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Orimulsion is a registered trademark name for a bitumen-based fuel that was developed for industrial use by Intevep, the Research and Development Affiliate of Petroleos de Venezuela SA (PDVSA), following earlier collaboration on oil emulsions with BP.
Like coal and oil, bitumen occurs naturally and is obtained from the world's largest deposit in the Orinoco Belt in Venezuela. The deposit is estimated to be more than 1,300 billion barrels (190 billion m3) of bitumen, an amount approximately equivalent to the world's estimated proven oil reserves. [1] [2]
Raw bitumen has an extremely high viscosity and specific gravity between 8 and 10 API gravity at ambient temperatures, making it unsuitable for direct use in conventional power stations. Orimulsion is produced by mixing the bitumen with approximately 30% fresh water and a small amount of surfactant. The resulting mixture behaves similarly to fuel oil. Recently, an alcohol-based surfactant has replaced the original phenol-based version, improving the transport properties of the fuel and eliminating the health concerns associated with the phenol group of surfactants.
As a fuel for electricity generation, Orimulsion has a number of attractive characteristics:[ citation needed ]
While Orimulsion is little different to fuel oil in relation to environmental impacts when burnt, being similarly susceptible to pollution mitigation techniques, it is more problematic in spill situations. [3] If a spill occurs during shipping over water, the Orimulsion mixture de-emulsifies, causing the bitumen to separate and no longer remain in suspension.
Orimulsion is classified as a non-Newtonian fluid, and if its temperature drops below 30 °C, it undergoes a process referred to as 'setting'[ further explanation needed ]. Once set, it becomes extremely difficult to pump, and restarting operations or restoring the flow through the pipeline becomes impossible.
Orimulsion is currently used as a commercial boiler fuel in power plants worldwide, including countries such as Japan, Italy [4] and China. Its usage was previously more widespread, and there was an increasing demand for it. However, following the Venezuelan general strike of 2002–03, many engineers from PDVSA were dismissed. Since Orimulsion had been highly regarded by these engineers, it lost favor among key political leaders.[ dubious ] Consequently, the Venezuelan government has been attempting to gradually phase out the Orimulsion program, except for its sales to China. The Venezuelan government maintains close ties with China, similar to its relationship with Cuba. As a result, China continues to receive supplies of Orimulsion, while the rest of the world either had their supply terminated or is still in the process of winding down. Despite these developments, Orimulsion still holds great potential for domestic consumption.[ citation needed ]
Another reason given by current PDVSA management is that with rising crude oil prices, it has been found that mixing or diluting Orinoco bitumen (extra-heavy oil) with a lighter crude oil can make this blend more profitable as a crude oil on the world market than by selling it as Orimulsion. An example of this is the popular Merey blend (Orinoco bitumen and Mesa crude oil). ConocoPhillips along with PDVSA operate the Merey Sweeny 58,000-barrel-per-day (9,200 m3/d) (bpd) delayed coker, vacuum tower and related facilities at ConocoPhillips' refinery in Sweeny, Texas, U.S.A. for processing and upgrading heavy sour Merey crude oil. [5]
Air pollutant control technology that is commonly available can limit emissions from Orimulsion to levels considered "Best Available Control Technology", as defined by the United States Environmental Protection Agency. [6]
Bitumen is an immensely viscous constituent of petroleum. Depending on its exact composition it can be a sticky, black liquid or an apparently solid mass that behaves as a liquid over very large time scales. In the U.S., the material is commonly referred to as asphalt. Whether found in natural deposits or refined from petroleum, the substance is classed as a pitch. Prior to the 20th century the term asphaltum was in general use. The word derives from the ancient Greek ἄσφαλτος ásphaltos, which referred to natural bitumen or pitch. The largest natural deposit of bitumen in the world, estimated to contain 10 million tons, is the Pitch Lake of southwest Trinidad.
Oil sands, tar sands, crude bitumen, or bituminous sands, are a type of unconventional petroleum deposit. Oil sands are either loose sands or partially consolidated sandstone containing a naturally occurring mixture of sand, clay, and water, soaked with bitumen, a dense and extremely viscous form of petroleum.
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Petróleos de Venezuela, S.A. is the Venezuelan state-owned oil and natural gas company. It has activities in exploration, production, refining and exporting oil as well as exploration and production of natural gas. Since its founding on 1 January 1976, with the nationalization of the Venezuelan oil industry, PDVSA has dominated the oil industry of Venezuela, the world's fifth largest oil exporter.
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Bitumen-based fuel is fuel specifically developed for industrial use. Raw bitumen, processed from Bituminous rocks, has an extremely high viscosity.
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The proven oil reserves in Venezuela are recognized as the largest in the world, totaling 300 billion barrels (4.8×1010 m3) as of 1 January 2014. The 2019 edition of the BP Statistical Review of World Energy reports the total proved reserves of 303.3 billion barrels for Venezuela (slightly more than Saudi Arabia's 297.7 billion barrels).
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Emulsified Fuels are emulsions composed of water and a combustible liquid, either oil or a fuel. Emulsions are a particular example of a dispersion comprising a continuous and a dispersed phase. The most commonly used emulsion fuel is water-in-diesel emulsion. In the case of emulsions, both phases are the immiscible liquids, oil and water. Emulsion fuels can be either a microemulsion or an ordinary emulsion. The essential differences between the two are stability and particle size distribution. Microemulsions are isotropic whereas macroemulsions are prone to settling and changes in particle size over time. Both use surfactants and can be either water-in-oil, or oil-in-water or bicontinuous.
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