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EN
A perspective way of oil wells operation is to use sucker rod pumps, in combination with oil-gas jet pumps. Placing a jet pump above the dynamic level in the well and operating it simultaneously with the sucker rod pumps allows to stabilize the work of the rod pump, avoid fluctuations of the dynamic level and facilitate the rise of the production liquid to the surface due to the reduction of the density of the mixed flow after the jet pump. In order to implement such oil-gas jet pump in oil wells that are operated by sucker rod pumps, it is necessary to determine their operating modes and choose the most effective among them. A methodology for calculating the operation mode of such well was created that allows determining the efficient location of jet pumps in oil wells and their geometry. When developing this methodology two conditions were taken as a main aim: the whole amount of free gas, which enters the casing annulus of the well, must pass through the oil-gas jet pump and to reach the maximum possible decreasing of the string load. For the 753-D oil well in Dolyna Oil Field calculated efficient operation mode shows the possibility to decrease string load by 26%, reduce electricity consumption and, respectively, investments in oil extraction.
EN
The most efficient apparatus are known to be heat exchangers with classic countercurrent flow of heat carriers. However, this current scheme is rarely possible to create in an apparatus. In many cases cross flow heat exchangers are more acceptable in terms of efficiency of heat emission from the outer surface of the wall. Therefore cross flow if used which is within the identical surface area and heat-transfer rate in disadvantage in comparison with the classic countercurrent scheme. In this case multiple passes mixed diagram are mainly used where with sufficient number of cross flow passes reciprocal flow of heat carriers is close to the classic countercurrent. The most widespread assembling design of heat exchangers is complex and mixed current design. Unlike the simple mixed design one of the heat carriers moves as split flow lines through the full length and it does not interfuse between the passes and a heat carrier, which is inside as a rule within one pass and flows as split flow lines and it interfuses between the passes. In such a way the design of the mixed flow will be complex where every pass (section) is a complex cross flow diagram. Heat exchangers that are under analysis are widely spread in the different fields of the economy. That is why receiving more accurate and perfect methods and techniques of their research and analysis is an urgent task.
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