国外页岩气井人工举升增产技术研究现状与进展

Research status and progress of artificial lifting of shale gas wells abroad

压裂后产量快速降低是页岩气井生产的典型特征,不施加干预措施很难实现经济开发。为页岩气井优选合理的人工举升工艺,排出井筒积液,稳定页岩气井产量,提高单井可采储量,是页岩气藏高效开发的核心工作之一。调研了常规人工举升工艺在北美页岩气产区的应用情况,分析了各项技术应用的限制因素和存在的不足;针对页岩气井寿命周期内的压裂液返排、处理段塞流、前期及后期生产特征,总结出了页岩气井不同生产阶段人工举升工艺的优选方案,并阐述了应考虑的影响因素和注意事项;最后,介绍了两种页岩气井增压增产新技术的工艺原理和应用效果。该研究可以为国内页岩气田的经济高效开发提供借鉴。

Rapid production decline after fracturing is a prominent characteristic of shale gas wells and it is hard to deliver beneficial recovery without appropriate intervention.One of the critical tasks of high-efficiency recovery of shale gas is to optimize the artificial lifting of shale gas wells so as to drain wellbore liquid loading,stabilize gas production,and increase recoverable reserves per well.It analyzed the application performance of various artificial lifting techniques in North America and pointed out the constraints of applications and present technical disadvantages.With the fracturing fluid flowback,slug flows,early and late wellbore conditions of production wells and production characteristics through the lifecycle of shale gas wells taken into consideration,the optimization plan of artificial lifting was developed and the factors,to which extra attention shall be paid,during the optimization process were clarified.Finally,two novel technical mechanisms to boost shale gas production via pressurization and their application performance were introduced.This research provides references for the high-efficiency cost-effective development of shale gas in China.