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esson 5B

High-Pressure Riser

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Based on

Low Riser Return and Mudlift System,

by Sigbjrn Sangesland and Brre Fossli

!ro" #$% &ee' (ffs)ore *e") +onf,

ew (rleans, o- 1./10, 22

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Low Riser Return and Mudlift System

High-Pressure Small Diameter Riser

Longer Hole Sections Fewer Casing Strings

Mud Level in Riser far elow Sea Level

Mud-Lift Pum! "ee!s Mud Level low

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Standard

Dee!-water

Drilling

S#stem using

$% &

'ellhead

and ($ Riser

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!ore !ressure,Fra"ture

!ressure and

+asing !rogram

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1. 045

6ell)ead and

12 7 Riser

wit) LowRiser Return

System

8LRRS9

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!ore !ressure,

Fra"ture !ressure and

+asing !rogram for

LRRS

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+ost +om'arison between a +on-entional 21

and a 1; 812 7 $&9

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Some LRRS Advantages

6ellbore 'ressures "an be ")angedwit)out ")anging t)e mud weig)t

)his is accom!lished # raising or lowering

the mud level in the riser >nderbalan"ed drilling "an often be a")ie-ed

Drilling with water and a reduced fluid levelin the riser results in anormall# low!ressures in the wellore

*)e riser "an a"t as a mud 4 gas se'arator

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More LRRS Advantages

6ell "ontrol is sim'lified

)he riser can handle high !ressures*o cho"e or "ill lines are necessar#

&rilling "osts are redu"ed

Less time to run smaller riser

+se smaller rigFewer casing strings

!otential for .? redu"tion in well "osts