重复压裂前诱导应力影响新裂缝转向规律

发布时间：2018-05-02 09:46

本文选题：重复压裂 + 诱导应力　；参考：《断块油气田》2017年04期

【摘要】：随着重复压裂技术现场应用的日趋成熟,如何产生不同于原裂缝走向的转向新裂缝成为目前重复压裂技术研究的热点问题。由于新裂缝的扩展方向主要由井周应力分布情况控制,重复压裂前初次裂缝、油井生产以及注水影响等因素产生的诱导应力是影响新裂缝形态的主要因素。应用多物理场耦合软件COMSOL建立了重复压裂井有限元模型,分析了重复压裂裂缝转向的机理和影响因素;建立了注水开发区块模型,研究了注水开发中注入水诱导应力的分布规律,以及注水量、注采井网分布等因素对新裂缝转向的影响。研究结果表明:裂缝转向受储层应力状态、油井生产情况和初次裂缝长等因素影响明显;注水井周边会产生应力集中,且在一定的井距下会影响新裂缝转向规律。此研究可以应用于预测重复压裂效果,优化重复压裂的选井选层,并指导现场重复压裂方案设计。
[Abstract]:With the increasing maturity of the field application of the repeated fracturing technology, how to produce the new fracture which is different from the original fracture strike has become a hot issue in the research of the refracturing technology at present. Since the propagation direction of new fractures is mainly controlled by the distribution of stress around the well, the induced stress caused by the initial fractures before repeated fracturing, the oil well production and the influence of water injection are the main factors affecting the shape of new fractures. The finite element model of the refracturing well is established by using the multi-physical field coupling software COMSOL, the mechanism and influencing factors of the refracturing fracture turn are analyzed, and the water injection development block model is established. The distribution law of injected water induced stress and the influence of injection quantity and injection-production pattern distribution on the new fracture turn are studied in this paper. The results show that the fracture turn is affected by reservoir stress state, oil well production condition and initial fracture length, and stress concentration is produced around the injection well, and the new fracture turning law is influenced by a certain well spacing. This study can be used to predict the effect of repeated fracturing, optimize the selection of wells and layers for repeated fracturing, and guide the design of field fracturing schemes.
【作者单位】：中国石油大学(华东)石油工程学院;中国石化胜利油田分公司石油工程技术研究院;振华石油控股有限公司;
【基金】：中央高校基本科研业务费专项资金资助项目(17CX02077)
【分类号】：TE357

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