超深强底水断溶体油藏精细注水技术优化

Optimization of fine water injection technology for ultra-deep and strong bottom water fractured karst reservoirs

S72-S72-2为塔河油田超深强底水断溶体碳酸盐岩油藏,注水开发暴露出原油采出程度低和水驱控制程度低两个突出问题。为解决S72~S72-2区块注水开发过程中暴露出的突出问题,在静态精细识别区块岩溶单元类型基础上,动态识别储集体连通性,进而复核储量和剩余分布特征,井周剩余油类型为内幕断裂型及裂缝蹿进封挡型,而井间为未动用型与高渗通道附近缝洞型;针对剩余油分布特征,建立了3种注水开发调整政策:重构注采井网,重建沟通和优化注采参数,政策矿场应用增产增注效果明显。

S72-S72-2 is an ultra-deep and strong bottom water fault carbonate oil reservoir in Tahe Oilfield.The wa⁃terflood development exposes two prominent problems:low crude oil recovery degree and low water-flooding con⁃trol degree.In order to solve the outstanding problems exposed in the process of water injection development in the S72~S72-2 blocks,on the basis of static fine identification of karst unit types,the connectivity of the reservoir was dynamically identified,and then the reserve and residual distribution characteristics were reviewed.The type of remaining oil around the well was inside fracture type and the type of fracture jumping into the seal type,while the type between the well was unused type and the type near the hyper-permeability channel.According to the distribu⁃tion characteristics of remaining oil,three kinds of water injection development adjustment policies were estab⁃lished:reconstructing the injection-production well pattern,reconstructing communication and optimizing injec⁃tion-production parameters,and the effect of increasing production and injection injection in the application of poli⁃cy mines was obvious.