基于光纤监测的段内多簇压裂效果主控因素研究

Investigation into the controlling factors of the in-stage multi-clusterfracturing effects based on optical fiber monitoring

水平井分段多簇压裂是非常规油气效益开发的必备技术之一,明确段内多簇裂缝起裂规律与流体分流主控因素对优化分段分簇方案至关重要。本文针对一口典型分段多簇压裂水平井,首先获取各射孔簇处测井原始数据和测井解释数据,接着基于分布式光纤监测技术,反演段内段内各裂缝起裂顺序、进液比例和产液比例等数据,将测井数据与光纤监测数据进行对比分析,确定影响段内多簇压裂效果的主控因素。结果表明:低水平最小主应力、高脆性指数的射孔簇优先开启;影响前置液比例的测试数据中最关键4个因素分别是:气测数据>中子数据>伽玛数据>声波数据;影响携砂液比例的测试数据中最关键4个因素分别是:气测数据>中子数据>伽玛数据>声波数据;影响产液比例的关键因素是总液分配比和φ×S_(o)。本文研究成果对制定水平井分段分簇压裂方案具有一定的指导意义。

Horizontal well multi-stage fracturing is one of the necessary technologies for unconventional oil and gas develop-ment.Clarifying multi-cluster fracture propagation and the main control factors of the fluid shunt are crucial to optimizing the stages and cluster design.In this paper,firstly,the original logging data and logging interpretation data at each perforation cluster are obtained.Then,based on distributed optical fiber monitoring technology,the data of the fracturing sequence,liquid inlet ratio,and liquid production ratio of each fracture in the stage are calculated.The well logs and optical fiber monitoring data are compared and analyzed to determine the main controlling factors affecting the multi-cluster fracturing effect in the stage.The results show that the perforated clusters with low minimum principal stress and high brittleness index are opened first.The four most critical factors affecting the proportion of pre-liquid and the sand liquid are:QL>Neutron>Gamma Ray>Acoustic;The key factors affecting the proportion of liquid produced are the total liquid dispensing ratio and theφ×S_(o).The research results of this paper have significance for guiding formulation of a fracturing scheme for horizontal wells.