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Written by Administrator
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Tuesday, 17 November 2009 10:43 |
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A spiral air mover is an air powered venturi that alows all the waste to travel through the bore of the pump. The applications are varied from ventilation, cooling, rapid pumping of large volumes of foam and mud as in the application below for Oil Search Papua New Guinea with the Vacteck Vacuums SAM210.
Vacteck Spiral Air Mover (VACSAM)
Model bore sizes available against order;
38mm, 50mm, 75mm, 100mm, 150mm & 210mm.
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The VacSam unit consists of 4 components, (a) Suction Nozzle. (b) Compressed Air Entry, Manifold. (c) Venturi Air Jet.(this item is positioned within item (b). (d) Exhaust Nozzle.
The entire unit is of a parallel diameter and as such any product entering the suction nozzle will exit via the exhaust nozzle.
The compressed air entry manifold has an offset entry in order to create a style of centrifugal entry, thus allowing an even compressed air flow to the venturi air jet(c).
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The Venturi Air Jet has a series of specifically drilled/angled series of air jet holes in order to create a spiral/vortex air flow downstream, this spiral flow is similar to a cyclonic twister in that there is a point of vacuum created, this expands downstream, conveying incoming atmosphere (from the suction end) and the required medium to be conveyed, the bore diameter & compressed air energy are relevant to the product being conveyed in that if the medium is heavy, light, long items (e.g. tooth brushes) & of course the volume required to be moved. |
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It should be noted that a VacSam unit can be powered by compressed air, however Vacteck Vacuums have developed a Venturi Water Jet component part that will fit within the Compressed air entry manifold, by powering the Vacsam unit with high pressure water in order to move fluid the VacSam unit becomes more efficient.
The current unit purchased by Oilsearch is designed to consume 976 scfm at 100 psi and will produce an air flow of 9,760 scfm at a reduced air pressure.
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Oil Search requirements;
The first application is to install a device (e.g. venturi) in an approximatley 8.5" ID steel pipe (blooie line) up to approximately 200 feet in length for carrying stiff foam (see attached photos) containing rock sediments/sand to a disposal area next to an oil/gas drilling rig working at approximately 3000 ft elevation above sea level in Papua New Guinea. The foam is pumped/created using from 700 to 1200cfm air volume. The foam is pumped down 5.5" OD drill pipe at 100 to 200psi and returns to the surface outside the drill pipe carrying the drilled cuttings.
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The foam reaches the surface in the annulus between the outside of the 5.5" diameter drill pipe and the inside of a 30" OD x 28" ID steel riser, which is open to the atmosphere at the top. The 8.5" ID pipe is planned to be ported into the 28" ID riser approximately 6 feet below the top end of the 28" ID riser. The steel pipe is approximately horizontal, with very little drop angle. |
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The sediments in the foam vary in size, but most would be sand size or smaller, but perhaps 5% of the sediments could be up to an inch in diameter. Even larger cuttings may occassionally appear, but since they are rare, we feel we can ignore them for the moment and deal with them later if they indeed produce any problems. The foam is enviromentally approved and there are no hydrocarbons of any kind in the foam returns from the well. From a material balance stand-point, the foam would contain on average 0.2 lbs rock sediment (~2.65sg) per std cu ft of air/foam, but at times the concentration could be orders of magnitude higher or lower. |
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Last Updated on Wednesday, 27 October 2010 09:05 |
