页岩气长水平井重复压裂技术研究及应用

Research and application of refracturing technology for long horizontal wells in shale gas

针对目前暂堵转向重复压裂工艺难以适用于水平段长度大于500 m的页岩气水平井重复压裂的问题,开展了页岩气长水平井重复压裂技术研究。明确了水平段上的剩余可采储量,优化低动用段施工规模为1100~1200 m^(3),主要剩余潜力段施工规模为1600 m^(3),趾端最大施工排量为10 m^(3)/min,跟端最大施工排量为12 m^(3)/min,创新形成了以“井筒重建+段簇间补孔+一体化变黏压裂液”为核心的页岩气长水平井重复压裂关键技术。在FL页岩气田累计完成了2口井现场试验,重压后测试产量分别为18.4万m^(3)/d和17.7万m^(3)/d,采收率分别提高了4.8%和4.2%。

The current temporary plugging and refracturing technology is difficult to apply to the refracting of shale gas horizontal wells with a horizontal section length greater than 500m,to overcome this problem,research on the refracting technology of shale gas long horizontal wells has been carried out,and the remaining horizontal section was clarified.For recoverable reserves,the construction scale of the optimized low-production section is 1100-1200 m^(3),the construction scale of the main remaining potential section is 1600 m^(3),the maximum construction displacement at the toe end is 10 m^(3)/min,and the maximum construction displacement at the heel end is 12 m^(3)/min.The key technology for refracting long horizontal wells in shale gas is based on the rational combination of reconstruction,inter-cluster hole patching and integrated variable-viscosity fracturing fluid.A total of 2 well field tests have been completed in the FL shale gas field,in which the test output is 18.4×10^(4)m^(3)/d and 17.7×10^(4)m^(3)/d,respectively,and the recovery factor is increased by 4.8%and 4.2%,respectively.