Device for removal and filtration of drilling fluid

Details Device for removal and filtration of drilling fluid Device for removal and filtration of drilling fluid

2004-11-17

2008-10-07

Beach, Thomas A (Department: 3671)

Wells

Screens

Concentric pipes

C166S357000, C175S066000, C175S206000, C210S314000, C210S435000

Reexamination Certificate

active

07431081

ABSTRACT:
The invention relates to a device for removal and filtration of drilling fluid at top hole drilling, where a suction module (10) comprises an extended, pipe-formed body (30), open at the top and which is arranged to an ocean-bottom penetrating pipe, through which a drill stem is led for drilling of the top hole, and where the pipe-formed body (30) comprises at least one outlet passage (32) in the pipe wall for export of return drilling fluid from the bore hole to a pump module (12). The invention is characterized in that the pipe-formed body (30) comprises a filtration device with through openings, where the mentioned openings are arranged to let through, to at least one outlet passage (32), return drilling fluid containing suspended material, such as swelling clay and stones, having a size that is less that the diameter of the inlet pipe of the pump or the openings of the pump.

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