Threaded connection having a dissymmetrical helical profile
AssigneesVallourec Oil and Gas France, Nippon Steel Corporation
InventorsAnthony Foulogne, Pierre Martin
Life of this patent
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Abstract
Threaded tubular connection for the casing of hydrocarbon wells obtained by makeup of a male tool joint with a female tool joint, the connection comprising a threaded portion, such that the male and respectively female threaded portions each comprise a helix provided with a load flank, a thread crest, a stabbing flank, a thread root, such that a pitch of the load flank (LFLp, LFLb) and a pitch of the stabbing flank (SFLp, SFLb) fulfills the following condition: [Math 14] SFLb=LFLb=SFLp=LFLp=k, A tooth width (Wtp) of the male helix and a tooth width of the female helix (Wtb) are such that [Math 15] 50%<Wtp/Wtb<80% or [Math 16] 50%<Wtb/Wtp<80% and [Math 17] Wtp Wtb<k.
Claims20
A threaded tubular connection for the drilling and/or exploitation of hydrocarbon wells, comprising a first tube equipped at a first distal end with a male tool joint and a second tube equipped at a second distal end with a female tool joint, the male tool joint being capable of being assembled by makeup with the female tool joint, the first tube assembled to the second tube together define a longitudinal axis,
- the male tool joint comprising a male threaded portion,
- the female tool joint comprising a female threaded portion engaged with the male threaded portion when the connection is assembled,
- the male and female threaded portions each comprising at least one helix equipped with a load flank, a thread crest, a stabbing flank, a thread root, such that a pitch of the load flank LFLp and a pitch of the stabbing flank SFLp of the male threaded portion, and respectively a pitch of the load flank LFLb and a pitch of the stabbing flank SFLb of the female threaded portion fulfil the following condition, for at least two consecutive turns of the respective helices of the male and female threaded portions:
- SFLp=LFLp=SFLb=LFLb=k [Math 14]
- and such that along the longitudinal axis, in these at least two consecutive turns, a tooth width (Wtp) of the helix of the male threaded portion and a tooth width (Wtb) of the helix of the corresponding female threaded portion are such that
- 50
-
- %
- <
- Wtb
- Wtp
- <
- 80
-
- %
-
- Or
- [
- Math
-
- 15
- ]
- 50
-
- %
- <
- Wtp
- Wtb
- <
- 80
-
- %
-
- And
- [
- Math
-
- 16
- ]
- Wtp
- +
- Wtb
- <
- k
- .
- [
- Math
-
- 17
- ]
Dependencies are inferred from the claim text.