A constant pressure hydraulic station

Abstract

The invention relates to the field of offshore drilling equipment, and specifically relates to a constant pressure hydraulic station. The constant pressure hydraulic station comprises an oil box (22), an overflow valve (24) and at least one set of pump group, wherein each pump group comprises an electromagnetic valve (13), an electromotor (15) and a constant pressure pump (16); each electromotor (15) is connected with the corresponding constant pressure pump (16), an oil absorbing opening S of each constant pressure pump (16) is connected with the oil box (22), and a drainage opening T of each constant pressure pump (16) is connected with the oil box (22). When the constant pressure hydraulic station comprises two or more pump groups, outlets B of constant pressure pumps (16) of the pump groups are connected in parallel to form a pressure opening (28) of the hydraulic pressure station; each constant pressure pump (16) also comprises a first control opening (X) and a second control opening (Mst). The constant pressure hydraulic station provided by the invention has the advantages that when the hydraulic station starts, the electromotors and the constant pressure pumps can start in a no-load manner and with low pressure, the power is small, the constant pressure hydraulic station without impact starts, and the reliability and service lives of the electromotors and the constant pressure pumps are effectively improved.

Description

technical field [0001] The invention relates to the field of offshore drilling equipment, in particular to a constant pressure hydraulic station. Background technique [0002] With the continuous development of offshore drilling technology, drill pipe handling devices, riser handling devices, and moon pool trolleys are becoming indispensable industrial standards in the design of deepwater drilling platforms. As the power source of various hydraulic equipment such as drill pipe handling device, riser handling device, moon pool trolley, and compensation system, the hydraulic station is widely used in offshore drilling platforms or drilling ships. In deepwater drilling work, the hydraulic station is basically in 24-hour uninterrupted operation. Once there is a problem with the hydraulic station, the drilling operation will be stopped and huge losses will be caused. Therefore, the hydraulic station in deepwater drilling work plays a very important role. [0003] At present, on ...

AI Technical Summary

Problems solved by technology

[0007] The existing problems in the prior art are as follows: First, the hydraulic station in the prior art responds quickly and is not affected by the load, but the rated pressure of each pump is set by its own pressure control valve. Under the same system pressure, the pressure control The setting value of valve 1 403 is slightly deviated, and the difference between the system pressure and the rated pressure of each pump will be different, which will cause the displacement of each pump to be different, and the total output flow of the system will not reach the rated flow. The wear of each pump is different;

[0008] Second, the variable variable pump 401 is at the maximum displacement and rated pressure at the moment of starting. When the outlet pressure is greater than the rated pressure, the displacement of the variable variable pump 401 is reduced, that is, starting with load, which will cause the instantaneous load to exceed the rated load. , which directly leads to the decrease of the reliability and life of the pump and its motor;

[0009] Third, under the standby condition of the hydraulic station, the pump has no output flow, and the pressure of the hydraulic station is 3 bar higher than the rated pressure. At this time, the displacement of the pump is reduced to the minimum, which only meets the internal leakage, but because of the high pressure, power loss Still relatively large, and being at high pressure all the time will affect the reliability of the system;

[0010] Fourth, the height difference of the equipment on the drilling platform reaches tens of meters, and the oil return back pressure is set by the check valve 411 in the existing hydraulic station, which cannot be adjusted. For high-altitude equipment, the oil return back pressure may be too low, causing the pipeline to be emptied, which directly affects the performance, response performance and reliability of the equipment.

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