连续油管光纤测井技术及其在页岩气井中的应用

水平井复合桥塞分段压裂是国内页岩气井的主要开发方式，由于页岩气井快优钻井造成的井眼轨迹及井深结构的特殊性、钻塞结束后井筒内残留部分桥塞碎屑、水平段多相流的复杂性等，常规产出剖面测井技术难以满足页岩气井的测试要求。针对页岩气井数量众多，钻塞后井筒金属碎屑较多的特性，测井前利用强磁打捞器进行打捞兼通井以提高施工成功率，采用连续油管内穿光纤并下挂流体扫描成像测井仪FSI 的工艺进行产气剖面测井，能得到较真实的产气产液剖面、各射孔簇产气产液贡献，可以有效评价各级压裂效果。连续油管光纤测井方法在页岩气井中的应用前景良好。

Well logging via coiled tubing fiber optic infrastructures and its application in shale gas wells

Staged fracturing of horizontal wells by composite bridge plug is the main development mode of domestic shale gas wells. Due to the particularity of wellbore trajectory and well depth configuration caused by optimized fast drilling of shale gas wells, some plug debris still remaining in the wellbore after the plug is drilled out and the complexity of multiphase-flow in horizontal section, the well logging technology for conventional producing profile cannot meet the requirement of shale gas wells. In view of large numbers of shale gas wells, it is urgent to evaluate the drilled and completed wells and fracturing effectiveness in order to guide further fracturing. Gas producing profile logging was carried by FSI (fluid scanning imaging logging instrument) technique, in which optical fiber goes through the coiled tubing with fluid scanning imaging tool hanging below. This technique can obtain real gas and fluid producing profiles and gas and fluid production of all perforation clusters and effectively evaluated the effectiveness of all staged fracturing. In line with the characteristics that production logging is mostly carried out after drilling out the bridge plug in shale gas wells and there is a lot of metal debris in wellbore, so strong magnet was used to remove the debris and drift the well prior to logging, which could improve logging success rate. This method of fiber-optic well logging through coiled tubing has a good prospect of application in shale gas wells.