of Petroleum Exploration and Development,Petro China,Beijing,100083,China

出　　处：《Petroleum Science》2022年第6期2781-2795,共15页石油科学（英文版）

基　　金：supported by Beijing Natural Science Foundation(Grant No.3222030);CNPC Innovation Found(Grant No.2021DQ02-0201);the National Natural Science Foundation of China(Grant Nos.51936001 and 52174045);the Award Cultivation Foundation from Beijing Institute of Petrochemical Technology(Project No.BIPTACF-002)

摘　　要：Refracturing treatment is often performed on Russian carbonate reservoirs because of the quick production decline of reservoirs.The traditional refracturing model assumes that a refracture initiates in the normal direction relative to the initial hydro-fracture.This assumption is inconsistent with oilfield measurements of refracture propagation trajectories.Indeed,the existing model is not based on an indepth understanding of initiation and propagation mechanisms of the second hydraulic fractures during refracturing.In this study,we use the extended finite element method to investigate refracture propagation paths at different initiation angles.Both the enriched function approach and phantom mode technique are incorporated into the refracturing model,thereby ensuring that the refracture can freely extend on the structured mesh without any refinement near the crack tips.Key factors including production time,stress anisotropy and initiation angle,and the propped mechanical effect are analyzed in detail.This study provides new insight into the mechanism of refracture propagation in unconventional reservoirs.

关 键 词：REFRACTURING Stress reorientation Extended finite element method Carbonate reservoir Fracture diversion 

分 类 号：TE357[石油与天然气工程—油气田开发工程]