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Posts treating: "casing"
Monday, 16 January 2017
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The Lull Before Asut-Tesoru...
It's been a rather quiet couple days here on the JR, as the drillers have been diligently drilling what will ultimately become a 200 m cased drill hole with an ROV landing pad on top, for future instrumentation and use as a venue for real-time measurements of the unusual upwelling fluids we encountered at Yinazao Seamount. read moreInnovative Micropile Construction with DTH System
Our friends at Deep Excavation posted about an interesting micropile case study in Northern Baltimore County for a bridge replacement project. The project consisted of 38 Micro Piles; 7†OD X 38 ft. deep including a 7 ft. rock socket, installed on a 3/1 batter, load tested to 272,000 lbs. What caught my attention is the down the hole hammer system used for installing the micropiles. The system uses a ring bit to install the casing and allow the drill string to continue beneath the bedrock [...]Salute to the techs!
Today we are still waiting to get back to coring as the final stages of re-entering the hole after the casing is completed. This gives us the chance to thank our valiant technical staff that help keep all the labs running smoothly on a daily basis. readRe-entry Cone Deployed
It had been put together a few days ago but today was the day that the re-entry cone was finally deployed and made its journey down to the bottom of the sea floor ready to help us fit the casing and also to enter and reenter the hole several times. readDownhole logging
Now that we have drilled down to the depths that we need before setting casing and drilling a very deep hole all the way to the basement we have decided to stop and measure downhole geophysical logs. This is a method in which sensors are deployed down the borehole to record different aspects of the physical properties of rocks. readIntroducing the LS™250 MiniSonic™, a Versatile Compact Sonic Rig
SALT LAKE CITY, April 13, 2015 /PRNewswire/ -- Boart Longyear (www.BoartLongyear.com), the world's leading provider of integrated drilling services and drilling products, is proud to introduce the LS™250 MiniSonic™, a compact rig suitable for a wide variety of environmental, geotechnical, water and mining projects. Capable of drilling to depths of up to 250 feet (78m) when used with 4.75 inch (121mm) casing, the wide 600mm rubber tracks provide low ground pressure (.28 bar/4psi) [...]Site U1440B activity; A unique way to install a reentry system
Since we have already drilled a hole at Site U1440 (approximately 20 meters from where we are now) and collected sediment cores from that hole up until we hit hard rock, we started our second hole in a whole new way. Because this hole will be used to obtain cores from deeper depths we need to 'case' the hole to keep it stable. We also need to be able to re enter it several times. readUpdate on Access Pit for Repairing Bertha TBM
There hasn’t been much to report recently for the Alaskan Way Viaduct Tunnel Project in Seattle. As you probably know, Bertha has not advanced since about December of 2013 after drilling through an abandoned steel well casing left over from engineering studies. Whether it was the casing or boulders, or something else that damaged the seals around the giant TBM’s cutterhead, they have some major repair planned. If you like, feel free to read more about what happened with [...]POOHing
We’re just over three weeks in to our trip, the casing is set, the drill crew is tripping out the pipe (POOHing-Pulling out of hole) and is at present is preforming a “cut and slip” which means replacing ~35meters of cable which travel over the crown sheave and hold our heavy (500,000+ lb) drill string. readExp 350: JR Casing Record!
On May 9th, 2014 the JOIDES Resolution set a new record for it’s deepest set casing, beating the old record by 19 meters (leg 186 hole 1151B)!!! The Siem offshore crew set casing down to 1,087 meters below sea floor (mbsf), that’s about 0.7 miles of casing! But what is casing? readWSDOT Denies $125M Change Order for Seattle Tunnel Partners
The WSDOT announced recently that the Seattle Tunnel Partners Joint Venture has requested a total of $188 million in change orders so far, and that the Department has denied $157 million of those, with $31 million worth still under review. Among the change orders rejected was one for $125 million plus additional contract time because STP claimed the Bertha TBM was damaged by a steel well casing. WSDOT's position is that the location of the well casing was included in the contract documents. [...]Bad News Blog.
Just a quick note to keep everyone updated on activities onboard the JR. The last several cores have come up less than perfect, showing signs of problems with the bit or the material we're drilling into. Some of the last core contained lots of drilling mud, which looked like chocolate milk, not a good sign. readVisitors
Today was a relatively quiet one for the science party, while at the same time on the rig floor the final string of casing has been lowered into the hole successfully and is being cemented into place, which is the last phase before the renewal of coring activities. readShip tours
Because we are waiting for the casing to be done the science party is taking the opportunity to see the rest of this large ship beyond the spaces that we normally inhabit lead around by the IODP Operations Superintendent Steve Midgeley. readFair weather
The wind gods appear to have been appeased for the time being at least as we are now enjoying our best conditions here for several days under blue skies if still somewhat of the breeze from the direction of the Philippines. This means that the job of casing can go on and bring us a day close to the return of core. readShrinking cups
One way that we can usefully employ the time installing casing is to prepare something rather unusual and unique which is associated with deep-sea research and that is the shrinking of polystyrene cups. readMore rough weather
Today has been another day of steady progress is setting the casing, with continued activity on the drill floor and more report writing inside the lab stack. readWindy day
Our wait for the return of core began in earnest today as the casing started to be hung from the newly installed re-entry cone. The first to go is the 20” diameter pipe through which the progressively smaller and smaller “stands” of casing are fed and then cemented into place, to form the string of metal tubing that will line the upper part of the hole. readNew Site Preparations
Now we are at our new drilling site preparations have begun for the deep drilling we will attempt here, around 1900 m below the seafloor. Today tests were conducted to determine the stiffness of the seafloor, which will have to bear the weight of the re-entry cone (see photo) that in turn is the device from which the casing that protects the top of the hole will be hung. readTop concepts:
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