Seawater Intrusion Risk and Prevention Technology of Coastal and Large-Span Underground Oil Storage Cavern

The presence of a high concentration Cl− in saltwater will erode the structure and facilities, reducing stability service life underground oil storage cavern. In order to reduce risk seawater intrusion, this paper studies prevention technology intrusion based on case study coastal large-span A refined three-dimensional hydrogeological model that comprehensively considers permeability coefficient partitions, faults, fractured zones are constructed. seepage fields risks reservoir site its natural state, during construction, operation examined, respectively. quantifies water inflow optimizes technology. results indicate there is no incursion into cavern under conditions. inflows after excavating top, middle, bottom sections main predicted be 6797 m3/day, 6895 6767 During excavation period, supply from curtain system lower than cavern, providing maximum injection 6039 m3/day. level area decreased obviously but flow direction sea. Additionally, less 7 mol/m3; hereby, risks. When only horizontal deployed, occurs 18 years operation. southeast group exceeds 50 mol/m3 years, reaching moderate corrosion serious intrusion. addition above vertical could added side, with borehole spacing 10 m extending 30 below group. This scheme can effectively extend findings research applied as guidelines for caverns areas tackle problems.