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:: General :: Idle Chat or BS :: Sea constraints-Lowering Jack-ups Author Topic: Sea constraints-Lowering Jack-ups (Read 529 times) holdril Leading Member member is offline Joined: Jun 2003 Gender: Male Posts: 188 Location: PERTH WESTERN AUSTRALIA Sea constraints-Lowering Jack-ups « Thread Started on Oct 7, 2009, 4:32am » I am trying ascertain how much rig time is spent, world wide, waiting on weather, i.e., sea state, waves too high wave period too short. To start the statistic The Bay of Bengal this year I know of two separate forty day intervals and a twelve day wait. That's at least one million dollars. « Last Edit: Oct 7, 2009, 10:08am by Leonard » Link to Post - Back to Top   Logged Drilling Engineer ldd128 Member member is offline Joined: Apr 2008 Gender: Male Posts: 7 Re: Sea constraints-Lowering Jack-ups « Reply #1 on Oct 7, 2009, 6:13pm » In the Bay of Bengal and other places around the globe, if you miss the weather window, one can count on having to wait on weather. I am not sure how much time is wasted but it has to be alot of hours. In early 80's we towed a rig in a circle offshore Kenya for 30 plus days and the weather forecast did not look any better for the next 30 days, so we towed it back across the Indian Ocean. It would be an interesting study. LD Link to Post - Back to Top   Logged drilling Leading Member member is offline Joined: Mar 2003 Posts: 85 Re: Sea constraints-Lowering Jack-ups « Reply #2 on Oct 11, 2009, 3:01am » What info do you need? Just the time lost WOW, not pulling the legs free, time towing or lining up on location just the time in the drilling report as WOW I take it this will be on going so you will have to remind members every so often, say once a month Link to Post - Back to Top   Logged Leonard Administrator member is online To-days readers are tomorrow leaders: Joined: Mar 2003 Gender: Male Posts: 2,623 Location: England/Singapore Re: Sea constraints-Lowering Jack-ups « Reply #3 on Oct 11, 2009, 4:20am » Only down time due to WOW is needed, no need for the rig name however location will be a big help. I will try to remind members once a month to keep things up to date. I will also use this post to keep tags on things Link to Post - Back to Top   Logged Resume at holdril Leading Member member is offline Joined: Jun 2003 Gender: Male Posts: 188 Location: PERTH WESTERN AUSTRALIA Re: Sea constraints-Lowering Jack-ups « Reply #4 on Oct 11, 2009, 5:07am » Thanks for starting this thread. I am certain that when a value is determined for this lost time efforts will be made to address the surrounding issues. When contrbutors offer info, albeit annecdotal , the year and the area where it occurred would assist the preparation of the data base. Link to Post - Back to Top   Logged Drilling Engineer pigeon Member member is offline Joined: Aug 2006 Gender: Male Posts: 7 Re: Sea constraints-Lowering Jack-ups « Reply #5 on Oct 11, 2009, 1:28pm » Jackup operations on the East Coast of Canada demand no more than 1.5 m seas for an 8 hour period to jack down or up. An operation here has just experienced 5 days of WOW before jack down was possible. Increased WOW time is expected during winter operations with another operator. Link to Post - Back to Top   Logged holdril Leading Member member is offline Joined: Jun 2003 Gender: Male Posts: 188 Location: PERTH WESTERN AUSTRALIA Re: Sea constraints-Lowering Jack-ups « Reply #6 on Oct 12, 2009, 6:29am » The type of constraints are reasonable 'safety considerations.' Bigger rigs with different can dimensions and leg spacings require different values but the constraint is there. In the Cyclone season in the Bay of Bengal, some contractors refuse to move the rig. Any knowledge of such rules would help build the data base. i am hoping to make this activity even more safer by collecting this data and creating a universal set of rules. Link to Post - Back to Top   Logged Drilling Engineer Leonard Administrator member is online To-days readers are tomorrow leaders: Joined: Mar 2003 Gender: Male Posts: 2,623 Location: England/Singapore Re: Sea constraints-Lowering Jack-ups « Reply #7 on Oct 13, 2009, 10:18am » Posted on Interesting topic, this is something that should be considered when looking for a jack up rig. Not all jack up rigs are alike when it comes to WOW down time. Even though a lower cost day rate like a L780 (Mod 2) may cost more than a higher price Mod 5 if the drilling program includes several rig moves. On the other hand if the program is long duration at one platform it may well be more cost effective to suffer the long wait on weather times with a lower cost rig. It's hard to believe but not everyone takes these factors into consideration when tendering for a jack up rig. Regards Dan Link to Post - Back to Top   Logged Resume at Leonard Administrator member is online To-days readers are tomorrow leaders: Joined: Mar 2003 Gender: Male Posts: 2,623 Location: England/Singapore Re: Sea constraints-Lowering Jack-ups « Reply #8 on Oct 13, 2009, 10:30am » Posted on I have spent several weeks in a row waiting on weather while working West Of Shetlands (UK) costing millions of dollars. Not uncommon in that area during winter period. Link to Post - Back to Top   Logged Resume at holdril Leading Member member is offline Joined: Jun 2003 Gender: Male Posts: 188 Location: PERTH WESTERN AUSTRALIA Re: Sea constraints-Lowering Jack-ups « Reply #9 on Oct 13, 2009, 11:24am » Would a mechanism to lower the jack-up int the heaving seas with out stress, address this issue. Need some input from Noble Denton or the rig designers. Link to Post - Back to Top   Logged Drilling Engineer kiwioil New Member member is offline Joined: May 2003 Gender: Male Posts: 1,759 Location: Sarawak Malaysia Re: Sea constraints-Lowering Jack-ups « Reply #10 on Oct 13, 2009, 10:53pm » All the questions I hear are about 'lowering' the jack-up. How many 'extra' hours are spent in the, 'just as dangerous period', of releasing the legs from the seabed. I have witnessed many hours of the deck under water with attempts to release a leg from the seabed. And when it does 'break free' from the suction of deep penetration, the sudden leveling of the barge is 'frightening'. Weather always plays a part in 'lowering' or 'raising' the barge. Weather or sea condition has 'always' had to be considered when locating jack-ups, but all the careful planning goes out the window, when the time comes to locate or move. Link to Post - Back to Top   Logged tsurdal Member member is offline Joined: Jun 2009 Gender: Male Posts: 3 Location: Stavanger, Norway Re: Sea constraints-Lowering Jack-ups « Reply #11 on Oct 16, 2009, 11:34am » I haven`t been working offshore that long yet. But i haven`t experienced anything more than 2 days so far on WOW. I worked on the worlds largest Jack-up rig, the maersk Inspirer on the Norwegian sector up untill now, and i am going to the next largest jack-up the Innovator next. My experience is that there is a lot less WOW on the newer rigs. I personally wouldn`t work on a rig that was built before the year 2000. Link to Post - Back to Top   Logged ramonbaquit Member member is offline Joined: Aug 2009 Gender: Male Posts: 3 Re: Sea constraints-Lowering Jack-ups « Reply #12 on Oct 16, 2009, 8:02pm » I haven`t been working offshore that long yet. But i haven`t experienced anything more than 2 days so far on WOW. I worked on the worlds largest Jack-up rig, the maersk Inspirer on the Norwegian sector up untill now, and i am going to the next largest jack-up the Innovator next. My experience is that there is a lot less WOW on the newer rigs. I personally wouldn`t work on a rig that was built before the year 2000. tsurdal If you've only worked on one rig, you dont really have the experience to say that there is less WOW on newer rigs, also, I'd like to know why you wouldn't want to work on a pre-2000 rig, there is some really nice rigs out there, pre-2000, try working on some of them, then in a few years time, you can give us the benifit of your 'experience'. Ramon Link to Post - Back to Top   Logged aussiebill Member member is offline Joined: Jul 2008 Gender: Male Posts: 9 Re: Sea constraints-Lowering Jack-ups « Reply #13 on Oct 17, 2009, 6:29am » Worked on a jack-up off North-West Australia ( out of Onslow ) 12 years ago...there was one location we spent 2 weeks towing around waiting for the swell to ease off so we could lower the Legs... There were a couple of attempts made to lower but as soon as the Spud cans were down a few metres the stability of the Rig was such that most of us already had an exit point in mind on the high side if she kept rolling...quite an experience for those onboard and it takes a while to jack those legs back up and stabilize again... Link to Post - Back to Top   Logged rzakirov Full Member member is offline Joined: Sept 2007 Gender: Male Posts: 10 Re: Sea constraints-Lowering Jack-ups « Reply #14 on Oct 20, 2009, 3:58am » That's at least strange to visit one rig and come to the conclusion about the rest of the jack-up fleet. We could not position the rig built in 2008 due to bad weather in the same year of 2008 for nearly 2 months. I do not believe that one can actually create any valuable data base as each case is very much individual even for the same oil field. For example, in 2007, at the same field we managed to position the old baby built in 1984 without any WOW's. Both cases happened in mid-autumn. Link to Post - Back to Top   Logged holdril Leading Member member is offline Joined: Jun 2003 Gender: Male Posts: 188 Location: PERTH WESTERN AUSTRALIA Re: Sea constraints-Lowering Jack-ups « Reply #15 on Oct 20, 2009, 4:39am » From what I am hearing the Lowering of Jack-ups due to sea state in unpredictable. However, when it is memorable it is in months not days. I will make an assumption that a method to eliminate the problem may be a reasonable investment. Link to Post - Back to Top   Logged Drilling Engineer rzakirov Full Member member is offline Joined: Sept 2007 Gender: Male Posts: 10 Re: Sea constraints-Lowering Jack-ups « Reply #16 on Oct 20, 2009, 7:18am » Holdril, How do you want to do this? The weather limitation is pretty much conservative and fixed in the rig's Marine Operations Manual generated by rig designers and approved by Class. Some of the limitations are seriously out from the other planet (as water current, for example). They limit to 1 knot. So, all rigs are supposed to drill in lakes only. You have to invest very much heavily to "convince" designers & classification societies to use common sense. Link to Post - Back to Top   Logged holdril Leading Member member is offline Joined: Jun 2003 Gender: Male Posts: 188 Location: PERTH WESTERN AUSTRALIA Re: Sea constraints-Lowering Jack-ups « Reply #17 on Oct 20, 2009, 8:45am » The problem that has to be overcome is the stresses that are generated on the legs when the hull is buffeted by the sea. I have an idea, a solution. My problem is collecting sufficient evidence. I believe that the cost of WOW will justify the use of my proposed solution. Is there any other issue, save the stress on the legs? Who would be a world authority on this matter? Link to Post - Back to Top   Logged Drilling Engineer Douggie Full Member member is offline Joined: Aug 2008 Gender: Male Posts: 15 Location: SEAsia Re: Sea constraints-Lowering Jack-ups « Reply #18 on Oct 20, 2009, 10:26pm » From September to February we experience the Tropical Depression offshore Vietnam . We just had our 11th Typhoon and recovering from the impact and some rigs had to shut down drilling to fix broken and damage parts. Central Vietnam and offshore Danang is a headache for Jackups. WOW in offshore Hanoi was once up to 3.1/2 months. Southern part of VN is stable and sea swells comes and goes and always have window to tow and jack down in a day or two. Working in Northern sectors really needs proper execution as the Typhoon varies last minute in directions and strength....WOW is one factor all the boys loved cos evacuation time means standby time in town. If the sea is going to be rough for a long period, rigs goes close to shore for maintenance and it won't be WOW on the daily report but rig maintenance and inspection etc.etc...as it is quite predictable here in VN to plan ahead in Typhoon season. Link to Post - Back to Top   Logged gus Full Member member is offline Joined: Mar 2009 Gender: Male Posts: 11 Re: Sea constraints-Lowering Jack-ups « Reply #19 on Nov 1, 2009, 1:14pm » Quote: But all the careful planning goes out the window, when the time comes to locate or move. Kiwioil: Where have you been for the past 10 or 15 or so years? I have been working jack-ups for the past 20 years, maybe in the old days this was the case, but from where I stand every precaution is taken when moving. Rigs now have rig movers and insurance people on board that take the full responsibility of the move. When the rig is ready to move, that is when it is ready to jack the senor man on the rig hands it over to the rig mover, and normally not handed back until the rig is jacked back up, Pulling the legs free, agreed it can be a little frightening when a leg come free, but rigs are designed for this, however in all my career I have never seen the rig mover or toolpusher continue to try moving the rig in bad weather, I have seen them jack back up on pending bad weather and sit there and wait for a clear window. Link to Post - Back to Top   Logged frameasser Full Member member is offline Joined: May 2008 Gender: Male Posts: 14 Re: Sea constraints-Lowering Jack-ups « Reply #20 on Dec 11, 2009, 12:54am » there is a rig in kiwi that was WOW for 3 months Link to Post - Back to Top   Logged Forum Jump--------------------» Home--------------------» About The Drillers Club--------------------- Read more about the Drillers Club.--------------------» Oil, Drilling and World news section --------------------- Oil, Drilling and World news section --------------------» Club YouTube and Video files --------------------- Club YouTube and Video files --------------------» General--------------------- Oilmans' Notice Board - Idle Chat or BS- Oil Field Abbreviations and Acronym- Supporting Companies- Downloads, Tools, Useful Data Sheets and Company Links- Oil Field Humour- Oil Field Safety and Procedures - Drilling Glossary - Drilling courses and training schools- Company Profiles and New Builds- Safety Alerts--------------------» Drilling--------------------- Drill String and Bits- Casing and Cementing- Well Control --- Lost Circulation- Managed Pressure Drilling- BOP Equipment- Drilling Fluid- HPHT Drilling- Deep Water Drilling- Underbalanced Drilling- Coal bed methane drilling- Directional and Horizontal Drilling- Down Hole Problems- H2S- Casing While Drilling- Expandable Tubular- Oil Well Logging and Logging tools--------------------» Workover and Completion--------------------- Oil Well Completions- Coiled Tubing- Stripping and Snubbing- Workover Fluids - 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