1. Field of the Invention
This invention relates to a system to contain and retrieve oil and gas from a deep water well that has developed uncontrollable discharge. Specifically, the invention describes a non-rigid containment and retrieval system stored surrounding the well on the ocean floor in such a manner that it does not interfere with drilling or production activities and that can be activated at the time of the well failure on demand for immediate protection of the environment from deep water discharged oil and gas.
2. Description of the Prior Art
In May 2010 there was a disastrous deepwater oil well failure in the Gulf of Mexico that caused great damage to the environment because of the sheer volume of discharged oil that could not be contained for several months. Because deep water oil and gas wells are submerged under water, often below 500 feet, the water pressure is so great that human beings cannot reach the depths to fix a broken well. There are thousands and thousands of deepwater oil wells throughout the world. Each deepwater oil well is a disaster waiting to happen, even if the well is no longer in service.
There are numerous devices and systems that have been described in the literature, including prior issued U.S. patents that deal with containment and retrieval of uncontrollably discharged oil and gas from deep water wells. One common problem with these systems is that the recovery systems are not stored at the well site or in position at the well before the oil well failure. Therefore, there is a significant amount of time required to install at the well site any one of these systems in order to start containing and retrieving discharged oil. Unfortunately, based on the discharge rates possible by broken oil wells, millions of gallons of polluting oil can have already been discharged before any of these systems could be realistically put in operating position. An example of a prior U.S. patent showing a system is U.S. Pat. No. 3,664,136, issued May 23, 1972. In this device, the containment devices installed are conical in shape and are used to contain and retrieve oil after the well has ruptured. There is no provision for storing this device permanently surrounding the oil well site on the bottom of the ocean for instant deployment. Another example of a prior U.S. Patent showing a system is U.S. Pat. No. 3,548,605 filed Dec. 22, 1970. In this device the system is a mobile apparatus adapted to be lowered to an underwater location. Although the device could be stored nearby, its design would not allow it to be stored surrounding the well in place and it would need to be moved into place when needed. It included a one piece fluid gathering funnel shaped collector and a canopy (discharge vent tube) in sections. This device may include a cover (dome) to collect gases. However this dome is of one solid piece and is positioned at the surface of the water, not at the bottom at the site of the leaking well. The discharge vent tube in this device is provided shape by rings as opposed to the air chambers in the instant device.
The Applicant's invention described herein will be installed at a well site surrounding the well before the well is damaged. The system can be deployed on demand on a moment's notice at the damaged oil well site on the bottom of the ocean at the time of the rupture remotely from the ocean surface from the oil rig itself. By having an on demand deployment, the oil spill rupture can be contained and retrieved virtually immediately, thus allowing the system to protect the environment against millions and millions of gallons of oil that could have been discharged while trying to bring in or position containment devices known in the prior art.
An underwater oil and gas containment and retrieval system comprising a collapsible deployable oil and gas containment canopy comprised of several non-rigid panels pulled together from the top to form a completed dome (1), an oil and gas discharge vent tube (2), dome panel storage containers (3) for storing the dome panels on the ocean floor, a discharge vent tube storage container (16) for storing the discharge vent tube separately on the ocean floor, a discharge vent tube float (4) and cable (17), a dome panel float (5) connected to a dome panel float cable system (9) a system deployment operating system that is remotely activated from above the water surface connected to the floats (4) and (5), and a plurality of anchors imbedded to the bottom of the ocean near the well to be protected. The system is especially useful for deep water wells below 500 feet deep.
The deployable canopy dome panels (1) are comprised of flexible non-rigid materials which, when pulled up from the top by cables (9) connected to the dome panel float (5) form a completed dome which is essentially sealed due to the overlap (13) of the dome panels (1), and which is used to trap oil or gas discharged from the well (11). The dome is used in conjunction with a collapsible discharge vent tube (2) connected at the very top of the dome and extendable up to the ocean surface for directing the contained oil and gas up to the surface of the ocean where it can be harvested by a recovery vessel. The dome is constructed of several individual flexible panels (1) made of non-rigid rubber-based material or synthetic fibers that can be folded and stored on the ocean floor in a large area comprising a circle around the outside area of the oil well. The size of the base of the dome is determined by the specifics of the oil rig and can be as large as a football field or even larger.
The dome is comprised of a plurality of flexible triangularly shaped dome panels (1) that have a larger base than length. The dome panels (1) are overlapped shown by dotted line (13) when deployed as a dome. The dome panels (1) can be folded up and stored on the ocean floor in sections inside the dome panel storage containers (3) in a circle outside the diameter of the well when the system is installed on the ocean floor and remain in storage like an air bag in a car until deployment because of a damaged and leaking well.
The oil recovery system includes a discharge vent tube (2) which functions like a pipe to direct discharged oil and gas from the top area of the dome upwardly to the surface of the ocean. Thus, the vent tube extends to the ocean surface, once deployed with the dome system. The discharge vent tube (2) is flexible for storage purposes and made of a non-rigid material identical to that used for the dome panels. The discharge vent tube, when deployed, has its base connected to the top of the dome ring (6) by the discharge vent tube bottom ring (7).
On deployment the discharge vent tube (2) is initially activated by opening the discharge vent tube storage container (16) and inflating the discharge vent tube float (4) by remote control from the surface. The discharge vent tube float (4) brings the top of the discharge vent tube to the surface. When fully deployed the bottom of the discharge vent tube (2) will be suspended above the ocean floor at approximately the height of the fully deployed dome. The dome ring (6) is drawn up to meet the discharge vent tube bottom ring (7) by the discharge vent tube cables (18) and cable winches (19) drawing up the dome ring connecting cables (18) which are attached to the dome ring. Since the water depth of the well is known, the discharge vent tube (2) can be preconstructed to a specific length before installation.
In order for the non-rigid discharge vent tube (2) to maintain the shape of a tube after deployment, the fabric of the tube will be formed into air chambers (14), similar to the air chambers in a swimming pool float, which will be inflated by gases after deployment to provide some rigidity and shape for the discharge vent tube.
The dome panels (1) are deployed after the discharge vent tube (2) is fully deployed and the dome ring (6) is drawn up by cables (5) to connect to the discharge vent tube bottom ring (7) by inflating the dome panel float (5) which is also stored on the ocean floor. The dome panel float (5) is connected to the dome panel float cable system (9) which is attached to the dome panels (1) as stored and folded up on the ocean floor. When the dome panels are deployed by the dome panel float (5) and dome panel cable system (9), the dome panel sections (1) are pulled upwardly by the dome panel float cable system (9) attached to the dome panel float (5). The dome panel float cables (9) each has a separate cable connected to the top of each dome panel. When the dome panel floats (5) are each inflated remotely by gases and floats upward, the dome panel floats (5) pull each of the cables (9) and all the individual panels (1) up from the canopy storage units to form an essentially sealed dome. The individual cables (9) are pulled through the dome ring cable guides (20) so that the dome panels (1) are pulled up tight against the dome ring (6) to form the completed dome. The panels are triangular sheets of flexible material which are folded for storage on the ocean floor inside the dome panel storage containers (3) similar to the way sails on a sailboat are folded when not in use. Each panel (1) is positioned to overlap dotted line (13) the adjoining panel along each side sufficiently to eliminate leakage or diminish leakage from the dome of the oil trapped therein. The upward force of the float to rise, plus the upward pressure of the contained oil and/or gas on the inside of the dome, will press the sides of the flaps together to form a closed barrier. Additional side edge fasteners such as hook and pile fasteners known under the trademark VELCRO can be used on the inside of each of the flaps to provide a better seal, if necessary.
The device uses the upward pressure of the dome panel floats (5) plus the upward pressure of the escaping oil and gas discharged (11) to keep the dome panels (1) properly deployed. The dome panel anchor system comprising cables (8) and winches with reels (15) allow for distributing the entire recovery dome centered over the well and high enough above the sea floor, if necessary, to diminish oil pressure inside the dome. The cables, winches and reels (15) which are connected to the dome panel anchor system (12) can be remotely operated from the surface to reel in or reel out the dome panel anchor cables (8) connected to the bottom of the dome panels (1) to keep the bottom of the dome panels (1) at the proper height above the sea floor. Oil and gas are lighter than seawater and inclined to float to the surface of the ocean. The bottom portion of the dome will contain seawater. The dome is lifted by the dome panel float (5) from the seafloor allowing the pressure under the dome to be controlled.
The system deployment activating equipment is positioned on the ocean floor adjacent to the stored discharge vent tube storage container. The system can receive RF signals from a remote location above the water such as a floating oil rig that will cause the oil recovery system to be deployed. The activating equipment may include a radio controlled device which is used to inflate the floats with gases when the device receives a remote signal from the ocean surface.
Because there will be forces from undersea currents as well as upward pressure from the discharged oil and gas (11) that act on the dome panels (1) when containing oil and gas that has been discharged from a ruptured oil well, it is essential that the entire system, which is stored underwater at the oil well site, be securely anchored to the ocean floor. Various anchor systems can be used depending on the circumstances. For example, in a sandy bottom an auger or corkscrew type anchor system may be adequate. For a solid sea floor a plurality of anchor pilings may be used.
It is an object of this invention to provide a non-rigid underwater oil and gas containment and retrieval system that is stored on the ocean floor in close proximity to and surrounding the oil well drilling or production operations in such a manner as to not interfere with drilling or production activities but to be in place so that it may be activated on a moment's notice in the event of a catastrophic leak.
It is another object of this invention to provide a non-rigid discharge vent tube (2) which can be folded and stored separately on the sea floor outside the dome panel storage containers in such a manner as to not interfere with drilling or production activities but to be in place so that it may be activated on a moment's notice in the event of a catastrophic leak.
It is another object of this invention to provide a system for connecting the discharge vent tube (2) to the top of the containment and retrieval system dome to provide a means for the discharged gas and oil (11) to be directed to the surface for harvesting and to prevent damage to the environment from the leak.
It is another object of this invention to provide a means to provide some rigidity to the discharge vent tube (2) after deployment through the use of air chambers (14) inflated by gases so that the discharge vent tube (2) retains its shape while in use.
It is another object of this invention to provide an underwater oil and gas retrieval system that can be activated remotely from the surface on a moment's notice when a catastrophic leak occurs without the necessity of first moving the device or other equipment.
In
Referring now to
In
The bottom edges of the dome panels (1) that form the dome are connected to reels and winches 15 by cables (8) that can raise or lower the distance of the panels (1) to the ocean floor after deployment.
Referring now to
Referring now to
1. The oil containment system will be stored in place on the sea floor surrounding the capped well shaft (10) but located far enough away from the well so as not to interfere with the well cap. It will remain in place until needed as shown in
2. Once it is determined that the leak is significant enough to require deployment of the system, a worker in a ship on the surface will send a remote RF signal to begin deployment (
3. The discharge vent tube storage container (16)
4. When the discharge vent tube (2) is fully deployed, a RF signal will be sent from the surface to inflate the discharge vent tube air chambers (14), using gas cartridges (21) attached to the inside of each chamber, to provide some rigidity and shape to the discharge vent tube (2).
5. When the discharge vent tube (2) is fully deployed the discharge vent tube bottom ring (7) will be suspended above the sea floor at about the height of the fully deployed dome. A remote RF signal will be sent from the surface to activate the discharge vent tube cable winches and reel (19), thereby drawing the dome ring (6) up to connect to the discharge vent tube bottom ring (7).
6. The dome panel storage containers (3), which overlap and are connected together to form a complete circle when stored in place on the sea floor, will be opened at the same time the discharge vent tube storage container (16) is opened
7. The dome panel float (5) will be inflated remotely and will float up bringing the dome panels (1) up tight against the dome ring using the dome panel float cables (9) which are connected to the top of the dome panels. The dome panels (1) are designed to overlap when fully deployed to minimize leakage through the panels. In instances where significant pressures are anticipated, hook and pile fasteners known under the trademark VELCRO may be used at the overlapped sides dotted lines (13) to further minimize leakage.
8. The bottom of the dome can be raised or lowered as necessary to the proper depth to capture the maximum amount of oil and gas and control pressures inside the dome by utilizing the dome panel anchor cables (8) in conjunction with the dome panel anchor system winches and reels (15)
9. The recovery ship will connect to the top of the discharge vent tube (2) to recover the oil and gas as gas and oil come to the surface.
10. Operation on operating wells will be the same as for non-operating wells except that the discharge piping connected to the surface will need to be removed before deploying the device.
The following is a list of parts and elements used in the specification and drawings:
The instant invention has been shown and described herein in what is considered to be the most practical and preferred embodiment. The applicant recognizes, however, that departures may be made therefrom within the scope of the invention and that obvious modifications will occur to a person skilled in the art.
This application is a continuation-in-part of co-pending U.S. patent application Ser. No. 13/040,708, filed Mar. 4, 2011.
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3500841 | Logan | Mar 1970 | A |
3548605 | Paull et al. | Dec 1970 | A |
3561220 | Riester | Feb 1971 | A |
3610194 | Siegel | Oct 1971 | A |
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3681923 | Hyde | Aug 1972 | A |
3724662 | Ortiz | Apr 1973 | A |
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3824942 | Stafford et al. | Jul 1974 | A |
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4405258 | O'Rourke et al. | Sep 1983 | A |
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8173012 | Che | May 2012 | B1 |
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Number | Date | Country | |
---|---|---|---|
Parent | 13040708 | Mar 2011 | US |
Child | 13348853 | US |