We have 36" conductor joints from Dril-Quip with 2 pads welded near the top of the joint. These pads stick out 6cm from the pipe body. There are 8 threaded holes, padeyes are bolted to these pads into the threaded holes.
This allows padeyes to be quickly removed during running but leaves these pads sticking out.
Dril-Quip advises that they have not had any problems jetting conductor with these pads sticking out. Does anyone have experience of jetting with these pads on? If so did it go OK, were there any problems that might be attributed to the pads? Thanks for your help folks.
Hi Steve this seems like an older post so maybe you have had enough responses, I would repeat what DQ have advised, I work for DQ, and we haven't see any issues with bolt on pad eyes whilst jetting. There are other non-welded and non pad eye options if you are looking for a slicker OD.
Your box connectors have (or should have) a handling groove, there are wrap around elevator handling tools which interface with this groove to create a temporary elevator shoulder, then the conductor is run on side door elevators, these wrap around clamps are available as part of the rental package PN 4-201033-02.
There are also 6-5/8” Drill Pipe handling tools for the conductor, also available from rental stock, PN 200377-02
We have been using these type of pads in Angola, Senegal and the GOM without any issues at all.
However, we have moved away from padeyes all together and now use the Frank's hydraulic slips and Jet string elevator which will pick up on "slick" OD pipe without the use of elevator rings, horseshoe elevators, etc. Saves a lot of time in critical path of removing the bolt-on padeyes or even worse the old weld on padeyes that have to be torch cut off.
The DSV offshore was pretty wary of these things and I wanted to see if we could get some field experience feedback. I can now offer that!
The last time I ran a 36" conductor on O R Olympia (7 joints) it took 12 hours, including gas axing off padeyes. On this well it took 5.5 hours. We also didn't have to mobilise extra welders, bottles, cutting gear etc. So it all seemed to work fine.
The conductor was jetted to depth fine and is now soaking. I haven't had chance to analyse the jetting record but there does not seem to have been anything to indicate that the remaining pads were in any way an issue.
The small Cross section of the padeye mounts in question that are presented to the formation is unlikely to have an impact on the overall ability of the pile to reach depth during jetting. Given that the soil in the immediate vicinity of the OD of the casing is not unlike a weak slurry during the jetting / reciprocation process of installation with the soil having been extensively remoulded during this process.
As opposed to driven conductors (pile hammer installation) where the lateral forces around the pile are significantly increased by the driving forces / displacement of soil from under the toe forcing moisture away from the wall of the casing thus requiring a longer period of time for restitution / pore pressure dissipation. Jetting / removal of soil and adding to the water content of soil surrounding the casing tends to reduce the lateral forces in the vicinity of the pipe to lower than that of the natural ambient lateral pressure of the surrounding soil, this allows for relatively rapid restitution / increases in axial capacity and tends to negate the impact of specific soil displacement (tracking) attributable to the padeye mounts.Rgds
Thanks Pete. Nearest offset is dozens of miles away and we don't have an accurate subseabed picture of the sediments. DQ have said that they haven't had any problems running these, I wanted to see if anyone on SPREAD had actual experience. I doubt that they would cause us a real problem such as stopping us short of where we want to get to (though if we are at 5.5m and our hard limit is 5m stickup I might change my mind!).
Once the 22" is landed and cemented, communication up the outside shouldn't really be an issue.