High-stability oil casing tight in connection

The invention belongs to the technical field of oil casing pipes, and particularly relates to a tightly-connected high-stability oil casing pipe which is composed of a first-stage casing pipe and a plurality of second-stage casing pipes, a first sealing connector is arranged at one end of the first-stage casing pipe, and a second sealing connector is arranged at the other end of the second-stage casing pipe. A second sealing connector connected and matched with the first sealing connector is arranged at the end, close to the first-stage sleeve, of the second-stage sleeve. The first-stage sleeve comprises an outer pipe and an inner pipe. The telescopic positioning component is arranged on the first-stage casing, after the casing is installed in a drilling well, connection and grasping between the casing and the drilling well can be achieved through the telescopic positioning component, the casing is embedded in the inner wall of the drilling well, the stability of the casing can be greatly improved, and shakin