页岩水平井“多段分簇”压裂支撑剂分流与展布机理研究

Multi-stage hydraulic fracturing with multi-cluster perforations and large volume of fracture fluid of horizontal well is the key technology to develop shale gas. During the fracturing process, fracturing fluid and proppant might be divided heterogeneously in the horizontal well bore and complex fracture, due to the impact of perforated clusters and branches of complex fracture. And this will directly affect the volume and distribution of proppant in the fracture of different perforation cluster and major and minor fractures of one perforation cluster, then lead to the fracture conductivity and validity of the opened fractures. In this project, the force condition, division, distribution and corresponding influencing factors of the proppant in the horizontal well bore and complex fracture would be detailed studied by carrying out series of laboratory experiments, numerical simulation and theoretical analysis. We attempt to figure out the mechanism of the proppant division and distribution and build a corresponding multivariate theoretical prediction model. Then, problems encountered in hydraulic operation, such as “Where is the proppant?” and “Is the fracture propped effectively?”, can be answered properly. The above studies will provide concrete advises to hydraulic fracture design and hydraulic operation in shale gas reservoir, and also reference to production estimation after hydraulic.

超大规模水平井“多段分簇”压裂是页岩气开发的关键技术，由于射孔簇和复杂裂缝分支的影响，压裂液和支撑剂在水平井筒和复杂裂缝中存在分流现象，将直接影响不同射孔簇和单簇主次裂缝中的支撑剂量和展布形态，以及裂缝的导流能力和有效性。本项目以水平井筒和复杂裂缝中的支撑剂作为研究对象，基于室内实验、数值模拟和理论分析，研究支撑剂的受力、分流和展布规律及其影响因素，明确支撑剂的分流与展布机理，并构建相应的多因素理论预测模型，以期解决压裂过程中“支撑剂去哪儿？”及压后“裂缝支撑效果怎么样？”的问题。以上研究可为页岩压裂设计、现场压裂施工方案提供具体建议，也可为页岩气的压后产能评估提供参考。

超大规模水平井“多段分簇”压裂是页岩气开发的关键技术，由于射孔簇和复杂裂缝分支的影响，压裂液和支撑剂在水平井筒和复杂裂缝中存在分流现象，将直接影响不同射孔簇和单簇主次裂缝中的支撑剂量和展布形态，以及裂缝的导流能力和有效性。本项目以水平井筒和复杂裂缝中的支撑剂作为研究对象，基于室内实验、数值模拟和理论分析，研究支撑剂的受力、分流和展布规律及其影响因素，明确支撑剂的分流与展布机理，并构建相应的多因素理论预测模型，以期解决压裂过程中“支撑剂去哪儿？”及压后“裂缝支撑效果怎么样？”的问题。以上研究可为页岩压裂设计、现场压裂施工方案提供具体建议，也可为页岩气的压后产能评估提供参考。