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الإنجليزية) 3:
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Extraction of oilIn general, the first stage is digging a well in the crude oil extraction, oil depots, underground. Historically, there are some oil wells in America where the oil reached the surface in a natural way. However, most of these fields are implemented, except in some limited places in Alaska. Are often dug many wells for the same repository, for economic extraction rate. In some wells are pumping water, the steam, a mixture of different gases into the reservoir to maintain continued economic recovery rates.In the event that the pressure in the underground gas reservoir is sufficient, then it will force the oil out of the surface under the influence of this pressure. Gaseous fuels or natural gas are often found underground, increasing pressure. In this case, the pressure enough to put a number of valves on the well head to connect the well to a pipeline network for storage, and playback. This is called the initial oil extraction. Almost 20% only from the oil in the reservoir can be extracted in this way.During the life of the well under pressure, and when the specified limits is not enough to push the oil to the surface. Then, if the remaining in the well enough, economically, and often as well, the oil remaining in the well is extracted in an extracting additional oil. Different techniques are used in the method of extracting additional oil pressure in the oil recovery of reservoirs that do or say. Baltlmbat injection is sometimes used, such as continuous pumps, electric pump depths (electrical submersible pumps ESPs) to lift the oil to the surface.And using assistive technology to increase reservoir pressure by water injection, the injection of natural gas, gas lift, which is the injection of air, CO2, or other gases into the reservoir. Methods and work together and suspect the extracting additional oil, but after the confirmation of the feasibility of using this method is economically, and whether the oil output will cover the production costs and expected profits from the well.It is also based on oil prices at the time, where is the operation of wells that may have stopped working in the situation of high oil prices. Methods of extracting the oil thermally enhanced (Thermally. Enhanced oil recovery methods TEOR) is the third in the order of extracting the oil, and they rely on the heating of oil and to make it easy extraction.There are other technology and is burning in the - position, and in which oil is burned to heat the surrounding oil, detergent is sometimes used to reduce the density of oil. Approximately 5 to 15% and extraction of oil in this stage.
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