Collecting Oil Leak Plumes with Sub Sea Tents

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While BP has tried to convince every one of its capability and competence to handle the crisis, we are now 36 days into the deep sea oil leak. Oil continues to gush out unabated from the damaged riser as can be seen here. Some of the problems which have been encountered in collecting the oil before it can cause environment damage have been:

  • Remoteness (the accident site is 50 miles offshore and 5,000 ft underwater)
  • Extreme pressure (150 atmospheres) and temperatures at the depth of leak causing engineering difficulty
  • Formation of Methane Hydrate (ice) crystals
  • Debris getting in the way of collection
  • Dispersion of oil before it can be collected at the ocean surface because of surface turbulence
Yet the solution seems pretty obvious to me. (1) We need a collection dome of the right size, (2) placed at the right area and depth, and (3) connected to the right collection device. While BP has seemingly got part three right, it is still struggling with parts one and two.

Townsend Solutions solves these problems using a collection dome that can be scaled to the required width and cross section area depending up on the size of spilled area. This "dome"--and it's called a tent, by the way--can be bought off-the-shelf and suitably modified for anchorage. This then inverted tent made of high performance fabric can be placed at a suitable depth that collects the oil below the "turbulent zone" but above the "Methane Hydrate" zone.

Because of its light weight the tent can be airlifted to the remote site and located right over the rising oil and gas plume. It can then be dropped to any desired depth by filling its anchoring cylinders at its edges with right amount and mix of seawater and air. It can then be fully extended to cover the entire area of the rising plume. Vertical and horizontal position in the water will be controlled with lines/hawsers and adjusting the buoyancy of seawater/air cylinders. (See picture below)

Phils Idea May 25.JPG

As a stratified plume of oil and gas bubble rises into the sections of the tent, it forms lighter gas/liquid phases in the peak of the tent which are collected along with a considerable volume of (contaminated) seawater by rigid pipes connected on top. After conventional separation of gas, liquid, and seawater phases on surface barge, we envision pumping seawater back down to the tent for recycling through the system.

An important design element is the need to minimize ocean pollution from the heavier and more damaging portions of the leak. Methane, Ethane, Propane and other hydrocarbons will invariably saturate surrounding seawater and be left behind in noticeable quantities. But heavier hydrocarbons are much less soluble in seawater and, therefore, a very large part the heavier hydrocarbons will be recovered by this system. Furthermore, crude oil will be concentrated in the down-current portion of the plume, so we expect 99% recovery of the crude portion of the leak. However, only tests will allow accurate estimation of the recovery for lighter fractions.

A famous quote from Sir Arthur Conan Doyle says "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."

My version of the same for BP would go something like "When you have tried the bold and the bountiful, whatever remains, however simple, must be the answer." Anyone listening...??



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About this Entry

This page contains a single entry by Phil Townsend published on May 25, 2010 3:07 PM.

EPIC FAIL: BP's Leadership Mess in the Gulf was the previous entry in this blog.

An Innovative Flexible Solution to BP's Rigidly Growing Problems is the next entry in this blog.

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