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Hi Victorio,
many thanks. Do we have please any geotech information, also coming from other projects in the area, for confirming the feasibility of the HDD crossings? As per what I saw, obviously from the surface, the sediments on the north shore of both rivers are very coarse.
Thanks
pier
Da: Victorio Carabelli <Victorio.Carabelli@pumpco.cc>
Inviato: giovedì 30 ottobre 2025 16:08
A: Marinelli Giacomo <Giacomo.Marinelli@bonatti.it>; Badiali Edoardo <Edoardo.Badiali@bonatti.it>; Profili Andrea <Andrea.Profili@bonatti.it>; Frassinelli Alfredo <Alfredo.Frassinelli@bonatti.it>
Cc: Miguel Ernesto Perez <mperez@contreras.com.ar>; Gentili Sara <Sara.Gentili@bonatti.it>; Bruzzo Piermaria <Piermaria.Bruzzo@bonatti.it>; Robert Mares <Robert.Mares@pumpco.cc>; Ricardo Bayley <Ricardo.Bayley@pumpco.cc>; Julian Lell <Julian.Lell@pumpco.cc>;
Ricardo Romero <rromero@contreras.com.ar>; James Robertson <jrobertson@contreras.com.ar>
Oggetto: HDD XINGS
Dear all, I am attaching a draft of the starting and ending points and bore lengths of the HDD Xings for the main Rivers Neuquen and Limay.
For the three pipelines running in parallel at the Neuquén River crossing, the separation of the HHD center line must be between 30 and 50 meters to mitigate the risk of frac-out —the unintended release of bentonite drilling mud from the borehole to the surrounding ground or surface — during pilot bore and subsequent reaming operations. After a proper geotechnical bore campaign to determine the lithology of the crossing area, it will be possible to reduce these distances, but not during this stage of the design.
For both crossings, it will also be necessary to drill an additional pilot hole for the mud return between the banks and to insert the fiber-optic cables for the communication system.
We do not recommend introducing a FO conduit together with a pipe string, due to the risk of collapsing the borehole or getting the column stuck during the pullback of the pipe string.
LIMAY RIVER XING
HDD 48” API 5LX-80 pipeline wt. 1”, length 900 meters, bore hole 60”/70”, string weight 600 tons (1.350.000 lbs), estimated minimum rig capacity 500.000 lbs
Starting point at PK 81+950, ending point at PK 82+950
HDD FO, 8” HDPE casing pipeline
NEUQUEN RIVER XING
Starting point at PK 81+950, ending point at PK 82+950
HDD 12”, 20”, 24” API 5LX-70 pipelines, with a length of 1100 meters, bore hole sizes of 24”/30”, and 36” respectively.
"C5-C12" 12” (Condensate pipeline) wt.500 (12,7 mm) pipe string weight of 108 tons (240.000 pounds), and an estimated minimum rig capacity of 72.000 pounds.
“C2" 20” wt. 469 (11,91 mm) pipe string weight of 160 tons (355.000 pounds), and an estimated minimum rig capacity of 106.000 pounds.
“C3+" 24” wt. 625 (15,88 mm) pipe string weight of 260 tons (575.000 pounds), and an estimated minimum rig capacity of 170.000 pounds.
HDD FO, 8” HDPE casing pipeline
VC