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A riser system for transporting a slurry from a position adjacent to the seabed to a position adjacent to the sea surface

A riser and mud technology, applied in the field of riser systems, can solve problems such as loss of revenue

Inactive Publication Date: 2014-07-16
MARINE RESOURCES EXPLORATION INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The riser system must be able to move the mud to the surface as reliably as possible because any downtime means a huge loss in revenue

Method used

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  • A riser system for transporting a slurry from a position adjacent to the seabed to a position adjacent to the sea surface
  • A riser system for transporting a slurry from a position adjacent to the seabed to a position adjacent to the sea surface
  • A riser system for transporting a slurry from a position adjacent to the seabed to a position adjacent to the sea surface

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Embodiment Construction

[0037]The entire system (including surface vessel and subsea mining vehicle) is generally described in WO2010 / 000289. A schematic diagram of the entire system is given in FIG. 9 .

[0038] The overall system consists of a surface vessel 100 at the sea surface 102 and one or more mining vehicles 103 which move across the seabed 4 to pick up sediment from the seabed and form mud, along the flexible riser 105 pumps the mud. Said vehicle is described in the pending application (Agent No.: P113709GB00). The flexible risers 105 are connected by rotatable ball and socket joints to respective mud risers 1 which extend down to a position approximately 200 meters above the seabed. It should be noted here that the dump valve 106 allows mud to be dumped from the standpipe 1 if a problem is encountered. These valves 106 open to the water return line for spraying water. Diffusers are positioned at the bottom of each riser to reduce the water exit velocity. As described in more detail b...

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Abstract

A riser system for transporting slurry from the seabed to the sea surface is provided. The riser system comprises a first and second riser, a slurry pump system (17) to transport slurry up one of the risers, and a waste water pump system (107) to return waste water down one of the risers. The slurry pump system and the waste water pump system are selectively connectable to each of the risers to allow each riser to be either a slurry riser (1) or a waste water riser (2). With this arrangement, if a slurry riser develops a leak partway along its length the waste water riser can be converted into a slurry riser such that operation can continue.

Description

technical field [0001] The present invention relates to a riser system for transporting mud from a location adjacent the seabed to a location adjacent the sea surface. Background technique [0002] In WO2010 / 000289 a method and apparatus for mining seabed deposits are disclosed. It consists of tracked vehicles that travel across the seabed, agitating and pumping sediment. The resulting slurry is then transported up the riser system to surface vessels for further processing. [0003] The riser system had to be able to move the mud to the surface as reliably as possible because any downtime would mean a huge loss in revenue. At the same time, in order to follow tracked vehicles and surface vessels, the riser system is intended to move through the sea and therefore needs to be as light and low-profile as possible. Contents of the invention [0004] The present invention seeks to provide a riser system that can operate effectively under these circumstances. [0005] Accord...

Claims

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Application Information

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IPC IPC(8): E21B17/01E02F7/10E21B17/18E02F7/00E02F3/90
CPCE02F3/90E02F3/905E02F7/005E02F7/10E21B17/18E21B41/005Y10T137/0402E21B17/012E02F3/88E21B17/01
Inventor D·C·帕特里丘
Owner MARINE RESOURCES EXPLORATION INT