Underground Fluid Mechanics
Пособие разработано в соответствии с программой дисциплины и ФГОС ВО Федеральным государственным образовательным стандартом высшего образования; представляет курс лекций, в котором дается освещение теории фильтрации нефти, газа, воды и их смесей в поровых и трещиноватых пластах, плоской фильтрации, неустановившейся фильтрации, фильтрации многофазных систем в подземных коллекторах, моделей вытеснения несмешивающихся жидкостей.Предназначено для студентов, обучающихся по направлению подготовки 21.03.01. - Нефтегазовое дело.
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I UNDERGROUND FLUID MECHANICS Bulk volume measurements. Bulk volume measurements are classified into two types: linear measurement and displacement methods. Linear measurement is simply physically measuring the sample with a vernier caliper and then applying the appropriate geometric formula. This method is quick and easy, but is subject to human error and measurement error i f the sample is irregularly shaped. Displacement methods rely on measuring either volumetrically or gravimetrically the fluid displaced by the sample. Gravimetric methods observe the loss in weight o f the sample when immersed in a fluid, or observe the change in weight of a pycnometer filled with mercury and with mercury and the sample. Volumetric methods measure the change in volume when the sample is immersed in fluid. For all displacement methods, the fluid is prevented from penetrating into the pore space by coating the rock surface with paraffin, saturating the rock with the same fluid, or using mercury as the displacing fluid. Pore Volume Measurements. Several methods have been developed to measure the pore volume of a sample. The original mercury injection methods such as Washburn-Bunting and Kobe are obsolete and seldom used. Their elimination was due to the destructive nature o f mercury and the lack of accurate results. A second method is called the fluid resaturation method. A clean and dried sample is weighted, saturated with a liquid of known density, and then reweighed. The weight change divided by the density of the fluid results in the pore volume. This technique also yields effective porosity; however, complete saturation is seldom obtained and therefore porosity is commonly lower than that determined from the Boyle's Law method. Furthermore, i f the sample is water sensitive then oil should be used as the saturating fluid. The procedure is slow, however numerous samples can be run simultaneously. Alongside with full porosity a concept of dynamic porosity is frequently ...
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