分布式光纤压裂监测技术研究及应用

Study and application of distributed fiber optic fracturing monitoring technology

随着页岩油气等非常规油气勘探开发走向深层以及日趋精细化,微地震等传统压裂监测手段愈发无法满足压裂效果评价的精度要求。作为分布式光纤传感(DFOS)技术的最新研究进展,分布式光纤声波传感(DAS)近年来成为国内外压裂监测方向的研究热点。文中介绍了井下光缆布设、光缆深度标定、DAS信号处理、压裂期间DAS响应提取和解释的方法,并结合涪陵地区某页岩气井组的套管外光纤压裂监测实例,展示了DAS技术给非常规油气水力压裂监测带来的新视角和新认识,为我国压裂监测新技术的发展和推广应用提供参考。

With the deepening and gradual refinement of unconventional oil and gas exploration and development such as shale oil and gas etc.,traditional fracturing monitoring methods such as microseismic monitoring are increasingly unable to meet the accuracy requirements of fracturing effect evaluation.In recent years,as the latest research progress of distributed fiber optic sensing(DFOS),distributed acoustic sensing(DAS)has become a research hotspot of fracture monitoring at home and abroad.This paper introduces the methods of downhole optical cable deployment,optical cable depth calibration,DAS signal processing and DAS response extraction and interpretation during fracturing,and then demonstrates the new prospective and understanding brought by DAS technology to unconventional oil and gas hydraulic fracturing monitoring combined with an example of out-of-casing fiber optic fracturing monitoring of a shale gas well group in Fuling area,providing reference for the development and application of new fracturing monitoring technology in China.