July 20th, 2010
02:15 PM ET

BP’s trial & error: What’s worked and what hasn’t

[Updated 10:25 a.m., Aug. 6]

With oil gushing into the Gulf of Mexico for almost three months, every attempt to stop the leak has failed, or fallen short - until now. Oil finally stopped gushing from the well on July 15. We look back at how we ended up here: what BP has tried and done so far.

July 20, 2010

Solution: Static Kill
Scientists are weighing a new option called  "static kill” for permanently sealing it. The "static kill" would involve pumping mud into the well to force oil back into the reservoir below. This is similar to the "top kill" method that failed earlier (see below), except that now the oil isn't flowing - hence the word "static."

Read more on static kill at Time.com

Engineers are proceeding with the relief wells that eventually will pump concrete into the well bore to kill it from the bottom. A static kill, if pursued, would hit it from the top.

BP noted that the option could succeed where other similar attempts have failed because pressure in the well is lower than expected. Geologist Arthur Berman tells CNN's "American Morning" the relative simplicity of the static kill makes it an attractive option for BP.

BP finished pouring cement down the well on Aug. 6, completing the job earlier than expected. The process took six hours. Retired Coast Guard Adm. Thad Allen said the cementing phase of the "static kill" operation is not the end of the process, "but it will virtually assure us there's no chance of oil leaking into the environment."

July 10, 2010

Solution: New better-fitting containment cap
BP said it was going to remove the old containment cap, replacing it with another that has a better fit. Robots removed six giant bolts from the apparatus July 11 so the new cap could be positioned.

Scientists will then be able to gauge the pressure inside the well and determine whether the cap is holding in the oil or if crews will need to continue siphoning oil.

BP says it will conduct a “well integrity test,” which involves closing the stack end and stemming the flow coming from the well.

If it works, oil collection via the vessels, Q4000 and Helix Producer, will cease. BP will then close in on the perforated pipe. This process, which will be done in collaboration with U.S. government officials, could take up to 48 hours.

In the best-case scenario, the containment cap would have the ability to actually close down the valves and slowly contain all the oil – not plug the well.

If oil collection was still necessary, over the next two to three weeks, 60,000 to 80,000 barrels (2.52 million to 3.36 million gallons) a day could be collected as part of the containment process, BP Senior Vice President Kent Wells said. That's because the containment cap would allow four collection ships to access the well, rather than the maximum of three allowed by the old cap.

The oil giant said earlier as well that the cap "should improve containment efficiency during hurricane season by allowing shorter disconnect and reconnect times."

Coast Guard Adm. Thad Allen said he approved the cap-switch plan to take advantage of favorable weather predicted for coming days and because, once the switch is complete, the resulting capacity to contain oil "will be far greater than the capabilities we have achieved using current systems." Allen also stressed that once the capping device is on, "we would get the most accurate flow rate to date."

The oil stopped gushing out on the afternoon of July 15 -  the first time BP has been able to gain control since the the Deepwater Horizon rig exploded three months ago and triggered the catastrophe.

The "well integrity test" began on July 15 after two days of delays, first as government scientists scrutinized testing procedures and then as BP replaced a leaking piece of equipment known as a choke line.

BP cautioned that the oil cutoff, while welcomed, isn't likely to go beyond the 48 hours. Valves are expected to open after that to resume siphoning oil to two ships on the surface, the Q4000 and Helix Producer, as government and BP officials assess the data and decide what to do next.

As of July 19, testing on a capped oil well in the Gulf of Mexico continues as the federal government says BP has addressed questions about a seep near the well. Retired Coast Guard Adm. Thad Allen, the federal government's response manager for the oil spill, says that a federal science team and BP representatives discussed the seep during a conference call, including the "possible observation of methane over the well."

See progress on relief wells

June 16, 2010

Solution: Second containment system
BP said Wednesday it has started collecting oil gushing into the Gulf through a second containment system attached to the ruptured well. The new system is connected directly to the blowout preventer and carries oil up to a second ship, the Q4000. The Q4000 uses a specialised clean-burning system to flare oil and gas captured by this second system. The Q4000 uses a specialised clean-burning system to flare oil and gas captured by this second system.

This second system supplements the lower marine riser package (LMRP) cap containment system, which remains in operation, BP said. The new system is connected directly to the blowout preventer and carries oil and gas through a manifold and hoses to the Q4000 vessel on the surface.

Oil and gas collected from the blowout preventer reached the Q4000 at approximately early on June 16. Operations continue to stabilise and optimise the performance of the second containment system.

See progress on the relief wells

June 3, 2010
Solution: An altered version of "cut and cap"
BP went back to the drawing board June 3 and planned to cut away the remains of the damaged riser pipe with a robotic-arm shearing device. A containment dome would then be put over the blowout preventer's lower marine riser package, but the larger, less precise shearing device will have left a rougher cut than what the diamond wire cutter was supposed to offer.

The more primitive cut means that a rubber seal will not be as tight as previously hoped, so the dome may capture less of the oil. Nevertheless, the hope is that a good amount of the oil can be captured and brought to the surface until August, when BP is expected to be ready to use a relief well to seal the leaking well for good.Outcome
BP sliced off the remains of the damaged riser June 3, and Adm. Thad Allen, the federal government's response manager, called the news "extremely important." Robot submarines steered the new cap to the well later that evening. The cap placed over the top of the well funnels oil and gas to a surface ship, though oil is still spilling out from the cap and the valves.

On June 7, BP says that it has closed one of four vents on top of the cap, and that the process is working well. The company says it may not close all four of the valves because engineers think the valves may be releasing more gas than oil.

On June 10, scientists said as much as 40,000 barrels of crude are gushing into the sea every day. The previous estimate by researchers, made two weeks ago, was 12,000 to 19,000 barrels per day.

BP has collected about 73,300 barrels (about 3 million gallons) of oil since it placed a containment cap on its ruptured well, the company said.

June 1, 2010
Solution: "Cut and cap"

BP plans to send marine robots that will cut the "lower marine riser package,” or LMRP, on the well. This is a set of pipes that connect the oil well’s blowout preventer to the damaged pipe. After that, a diamond-cut saw will be used to make a "clean cut," preparing the way for a custom-made cap to be fitted over the package. One of a number of caps that BP has available, depending on the cut, will be placed over the package to bring the oil and gas to the surface.

The operation represents the first of three containment steps that BP plans to take. After the cap is on, a second operation will create a second flow through the blowout preventer, meaning there will be two channels of oil leaking to the surface.

When asked about his level of confidence in the capping procedure, given the fact that other operations aimed at stopping the spill have failed, BP Managing Director Bob Dudley said the company has learned a lot from previous attempts. For instance, warm water will be pumped down in an effort to combat the formation of hydrates, or crystals, that blocked a previous containment vessel.

While the engineering has never been attempted at a depth of 5,000 feet, Dudley said, it is "more straightforward" than that used in previous operations. The cap "should be able to capture most of the oil," Doug Suttles, chief operating officer of BP's global exploration and production business said. However, he cautioned that the new cap will not provide a "tight mechanical seal."

If successful, the procedure will allow BP to collect most, but not all, of the oil spewing from the well. The cutting that precedes the cap placement carries with it a risk of increasing the oil flow, Dudley acknowledged. But "even with increased flow rate, this cap will be able to handle this." However, the BP statement said, "systems such as the LMRP containment cap have never been deployed at these depths and conditions, and their efficiency and ability to contain the oil and gas cannot be assured."

BP's effort to slice off a damaged riser pipe stalled after the blade of a diamond wire saw got stuck June 2. The diamond wire cutter plan was dumped after the device got stuck midway through the pipe. It was freed and taken to the surface.

May 28, 2010
Solution: “Junk shot”
This method involves debris such as shredded tires, golf balls and similar objects being shot under extremely high pressure into the blowout preventer in an attempt to clog it and stop the leak. Engineers at BP used this technique along with the top kill.

What was expected
"Each of these [materials] has been proven to fill various-sized spaces in the blowout preventer until the flow is stopped," BP says in a statement on its website. "While there is no known perfect 'recipe,' a number of combinations of materials will be used." More drilling mud would follow the junk shot, with the hope that the two methods together would stop the oil long enough for cement to be poured into the well. BP’s Suttles compared the operation to stopping up a toilet.

Did it work?
This one failed, too. The process was carried out "a number of times" with the U.S. Coast Guard before the oil giant admitted that the experiment had failed, BP press officer Sheila Williams said. Engineers first used the junk shot to quell the 1991 Kuwait oil fires, but never at such depths. "I don't think we'll be using golf balls again," Williams said.

May 25, 2010
Solution: "Top kill"
The top kill involves pumping heavy drilling fluid into the head of the leaking well at the sea floor. The manufactured fluid, known as drilling mud, is normally used as a lubricant and counterweight in drilling operations. The hope is that the drilling mud will stop the flow of oil. Cement then would be pumped in to seal the well. The first round of pumping began May 26.

Top kill has worked on above-ground oil wells in the Middle East but has never been tested 5,000 feet underwater. BP Chief Executive Officer Tony Hayward has given the maneuver a 60 percent to 70 percent chance of success.

A team of experts will examine conditions inside the five-story blowout preventer to determine how much pressure the injected mud will have to overcome. The company then performs diagnostic tests to determine whether the procedure can proceed.

Three days of work involving three separate pumping efforts and 30,000 barrels of mud – along with what Hayward described as "16 different bridging material shots" – just didn't do the trick.

"We have not been able to stop the flow," a somber Suttles told reporters. " ... Repeated pumping, we don't believe, will achieve success, so we will move on to the next option." Suttles and other officials said that the top kill attempt to stop the flow did so – but only as long as they were pumping. When the pumping stopped, the oil resumed its escape.

May 14, 2010
Solution: Riser insertion tube
The riser insertion tube tool is a temporary solution that involves inserting a 4-inch-diameter tube into the Deepwater Horizon’s rise, a 21-inch diameter pipe, between the well and the broken end of the riser on the sea floor.

The insertion tube connects to a new riser to allow hydrocarbons to flow up to the Transocean Discoverer Enterprise drill ship. The oil will be separated and shipped ashore.

This seems to be the most successful effort thus far in containing some of the spill. The system was able to capture some of the leaking oil and pipe it aboard a drill ship, burning off some of the natural gas released in the process, according to a statement from the joint BP-Coast Guard command center leading the response to the oil spill.

The flow rate from the tube reached 3,000 barrels of crude (126,000 gallons) and 14 million cubic feet of gas a day as of May 20. BP’s Suttles said the company is "very pleased" with the performance of the tube. However, Gov. Bobby Jindal of Louisiana says the efforts haven't stopped oil from reaching his state's coastline.

May 12, 2010
Solution: Second containment dome or “top hat”
The "top-hat" cofferdam is a 5-foot-tall, 4-foot-diameter structure that weighs less than 2 tons and would be injected with alcohol to act as an antifreeze and keep its outlet clear.

BP built the smaller dome after the containment vessel, designed to cap the larger of two leaks in the well, developed glitches. The new device would keep most of the water out at the beginning of the capping process and allow engineers to pump in methanol to keep the hydrates from forming, BP's Suttles said. Methanol is a simple alcohol that can be used as an antifreeze.

BP abandoned the idea of using the “top hat” and opted to proceed with an insertion tube technique instead. It wasn’t clear why BP made that choice.

May 7, 2010
Solution: First containment dome
BP lowered a massive four-story containment vessel over the well to cap the larger of two leak points. The hope was that the container would collect the leaking oil, which would be sucked up to a drill ship on the surface.

"If all goes according to plan, we should begin the process of processing the fluid and stop the spilling to the sea," Suttles said. But the method had not been done at such depths before.

The plan was thwarted after ice-like hydrate crystals formed when gas combined with water to block the top of the dome and make it buoyant. The dome was moved off to the side of the wellhead and is resting on the sea floor, Suttles said. He declined to call it a failed operation but said, "What we attempted to do ... didn't work."

May 4, 2010
Solution: Drilling a relief well
The second well joins the failed well at the bottom, in rock 13,000 feet below the ocean. Once contact is made, drilling fluid and concrete will be put into the first well.

This will lower the pressure on the failed well, enough to allow a concrete plug to be placed into it and permanently shut it down. The relief well could also be used for future oil and gas production. BP began drilling the second well this month, but it will take three months to complete. Weather conditions could prolong the process, Beaudo said.

The well is expected to be completed by August. It would be a permanent solution to cap the leaking well.

End of April
Solution: Robots to shut blowout preventer
The rig’s blowout preventer, a 48-foot-tall, 450-ton apparatus that sits atop the well 5,000 feet underwater, failed to automatically cut off the oil flow after the April 20 explosion of the Deepwater Horizon rig. BP attempted to use remote-controlled submarines with robotic arms to reach access portals and activate the valve.

The highly complex task was to take 24 to 36 hours, said Doug Suttles, chief operating officer of BP's global exploration and production business.

Failed. "We've tried many different ways. Some things have showed promise; some haven't," BP spokesman Daren Beaudo said. "We don't know why the remote-operated shutdown systems haven't worked."

Testing on a capped oil well in the Gulf of Mexico continues for another day as the federal government says BP has addressed questions about a seep near the well. Retired Coast Guard Adm. Thad Allen, the federal government's response manager for the oil spill, says that a federal science team and BP representatives discussed the seep during a conference call, including the "possible observation of methane over the well."

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Filed under: BP • Gulf Coast Oil Spill
soundoff (303 Responses)
  1. Jeff Braun

    I've been watching the live video on and off for a couple of days now. With the new LMRC try, I find it curious that there seem to be a few bolts holding what's left of the riser to the top of the BOP. Do we not have tools that can unscrew those bolts and place a new mount on top? Not saying it would be easy to get those bolts off, and maybe they have concerns about the integrity of the metal at the top of the BOP connecting the two flanges together. But it seems to me that with all of the "great" brains behind the science, they knew about crystals when they lowered the 1st containment tower that they never thought to add a connection to pump in warm water in case they needed it?

    To me, it "feels" like the people coming up with ideas and when to try them are working their work-a-day 8 hour days instead of the 24/7 required. I'm no Rep or Dem supporter and Obama hasn't instilled in me any sense of urgency on his part. His couple hour tour on the beach isn't what's needed, instead it should have been a couple of days!

    June 2, 2010 at 12:08 am | Report abuse |
  2. TIm H


    June 2, 2010 at 12:18 am | Report abuse |
  3. Joel B.

    The video shows the three leaks coming from the busted pipe. All they had to do was clamp an open valve at the end of the pipe and use pipe clamps around the busted leaks where all the pressure would be diverted to the open valve and then close the valve after the leaks were sealed. But BP is only interested in drilling another well head to get the oil up to their drill ship. Which they obviously cannot handle a well this deep and will create another problem they cannot control. They should be fighting this problem on two fronts: 1. cap the busted pipe 2. Boom and skim the oil before it reaches the beaches. I see they are focusing on the pipe, but not capping it. I see booms going up along the coastline, but where are all the skimmers and the huge tankers? Instead they spray dispersants to keep the oil from reaching the surface, which defeats the purpose of gathering it with the booms and skimmers. I thought it was a bad idea to shoot heavy mud (junk shot) into the pipe, pictures of a water hose and a kid trying to stop it up with mud popped into my head. I also think it would be a waist of time trying to pump warm water down 5,000 feet, by the time it gets to the bottom it will be cold.

    June 2, 2010 at 12:21 am | Report abuse |
    • Adam Beckett

      Its about time someone said that. I just dont understand why they arent paying attention

      June 3, 2010 at 12:40 am | Report abuse |
  4. TIm H

    Sorry about the typing and the spelling......

    June 2, 2010 at 12:25 am | Report abuse |
  5. Dave

    The leak will be plugged on June 6...Its symbolic. For this and other esoteric knowledge visit my website.

    June 2, 2010 at 12:47 am | Report abuse |
  6. TIm H

    I am looking at the pipe flanges ..... How about bolting on/welding on an inverted metal funnel with "a valve " installed in it that could be shut off . That would secure the cap to the existing pipe allowing the ice hydrates to escape until the metal funnel is bolted down and permit the flow to be shut off or at least reduced. Shutting it down would be best ,however , being able to collect all of the oil by being able to tie in and open it up later would stop any further contamination......

    June 2, 2010 at 1:10 am | Report abuse |
  7. Mary J. Lipstraw

    There are alot of great ideas to check out regarding the oil spill. I also have a couple of ideas #1 Pump in hot lava – it's
    like fighting fire with fire in a way. #2 Pump in resin as fast as they can to fill all the spaces, put a steel covered top and
    watch it harden. You never know either one could work. GOOD LUCK!!! Mary J. Lipstraw

    June 2, 2010 at 1:54 am | Report abuse |
  8. Jeff H

    OK. This oil well is essentially a tiny straw hole that snakes its way down through over 2 miles of rock underneath the seabed to reach the oil reservoir. How hard could it be to collapse that straw? Let's drill a hole 1/4 mile deep that parallels the existing shaft. Put an explosive charge at the bottom of that new hole. Fill it with mud. Blow the charge. The lateral explosion collapses the tube and acts like a blowout preventer. The whole operation takes 2 weeks or less. This has to work better than the bone-headed plans I'm hearing from BP.

    June 2, 2010 at 2:44 am | Report abuse |
  9. Diamond P.

    The truth is that they can't cap it! Y'all will see. BP knows they can't cap it but they've been advised not to say so. They r just going through the motions.  I don't want to be pessimistic but everyone need to uncross their fingers and figure out how to clean this shyt up! We need to use independent researchers to measure the environmental effects of the oil. BP doesn't give a damn about us. They r trying to figure out how to mitigate their damages. They are more concerned with the legal ramifications and covering up. If I had a voice I would round all their asses up and say to hell with what y'all think and what y'all want to do. "We" the U.S, is running this show bcz we are the ones being affected! To hell with compensation protocol; You will write a check NOW to compensate every business effected, you will write a check NOW for immediate clean up efforts, you will write a check NOW to start implementing preventative measures. Hard heads make soft asses; I need to see soft asses!  

    June 2, 2010 at 6:07 am | Report abuse |
  10. Lloyd Sturge

    I think we need to think out of the box here. why can't BP go back to the next connection where all those bolts are, unscrew and remove the damaged pipe piece, and attach a valve to the riser and simply turn the valve off after it is attached? An open valve while being attached would relieve the pressure and let the gushing oil escape while being attached. Then simply turn it off.

    June 2, 2010 at 8:46 am | Report abuse |
    • Lloyd Sturge

      Why are they cutting??? There are bolts to remove. Nice clean attachment for virtually anything to be attached. Why cut?

      June 2, 2010 at 8:54 am | Report abuse |
  11. Lloyd Sturge

    I couldn't help but notice BP rep in the video saying "cap it and bring the oil and gas to the surface" What? Just cap the damn thing, stop the flow! Bring the oil and gas to the surface? This is not the time to think of resuming production and recovering losses with a pipe to the surface!

    June 2, 2010 at 9:01 am | Report abuse |
  12. R. Millhouse. N.

    ...BP drilling relief well to fix main well.... hmm...what are the odds that the relief well will get messed up and create ANOTHER leak. Y'know...if they can't get it right the first time..WHY give them the right to continue "working". If you have an associate that screws up SO BAD that it costs the company and environment BILLIONS...are you gonna keep them in the lineup to do it again?? Where's Donald Trump when you need him.... "HEY BP - YOU"RE FIRED!!!"

    June 2, 2010 at 9:06 am | Report abuse |
  13. RC Lewis

    Why not use the large claw to crush the pipe in a number of places? Crush and crimp the pipe to shut the flow off. BP has it's mind on collecting the oil and siphoning it instead of shutting this well down permanently. Why? For the Money, to protect their investors, shareholders, and their stock. They have to keep it flowing. Protect the coast line? No... protect the bottom line.

    June 2, 2010 at 9:32 am | Report abuse |
  14. David Hoo

    To dramatically speed up the relief well effort, why not do it at a much shallower depth, like 3,000 feet, in June instead of 18,000 feet in August.

    Either convert one of the two relief well efforts to this or start a third relief well drilling immediately!

    June 2, 2010 at 9:51 am | Report abuse |
    • Mike

      The pressue might be such that the hydrostatic head provided by the drilling mud might not be sufficient enough to overcome the head of the oil.

      June 2, 2010 at 10:06 am | Report abuse |
  15. Mike

    I read most of these "ideas" written on here and I would almost like BP to employ them just to watch them all fail. All these anologies to about stopping faucets or sprinklers or other laymens ideas share absolutely no parallel to the realites at 5000 ft down. A lot of the problem is reporting, which makes these things sound much simpler than they are. The pressure of the ocean down there is 2100 psi, meaning the oil pressure is even higher, some have said as many as 15,000 psi. There is a reason that the blowoff preveter weighs 450 tons. It really is not that simple. Have you seen the group of brains that Obama has gathered to consult with BP ? One has worked with NASA on ideas such as mining the surface on Mars. I'm an engineer and I have yet to really come up with any great idea or grand plan, and nearly every other engineer I work with has yet to dream up anything either. This is an incredibly challanging situation, and that reality is obviously lost on many of you.

    June 2, 2010 at 10:04 am | Report abuse |
    • Adam Beckett

      Is it possible to crane OFF the blow off preventor off the main bore at those depths? If so can a 450 ton cap shaped like a super size rivet with a tapering shaft be dropped in the main bore ? How on earth do you install a 450 ton device at those depths?


      June 3, 2010 at 12:45 am | Report abuse |
    • Jz

      You might need go back to school again and work hard.

      For one, the oil pressure can not be 15,000 psi. Because the difference 15,000-2,100 will be 12,900 psi will be shooting out like you never see before, NOT that slow, easy leaking you see. Do not forget when you cap something under that depth, the outside of a cap (or whatever) has the same 2,100psi pressure from the water.

      You need go to work for BP and the problem will be solved when the well run out of the oil. Call BP today to apply for a job.

      June 3, 2010 at 12:55 am | Report abuse |
    • Joe Architect

      Architects are great problem-solvers. I hope they've included one or two in their design solution team. I am encouraged to learn that they have a NASA engineer on board. This IS "rocket science."

      June 9, 2010 at 12:34 pm | Report abuse |
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