Introduction
The production of oil from most commercially viable reservoirs is generally described by three stages termed natural recovery, supplementary recovery and enhanced recovery processes. The recovery processes are used in consecutive order and the shift between methods is usually governed by whether the subsequent production method is economic or not. The production of oil has a very wide range of efficiency, described as the recovery factor (RF). No matter if any single recovery process is efficient or not, the three terms are used by convention from the initial planning stage. For instance, it is also worth noting the use of enhanced methods without the use of supplementary methods may well still improve the overall recovery
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However, it is analytically impossible to exactly simulate any given natural reservoir due to the number of parameters that occur in the model, along with the associated uncertainty of various parameters.
Displacement methods are not always efficient, when high volumes of injected fluid may only displace a relatively small fraction of hydrocarbons. In particular, the inefficient displacement of the waterflooding mechanism is often due to the unfavourable mobility ratio or reservoir heterogeneity. Research has established that the mobility of brine used in waterflooding is highly reduced by adding small amounts of hydrolysed polyacrylamide, a water-soluble polymer. The reduction in the brine mobility results in greater oil recovery when compared to the conventional water flooding technique [3][4][5].
Hence production plans increasingly include enhanced oil recovery (EOR) processes to mobilize oil in the reservoir rock.
1. Primary Oil Recovery
Primary oil recovery, also known as the natural reservoir drive mechanism, consists of different types of reservoir drive mechanisms which displace the oil towards the producing well or well bore. Generally there are six types of reservoir drive mechanism:
Rock and liquid expansion drive
Depletion drive
Gas cap
The technological advances in the field of enhanced oil recovery(EOR) such as Plasma Pulse Technique (PPT) , microbial injection and 〖CO〗_2-EOR process have not only allowed us to extract more oil with better efficiency but have also opened the door to unconventional petroleum sources such as coal bed methane, shale, gas hydrates etc. Recent oil discoveries have been made in unfamiliar locations
Oil is the product that each and every one of us use. It can be used for fuel, heating and even cooking. The most often known for unstable price is crude oil or gasoline. According to the The Economist, The main reason for price shifts of oil is oversupply. The oil production in Saudi rose 10.3 million barrels per day. This increase is the effect of a new method that I being applied to oil extraction. This method is called fracking, fracking is where they drill into tight-rock formations then gradually turning horizontal for several thousand feet more. This results to accommodations to multiple oil wells. This new approved method of oil harvesting has raised the productivity gains and reduced the cost of harvesting oil.
With the age of constant industrial and technological growth has come the necessity for not only cost effective and efficient methods for industry, but also the need for obtaining fuel for the machines that make the modern world possible. Oil has become as precious a commodity as gold, if not more so; its attainments constantly driving the world's largest businesses and governments across the world into action. Naturally, a "quick-fix" solution to this problem is constantly sought after by oil companies wishing to provide oil on a massive scale. One of these drilling methods is known as induced hydraulic fracturing (also known as fracking).
The process of making synthetic crude oil requires an enormous amount of water, especially in the separation process. Each barrel of oil requires two tons of oil sands and up to five barrels of hot water. Water is also needed along with electricity to convert it steam. The steam is pushed by steam injections making bitumen less viscous. It is quite evident that oil sands are not practical in terms of its process. Also three-quarters of the bitumen can be recovered from the sands, leaving behind 25% as waste. With the technology in our present society, oil sands are not entirely practical in terms of efficiency; however, in the future, this may change. To reflect, there are many disadvantages associated with oil sands, especially in the way it is processed.
Oil production is crucial for humans. Overall, 33 out of 48 countries have now hit a peak in oil production, resulting that oil is going to hit a decline in production. This peak is in countries such as Mexico and Russia, potentially signifying the end of the Industrial revolution. However, oil itself is not running out, just the rich, thick oils, that are high quality. In the near future, the only oil that Earth will have will be thin, and not good enough to use in motor vehicles or for electricity. Additionally, cheap and easy to extract oil will be at a decline, and also oil will be in unaccessible places, or within dangerous areas. Oil production needs to stay at pace with the human demand.
When a new oil field begins its production process, nature takes its course and does most of the work. The natural pressures from the reservoir force the oil into production
Canada’s oil sands are among the largest oil reserves in the word. This is evident from the fact that Canada is ranked third for the largest oil reserve in the world, after Venezuela and Saudi Arabia (“Oil Sands,” n.d.). “Oil sand”, is a naturally occurring mixture of sand, clay, water and bitumen (Gosselin et al., 2010). It is a very dense and extremely viscous oil that must be treated before it can be used to produce usable fuels such as gasoline and diesel (Gosselin et al., 2010). In North America, high oil prices, growing demand, and diminishing oil reserves results in greater interest to mine local oil reserves. Increased production of oil generates significant economic benefits but, at the same time, the development of the oil sands
They then pump fluid through pipelines into the drilled areas in order to extract materials that would further indicate the presence of oil. Once a company is certain that there is a sufficient amount of oil at a given location to make drilling worthwhile, it sets up a more permanent structure, or platform, from which to extract it. The oil that is pumped out is sent through pipelines back to shore. An offshore facility can pump oil from a field for decades.
Oil was discovered in this area in 1951, but the trick was extracting it. Then, not long ago, came a marriage of two techniques—one older, one newer. The older one was “hy - draulic fracturing,” or “fracking,” for short. This is the method by which oil or natural gas is forced from rock. The newer technique was horizontal
The Eagle Ford shale formation in south Texas has recently become the focus of many oil industry operators searching for new sources of hydrocarbons by using the latest technology in previously unexplored areas. This exploration enhances the development of even more advanced techniques as issues are identified and problems solved to address the unique properties of the formation and the surrounding surface environment. Even though a formation may be comprised of a single sedimentary layer from a similar geological time frame it is not a homogeneous block and has many features and anomalies that effect the pressure, permeability, type of hydrocarbons trapped and methods required to extract them. To understand these properties one must understand that shale is a fine-grained sedimentary rock that forms from the compaction of silt and clay placing it in the mudstone category of rocks [1]. Shale is different from other rocks in this category because it has a fissile structure and is laminated. The black shale in the Eagle Ford formation (Fig 1.) has a special property such that it contained organic material when it was deposited and during compaction over a millennium, the organic materials were converted into trapped oil and gas hydrocarbon deposits. This oil and gas are very difficult to remove because it is trapped within tiny pore spaces and or adsorbed onto clay mineral particles that makeup the shale.
The oil industry in the United States is booming. However, not all oil or natural gasses are available by drilling. There are some oils and gasses trapped inside shale rock. To access these gases, a process called Hydraulic Fracturing, informally known as fracking, was invented. Hydraulic Fracking “is a controversial oil and gas extraction technique developed in the late 1940s to gain access to fossil energy deposits previously inaccessible to drilling operations. The process…literally involves the smashing of rock with millions of gallons of water- along with sand and an undisclosed assortment of chemicals in order to bring gas to the surface. (serc-carelton.edu).” This process combines water, sand, and chemicals
Petroleum system processes include source rock, seal rock, reservoir rock as well as overburden rock. The processes inherent in petroleum system include the trap formation and the generation, migration and
The issue of whether offshore oil drilling is a safe operation or not has been arguing for a long time in the United States. ( SPE International, N.D.) Drilling on water started in early 1930s in Louisiana by shallow-draft barges. Nevertheless, the first oil well on water was drilled in 9th of September, 1947 by Kerr-McGee’s unit Tender Assist Drilling (TAD) in the Gulf of Mexico (SPE International, N.D.). A year after year, oil companies used more and more sophisticated equipment to drill on water, but the number of spilled accidents has been rising since 1964 (Ivanovich, and Hays, 2008). After all, while
When steam is injected to the formation a steam chamber around the well is created [3]. The pressure of the steam should be lower than the fracture pressure of the rock mass to prevent the deflection of the rock [4]. Steam injection will go on for months during which the steam chamber expands and the viscosity of the bitumen decreases. This will cause the bitumen to flow down under gravity towards the production well. The produced oil is then pumped to the surface. Surface facilities are then used to separate the water
This paper explains the idea behind the tertiary recovery method of heavy crude oil from a reservoir using the thermal recovery method of fire flooding (in situ combustion) and its processes of incorporating conditions of the crude. These heavy oils have high viscosity which requires more heat to and create less surface tension in order to allow for much better mobility. In order for this all to happen and it relies on the use of injected air and water while also utilizing those components to the advantage of thermal recovery to heat and vaporize oil and produce steam from water. This heated gas and vapor then provides a thermal push by combustion and pushing oil into the designated production well by methods of dry combustion (air injection, no water), wet combustion (air injection with water), and reverse combustion by means of injecting water and gas on opposite sides of the reservoir for the complete combustion of the whole reservoir.