Mechanical sealing and flushing method and device of seafloor mud lifting pump

A technology of mechanical seals and flushing devices, which is applied to components, mechanical equipment, pumps, etc. of pumping devices for elastic fluids, can solve problems such as high cost and reliability, and achieve improved service life, reduced auxiliary parts, The effect of long operating life and reliability

Inactive Publication Date: 2013-10-02
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
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Problems solved by technology

[0003] If the traditional self-circulating mechanical seal flushing method is used, it is necessary to introduce the seal flushing pipeline from the drilling platform. For deep water drilling, too long seal flushing pipeline will b

Method used

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  • Mechanical sealing and flushing method and device of seafloor mud lifting pump

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Embodiment Construction

[0016] The present invention is elaborated below in conjunction with accompanying drawing:

[0017] A method for flushing the mechanical seal of a subsea mud lift pump, the method comprises a seawater pump 1 placed in seawater coaxial with the motor, the pump outlet 2 communicates with the seal flush port 7 opened on the seal cavity through the seal flush pipe 6, and the pump The inlet 3 is directly communicated with seawater, and the seawater is pressurized by the action of the impeller 4 in the seawater pump 1 to realize the flow of seawater and flushing of the sealing surface.

[0018] The flow boost of the seawater flushing liquid is realized by the seawater pump 1 placed in the seawater coaxially with the motor.

[0019] A mechanical seal flushing device for a subsea mud lift pump, which includes a seawater pump 1 placed in seawater coaxial with the motor, a pump outlet 2 opened on the seawater pump 1, and a pump inlet 3 opened on the front cover of the seawater pump 1 ,...

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Abstract

A mechanical sealing and flushing method and device of a seafloor mud lifting pump comprises a seawater pump, a pump outlet, a pump inlet, an impeller, an O-type ring and a seawater flushing pipe. The seawater pump is arranged in seawater and is coaxial with a motor, the pump outlet is formed in the seawater pump, the pump inlet is formed in a front end cover of the seawater pump, the impeller is arranged inside the seawater pump and is connected with a motor shaft through keys, the O-type ring is arranged between the seawater pump and the front end cover of the motor, and the seawater flushing pipe is connected with the pump outlet and a sealing and flushing opening. The seawater pump is immersed in the seawater, the pump inlet is directly communicated with the seawater, the seawater is boosted through the effect of the impeller inside the seawater pump, and seawater flowing and flushing to a sealing face are achieved. The mechanical sealing and flushing method and device of the seafloor mud lifting pump is simple in structure, sealing liquid does not need to be drawn from a sea surface to flush a circulation pipeline, the problem of sealing face flushing of the seafloor mud lifting pump of a seafloor mud lifting drilling well can be effectively solved, meanwhile, the mechanical sealing and flushing method and device of the seafloor mud lifting pump can be applied to ocean mining and other seafloor solid-liquid two-phase conveying pumps, and the demands for mechanical sealing and flushing of deep sea seafloor solid-liquid two-phase conveying pumps are met.

Description

technical field [0001] The invention relates to a mud recovery drilling technology without a riser, in particular to a method and device for flushing a mechanical seal of a seabed mud lift pump. Background technique [0002] Riserless mud recovery drilling technology is a realization of dual-gradient drilling technology. Different from other dual-gradient drilling system solutions, single-gradient mud is used in the riserless system, but the subsea wellhead pressure is controlled close to seawater hydrostatic pressure by subsea pumps. Realize dual-gradient drilling. In this system, the drilling fluid is pumped into the drill pipe from the sea surface, reaches the bottom of the well through the drill pipe, impacts and breaks the rock and carries the cuttings back up the borehole annulus, and enters the subsea lift pump through the rotary diverter device at the top of the annulus. Cuttings and drilling fluid are returned to the drilling platform through the mud return pipelin...

Claims

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Application Information

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IPC IPC(8): F04D29/70
Inventor 周昌静陈国明肖鑫
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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