Underwater wellhead head annulus seal surface test device capable of simultaneously loading and pressurizing

Abstract

The invention relates to an underwater wellhead annular sealing ground testing device capable of loading and pressurizing at the same time. The device comprises a simulated high pressure wellhead, a simulation casing hanger, a metal sealing assembly, a stop block, a sealing pressing cover, a piston body and an upper pressing cover. The lower part of the sealing pressing cover and the center hole side wall of the simulation casing hanger are in sealing cooperation, and the upper part and the inner wall of the simulated high pressure wellhead are in sealing cooperation. The piston body and the bottom opening side wall of the upper pressing cover are in sealing cooperation to form a sealing cavity. The outer wall of the simulated high pressure wellhead is provided with a pressurizing pressure injection channel and a pressurizing sensor channel which communicate with a cavity where the metal sealing assembly is located. The top surface of the upper pressing cover is provided with a loading pressure injection channel and a loading sensor channel which communicate with the sealing cavity. According to the device, the simultaneous loading and pressurizing can be realized, the annular sealing installation and testing process can be accurately and efficiently simulated, the loading size of a pressurizing unit can be accurately controlled, sealing incentive ballast can be accurately obtained, the structure is simple, and the assembly is convenient.

Description

technical field [0001] The invention belongs to the technical field of offshore oil production equipment, and in particular relates to a ground test device for annulus sealing of an underwater wellhead head which can be simultaneously loaded and pressurized. Background technique [0002] In view of the high risk of offshore oil and gas production, sealing performance has become the core index of underwater oil and gas equipment. In the current underwater oil and gas production process, the underwater wellhead annulus mainly adopts a metal seal assembly, and the metal seal assembly is composed of a metal seal ring, a seal drive ring and a shear pin (the shear pin connects the metal seal ring with the seal drive ring Together), this type of seal is a self-tightening seal, and the seal must be activated during installation to exert the self-tightening effect during normal operation, that is, the principle of this type of seal is to squeeze the sealing drive ring into the metal ...

AI Technical Summary

Problems solved by technology

[0003] However, the current underwater wellhead annular sealing surface test device cannot realize the sealing excitation method of simultaneous loading and pressurization - the direct loading method is currently used, that is, directly through the large press (the ballast and working space of the small press cannot meet the requirements) Requirements) to press the sealing driving ring to the maximum displacement, this method has many disadvantages: 1. High requirements for testing equipment and high testing cost; 3. This method cannot accurately simulate the correct sealing installation method, which loses the meaning of testing

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