Research On Injection And Production String Of Su 1 Gas Storage Reservoir

Su 1 Gas Storage,one of Huabei Oilfield Suqiao gas storages,is characterized as the high temperature and high pressuregas storages with deep wells.The requirement of production pipe after injection is high,and none of the similar gas storage can be used for references all over the world.So the study of gas storage deep well under high temperature and pressure is significant to ensure safe operation and seasonal emergency regulation of Su 1 Gas Storage.Injection nodal analysis method was applied in this study to optimize the model of fluid movement under different well types and production conditions.The following analysis were also conducted,including gas amount of injection and recovery,erosion,and fluid-carrying capacity.The production method of injection well and proper size were established.Based on the operation mode of the gas storage,the force of injection well was analyzed under free,sealed,gas injection,and gas recovery conditions,and other likely extreme conditions.The injection-recovery well was also analyzed for safety assessment.Grade 110 steel pipe can be used for the horizontal well,and Grade 80 steel pipe can be used for old well.Combining the mechanical and safety assessment results and reasonable design of injection-recovery well,permanent packer isolation well should be used for horizontal well and recovery packer isolation well should be used for old well.At the same time,downhole tools suitable for high temperature and high pressuregas storages with deep wells are selected and gas storage injection production string design is finished.Finally,from the perspective of security and integrity of gas storage construction,reasonable injection and production string structure is designed to to ensure gas storage long-term,safe and stable operation.