Rotary docking device under pressure

Abstract

The invention discloses a rotary docking device under pressure. The rotary docking device under pressure comprises a middle connection main body, a lower connection flange and an upper connection flange, wherein the lower connection flange is connected with a lower end of the middle connection main body; the upper connection flange is connected with an upper end of the middle connection main body;a middle connection cavity is formed in the middle connection main body; a cylinder block is arranged on an outer side of a lower end of the middle connection main body; a piston cavity is formed between the cylinder block and the middle connection main body; an oil cylinder blocking ring is arranged at a lower end of the cylinder block; a middle part of the lower connection flange is arranged between the oil cylinder blocking ring and the middle connection main body in a sliding way; a piston which is in sliding fit with the piston cavity is arranged at the upper end, extending into the piston cavity, of the lower connection flange; diving threaded holes are formed in a lower end of the lower connection flange; and a first pressure pipeline connection port which is in communication withthe piston cavity at the lower end of the piston is formed in the lower end of the cylinder block.

Description

Technical field [0001] The invention relates to a well control equipment, in particular to a pressurized rotary docking device. Background technique [0002] The docking device is one of the main components of the wellhead working device under pressure. It is mainly used to connect up and down under pressure during the workover process to ensure the normal safety of equipment such as the connection and assembly of the pipeline before the operation and the convenience of the pipe string during operation. However, the existing docking device has a simple structure and cannot be pressurized at the same time (refers to that the docking device can work normally with a rated working pressure, and the main body of the intermediate connection must have the function of bearing and pressure, and be connected vertically. High sealing performance requirements), liftable (that is, hydraulic control of axial movement to adjust the required connection height), rotatable (that is, hydraulic cont...

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Problems solved by technology

However, the existing docking device has a simple structure and cannot realize pressure at the same time (referring to the docking device can work normally under the condition of rated working pressure, the intermediate connecting body must have the function of bearing and pressure, and the vertical connection between the upper and lower High sealing performance requirements), liftable (that is, hydraulic control of axial movement to adjust the required connection height), rotatable (that is, hydraulic control of circumferential movement to adjust the angle required for rotation), and leveling (that is, hydraulic control to adjust pressure balance , the docking device is the only channel to adjust the pressure balance in the working device under pressure. The upper part is in balance with the blowout preventer. The blowout preventer is adjusted to be balanced. Only when the pressure in the docking device is balanced with the lower pressure can the lower gate be opened to pass through the coupling; the upper and lower blowout preventer gates must not be opened at the same time, and the gate must not be opened when the pressure is unbalanced. plate), unloading (referring to the sudden rise of the pressure in the well during operation, under normal circumstances, all operating blowout preventers are closed to prevent blowout and the operation is carried out, but when the pressure exceeds a certain value, the unloading valve must be opened to release Pressure unloading to ensure the safety of personnel and equipment while avoiding environmental pollution) and safety and environmental protection and other diversified needs, the emergency control cannot be adjusted on the docking flange, which is inconvenient to use

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