The use of equations known in filtering theory to determine parameters of fluid motion through filters of various designs used in the oil industry to clean up the products from mechanical impurities is described. Analytical studies and calculations have been carried out to determine the speed of fluid motion in filters of frame-bar, ringed, perforating types, as well as through the packing of gravel filters. The selection of new boundary conditions simplifies the solution of the resulting differential equations; and the increase in the calculated parameters by 5-10% (Hou method) eliminates the probability of error. Thus, the obtained values of the filtering parameters allow to correctly choose the size and geometry of the filter elements.
The main mechanism of oil displacement is characterized by gradual vertical movement of oil-water contact with insulation of watering out intervals in production wells. Different compositions on the basis of hydrochloric acid are traditionally used as working fluids to increase the formation pressure. The use of mud acid representing the mix of hydrochloric and fluoric acids gives the maximum effect.
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