High temperature submersible electric pump safety valve

Abstract

The invention discloses a high-temperature electric submersible pump safety valve, belongs to the technical field of safety valves and particularly relates to a high-temperature electric submersible pump safety valve capable of effectively achieving seal protection of high-temperature horizontal wells or inclined shaft electric submersible pumps. The high-temperature electric submersible pump safety valve can guarantee valve seal performance and reliable stability at a high temperature. The safety valve comprises a shell, a valve body is arranged inside the shell, and an O-type seal ring is arranged between the shell and the valve body. A valve seat with a flange in the middle is arranged on the lower portion inside the valve body, a seal gasket is arranged between the flange of the valve seat and the valve body, and the outer diameter of the seal gasket is larger than that of the flange of the valve seat. A valve main body is arranged above the valve seat and is in a circular ring shape, a cutting edge is arranged on the lower end face and corresponds to the seal gasket, and the inner side wall of the valve main body makes contact with the outer side wall of the flange of the valve seat. A pressure adjusting ring is arranged at the portion, above the valve main body, inside the valve body, and a spring is arranged between the pressure adjusting ring and the valve main body.

Description

technical field [0001] The invention belongs to the technical field of safety valves, in particular to a high-temperature electric submersible pump safety valve capable of effectively solving the sealing protection of high-temperature horizontal well or inclined well electric submersible pumps. Background technique [0002] The safety valve is an essential and important part of the metal bellows protector of the high temperature electric submersible pump. After the metal bellows protector is connected to the motor, the cavity is sealed by a mechanical seal, and the internal motor oil slowly leaks to the well fluid through the mechanical seal. The motor oil expands or contracts with the change of temperature, and the bellows provides corresponding space for the increase or decrease of the volume. The shrinkage or stretching of the bellows is a very slow process, but the amount of oil injected and the temperature cannot be completely in line with the design state, especially ...

AI Technical Summary

Problems solved by technology

The shrinkage or stretching of the bellows is a very slow process, but the amount of oil injected and the temperature cannot be completely in line with the design state, especially when the temperature rises quickly, due to the influence of the high viscosity of the motor oil and the flow damping, the corrugation The response speed of the pipe cannot keep up with the expansion speed of the motor oil, so the pressure in the cavity rises sharply instantaneously. When the compressive strength of the bellows or the unit casing is exceeded, the unit will be damaged. Therefore, it is necessary to install a safety valve. absolutely necessary

[0003] Usually, most of the existing safety valves are needle valves, which have poor stability and poor repeatability when the spring pressing force is small, and the needle valve structure cannot guarantee reliable sealing of high-temperature motors

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