Stop the Gulf oil spill with heavy, streamlined objects

By Louis A. Bloomfield, Ph.D.

Professor Physics, University of Virginia

The ongoing oil spill in the Gulf of Mexico is primarily a physics problem and, as such, should be susceptible to a physics solution.  But two of the simplest physics solutions — sealing the top of the well with the blowout preventer’s hydraulic valves and pumping dense liquid drilling mud down the well hole (the “top kill”) — were both tried and  failed for technical reasons.  Propelled upward by a pressure in excess of 108 pascals (about 1, 000 atmospheres) at the bottom of the 18,000-foot well hole, the oil has resisted efforts to stop its flow from the top.  All hopes have now turned to the relief wells, which won’t be ready for the “bottom kill” (pumping dense drilling mud up the leaking well hole) for at least another month.  Bad weather or bad luck could further prolong the spill.

My suggestion is to focus not on the top of the well, but on the bottom of the well.  I propose to stop the flow of oil by filling the well hole from the bottom up with dense, streamlined objects that are capable of descending into the uprushing stream of oil by gravity alone.  An object that has a downward terminal velocity in the oil that is greater than the oil’s upward flow velocity will gradually descend to the bottom of the well. If those objects are dropped one after the next into the top of the well, the well will slowly fill up with them. They may hover in the oil initially, levitated by upward drag forces, but they’ll eventually collapse into a dense heap that is several miles deep. When they do, they will form the coarse equivalent of a “packed powder,” and the oil will have to traverse all the nooks and crannies in that powder to reach to top of the well. Given the viscous drag forces acting on the oil as it flows through the “powder,”  the oil’s flow will be extremely slow.

Assuming the most pessimistic estimates for the leak rate (60,000 barrels per day) and the narrowest diameter of the casing near the bottom of the well hole (7 in or 17.8 cm), the upward velocity of the oil is likely to average at most 4.5 m/s (about 15 ft/s).  Assuming that upward flow velocity, streamlined iron objects or rods less than 2 or 3 cm (about 1 in) in diameter should be able to make it to the bottom of the well.  Objects made of lead or still denser metals should easily reach the bottom of the well.

The bottom of the well is porous rock rather than a vast underground cavern,  so the objects will accumulate after descending through the oil.  Eventually,  several million kilograms of objects will fill the well hole and reduce the oil flow to a trickle, in spite of the roughly 1000 atm pressure drop between the bottom and top of the well.  It may be helpful to include deformable objects,  ones that can form particularly narrow channels for the oil or even true seals within the heap.  It may also be valuable to include sharp, hardened steel or tungsten carbide objects that can grip the metal casings of the well hole and help prevent the oil from lifting the heap upward.

A video of this idea appears at:

and a manuscript detailing this idea appears on the Physics ArXiv: http://arxiv.org/abs/1006.0656.  I believe that the physics of my suggestion is sound, but recognize that technical issues (e.g., the presence of drilling pipe in the well, limited access to the well top, lips on the well casing segments and drill-pipe couplers) might prevent it from working properly in the actual well.  Nonetheless, even a partial implementation of my idea in the upper half or third of the well hole might produce a significant reduction in the oil leak rate.

I hope that, in addition to commenting on the viability of my suggestion, you will propose physics suggestions of your own.  As a community, we can provide a valuable resource to the public and society by offering carefully considered suggestions to this and other important problems of the day.

4 Comments

  1. JWolf
    Posted September 2, 2010 at 1:08 PM | Permalink | Reply

    a very nice physics demonstration on the video. It might have been better to also show the movement of the objects with moving oil instead of static oil. One could set up a either a continuous flow or, in a closed area, set up a system where the objects can be dropped while the oil is spurting up…..

  2. Posted July 21, 2010 at 9:13 AM | Permalink | Reply

    I like your idea, It is for sure sound in theory. I have spoken with several people in various fields about the same thing, they probably read this site first.

    The problem that might be encountered with this method is that there are casing sections jammed into the BOP stack, and probably inside the bore as well.Like a high speed train derailing in a tunnel, casing sections were wedged into the stack, there were multiple HT/HP problems with this well going back to Feb.,that’s why the last 500′ were “open-hole ” ie: no casing. It is my thoughts that they have had several explosive events at various sections of the bore, given that binary fluids in a column will reach a point of being static under their own load, this load is what is fighting bottomhole pressures. I realize that I do not have a firm grasp on the tech behind all of this, but I am not stupid either. I have a photo of a casing section laying on the seafloor next to the well….It couldn’t have gotten there until after they sheared the kinked riser pipe off, it wouldn’t have made it out of the well-bore.

    I have a fair amount of geo-data from the OCS and the Mississippi Canyon area..and the initial application to drill…let’s just say…they lied through their teeth to get approved….no H2S producing microbial communities my *ss..

    The analysis of the reservoir given to me says otherwise..for example

    .435%/wt.

    Anyways, great site, keep looking forward for solutions.

    Isaac

  3. Lawrence Baker
    Posted July 5, 2010 at 9:21 AM | Permalink | Reply

    Dr. Bloomfield: Excellent job!

    Now, if we could fire (oil appointed) Dr. Chu and appoint you to head the Department of Energy; we could positively address the stop the oil flow issue with science.

    I also maintain that the out of control oil well is not that big of a physics problem and I have also offered a positive physical solution.

    I like your idea much better though because your idea is much easier and simple. Simple, in the way of brilliance!!!

  4. petrovic zoran
    Posted July 5, 2010 at 9:18 AM | Permalink | Reply

    Is it possible to freeze the tube bellow and then to work on it, like they do so on the ground with the NL2 ?

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