Sealing device for high-temperature-resistant ultrahigh-pressure test pitshaft

A sealing device for a high-temperature-resistant ultrahigh-pressure test pitshaft comprises a protruded should cover, a test tool connector installed on the protruded should cover, a pressing cover, a pitshaft, test sleeves and suspending flanges for fixing the test sleeves. The sealing device further comprises a tensioning device and a sealing device. The protruded should cover is connected with the pitshaft through the tensioning device and the pressing cover, and the sealing device is installed on the matched surface of the protruded should cover and is connected with the pitshaft through the tensioning device. High-temperature high-pressure working performance testing and test sealing through various downhole tools are achieved through interchange of the sealing device. Not only can the sealing under high-temperature high-pressure conditions be achieved, but also previous tests of multiple pitshafts can be replaced to be finished in one pitshaft, and the cost is reduced. Particularly in the process of adding the test sleeves to perform tests, due to the fact that tools for tests each time are not single, the downhole tools can be easily replaced through the sealing device, all the sleeves do not need to be taken down, the time for replacing different tools to perform tests is shortened, and the sealing device saves time and labor.