苏里格气田“十三五”期间提高采收率技术思路

Technical ideas of recovery enhancement in the Sulige Gasfield during the 13^(th) FiveYear Plan

鄂尔多斯盆地苏里格气田的勘探与开发成果推动我国致密砂岩气产量实现了质的飞跃,如何提高采收率乃是其最核心的研究主题。为此,回顾了该气田的开发历程,着重阐述了提高单井产量技术进展,探讨了转变传统开发方式和提高采收率的技术思路与对策。研究结果表明:特大型致密砂岩气藏的评价、上产、稳产所需要的开发技术是呈'渐进式变化'的;基于甜点区筛选的井位部署技术、水平井开发技术、井型井网优化技术、快速钻井技术、储层改造技术和排水采气新工艺、'一体化'建设模式等支撑了该气田的快速上产。在此基础上,提出了'十三五'期间提高采收率的技术思路:①基于单井全生命周期分析的气田开发规划评价技术;②以提高采收率为目标的混合井网动态评价及加密技术;③集群化多井型多层系面积井网新区一次成型提高采收率技术;④基于风险和效益评价的储量评价模型;⑤'多维矩阵'式气井精细管理技术;⑥低产低效井挖潜技术;⑦新型井场环保技术;⑧基于一体化集成装置的地面工艺;⑨C_3^+混合烃类回收利用技术。以期为该区'十三五'期间致密砂岩气藏的开发提供更可靠的技术支撑。

Based on the exploration and development achievements of the Sulige Gasfield in the Ordos Basin, tight sandstone gas yield has been increased essentially in China. Recovery enhancement is always the core subject in researches. In this paper, the development history of the Sulige Gasfield was reviewed focusing on the technological progress in single well production enhancement. Then, the tech- nical ideas on and countermeasures for transforming the traditional development modes and increasing recovery factor were discussed. It is shown that the development technologies in the evaluation and the production enhancement and stabilization of giant tight sandstone gas reservoirs are changed progressively. The fast increase of gas production in this field is made possible by well location arrangement technology based on sweep spot screening, horizontal well development technology, well type and well pattern optimization technolo- gy, fast drilling technology, reservoir stimulation technology, drainage gas recovery technology and integrated construction mode. And finally, the technical ideas of recovery enhancement during the 13th Five-Year Plan were proposed in nine aspects, including gas field de- velopment, planning and evaluation technology based on single-well life cycle analysis; dynamic evaluation and infilling technology for mixed well patterns targeting recovery enhancement; one-shot recovery enhancement technology for a new areal pattern area with inte- grated multiple well patterns and multiple series of strata; reserve evaluation model based on risk and benefit evaluation; gas-well precise management technology with multi-dimensional matrix; potential tapping technology for low production and low efficiency wells; novel wellsite environmental protection technology; surface process based on integrated equipments; and C3^＋ mixed hydrocarbon recovery tech- nology. It provides technically reliable support for the development of tight sandstone gas reservoirs in Sulige Gasfield during the 13^th Five-Year Plan.