中国石油大学学报（自然科学版）2017，Vol.41Issue(1)：102-109,8.DOI:10.3969/j.issn.1673-5005.2017.01.013
水平井多段分簇压裂裂缝扩展形态数值模拟
Numerical simulation study on fracture extension and morphology of multi-cluster staged fracturing for horizontal wells
摘要
Abstract
Multi-cluster staged fracturing of horizontal wells is a key technology to enhance oil recovery of low permeability reservoirs,by which the oil drainage area can be increased obviously to improve ultimate oil recovery.In the fracturing process,the stress interference among different clusters can affect the propagation of the fractures and is the key factor affecting the process.In order to increase the stimulated reservoir volume and study the extension of fractures between clusters,a two-dimension simulation model was established,in which an ABAQUS extended finite element method was used based on fluid-solid coupling equations and rock fracture mechanics.The method was applied in two horizontal wells for fracturing optimization,and their results were compared with the adjacent wells with no optimization.The results show that the fracture length,the distance between clusters and the difference of principal stresses can have a great influence on the fracture morphology.As the fracture length increases,the influence of the induced stress field on fracture morphology can be gradually strengthen.The cluster space and the rise of the horizontal stress difference rise can weaken the induced stress field.The sequence of the cluster fracturing can change the distribution of the induced stress field evidently.The fracture length can be extended further via optimizing the fracturing sequence.The two optimized wells had higher yield than the adjacent wells,which prove the effectiveness and feasibility of the model for field application.关键词
水平井/多段分簇压裂/岩石断裂力学/流-固耦合/扩展有限元方法/缝间干扰/裂缝形态Key words
horizontal well/multi-cluster staged fracturing/rock fracture mechanics/fluid-solid coupling/extended finite element method/fracture interference/fracture morphology分类
能源科技引用本文复制引用
曲占庆,田雨,李建雄,郭天魁,李小龙,刘晓强..水平井多段分簇压裂裂缝扩展形态数值模拟[J].中国石油大学学报（自然科学版）,2017,41(1):102-109,8.基金项目
国家自然科学青年基金项目(51404288) （51404288）
中央高校基本科研业务费专项(15CX06029) （15CX06029）
中国石油大学(华东)科研启动基金项目(Y1302055) （华东）
中国石油大学(华东)研究生创新工程项目(YCXJ2016024) （华东）
