页岩气水平井重复压裂关键技术进展及启示

Key Technology Progress and Enlightenment in Refracturing of Shale Gas Horizontal Wells

由于页岩气水平井初始增产措施的种种不利因素,产量达不到预期,加之目前低迷的油价背景,页岩气水平井重复压裂技术越来越受到页岩气资源开发的关注。随着压裂技术的不断发展,许多页岩气区块已经成功实施了这一技术,以提高生产率,并增加页岩气井的最终采收率。综述了页岩气水平井重复压裂优化选井的程序,并讨论了关键工艺技术和监测分析技术,最后,结合目前不同技术的研究现状,对今后页岩气水平井重复压裂技术的研究方向进行了展望,提出了结合“大数据”技术选井、套损变形井柔性修复、基于损伤力学的裂缝监测以及新型材料的压裂液和支撑剂等技术攻关的建议。中国页岩气资源潜力巨大,加速形成适合中国页岩气水平井重复压裂配套技术,会对未来中国页岩气商业开发起到促进作用。

Due to the unfavorable factors of initial stimulation treatment in shale gas horizontal wells,the output is less than expected,coupled with the current downturn in the oil price background,shale gas horizontal wells refracturing technology is increasingly concerned about the development of shale gas resources.With the continuous development of fracturing technology,many shale gas fields have now successfully implemented this technique to increase production rate and to enhance ultimate gas recovery from shale gas wells.Overviewed the procedure for candidate well identification and discussed the key fracturing techniques and operation monitoring techniques.Lastly,based on the current situation of the development of different techniques,the direction of the refracturing technique of shale gas horizontal wells were prospected.Some suggestions were put forward,such as selecting wells with“big data”technology,flexible restoration of casing damaged and deformed wells,fracture monitoring based on damage mechanics,and fracturing fluid and proppant with new materials.As China is abundant in potential shale gas reserve,to accelerate the formation of supporting technology suitable for shale gas horizontal wells refracturing in China can play a role in promoting the commercial development of shale gas in China in the future.