摘要
逆土酸系指氢氟酸浓度和用量高于盐酸浓度和用量的土酸，它处理地层的机理与土酸相同。在大港油田的逆土酸酸液中加入一种可以抑制氧化物沉淀或絮结成胶状物的“溶蚀剂”，避免了地层酸化后新的堵塞。用高浓度大剂量的氢氟酸对泥质堵塞为主的地层解堵和在改造以粘土胶结为主的泥质砂岩地层或钻井液堵塞中的碳酸岩成分较少时，大大增强了酸液对泥质堵塞物的溶蚀能力，所以逆土酸对地层渗透性的改善程度就优于常规土酸。
The reversed mud acid is the mud acid whose concentration and volume of hydrofluoric acid is higher than that of hydrochloric acid, its treatment mechanism is identical to the mud acid. A kind of dissolution agent that can prevent fluoride from depositing or flocculating into cement was added into the acidic fluid of reversed mud acid in Dagang oilfield to avoid new plugging after acidizing the formation. The capacity which acidic fluid dissolute shale plugging was increased greatly when the formation plugging mainly made up of shale is removed by using hydrofluoric acid with high concentration and content, the shaly sand formation which mainly consist of clay cementation is improved or there is less carbon ate ingredient in mud plugging. So the reversed mud acid can improve formation permeability better than the conventional mud acid.
出处
《石油钻采工艺》
CAS
CSCD
北大核心
1998年第1期81-84,共4页
Oil Drilling & Production Technology
关键词
逆土酸
增注技术
注水井
油田
油层注水
high concentration hydrofluoric acid mud acid solvent acidizing formation plug removal
