动态负压射孔技术研究与应用

Research and Application of Dynamic Underbalance Perforation Technology

聚能射孔不仅在孔道周围形成压实带,而且在孔道内产生杵体,降低孔道渗流效果,影响油气井的产能。本文对动态负压射孔清洁孔道的机理进行分析,研制了动态负压射孔器。分析影响动态负压参数的主要因素,建立了动态负压值、动态负压产生时间和持续时间的数学控制模型,掌握了井筒环境下动态负压精确控制方法,形成针对不同储层条件下的动态负压值设计方法,研制动态负压射孔井下工具,并开发动态负压射孔工艺技术,缓解了射孔压实带影响,清洁了孔道碎屑,提高了孔道导流能力。在胜利东部油区和西部新区应用了260余井次,提高了油井产能和注入效率。

Shaped charge perforation not only forms a compacted zone around the perforation tunnel but also generates a plug within the tunnel,reducing the flow efficiency and affecting the productivity of oil and gas wells.This paper analyzes the mechanism of dynamic underbalance perforation for cleaning the perforation tunnel and develops a dynamic underbalance perforator.The main factors affecting dynamic underbalance parameters are analyzed,and mathematical control models for dynamic underbalance value,generation time,and duration are established.Methods for precise control of dynamic underbalance under wellbore conditions are mastered,and design methods for dynamic underbalance values tailored to different reservoir conditions are formed.Downhole tools for dynamic underbalance perforation are developed,and dynamic underbalance perforation technology is implemented.This technology relieve the impact of perforation compaction zone,cleans the debris in the perforation tunnel,and improves the flow capacity of the tunnel.It has been applied in over 260 wells in the eastern Shengli Oilfield and the western new areas,enhancing well productivity and injection efficiency.